diff --git a/contracts/exchange/test/internal.ts b/contracts/exchange/test/internal.ts
index b7cb059693..8357233f8c 100644
--- a/contracts/exchange/test/internal.ts
+++ b/contracts/exchange/test/internal.ts
@@ -81,55 +81,22 @@ blockchainTests('Exchange core internal functions', env => {
     let makerAddressLeft: string;
     let makerAddressRight: string;
 
-    function createMatchedFillResultsFromFilled(
-        leftMakerAssetFilledAmount: BigNumber,
-        leftTakerAssetFilledAmount: BigNumber,
-        rightMakerAssetFilledAmount: BigNumber,
-        rightTakerAssetFilledAmount: BigNumber,
-    ): MatchedFillResults {
-        return {
-            ...EMPTY_MATCHED_FILL_RESULTS,
-            left: {
-                ...EMPTY_FILL_RESULTS,
-                makerAssetFilledAmount: leftMakerAssetFilledAmount,
-                takerAssetFilledAmount: leftTakerAssetFilledAmount,
-            },
-            right: {
-                ...EMPTY_FILL_RESULTS,
-                makerAssetFilledAmount: rightMakerAssetFilledAmount,
-                takerAssetFilledAmount: rightTakerAssetFilledAmount,
-            },
-        };
+    interface PartialMatchedFillResults {
+        left: Partial<FillResults>;
+        right: Partial<FillResults>;
+        profitInLeftMakerAsset?: BigNumber;
+        profitInRightMakerAsset?: BigNumber;
     }
 
-    function createMatchedFillResults(
-        leftMakerAssetFilledAmount: BigNumber,
-        leftTakerAssetFilledAmount: BigNumber,
-        leftMakerFeePaid: BigNumber,
-        leftTakerFeePaid: BigNumber,
-        rightMakerAssetFilledAmount: BigNumber,
-        rightTakerAssetFilledAmount: BigNumber,
-        rightMakerFeePaid: BigNumber,
-        rightTakerFeePaid: BigNumber,
-        profitInLeftMakerAsset?: BigNumber,
-        profitInRightMakerAsset?: BigNumber,
-    ): MatchedFillResults {
-        return {
-            left: {
-                makerAssetFilledAmount: leftMakerAssetFilledAmount,
-                takerAssetFilledAmount: leftTakerAssetFilledAmount,
-                makerFeePaid: leftMakerFeePaid,
-                takerFeePaid: leftTakerFeePaid,
-            },
-            right: {
-                makerAssetFilledAmount: rightMakerAssetFilledAmount,
-                takerAssetFilledAmount: rightTakerAssetFilledAmount,
-                makerFeePaid: rightMakerFeePaid,
-                takerFeePaid: rightTakerFeePaid,
-            },
-            profitInLeftMakerAsset: profitInLeftMakerAsset || constants.ZERO_AMOUNT,
-            profitInRightMakerAsset: profitInRightMakerAsset || constants.ZERO_AMOUNT,
-        };
+    function createMatchedFillResults(partialMatchedFillResults: PartialMatchedFillResults): MatchedFillResults {
+        const matchedFillResults = EMPTY_MATCHED_FILL_RESULTS;
+        matchedFillResults.left = _.assign({}, EMPTY_FILL_RESULTS, partialMatchedFillResults.left);
+        matchedFillResults.right = _.assign({}, EMPTY_FILL_RESULTS, partialMatchedFillResults.right);
+        matchedFillResults.profitInLeftMakerAsset =
+            partialMatchedFillResults.profitInLeftMakerAsset || constants.ZERO_AMOUNT;
+        matchedFillResults.profitInRightMakerAsset =
+            partialMatchedFillResults.profitInRightMakerAsset || constants.ZERO_AMOUNT;
+        return matchedFillResults;
     }
 
     before(async () => {
@@ -284,12 +251,16 @@ blockchainTests('Exchange core internal functions', env => {
         // Note: This call would never be able to be made through our contracts, since these orders will not actually be
         // fully filled. This is just a test case to make sure.
