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Public ownership evidence

FormFactor Inc. (FORM) Ownership Disclosures

Read FORM 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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2026-10-152026-10-14SLESSOR MIKES1,200Not reported

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

The displayed observation date is 2026-10-14 and its public availability date is 2026-10-15. 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 0001628280-26-065922 ↗SEC 0001628280-26-065922 ↗SEC 0001628280-26-065922 ↗

Recent Form 4 activity

Inspect all 16 displayed rows: Recent Form 4 activity

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2026-10-152026-10-14SLESSOR MIKES1,200Not reported
2026-10-152026-10-14SLESSOR MIKES7,703Not reported
2026-10-152026-10-14SLESSOR MIKES2,195Not reported
2026-09-172026-09-16SLESSOR MIKES1,000Not reported
2026-09-172026-09-16SLESSOR MIKES7,773Not reported
2026-09-172026-09-16SLESSOR MIKES8,737Not reported
2026-09-052026-09-03STEVEN-WAISS KELLEYS2,100Not reported
2026-08-182026-08-14SLESSOR MIKES686Not reported
2026-08-182026-08-14SLESSOR MIKES5,535Not reported
2026-08-182026-08-14SLESSOR MIKES1,125Not reported
2026-08-182026-08-14SLESSOR MIKES3,282Not reported
2026-08-182026-08-14SLESSOR MIKES2,892Not reported
2026-08-182026-08-14SLESSOR MIKES2,482Not reported
2026-08-112026-08-07SLESSOR MIKEA141,792Not reported
2026-08-112026-08-06SLESSOR MIKEA27,696Not reported
2026-08-112026-08-06McKinnis Aric BrendanA6,924Not 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 LLC2026-06-302026-08-295$800None
Advisors Asset Management, Inc.2021-12-312026-08-282,057$94,046None
Advisors Asset Management, Inc.2022-06-302026-08-28474$18,000None
Advisors Asset Management, Inc.2021-09-302026-08-282,101$78,000None
Corient Private Wealth LP2026-06-302026-08-284,592$734,399None
Corient Private Wealth LP2026-06-302026-08-282,059$329,296None
Advisors Asset Management, Inc.2025-03-312026-08-27929$26,281None
Advisors Asset Management, Inc.2020-12-312026-08-27439$19,000None
Advisors Asset Management, Inc.2022-03-312026-08-271,341$56,362None
Advisors Asset Management, Inc.2021-03-312026-08-271,334$60,177None
Advisors Asset Management, Inc.2021-06-302026-08-272,020$74,000None
Advisors Asset Management, Inc.2025-09-302026-08-27591$21,524None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-03-312026-08-262,500$242,475None
VIRGINIA RETIREMENT SYSTEMS ET Al2026-06-302026-08-2612,800$2,047,104None
Advisors Asset Management, Inc.2025-06-302026-08-25894$30,763None
First Eagle Investment Management, LLC2026-06-302026-08-25106,100$16,968,573None
First Eagle Investment Management, LLC2026-06-302026-08-2537$5,917None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2590,452$14,465,988None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2514,465,988$90,452,000None
Advisors Asset Management, Inc.2024-09-302026-08-22620$28,520None
Advisors Asset Management, Inc.2024-06-302026-08-22311$18,825None
Advisors Asset Management, Inc.2024-12-312026-08-22941$41,404None
Advisors Asset Management, Inc.2025-12-312026-08-22580$32,352None
Assenagon Asset Management S.A.2026-06-302026-08-22259,518$41,504,714None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-2012,059$1,928,545None
Ensign Peak Advisors, Inc2026-03-312026-08-194,725$458,278None
Ensign Peak Advisors, Inc2025-12-312026-08-194,725$263,561None
Ensign Peak Advisors, Inc2025-09-302026-08-1911,275$410,636None
Fulcrum Asset Management LLP2026-06-302026-08-192,682$386,664None
Caitlin John, LLC2026-06-302026-08-18485$77,566None
Caitlin John, LLC2026-06-302026-08-182,019$322,899None
Corient Private Wealth LP2026-06-302026-08-186,633$1,060,817None
Integrated Investment Consultants, LLC2026-06-302026-08-185,639$901,845None
Integrated Investment Consultants, LLC2026-06-302026-08-181$160None
Empowered Funds, LLC2026-06-302026-08-182,807$448,924None
Empowered Funds, LLC2026-06-302026-08-1853$8,476None
Grandeur Peak Global Advisors, LLC2026-06-302026-08-181,731$276,839None
Transamerica Financial Advisors, LLC2026-06-302026-08-184$639None
Jefferies Financial Group Inc.2026-06-302026-08-188,035$1,285,038None
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO2026-06-302026-08-1824,636$3,940,035None
Wellington Grp LLC2026-06-302026-08-151,048$101,646None
CAXTON ASSOCIATES LLP2026-06-302026-08-151,475$235,897None
SEI INVESTMENTS CO2026-06-302026-08-151,342,153$214,650,529None
SEI INVESTMENTS CO2026-06-302026-08-15903$144,470None
Aster Capital Management (DIFC) Ltd2026-06-302026-08-1513,645$2,182,245None
Federation des caisses Desjardins du Quebec2026-06-302026-08-159,177$1,467,911None
Federation des caisses Desjardins du Quebec2026-06-302026-08-155,474$875,457None
Advisors Asset Management, Inc.2026-06-302026-08-15519$83,004None
SHELTON CAPITAL MANAGEMENT2026-06-302026-08-152,156$344,809None
Marex Group Ltd2026-06-302026-08-152,020$323,059None

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

Cornerstone Financial Management LLC ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Corient Private Wealth LP ↗Corient Private Wealth LP ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗

Recent Congressional disclosures

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Michael T. McCaul2026-10-142026-08-04purchase$1,000-$15,000
Michael T. McCaul2026-10-142026-08-05purchase$1,000-$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.

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.