12 institutions reported holding $33.4M of BLACKROCK ETF TRUST (GMMF) in SEC 13F filings for 2026-03-31. Largest institutional holders: BlackRock, Inc. ($25.1M), Hummer Financial Advisory Services Inc ($3.2M), Cambridge Investment Research Advisors, Inc. ($1.6M), JANE STREET GROUP, LLC ($919,155), THURSTON, SPRINGER, MILLER, HERD & TITAK, INC. ($698,408). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $25.1M | 250,000 | Hold |
| 2 | Hummer Financial Advisory Services Inc | $3.2M | 32,000 | Added |
| 3 | Cambridge Investment Research Advisors, Inc. | $1.6M | 16,407 | New |
| 4 | JANE STREET GROUP, LLC | $919,155 | 9,144 | Trimmed |
| 5 | THURSTON, SPRINGER, MILLER, HERD & TITAK, INC. | $698,408 | 6,948 | Added |
| 6 | CITADEL ADVISORS LLC | $611,966 | 6,088 | Trimmed |
| 7 | NORTHCAPE WEALTH MANAGEMENT, LLC | $432,236 | 4,300 | Trimmed |
| 8 | Granite Bay Wealth Management, LLC | $397,501 | 3,954 | New |
| 9 | SEARLE & CO. | $301,560 | 3,000 | Hold |
| 10 | Royal Bank of Canada | $1,000 | 11 | Hold |
| 11 | WELLS FARGO & COMPANY/MN | $64 | 1 | New |
| 12 | Tower Research Capital LLC (TRC) | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31