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Public ownership evidence

Septerna, Inc. Common Stock (SEPN) Ownership Disclosures

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

As of 2026-11-07T14:03:26.246Z

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2026-10-192026-10-15Bhatt ElizabethS2,906Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-10-15 and its public availability date is 2026-10-19. Subtracting those calendar dates gives 4 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code S: a sale. A purchase-following rule excludes this sale even if the reported dollar amount is large.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0001193125-26-425485 ↗SEC 0001193125-26-425485 ↗SEC 0001193125-26-388033 ↗

Recent Form 4 activity

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2026-10-192026-10-15Bhatt ElizabethS2,906Not reported
2026-10-192026-10-15Bhatt ElizabethS1,094Not reported
2026-09-102026-09-08Patni RajivA275,000Not reported
2026-09-042026-09-01Long Daniel D.S3,333Not reported
2026-08-152026-08-12Kolchinsky Peter, RA CAPITAL MANAGEMENT, L.P., RA Capital Healthcare Fund LP, RA Capital Nexus Fund III, L.P., Shah Rajeev M.S746,500Not reported
2026-08-152026-08-12Kolchinsky Peter, RA CAPITAL MANAGEMENT, L.P., RA Capital Healthcare Fund LP, RA Capital Nexus Fund III, L.P., Shah Rajeev M.S746,500Not reported
2026-08-142026-08-11Bhatt ElizabethS25,000Not reported

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

Recent institutional filing receipts

Inspect all 50 displayed rows: 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.

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Cornerstone Financial Management LLC2026-06-302026-08-2952$1,741None
Cornerstone Financial Management LLC2026-03-312026-08-2952$1,250None
Cornerstone Financial Management LLC2025-12-312026-08-2952$1,450None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-2613,300$445,417None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2510,866$363,902None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25363,902$10,866,000None
Kalehua Capital Management LLC2026-06-302026-08-20194,544$6,515,279None
Kalehua Capital Management LLC2026-06-302026-08-15194,544$6,515,279None
Aster Capital Management (DIFC) Ltd2026-06-302026-08-15102$3,416None
First Light Asset Management, LLC2026-06-302026-08-15963,260$32,259,577None
Catalio Capital Management, LP2026-06-302026-08-15536,152$17,955,730None
ADAR1 Capital Management, LLC2026-06-302026-08-15940,747$31,505,617None
Ameritas Advisory Services, LLC2026-06-302026-08-1518$603None
Rangeley Capital, LLC2026-06-302026-08-157,200$241,128None
DIADEMA PARTNERS LP2026-06-302026-08-1559,700$1,999,353Put
XTX Topco Ltd2026-06-302026-08-1554,489$1,824,837None
Aquatic Capital Management LLC2026-06-302026-08-1517,427$583,630None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15187,041$6,264,003None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15187,041$6,264,003None
SAMSARA BIOCAPITAL, LLC2026-06-302026-08-153,149,128$105,464,297None
Caption Management, LLC2026-06-302026-08-15200,000$6,698,000Put
Caption Management, LLC2026-06-302026-08-15440,000$14,735,600Call
Caption Management, LLC2026-06-302026-08-1538,006$1,272,821None
OSAIC HOLDINGS, INC.2026-06-302026-08-1512,358$413,869None
OSAIC HOLDINGS, INC.2026-06-302026-08-15236$7,903None
Squarepoint Ops LLC2026-06-302026-08-1521,219$710,624None
Man Group plc2026-06-302026-08-1511,469$384,097None
Trexquant Investment LP2026-06-302026-08-1525,645$858,851None
MetLife Investment Management, LLC2026-06-302026-08-1512,880$431,351None
Engineers Gate Manager LP2026-06-302026-08-1517,350$581,052None
JANE STREET GROUP, LLC2026-06-302026-08-1519,516$653,591None
JANE STREET GROUP, LLC2026-06-302026-08-1526,036$871,946None
JANE STREET GROUP, LLC2026-06-302026-08-1557,200$1,915,628Call
Legal & General Group Plc2026-06-302026-08-155,895$197,423None
Legal & General Group Plc2026-06-302026-08-152,017$67,549None
Legal & General Group Plc2026-06-302026-08-152,150$72,004None
HRT FINANCIAL LP2026-06-302026-08-1542,022$1,407,000None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-15262,000$8,774,380Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1533,900$1,135,311Put
Verdad Advisers, LP2026-06-302026-08-1512,970$434,365None
Gotham Asset Management, LLC2026-06-302026-08-159,322$312,194None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-1550,562$1,693,321None
LAZARD ASSET MANAGEMENT LLC2026-06-302026-08-1575,425$2,525,983None
FRED ALGER MANAGEMENT, LLC2026-06-302026-08-1520,958$701,883None
Balyasny Asset Management L.P.2026-06-302026-08-15350,442$11,736,303None
Longaeva Partners L.P.2026-06-302026-08-15298,171$9,985,747None
Alyeska Investment Group, L.P.2026-06-302026-08-1535,000$1,172,150None
Woodline Partners LP2026-06-302026-08-15185,535$6,213,567None
Logos Global Management LP2026-06-302026-08-1523,548$788,623None
HighVista Strategies LLC2026-06-302026-08-1529,337$982,496None

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

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗VIRGINIA RETIREMENT SYSTEMS ET Al ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗Kalehua Capital Management LLC ↗Kalehua Capital Management LLC ↗Aster Capital Management (DIFC) Ltd ↗First Light Asset Management, LLC ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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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.