Public ownership evidence

Sionna Therapeutics, Inc. Common Stock (SION) Ownership Disclosures

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

As of 2026-09-21T22:57:45.000Z

Recent Form 4 activity

2026-09-212026-09-17Kolchinsky Peter, RA CAPITAL MANAGEMENT, L.P., RA Capital Healthcare Fund LP, RA Capital Nexus Fund III, L.P., RA Capital Nexus Fund, L.P., Shah Rajeev M.S33,800Not reported
2026-09-212026-09-17Kolchinsky Peter, RA CAPITAL MANAGEMENT, L.P., RA Capital Healthcare Fund LP, RA Capital Nexus Fund III, L.P., RA Capital Nexus Fund, L.P., Shah Rajeev M.S3,415,011Not reported
2026-09-182026-09-17Ridloff ElenaA47,268Not reported
2026-09-182026-09-17Ridloff ElenaA165,440Not reported
2026-09-182026-09-17Ridloff ElenaA47,269Not reported
2026-09-182026-09-17McKee CharlotteA50,000Not reported
2026-09-182026-09-17McKee CharlotteA155,700Not reported
2026-09-182026-09-17McKee CharlotteA50,000Not reported
2026-09-182026-09-17Fitzpatrick JenniferA28,132Not reported
2026-09-182026-09-17Fitzpatrick JenniferA28,133Not reported
2026-09-182026-09-17Fitzpatrick JenniferA103,140Not reported
2026-09-182026-09-17Cloonan MichaelA109,025Not reported
2026-09-182026-09-17Cloonan MichaelA109,025Not reported
2026-09-182026-09-17Cloonan MichaelA436,100Not 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.

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2514,852$653,339None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25653,339$14,852,000None
Kalehua Capital Management LLC2026-06-302026-08-20197,072$8,669,197None
Ensign Peak Advisors, Inc2026-03-312026-08-19255,636$10,248,447None
Ensign Peak Advisors, Inc2025-12-312026-08-1979,862$3,285,523None
Ishara Investments LP2026-06-302026-08-15123,000$1,350,540None
Kalehua Capital Management LLC2026-06-302026-08-15197,072$8,669,197None
SEI INVESTMENTS CO2026-06-302026-08-155,158$226,900None
Federation des caisses Desjardins du Quebec2026-06-302026-08-15210$9,238None
Rafferty Asset Management, LLC2026-06-302026-08-1518,004$791,996None
Susquehanna Portfolio Strategies, LLC2026-06-302026-08-1518,034$793,316None
First Turn Management, LLC2026-06-302026-08-15110,493$4,860,587None
Quarry LP2026-06-302026-08-156,750$296,933None
ENAVATE SCIENCES GP, LLC2026-06-302026-08-152,478,030$109,008,540None
Artia Global Partners LP2026-06-302026-08-15119,741$5,267,407None
SUPERSTRING CAPITAL MANAGEMENT LP2026-06-302026-08-1563,156$2,778,232None
TPG GP A, LLC2026-06-302026-08-156,494,962$285,713,378None
XTX Topco Ltd2026-06-302026-08-1538,096$1,675,843None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15129,753$5,707,834None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15129,753$5,707,834None
Qube Research & Technologies Ltd2026-06-302026-08-15140,309$6,172,193None
Shay Capital LLC2026-06-302026-08-1518,000$791,820None
Squarepoint Ops LLC2026-06-302026-08-155,415$238,206None
Trexquant Investment LP2026-06-302026-08-1523,810$1,047,402None
Maven Securities LTD2026-06-302026-08-1520,000$879,800None
MetLife Investment Management, LLC2026-06-302026-08-1510,972$482,658None
Engineers Gate Manager LP2026-06-302026-08-1515,603$686,376None
EVENTIDE ASSET MANAGEMENT, LLC2026-06-302026-08-15474,981$20,894,402None
BOOTHBAY FUND MANAGEMENT, LLC2026-06-302026-08-1532,500$1,429,675Put
Legal & General Group Plc2026-06-302026-08-154,723$207,765None
Legal & General Group Plc2026-06-302026-08-152,531$111,339None
Legal & General Group Plc2026-06-302026-08-151,790$78,742None
Ensign Peak Advisors, Inc2026-06-302026-08-15184,532$8,117,563None
Verition Fund Management LLC2026-06-302026-08-155,000$219,950Call
Verition Fund Management LLC2026-06-302026-08-155,000$219,950Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-158,100$356,319Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-157,700$338,723Put
Ikarian Capital, LLC2026-06-302026-08-15107,500$4,728,925Put
SEVEN GRAND MANAGERS, LLC2026-06-302026-08-1550,000$2,199,500None
STEMPOINT CAPITAL LP2026-06-302026-08-1559,426$2,614,150None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-1528,600$1,258,114Put
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-1520,000$879,800Call
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-15276,733$12,173,485None
VARCOV Co.2026-06-302026-08-156,418$282,328None
Sio Capital Management, LLC2026-06-302026-08-15127,808$5,622,274None
DEERFIELD MANAGEMENT COMPANY, L.P.2026-06-302026-08-15680,916$29,953,495None
Longaeva Partners L.P.2026-06-302026-08-15196,352$8,637,524None
AMERIPRISE FINANCIAL INC2026-06-302026-08-1582,232$3,617,386None
ORBIMED ADVISORS LLC2026-06-302026-08-152,555,877$112,433,029None
Alyeska Investment Group, L.P.2026-06-302026-08-15136,222$5,992,406None

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

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗Kalehua Capital Management LLC ↗Ensign Peak Advisors, Inc ↗Ensign Peak Advisors, Inc ↗Ishara Investments LP ↗Kalehua Capital Management LLC ↗SEI INVESTMENTS CO ↗Federation des caisses Desjardins du Quebec ↗Rafferty Asset Management, LLC ↗

Recent Congressional disclosures

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.

Institutional source directory ↗Congressional source directory ↗

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.