diff --git a/apps/api/src/instrument-records/instrument-records.service.ts b/apps/api/src/instrument-records/instrument-records.service.ts
index 2017e3dd1..3c415247e 100644
--- a/apps/api/src/instrument-records/instrument-records.service.ts
+++ b/apps/api/src/instrument-records/instrument-records.service.ts
@@ -38,6 +38,14 @@ type ExpandDataType =
       success: false;
     };
 
+function afterFirstDollar(str: string) {
+  if (!str) return str;
+  const match = /\$(.*)/.exec(str);
+  if (!match) return str;
+  if (!match[1]) return str;
+  return match[1];
+}
+
 @Injectable()
 export class InstrumentRecordsService {
   constructor(
@@ -180,7 +188,7 @@ export class InstrumentRecordsService {
             sessionId: record.session.id,
             sessionType: record.session.type,
             subjectAge: record.subject.dateOfBirth ? yearsPassed(record.subject.dateOfBirth) : null,
-            subjectId: record.subject.id,
+            subjectId: afterFirstDollar(record.subject.id),
             subjectSex: record.subject.sex,
             timestamp: record.date.toISOString(),
             value: measureValue
@@ -203,7 +211,7 @@ export class InstrumentRecordsService {
               sessionId: record.session.id,
               sessionType: record.session.type,
               subjectAge: record.subject.dateOfBirth ? yearsPassed(record.subject.dateOfBirth) : null,
-              subjectId: record.subject.id,
+              subjectId: afterFirstDollar(record.subject.id),
               subjectSex: record.subject.sex,
               timestamp: record.date.toISOString(),
               value: arrayEntry.measureValue
diff --git a/apps/web/src/hooks/__tests__/useInstrumentVisualization.test.ts b/apps/web/src/hooks/__tests__/useInstrumentVisualization.test.ts
index 52a6ed7f5..c86bf8190 100644
--- a/apps/web/src/hooks/__tests__/useInstrumentVisualization.test.ts
+++ b/apps/web/src/hooks/__tests__/useInstrumentVisualization.test.ts
@@ -72,7 +72,9 @@ describe('useInstrumentVisualization', () => {
       const [filename, getContentFn] = mockDownloadFn.mock.calls[0] ?? [];
       expect(filename).toContain('.csv');
       const csvContents = getContentFn();
-      expect(csvContents).toMatch(`subjectId,Date,someValue\r\ntestId,${toBasicISOString(FIXED_TEST_DATE)},abc`);
+      expect(csvContents).toMatch(
+        `GroupID,subjectId,Date,someValue\r\ntestGroupId,testId,${toBasicISOString(FIXED_TEST_DATE)},abc`
+      );
     });
   });
   describe('TSV', () => {
@@ -85,7 +87,9 @@ describe('useInstrumentVisualization', () => {
       const [filename, getContentFn] = mockDownloadFn.mock.calls[0] ?? [];
       expect(filename).toContain('.tsv');
       const tsvContents = getContentFn();
-      expect(tsvContents).toMatch(`subjectId\tDate\tsomeValue\r\ntestId\t${toBasicISOString(FIXED_TEST_DATE)}\tabc`);
+      expect(tsvContents).toMatch(
+        `GroupID\tsubjectId\tDate\tsomeValue\r\ntestGroupId\ttestId\t${toBasicISOString(FIXED_TEST_DATE)}\tabc`
+      );
     });
   });
   describe('CSV Long', () => {
@@ -100,7 +104,7 @@ describe('useInstrumentVisualization', () => {
       expect(filename).toContain('.csv');
       const csvLongContents = getContentFn();
       expect(csvLongContents).toMatch(
-        `Date,SubjectID,Value,Variable\r\n${toBasicISOString(FIXED_TEST_DATE)},testId,abc,someValue`
+        `GroupID,Date,SubjectID,Value,Variable\r\ntestGroupId,${toBasicISOString(FIXED_TEST_DATE)},testId,abc,someValue`
       );
     });
   });
@@ -116,7 +120,7 @@ describe('useInstrumentVisualization', () => {
       expect(filename).toMatch('.tsv');
       const tsvLongContents = getContentFn();
       expect(tsvLongContents).toMatch(
-        `Date\tSubjectID\tValue\tVariable\r\n${toBasicISOString(FIXED_TEST_DATE)}\ttestId\tabc\tsomeValue`
+        `GroupID\tDate\tSubjectID\tValue\tVariable\r\ntestGroupId\t${toBasicISOString(FIXED_TEST_DATE)}\ttestId\tabc\tsomeValue`
       );
     });
   });
diff --git a/apps/web/src/hooks/useInstrumentVisualization.ts b/apps/web/src/hooks/useInstrumentVisualization.ts
index d59d5f4c2..097606668 100644
--- a/apps/web/src/hooks/useInstrumentVisualization.ts
+++ b/apps/web/src/hooks/useInstrumentVisualization.ts
@@ -36,6 +36,14 @@ export function useInstrumentVisualization({ params }: UseInstrumentVisualizatio
   const [minDate, setMinDate] = useState<Date | null>(null);
   const [instrumentId, setInstrumentId] = useState<null | string>(null);
 
+  function afterFirstDollar(str: string) {
+    if (!str) return str;
+    const match = /\$(.*)/.exec(str);
+    if (!match) return str;
+    if (!match[1]) return str;
+    return match[1];
+  }
+
   const instrument = useInstrument(instrumentId) as AnyUnilingualScalarInstrument;
 
   const instrumentInfoQuery = useInstrumentInfoQuery({
@@ -70,7 +78,10 @@ export function useInstrumentVisualization({ params }: UseInstrumentVisualizatio
     const makeWideRows = () => {
       const columnNames = Object.keys(exportRecords[0]!);
       return exportRecords.map((item) => {
-        const obj: { [key: string]: any } = { subjectId: params.subjectId };
+        const obj: { [key: string]: any } = {
+          GroupID: currentGroup ? currentGroup.id : 'root',
+          subjectId: afterFirstDollar(params.subjectId)
+        };
         for (const key of columnNames) {
           const val = item[key];
           if (key === '__date__') {
@@ -99,8 +110,10 @@ export function useInstrumentVisualization({ params }: UseInstrumentVisualizatio
             objVal.forEach((arrayItem) => {
               Object.entries(arrayItem as object).forEach(([arrKey, arrItem]) => {
                 longRecord.push({
+                  GroupID: currentGroup ? currentGroup.id : 'root',
+                  // eslint-disable-next-line perfectionist/sort-objects
                   Date: toBasicISOString(date),
-                  SubjectID: params.subjectId,
+                  SubjectID: afterFirstDollar(params.subjectId),
                   Variable: `${objKey}-${arrKey}`,
                   // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment, perfectionist/sort-objects
                   Value: arrItem
@@ -109,8 +122,10 @@ export function useInstrumentVisualization({ params }: UseInstrumentVisualizatio
             });
           } else {
             longRecord.push({
+              GroupID: currentGroup ? currentGroup.id : 'root',
+              // eslint-disable-next-line perfectionist/sort-objects
               Date: toBasicISOString(date),
-              SubjectID: params.subjectId,
+              SubjectID: afterFirstDollar(params.subjectId),
               Value: objVal,
               Variable: objKey
             });