2 institutions reported holding $8.2M of VANGUARD MUN BD FDS (VWSTX) in SEC 13F filings for 2026-03-31. Largest institutional holders: SIMPLEX TRADING, LLC ($7.1M), IMC-Chicago, LLC ($1.1M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | SIMPLEX TRADING, LLC | $7.1M | 141,500 | Added |
| 2 | IMC-Chicago, LLC | $1.1M | 22,300 | New |
Source: SEC Form 13F filings · as of 2026-03-31