diff --git a/src/lib/utils/contest.ts b/src/lib/utils/contest.ts
index 74319b8e1..01f4fc6ee 100644
--- a/src/lib/utils/contest.ts
+++ b/src/lib/utils/contest.ts
@@ -193,6 +193,7 @@ const atCoderUniversityPrefixes = getContestPrefixes(ATCODER_UNIVERSITIES);
  */
 const ATCODER_OTHERS: ContestPrefix = {
   chokudai_S: 'Chokudai SpeedRun',
+  atc001: 'AtCoder Typical Contest 001',
   'code-festival-2014-quala': 'Code Festival 2014 予選 A',
   'code-festival-2014-qualb': 'Code Festival 2014 予選 B',
   'code-festival-2014-final': 'Code Festival 2014 決勝',
@@ -313,16 +314,18 @@ export function getContestPriority(contestId: string): number {
  * - "abc376"
  * - "ARC128"
  * - "agc045"
+ * - "atc001"
  * - "awc0001"
  *
  * Example non-matches:
  * - "xyz123"
  * - "abc12"
  * - "abc1234"
+ * - "atc1234"
  * - "awc12345"
  */
-const regexForAxc = /^(abc|arc|agc)(\d{3})/i;
-const regexForAwc = /^(awc)(\d{4})/i;
+const regexForAxc = /^(abc|arc|agc|atc)(\d{3})$/i;
+const regexForAwc = /^(awc)(\d{4})$/i;
 
 /**
  * Regular expression to match AtCoder University contest identifiers.
diff --git a/src/test/lib/utils/test_cases/contest_name_labels.ts b/src/test/lib/utils/test_cases/contest_name_labels.ts
index 89a6d32d4..6abe638ba 100644
--- a/src/test/lib/utils/test_cases/contest_name_labels.ts
+++ b/src/test/lib/utils/test_cases/contest_name_labels.ts
@@ -37,6 +37,10 @@ export const atCoderOthers = [
     contestId: 'chokudai_S002',
     expected: 'Chokudai SpeedRun 002',
   }),
+  createTestCaseForContestNameLabel('AtCoder Typical Contest 001')({
+    contestId: 'atc001',
+    expected: 'ATC 001',
+  }),
 ];
 
 export const mathAndAlgorithm = [
diff --git a/src/test/lib/utils/test_cases/contest_type.ts b/src/test/lib/utils/test_cases/contest_type.ts
index d5b628350..53283c55c 100644
--- a/src/test/lib/utils/test_cases/contest_type.ts
+++ b/src/test/lib/utils/test_cases/contest_type.ts
@@ -398,6 +398,10 @@ export const atCoderOthers = [
     contestId: 'chokudai_S002',
     expected: ContestType.OTHERS,
   }),
+  createTestCaseForContestType('AtCoder Typical Contest 001')({
+    contestId: 'atc001',
+    expected: ContestType.OTHERS,
+  }),
   createTestCaseForContestType('CODE FESTIVAL 2014 qual A')({
     contestId: 'code-festival-2014-quala',
     expected: ContestType.OTHERS,