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 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

FormFactor Inc.: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-09-17
Trade date
2026-09-16
Reporting owners
SLESSOR MIKE
Code
S
Shares
1,000
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001628280-26-062602
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read FORM fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read FORM fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity
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
2026-07-172026-07-15SLESSOR MIKES868Not reported
2026-07-172026-07-15SLESSOR MIKES300Not reported
2026-07-172026-07-15SLESSOR MIKES170Not reported
2026-07-172026-07-15SLESSOR MIKES706Not reported
2026-07-172026-07-15SLESSOR MIKES1,650Not reported
2026-07-172026-07-15SLESSOR MIKES1,041Not reported

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

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.

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

No matching Congressional transactions were returned in this source preview.

No records are available for this view.

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.

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