         it('should correctly update the fillResults with nonzero input', async () => {
-            const expectedMatchedFillResults = createMatchedFillResultsFromFilled(
-                Web3Wrapper.toBaseUnitAmount(17, 0),
-                Web3Wrapper.toBaseUnitAmount(98, 0),
-                Web3Wrapper.toBaseUnitAmount(75, 0),
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(17, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(98, 0),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                },
+            });
             await assertCalculateCompleteFillBothAsync(
                 expectedMatchedFillResults,
                 new BigNumber(17),
@@ -300,12 +271,16 @@ blockchainTests('Exchange core internal functions', env => {
         });
 
         it('should correctly update the fillResults with nonzero input', async () => {
-            const expectedMatchedFillResults = createMatchedFillResultsFromFilled(
-                Web3Wrapper.toBaseUnitAmount(5, 0),
-                Web3Wrapper.toBaseUnitAmount(10, 0),
-                Web3Wrapper.toBaseUnitAmount(10, 0),
-                Web3Wrapper.toBaseUnitAmount(5, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 0),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 0),
+                },
+            });
             await assertCalculateCompleteFillBothAsync(
                 expectedMatchedFillResults,
                 new BigNumber(5),
@@ -316,12 +291,16 @@ blockchainTests('Exchange core internal functions', env => {
         });
 
         it('should correctly update the fillResults with nonzero input', async () => {
-            const expectedMatchedFillResults = createMatchedFillResultsFromFilled(
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                },
+            });
             await assertCalculateCompleteFillBothAsync(
                 expectedMatchedFillResults,
                 Web3Wrapper.toBaseUnitAmount(5, 18),
@@ -332,12 +311,16 @@ blockchainTests('Exchange core internal functions', env => {
         });
 
         it('should correctly update the fillResults with nonzero input', async () => {
-            const expectedMatchedFillResults = createMatchedFillResultsFromFilled(
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(2, 18),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(2, 18),
+                },
+            });
             await assertCalculateCompleteFillBothAsync(
                 expectedMatchedFillResults,
                 Web3Wrapper.toBaseUnitAmount(5, 18),
@@ -400,12 +383,16 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(17, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(98, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResultsFromFilled(
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-                Web3Wrapper.toBaseUnitAmount(75, 0),
-                Web3Wrapper.toBaseUnitAmount(75, 0),
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                },
+            });
             await assertCalculateCompleteRightFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -419,12 +406,16 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(12, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(97, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResultsFromFilled(
-                Web3Wrapper.toBaseUnitAmount(11, 0),
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(1, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(11, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
+                },
+            });
             await assertCalculateCompleteRightFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -438,12 +429,16 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(50, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(100, 18),
             });
-            const expectedMatchedFillResults = createMatchedFillResultsFromFilled(
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(2, 18),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(2, 18),
+                },
+            });
             await assertCalculateCompleteRightFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -725,16 +720,20 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-                Web3Wrapper.toBaseUnitAmount(75, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('76.4705882352941176'), 16),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('76.5306122448979591'), 16),
-                Web3Wrapper.toBaseUnitAmount(75, 0),
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('76.4705882352941176'), 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('76.5306122448979591'), 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -753,17 +752,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(97, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(14, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(15, 0),
-                Web3Wrapper.toBaseUnitAmount(90, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(90, 0),
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('92.7835051546391752'), 16), // 92.85%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('92.8571428571428571'), 16), // 92.85%
-                Web3Wrapper.toBaseUnitAmount(2, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(15, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(90, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(90, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('92.7835051546391752'), 16), // 92.85%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('92.8571428571428571'), 16), // 92.85%
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(2, 0),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -784,17 +787,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(83, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(49, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(16, 0),
-                Web3Wrapper.toBaseUnitAmount(22, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(22, 0),
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('26.5060240963855421'), 16), // 26.506%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('26.5306122448979591'), 16), // 26.531%
-                Web3Wrapper.toBaseUnitAmount(3, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(16, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(22, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(22, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('26.5060240963855421'), 16), // 26.506%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('26.5306122448979591'), 16), // 26.531%
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(3, 0),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -815,17 +822,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(11, 0),
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('91.6666666666666666'), 16), // 91.6%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('91.7525773195876288'), 16), // 91.75%
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(1, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(11, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('91.6666666666666666'), 16), // 91.6%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('91.7525773195876288'), 16), // 91.75%
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(10, 0),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -848,17 +859,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerFee: Web3Wrapper.toBaseUnitAmount(10000, 0),
                 takerFee: Web3Wrapper.toBaseUnitAmount(10000, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(16, 0),
-                Web3Wrapper.toBaseUnitAmount(22, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(22, 0),
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-                Web3Wrapper.toBaseUnitAmount(2650, 0),
-                Web3Wrapper.toBaseUnitAmount(2653, 0),
