diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 734204008d..dbe95d84ef 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1 +1 @@
-* @driessamyn @jasonbyrner3 @dimosr @ronanbrowne @rick-r3 @simon-johnson-r3 @blsemo @Omar-awad @aditisdesai @vinir3 @vkolomeyko @thiagoviana @Sakpal
+* @corda/corda-platform-network-team
diff --git a/ledger/ledger-utxo/src/main/java/net/corda/v5/ledger/utxo/StateRef.java b/ledger/ledger-utxo/src/main/java/net/corda/v5/ledger/utxo/StateRef.java
index e3a94ff57d..6132454d12 100644
--- a/ledger/ledger-utxo/src/main/java/net/corda/v5/ledger/utxo/StateRef.java
+++ b/ledger/ledger-utxo/src/main/java/net/corda/v5/ledger/utxo/StateRef.java
@@ -6,7 +6,6 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.text.MessageFormat;
 import java.util.Objects;
 
 /**
@@ -72,7 +71,8 @@ public static StateRef parse(@NotNull final String value, DigestService digestSe
         final int lastIndexOfDelimiter = value.lastIndexOf(DELIMITER);
         if (lastIndexOfDelimiter == -1) {
             throw new IllegalArgumentException(
-                    MessageFormat.format("Failed to parse a StateRef from the specified value. At least one delimiter ({0}) is expected in value: {1}.", DELIMITER, value)
+                    "Failed to parse a StateRef from the specified value. At least one delimiter (" + DELIMITER + ") " +
+                            "is expected in value: " + value + "."
             );
         }
 
@@ -84,12 +84,12 @@ public static StateRef parse(@NotNull final String value, DigestService digestSe
             return new StateRef(transactionId, index);
         } catch (NumberFormatException numberFormatException) {
             throw new IllegalArgumentException(
-                    MessageFormat.format("Failed to parse a StateRef from the specified value. The index is malformed: {0}.", value),
+                    "Failed to parse a StateRef from the specified value. The index is malformed: " + value + ".",
                     numberFormatException
             );
         } catch (IllegalArgumentException illegalArgumentException) {
             throw new IllegalArgumentException(
-                    MessageFormat.format("Failed to parse a StateRef from the specified value. The transaction ID is malformed: {0}.", value),
+                    "Failed to parse a StateRef from the specified value. The transaction ID is malformed: " + value + ".",
                     illegalArgumentException
             );
         }
@@ -126,6 +126,6 @@ public int hashCode() {
      */
     @Override
     public String toString() {
-        return MessageFormat.format("{0}{1}{2}", transactionId, DELIMITER, index);
+        return transactionId + DELIMITER + index;
     }
 }
diff --git a/ledger/ledger-utxo/src/test/java/net/corda/v5/ledger/utxo/StateRefParseTest.java b/ledger/ledger-utxo/src/test/java/net/corda/v5/ledger/utxo/StateRefParseTest.java
index 91219d60b7..ef5272b191 100644
--- a/ledger/ledger-utxo/src/test/java/net/corda/v5/ledger/utxo/StateRefParseTest.java
+++ b/ledger/ledger-utxo/src/test/java/net/corda/v5/ledger/utxo/StateRefParseTest.java
@@ -2,9 +2,14 @@
 
 import net.corda.v5.application.crypto.DigestService;
 import net.corda.v5.crypto.SecureHash;
-import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
 
+import java.util.stream.Stream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.doThrow;
@@ -26,21 +31,21 @@ void parseValidValue() {
 
         final StateRef stateRef = new StateRef(secureHash, Integer.parseUnsignedInt(value.substring(lastIndexOfDelimiter + 1)));
 
-        Assertions.assertEquals(StateRef.parse(value, digestService).getTransactionId().toString(), stateRef.getTransactionId().toString());
+        assertEquals(StateRef.parse(value, digestService).getTransactionId().toString(), stateRef.getTransactionId().toString());
     }
 
     @Test
     void parseMalformedWithZeroDelimiter() {
         final String value = "XXX";
         final String errorMessage = assertThrows(IllegalArgumentException.class, () -> StateRef.parse(value, digestService)).getMessage();
-        Assertions.assertEquals(String.format("Failed to parse a StateRef from the specified value. At least one delimiter (%s) is expected in value: %s.", DELIMITER, value), errorMessage);
+        assertEquals(String.format("Failed to parse a StateRef from the specified value. At least one delimiter (%s) is expected in value: %s.", DELIMITER, value), errorMessage);
     }
 
     @Test
     void parseMalformedIndex() {
         final String value = ":asdf:a";
         final String errorMessage = assertThrows(IllegalArgumentException.class, () -> StateRef.parse(value, digestService)).getMessage();
-        Assertions.assertEquals(String.format("Failed to parse a StateRef from the specified value. The index is malformed: %s.", value), errorMessage);
+        assertEquals(String.format("Failed to parse a StateRef from the specified value. The index is malformed: %s.", value), errorMessage);
     }
 
     @Test
@@ -57,6 +62,31 @@ void parseMalformedTransactionId() {
 
         final String errorMessage = assertThrows(IllegalArgumentException.class, () -> StateRef.parse(value, digestService)).getMessage();
 
-        Assertions.assertEquals(String.format("Failed to parse a StateRef from the specified value. The transaction ID is malformed: %s.", value), errorMessage);
+        assertEquals(String.format("Failed to parse a StateRef from the specified value. The transaction ID is malformed: %s.", value), errorMessage);
+    }
+
+    @ParameterizedTest(name = "Parse large state ref index and reparse into state ref {0}")
+    @MethodSource("stateRefIndexes")
+    void parseLargeValueAndReparse(int index) {
+        final String value = "SHA-256D:ED87C7285E1E34BF5E46302086F76317ACE9B17AEF7BD086EE09A5ACBD17CEA4:" + index;
+        final int lastIndexOfDelimiter = value.lastIndexOf(DELIMITER);
+        final String subStringBeforeDelimiter = value.substring(0, lastIndexOfDelimiter);
+        final SecureHash secureHash = mock(SecureHash.class);
+
+        doReturn(secureHash).when(digestService).parseSecureHash(subStringBeforeDelimiter);
+        doReturn(subStringBeforeDelimiter).when(secureHash).toString();
+
+        final StateRef stateRef = StateRef.parse(value, digestService);
+
+        assertEquals(stateRef, StateRef.parse(stateRef.toString(), digestService));
+    }
+
+    public static Stream<Arguments> stateRefIndexes() {
+        return Stream.of(
+                Arguments.of(1000),
+                Arguments.of(1001),
+                Arguments.of(99999999),
+                Arguments.of(Integer.MAX_VALUE)
+        );
     }
 }