SPERO THERAPEUTICS INC COM is a security (CUSIP 84833T903) tracked across SEC portfolio filings. 3 institutional managers reported $43K on Form 13F as of 2026-03-31.
| Manager | Location | Value | Shares |
|---|---|---|---|
| GROUP ONE TRADING, L.P. | CHICAGO, IL | $43K | — |
| SIMPLEX TRADING, LLC | CHICAGO, IL | $234 | — |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | BIRMINGHAM, AL | — | — |