-                Web3Wrapper.toBaseUnitAmount(3, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(16, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(22, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(22, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(2650, 0),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(2653, 0),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(3, 0),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -882,17 +897,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(11, 0),
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(9166, 0),
-                Web3Wrapper.toBaseUnitAmount(9175, 0),
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(1, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(11, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(9166, 0),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(9175, 0),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(10, 0),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -913,17 +932,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(2126, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(1063, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(1000, 0),
-                Web3Wrapper.toBaseUnitAmount(1005, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(1005, 0),
-                Web3Wrapper.toBaseUnitAmount(503, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('47.2718720602069614'), 16), // 47.27%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('47.3189087488240827'), 16), // 47.31%
-                Web3Wrapper.toBaseUnitAmount(497, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1000, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1005, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1005, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(503, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('47.2718720602069614'), 16), // 47.27%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('47.3189087488240827'), 16), // 47.31%
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(497, 0),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -942,17 +965,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(2, 18),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(2, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(3, 18),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(2, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(3, 18),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -971,16 +998,20 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -999,17 +1030,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(20, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(4, 18),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(2, 18),
-                Web3Wrapper.toBaseUnitAmount(50, 16),
-                Web3Wrapper.toBaseUnitAmount(50, 16),
-                Web3Wrapper.toBaseUnitAmount(3, 18),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(2, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(50, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(50, 16),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(3, 18),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1028,17 +1063,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(2, 18),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(2, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(3, 18),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(10, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(10, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(2, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(3, 18),
+            });
             await assertCalculateMatchedFillResultsAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1290,16 +1329,20 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-                Web3Wrapper.toBaseUnitAmount(75, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('76.4705882352941176'), 16), // 76.47%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('76.5306122448979591'), 16), // 76.53%
-                Web3Wrapper.toBaseUnitAmount(75, 0),
-                Web3Wrapper.toBaseUnitAmount(13, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('76.4705882352941176'), 16), // 76.47%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('76.5306122448979591'), 16), // 76.53%
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(75, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(13, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1320,18 +1363,22 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(196, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(28, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(15, 0),
-                Web3Wrapper.toBaseUnitAmount(90, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(105, 0),
-                Web3Wrapper.toBaseUnitAmount(15, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('53.5714285714285714'), 16), // 53.57%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('53.5714285714285714'), 16), // 53.57%
-                constants.ZERO_AMOUNT,
-                Web3Wrapper.toBaseUnitAmount(15, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(15, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(90, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(105, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(15, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('53.5714285714285714'), 16), // 53.57%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('53.5714285714285714'), 16), // 53.57%
+                },
+                profitInLeftMakerAsset: constants.ZERO_AMOUNT,
+                profitInRightMakerAsset: Web3Wrapper.toBaseUnitAmount(15, 0),
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1352,18 +1399,22 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(87, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(48, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(16, 0),
-                Web3Wrapper.toBaseUnitAmount(22, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(29, 0),
-                Web3Wrapper.toBaseUnitAmount(16, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('33.3333333333333333'), 16), // 33.33%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('33.3333333333333333'), 16), // 33.33%
-                constants.ZERO_AMOUNT,
-                Web3Wrapper.toBaseUnitAmount(7, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(16, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(22, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(29, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(16, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('33.3333333333333333'), 16), // 33.33%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('33.3333333333333333'), 16), // 33.33%
+                },
+                profitInLeftMakerAsset: constants.ZERO_AMOUNT,
+                profitInRightMakerAsset: Web3Wrapper.toBaseUnitAmount(7, 0),
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1384,18 +1435,22 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(8, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(6, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(7, 0),
-                Web3Wrapper.toBaseUnitAmount(4, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(8, 0),
-                Web3Wrapper.toBaseUnitAmount(6, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(1, 0),
-                Web3Wrapper.toBaseUnitAmount(4, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(7, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(4, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(8, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(6, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(1, 0),
+                profitInRightMakerAsset: Web3Wrapper.toBaseUnitAmount(4, 0),
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1416,17 +1471,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(11, 0),
