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Public ownership evidence

MBX Biosciences, Inc. Common Stock (MBX) Ownership Disclosures

Read MBX 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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2026-11-052026-11-04Azoulay SalomonS373Not reported

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

The displayed observation date is 2026-11-04 and its public availability date is 2026-11-05. Subtracting those calendar dates gives 1 day 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 0001193125-26-449832 ↗SEC 0001193125-26-428390 ↗13F 0002110329-26-000015 ↗

Recent Form 4 activity

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2026-11-052026-11-04Azoulay SalomonS373Not reported
2026-10-222026-10-20Radovich PeterA18,200Not 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 LLC2026-06-302026-08-2934$1,877None
Cornerstone Financial Management LLC2026-03-312026-08-2934$1,015None
Cornerstone Financial Management LLC2025-12-312026-08-2934$1,072None
OPTIMIZE FINANCIAL INC.2026-06-302026-08-2814,458$798,082None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2523,376$1,290,355None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-251,290,355$23,376,000None
Seven Fleet Capital Management LP2026-06-302026-08-186,000$331,200None
SEI INVESTMENTS CO2026-06-302026-08-155,868$323,914None
Aster Capital Management (DIFC) Ltd2026-06-302026-08-15172$9,494None
Rafferty Asset Management, LLC2026-06-302026-08-156,410$353,832None
Susquehanna Portfolio Strategies, LLC2026-06-302026-08-153,800$209,760None
Quarry LP2026-06-302026-08-1518$994None
Kynam Capital Management, LP2026-06-302026-08-15934,799$51,600,905None
Frazier Life Sciences Management, L.P.2026-06-302026-08-156,652,013$367,191,118None
Deep Track Capital, LP2026-06-302026-08-151,732,569$95,637,809None
Paradigm Biocapital Advisors LP2026-06-302026-08-152,508,015$138,442,428None
XTX Topco Ltd2026-06-302026-08-156,392$352,838None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15233,095$12,866,844None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15233,095$12,866,844None
Caption Management, LLC2026-06-302026-08-15200,000$11,040,000Put
Caption Management, LLC2026-06-302026-08-15200,000$11,040,000Call
OSAIC HOLDINGS, INC.2026-06-302026-08-159$497None
OSAIC HOLDINGS, INC.2026-06-302026-08-15273$15,069None
Schonfeld Strategic Advisors LLC2026-06-302026-08-15248,670$13,726,583None
MetLife Investment Management, LLC2026-06-302026-08-1518,250$1,007,400None
JANE STREET GROUP, LLC2026-06-302026-08-1537,600$2,075,520Call
Cormorant Asset Management, LP2026-06-302026-08-15550,000$30,360,000None
EVENTIDE ASSET MANAGEMENT, LLC2026-06-302026-08-15873,492$48,216,758None
BOOTHBAY FUND MANAGEMENT, LLC2026-06-302026-08-1570,353$3,883,486None
Legal & General Group Plc2026-06-302026-08-1513,525$746,580None
Legal & General Group Plc2026-06-302026-08-155,045$278,484None
Legal & General Group Plc2026-06-302026-08-153,013$166,318None
Ensign Peak Advisors, Inc2026-06-302026-08-1542,156$2,327,011None
MOORE CAPITAL MANAGEMENT, LP2026-06-302026-08-1564,893$3,582,094None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1594,400$5,210,880Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1531,000$1,711,200Put
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1526,684$1,472,957None
PFM Health Sciences, LP2026-06-302026-08-1570,971$3,917,599None
BRAIDWELL LP2026-06-302026-08-15710,880$39,240,576None
Caligan Partners LP2026-06-302026-08-15200,000$11,040,000None
Opaleye Management Inc.2026-06-302026-08-15260,000$14,352,000None
Parkman Healthcare Partners LLC2026-06-302026-08-15800,173$44,169,550None
Verdad Advisers, LP2026-06-302026-08-154,574$252,485None
DAFNA Capital Management LLC2026-06-302026-08-1511,809$651,857None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-15226,151$12,483,535None
TCG Crossover Management, LLC2026-06-302026-08-15650,000$35,880,000None
FRED ALGER MANAGEMENT, LLC2026-06-302026-08-159,877$545,210None
Blackstone Inc.2026-06-302026-08-155,533$305,422None
JONES FINANCIAL COMPANIES LLLP2026-06-302026-08-1580$4,185None
Kemnay Advisory Services Inc.2026-06-302026-08-15321$17,719None

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

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗OPTIMIZE FINANCIAL INC. ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗Seven Fleet Capital Management LP ↗SEI INVESTMENTS CO ↗Aster Capital Management (DIFC) Ltd ↗Rafferty 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.