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Public ownership evidence

Amphastar Pharmaceuticals, Inc. (AMPH) Ownership Disclosures

Read AMPH 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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2026-11-062026-11-05PETERS WILLIAM JS12,631Not reported

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

The displayed observation date is 2026-11-05 and its public availability date is 2026-11-06. 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 0001263136-26-000016 ↗SEC 0001263136-26-000016 ↗SEC 0001263136-26-000014 ↗

Recent Form 4 activity

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2026-11-062026-11-05PETERS WILLIAM JS12,631Not reported
2026-11-062026-11-04PETERS WILLIAM JS16,000Not reported
2026-09-232026-09-21PETERS WILLIAM JS4,139Not reported
2026-09-172026-09-16Zhou RongS10,000Not reported
2026-09-042026-09-02Zhou RongS3,187Not reported
2026-08-132026-08-11PRINS RICHARD KS7,973Not reported
2026-08-122026-08-07PETERS WILLIAM JS8,180Not 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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Advisors Asset Management, Inc.2024-03-312026-08-27930$40,836None
Advisors Asset Management, Inc.2023-09-302026-08-27442$20,328None
Advisors Asset Management, Inc.2023-12-312026-08-27843$52,140None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2536,151$729,527None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25729,527$36,151,000None
Advisors Asset Management, Inc.2024-09-302026-08-22873$42,367None
Advisors Asset Management, Inc.2024-06-302026-08-22926$37,040None
Advisors Asset Management, Inc.2024-12-312026-08-22399$14,815None
Assenagon Asset Management S.A.2026-06-302026-08-2215,216$307,059None
Fulcrum Asset Management LLP2026-06-302026-08-191,750$36,243None
Empowered Funds, LLC2026-06-302026-08-18162,812$3,285,546None
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO2026-06-302026-08-18754$15,216None
Aster Capital Management (DIFC) Ltd2026-06-302026-08-15238$4,803None
JPL Wealth Management, LLC2026-06-302026-08-155$101None
Basecamp Wealth Advisors LLC2026-06-302026-08-154,416$89,115None
XTX Topco Ltd2026-06-302026-08-1546,808$944,585None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15310,178$6,259,392None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15310,178$6,259,392None
OSAIC HOLDINGS, INC.2026-06-302026-08-1512,742$257,132None
Squarepoint Ops LLC2026-06-302026-08-1578,795$1,590,083None
Man Group plc2026-06-302026-08-1517,342$349,962None
MetLife Investment Management, LLC2026-06-302026-08-1520,761$418,957None
Engineers Gate Manager LP2026-06-302026-08-1530,191$609,254None
JANE STREET GROUP, LLC2026-06-302026-08-1590,524$1,826,774None
JANE STREET GROUP, LLC2026-06-302026-08-1588,210$1,780,078None
State of Tennessee, Department of Treasury2026-06-302026-08-158,619$173,932None
VOLORIDGE INVESTMENT MANAGEMENT, LLC2026-06-302026-08-1550,912$1,027,404None
Legal & General Group Plc2026-06-302026-08-1520,799$419,725None
Legal & General Group Plc2026-06-302026-08-155,600$113,008None
Legal & General Group Plc2026-06-302026-08-1551,882$1,046,979None
HRT FINANCIAL LP2026-06-302026-08-15387,530$7,820,000None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1511,200$226,016Call
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1550,565$1,020,402None
Gotham Asset Management, LLC2026-06-302026-08-1510,139$204,605None
SYSTEMATIC FINANCIAL MANAGEMENT LP2026-06-302026-08-1521,124$426,312None
SYSTEMATIC FINANCIAL MANAGEMENT LP2026-06-302026-08-15416,260$8,400,127None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-1531,814$642,007None
Thrivent Financial for Lutherans2026-06-302026-08-1522,295$450,000None
JONES FINANCIAL COMPANIES LLLP2026-06-302026-08-15228$4,966None
AMERIPRISE FINANCIAL INC2026-06-302026-08-15759$15,317None
AMERIPRISE FINANCIAL INC2026-06-302026-08-1567,485$1,361,848None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-15206,841$4,174,051None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-15357$7,204None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-157$141None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-1529$585None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-15145$2,926None
AQR CAPITAL MANAGEMENT LLC2026-06-302026-08-151,272$25,669None
MANUFACTURERS LIFE INSURANCE COMPANY, THE2026-06-302026-08-1514,247$287,504None
ROYAL BANK OF CANADA2026-06-302026-08-153,654$74,000None
ROYAL BANK OF CANADA2026-06-302026-08-1575$2,000None

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

Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Assenagon Asset Management S.A. ↗Fulcrum Asset Management LLP ↗

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.