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('91.6666666666666666'), 16), // 91.6%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('91.7525773195876288'), 16), // 91.75%
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(1, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(11, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('91.6666666666666666'), 16), // 91.6%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('91.7525773195876288'), 16), // 91.75%
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(10, 0),
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1449,18 +1508,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerFee: Web3Wrapper.toBaseUnitAmount(10000, 0),
                 takerFee: Web3Wrapper.toBaseUnitAmount(10000, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(16, 0),
-                Web3Wrapper.toBaseUnitAmount(22, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(29, 0),
-                Web3Wrapper.toBaseUnitAmount(16, 0),
-                Web3Wrapper.toBaseUnitAmount(3333, 0),
-                Web3Wrapper.toBaseUnitAmount(3333, 0),
-                constants.ZERO_AMOUNT,
-                Web3Wrapper.toBaseUnitAmount(7, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(16, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(22, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(29, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(16, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(3333, 0),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(3333, 0),
+                },
+                profitInRightMakerAsset: Web3Wrapper.toBaseUnitAmount(7, 0),
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1483,17 +1545,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(11, 0),
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(9166, 0),
-                Web3Wrapper.toBaseUnitAmount(9175, 0),
-                Web3Wrapper.toBaseUnitAmount(89, 0),
-                Web3Wrapper.toBaseUnitAmount(1, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(11, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(9166, 0),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(9175, 0),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(89, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                profitInLeftMakerAsset: Web3Wrapper.toBaseUnitAmount(10, 0),
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1531,16 +1597,20 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(100, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(50, 18),
             });
-            const expectedMatchedFillResults2 = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(45, 18),
-                Web3Wrapper.toBaseUnitAmount(90, 18),
-                Web3Wrapper.toBaseUnitAmount(90, 16),
-                Web3Wrapper.toBaseUnitAmount(90, 16),
-                Web3Wrapper.toBaseUnitAmount(90, 18),
-                Web3Wrapper.toBaseUnitAmount(45, 18),
-                Web3Wrapper.toBaseUnitAmount(90, 16),
-                Web3Wrapper.toBaseUnitAmount(90, 16),
-            );
+            const expectedMatchedFillResults2 = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(45, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(90, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(90, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(90, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(90, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(45, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(90, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(90, 16),
+                },
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults2,
                 leftOrder,
@@ -1561,18 +1631,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(2126, 0),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(1063, 0),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(1000, 0),
-                Web3Wrapper.toBaseUnitAmount(1005, 0),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(2000, 0),
-                Web3Wrapper.toBaseUnitAmount(1000, 0),
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('94.0733772342427093'), 16), // 94.07%
-                Web3Wrapper.toBaseUnitAmount(new BigNumber('94.0733772342427093'), 16), // 94.07%
-                constants.ZERO_AMOUNT,
-                Web3Wrapper.toBaseUnitAmount(995, 0),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1000, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1005, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(2000, 0),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(1000, 0),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('94.0733772342427093'), 16), // 94.07%
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(new BigNumber('94.0733772342427093'), 16), // 94.07%
+                },
+                profitInRightMakerAsset: Web3Wrapper.toBaseUnitAmount(995, 0),
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1591,16 +1664,20 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1620,18 +1697,21 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(50, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(100, 18),
             });
-            const expectedMatchedFillResults = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(2, 18),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(100, 16),
-                Web3Wrapper.toBaseUnitAmount(5, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 18),
-                Web3Wrapper.toBaseUnitAmount(10, 16),
-                Web3Wrapper.toBaseUnitAmount(10, 16),
-                constants.ZERO_AMOUNT,
-                Web3Wrapper.toBaseUnitAmount(3, 18),
-            );
+            const expectedMatchedFillResults = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(2, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(100, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(5, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(10, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(10, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(10, 16),
+                },
+                profitInRightMakerAsset: Web3Wrapper.toBaseUnitAmount(3, 18),
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults,
                 leftOrder,
@@ -1647,16 +1727,20 @@ blockchainTests('Exchange core internal functions', env => {
                 makerAssetAmount: Web3Wrapper.toBaseUnitAmount(100, 18),
                 takerAssetAmount: Web3Wrapper.toBaseUnitAmount(50, 18),
             });
-            const expectedMatchedFillResults2 = createMatchedFillResults(
-                Web3Wrapper.toBaseUnitAmount(90, 18),
-                Web3Wrapper.toBaseUnitAmount(45, 18),
-                Web3Wrapper.toBaseUnitAmount(90, 16),
-                Web3Wrapper.toBaseUnitAmount(90, 16),
-                Web3Wrapper.toBaseUnitAmount(45, 18),
-                Web3Wrapper.toBaseUnitAmount(90, 18),
-                Web3Wrapper.toBaseUnitAmount(90, 16),
-                Web3Wrapper.toBaseUnitAmount(90, 16),
-            );
+            const expectedMatchedFillResults2 = createMatchedFillResults({
+                left: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(90, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(45, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(90, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(90, 16),
+                },
+                right: {
+                    makerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(45, 18),
+                    takerAssetFilledAmount: Web3Wrapper.toBaseUnitAmount(90, 18),
+                    makerFeePaid: Web3Wrapper.toBaseUnitAmount(90, 16),
+                    takerFeePaid: Web3Wrapper.toBaseUnitAmount(90, 16),
+                },
+            });
             await assertCalculateMatchedFillResultsWithMaximalFillAsync(
                 expectedMatchedFillResults2,
                 leftOrder2,