diff --git a/packages/middleware-retry/src/retryDecider.ts b/packages/middleware-retry/src/retryDecider.ts
index 221ef3d27607..2d8e7b9fc390 100644
--- a/packages/middleware-retry/src/retryDecider.ts
+++ b/packages/middleware-retry/src/retryDecider.ts
@@ -1,7 +1,6 @@
 import { RETRYABLE_STATUS_CODES } from "./constants";
 import {
   isClockSkewError,
-  isStillProcessingError,
   isThrottlingError
 } from "@aws-sdk/service-error-classification";
 import { MetadataBearer, SdkError } from "@aws-sdk/types";
@@ -23,11 +22,7 @@ export const defaultRetryDecider = (error: SdkError) => {
     return true;
   }
 
-  return (
-    isStillProcessingError(error) ||
-    isThrottlingError(error) ||
-    isClockSkewError(error)
-  );
+  return isThrottlingError(error) || isClockSkewError(error);
 };
 
 function hasMetadata(error: any): error is MetadataBearer {
diff --git a/packages/service-error-classification/src/constants.ts b/packages/service-error-classification/src/constants.ts
index c7f91e394a36..755f54be5172 100644
--- a/packages/service-error-classification/src/constants.ts
+++ b/packages/service-error-classification/src/constants.ts
@@ -14,25 +14,24 @@ export const CLOCK_SKEW_ERROR_CODES = [
   "SignatureDoesNotMatch"
 ];
 
-/**
- * Errors encountered when the state presumed by an operation is not yet ready.
- */
-export const STILL_PROCESSING_ERROR_CODES = ["PriorRequestNotComplete"];
-
 /**
  * Errors that indicate the SDK is being throttled.
  *
  * These errors are always retryable.
  */
 export const THROTTLING_ERROR_CODES = [
-  "BandwidthLimitExceeded",
+  "Throttling",
+  "ThrottlingException",
+  "ThrottledException",
+  "RequestThrottledException",
+  "TooManyRequestsException",
   "ProvisionedThroughputExceededException",
+  "TransactionInProgressException",
   "RequestLimitExceeded",
+  "BandwidthLimitExceeded",
+  "LimitExceededException",
   "RequestThrottled",
-  "RequestThrottledException",
   "SlowDown",
-  "ThrottledException",
-  "Throttling",
-  "ThrottlingException",
-  "TooManyRequestsException"
+  "PriorRequestNotComplete",
+  "EC2ThrottledException"
 ];
diff --git a/packages/service-error-classification/src/index.spec.ts b/packages/service-error-classification/src/index.spec.ts
index 636392936ec5..5a75c0fd3633 100644
--- a/packages/service-error-classification/src/index.spec.ts
+++ b/packages/service-error-classification/src/index.spec.ts
@@ -1,13 +1,5 @@
-import {
-  CLOCK_SKEW_ERROR_CODES,
-  STILL_PROCESSING_ERROR_CODES,
-  THROTTLING_ERROR_CODES
-} from "./constants";
-import {
-  isClockSkewError,
-  isStillProcessingError,
-  isThrottlingError
-} from "./index";
+import { CLOCK_SKEW_ERROR_CODES, THROTTLING_ERROR_CODES } from "./constants";
+import { isClockSkewError, isThrottlingError } from "./index";
 
 const checkForErrorType = (
   isErrorTypeFunc: (error: Error) => boolean,
@@ -37,24 +29,6 @@ describe("isClockSkewError", () => {
   }
 });
 
-describe("isStillProcessingError", () => {
-  STILL_PROCESSING_ERROR_CODES.forEach(name => {
-    it(`should declare error with the name "${name}" to be a StillProcessing error`, () => {
-      checkForErrorType(isStillProcessingError, name, true);
-    });
-  });
-
-  while (true) {
-    const name = Math.random().toString(36).substring(2);
-    if (!STILL_PROCESSING_ERROR_CODES.includes(name)) {
-      it(`should not declare error with the name "${name}" to be a StillProcessing error`, () => {
-        checkForErrorType(isStillProcessingError, name, false);
-      });
-      break;
-    }
-  }
-});
-
 describe("isThrottlingError", () => {
   THROTTLING_ERROR_CODES.forEach(name => {
     it(`should declare error with the name "${name}" to be a Throttling error`, () => {
diff --git a/packages/service-error-classification/src/index.ts b/packages/service-error-classification/src/index.ts
index 4a2125a76509..558ea92c589b 100644
--- a/packages/service-error-classification/src/index.ts
+++ b/packages/service-error-classification/src/index.ts
@@ -1,14 +1,7 @@
-import {
-  CLOCK_SKEW_ERROR_CODES,
-  STILL_PROCESSING_ERROR_CODES,
-  THROTTLING_ERROR_CODES
-} from "./constants";
+import { CLOCK_SKEW_ERROR_CODES, THROTTLING_ERROR_CODES } from "./constants";
 
 export const isClockSkewError = (error: Error) =>
   CLOCK_SKEW_ERROR_CODES.includes(error.name);
 
-export const isStillProcessingError = (error: Error) =>
-  STILL_PROCESSING_ERROR_CODES.includes(error.name);
-
 export const isThrottlingError = (error: Error) =>
   THROTTLING_ERROR_CODES.includes(error.name);