Public ownership evidence

Spero Therapeutics, Inc. Common Stock (SPRO) Ownership Disclosures

Read SPRO insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Recent Form 4 activity

2026-08-072026-08-03Zack DebraA162,311Not reported
2026-08-072026-08-03Zack DebraA324,675Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

Assenagon Asset Management S.A.2026-06-302026-08-2218,636$41,186None
Federation des caisses Desjardins du Quebec2026-06-302026-08-1591,900$202,180None
Susquehanna Portfolio Strategies, LLC2026-06-302026-08-1517,628$38,958None
Capital Asset Advisory Services LLC2026-06-302026-08-1532,548$71,931None
XTX Topco Ltd2026-06-302026-08-1550,536$111,685None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-1528,565$63,129None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-1528,565$63,129None
Qube Research & Technologies Ltd2026-06-302026-08-1513,644$30,153None
Shay Capital LLC2026-06-302026-08-1572,391$159,984None
OSAIC HOLDINGS, INC.2026-06-302026-08-15290$640None
JANE STREET GROUP, LLC2026-06-302026-08-15158,097$349,394None
JANE STREET GROUP, LLC2026-06-302026-08-1526,800$59,228Put
JANE STREET GROUP, LLC2026-06-302026-08-1547,100$104,091Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1513,700$30,277Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1534,600$76,466Put
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15759,290$1,678,031None
SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC2026-06-302026-08-1516,095$35,570None
Verdad Advisers, LP2026-06-302026-08-1551,335$113,450None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-1519,298$42,649None
JONES FINANCIAL COMPANIES LLLP2026-06-302026-08-157,678$17,352None
ROYAL BANK OF CANADA2026-06-302026-08-152,014$4,000None
BRIDGEWAY CAPITAL MANAGEMENT, LLC2026-06-302026-08-15114,800$253,708None
CITADEL ADVISORS LLC2026-06-302026-08-1565,600$144,976Put
GROUP ONE TRADING LLC2026-06-302026-08-1510,869$24,020None
Ionic Capital Management LLC2026-06-302026-08-15102,698$226,963None
Point72 Asset Management, L.P.2026-06-302026-08-15104,377$230,673None
Invesco Ltd.2026-06-302026-08-1564,245$141,981None
TWO SIGMA SECURITIES, LLC2026-06-302026-08-1510,576$23,373None
TWO SIGMA INVESTMENTS, LP2026-06-302026-08-15382,814$846,019None
GOLDMAN SACHS GROUP INC2026-06-302026-08-15256,985$567,937None
RAYMOND JAMES FINANCIAL INC2026-06-302026-08-15518,643$1,146,201None
RAYMOND JAMES FINANCIAL INC2026-06-302026-08-152,062$4,557None
RAYMOND JAMES FINANCIAL INC2026-06-302026-08-151,000$2,210None
WELLS FARGO & COMPANY/MN2026-06-302026-08-15200$442None
VANGUARD CAPITAL MANAGEMENT LLC2026-06-302026-08-142,036,226$4,500,059None
GSK plc2026-06-302026-08-149,190,606$20,311,239None
Vanguard Global Advisers, LLC2026-06-302026-08-1425,446$56,236None
UBS Group AG2026-06-302026-08-14139,680$308,693None
Three Seasons Wealth, LLC2026-06-302026-08-1430,000$66,300None
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP2026-06-302026-08-14332,970$735,864None
RENAISSANCE TECHNOLOGIES LLC2026-06-302026-08-14947,904$2,094,868None
VANGUARD FIDUCIARY TRUST CO2026-06-302026-08-14287,648$635,702None
MORGAN STANLEY2026-06-302026-08-14900$1,989None
MORGAN STANLEY2026-06-302026-08-141$2None
MORGAN STANLEY2026-06-302026-08-1413$29None
FMR LLC2026-06-302026-08-14300$663None
Pfizer Inc2026-06-302026-08-142,362,348$5,338,906None
NORTHERN TRUST CORP2026-06-302026-08-14108,274$239,286None
Integrated Wealth Concepts LLC2026-06-302026-08-136,000$13,260None
SIMPLEX TRADING, LLC2026-06-302026-08-1361,312$135,499None

90-day public filing window, up to 50 source positions.

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.