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Public ownership evidence

Allegro MicroSystems, Inc. Common Stock (ALGM) Ownership Disclosures

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

As of 2026-10-14T23:32:50.005Z

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2026-10-012026-09-30Willett RobertA618.98Not reported

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

The displayed observation date is 2026-09-30 and its public availability date is 2026-10-01. 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 A: a award. An award is an acquisition but is not an open-market purchase. A purchase-following rule must not count it as code P.

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.

Recent Form 4 activity

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2026-10-012026-09-30Willett RobertA618.98Not reported
2026-08-192026-08-17Raubacher JennieS1,000Not reported
2026-08-132026-08-10Hagen ErinS2,285Not reported
2026-08-082026-08-05Suzuki YoshihiroA4,251Not reported
2026-08-082026-08-05MARTIN JOSEPH RA4,251Not reported
2026-08-082026-08-05PUMA MARY GA4,251Not reported
2026-08-082026-08-05Palepu Krishna G.A4,251Not reported
2026-08-082026-08-05Raubacher JennieA4,251Not reported
2026-08-082026-08-05Willett RobertA4,251Not reported
2026-08-082026-08-05WHITE BRIAN CA4,251Not 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.2021-12-312026-08-285,600$202,608None
Advisors Asset Management, Inc.2022-12-312026-08-2811,024$330,940None
Advisors Asset Management, Inc.2022-06-302026-08-287,888$163,000None
Advisors Asset Management, Inc.2021-09-302026-08-281,687$54,000None
Corient Private Wealth LP2026-06-302026-08-2819,425$1,352,371None
Principia Wealth Advisory, LLC2026-06-302026-08-2720$1,392None
Principia Wealth Advisory, LLC2026-03-312026-08-2717$536None
Advisors Asset Management, Inc.2024-03-312026-08-2711,976$322,873None
Advisors Asset Management, Inc.2025-03-312026-08-2722,672$569,747None
Advisors Asset Management, Inc.2022-09-302026-08-279,825$215,000None
Advisors Asset Management, Inc.2022-03-312026-08-277,402$210,217None
Advisors Asset Management, Inc.2023-06-302026-08-2712,026$542,854None
Advisors Asset Management, Inc.2023-09-302026-08-2712,179$388,997None
Advisors Asset Management, Inc.2023-03-312026-08-277,932$380,657None
Advisors Asset Management, Inc.2025-09-302026-08-2722,499$656,971None
Advisors Asset Management, Inc.2023-12-312026-08-2712,995$393,359None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-03-312026-08-2615,069$475,126None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-2623,469$1,633,912None
Advisors Asset Management, Inc.2025-06-302026-08-2522,033$753,308None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25144,618$10,068,305None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2510,068,305$144,618,000None
Advisors Asset Management, Inc.2024-09-302026-08-2218,441$429,675None
Advisors Asset Management, Inc.2024-06-302026-08-2212,222$345,149None
Advisors Asset Management, Inc.2024-12-312026-08-2219,149$418,597None
Advisors Asset Management, Inc.2025-12-312026-08-2223,744$626,367None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-2013,153$915,698None
Copia Wealth Management2026-06-302026-08-1927$1,880None
Ensign Peak Advisors, Inc2026-03-312026-08-196,366$200,720None
Ensign Peak Advisors, Inc2025-12-312026-08-196,366$167,935None
Ensign Peak Advisors, Inc2025-09-302026-08-1923,466$685,207None
Corient Private Wealth LP2026-06-302026-08-1819,406$1,351,049None
Transamerica Financial Advisors, LLC2026-06-302026-08-18386$26,873None
UNITED CAPITAL FINANCIAL ADVISORS, LLC2026-06-302026-08-183,414$237,683None
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO2026-06-302026-08-1836,089$2,512,516None
Odyssean, LLC2026-06-302026-08-154,034$280,847None
ROSS\JOHNSON & Associates LLC2026-06-302026-08-152$139None
Graham Capital Management, L.P.2026-06-302026-08-153,605$250,980None
SEI INVESTMENTS CO2026-06-302026-08-15168,175$11,708,344None
SEI INVESTMENTS CO2026-06-302026-08-151,468$102,210None
Sphera Management Technology Funds Ltd2026-06-302026-08-1547,550$3,310,431None
Axxion S.A.2026-06-302026-08-156,702$466,593None
Advisors Asset Management, Inc.2026-06-302026-08-1525,476$1,773,639None
SHELTON CAPITAL MANAGEMENT2026-06-302026-08-154,135$287,879None
MANNING & NAPIER ADVISORS LLC2026-06-302026-08-155$332None
Basecamp Wealth Advisors LLC2026-06-302026-08-15189$13,158None
Quarry LP2026-06-302026-08-15254$17,684None
T. Rowe Price Investment Management, Inc.2026-06-302026-08-15517,648$36,039,000None
XTX Topco Ltd2026-06-302026-08-153,192$222,227None
Treasurer of the State of North Carolina2026-06-302026-08-1552,807$3,676,000None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-151,360,480$94,716,618None

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

Recent Congressional disclosures

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Gilbert Ray Cisneros, Jr.2026-10-122026-09-29purchase$1,001 - $15,000

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.