FORM SEC Filing News — FormFactor, Inc.

Latest SEC filings for FormFactor, Inc. (FORM) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-14.

FormFactor, Inc. designs, manufactures, and sells probe cards, analytical probes, probe stations, thermal systems, cryogenic systems, and related services in the United States, South Korea, Taiwan, China, Japan, Singapore, Europe, Malaysia, and internationally. It operates in two segments: Probe Cards and Systems segments. The company provides probe cards to test various semiconductor device types, including systems- on-chip products, such as graphics, central, digital processing units, and othe…
Sector: Technology Industry: Semiconductor Equipment & Materials Market Cap: $8.7B CIK: 1039399
20
Total Filings
0
Bullish Classifications
7
Bearish Classifications
11
Insider Transactions
2
Material Events (8-K)
1
Periodic Reports
Rule-based classifications for FORM currently lean bearish. Of the 20 filing records displayed, 7 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
FORM Filing Activity Snapshot 2026-06-11 — 2026-10-14
Insider Transactions (Form 4)
0 buys vs 7 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$2.10M
SLESSOR MIKE (Director, CEO) · 2026-08-17
16,002 shares · Form 4
Form 144 Notices
6
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 11 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 11 filings in this group are Form 4s for FormFactor, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 11 insider filings shown, the breakdown is 7 open-market sale, 2 compensation award and 2 option exercise. 7 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×7
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Compensation award ×2
Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Option exercise ×2
The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.
Form 4 Open-market sale Insider Selling 2026-10-14

FORM insider SLESSOR MIKE (Director, CEO) sold 11,098 shares (~$1.39M)

SLESSOR MIKE, listed as Director, CEO at FORMFACTOR INC, reported an open-market sale of 11,098 FORM shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,195 $124.23 $272.7K
S Open-market sale 7,703 $125.36 $965.6K
S Open-market sale 1,200 $125.92 $151.1K
Filing: Form 4 (Insider Transaction) Insider: SLESSOR MIKE (Director, CEO) Shares: 11,098 Est. Value: $1.39M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-17

FORM insider SLESSOR MIKE (Director, CEO) sold 17,510 shares (~$1.83M)

SLESSOR MIKE, listed as Director, CEO at FORMFACTOR INC, reported an open-market sale of 17,510 FORM shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 8,737 $104.26 $910.9K
S Open-market sale 7,773 $105.12 $817.1K
S Open-market sale 1,000 $105.80 $105.8K
Filing: Form 4 (Insider Transaction) Insider: SLESSOR MIKE (Director, CEO) Shares: 17,510 Est. Value: $1.83M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-04

FORM insider STEVEN-WAISS KELLEY (Director) sold 2,100 shares (~$201.8K)

STEVEN-WAISS KELLEY, listed as Director at FORMFACTOR INC, reported an open-market sale of 2,100 FORM shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,100 $96.10 $201.8K
Filing: Form 4 (Insider Transaction) Insider: STEVEN-WAISS KELLEY (Director) Shares: 2,100 Est. Value: $201.8K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-08-17

FORM insider SLESSOR MIKE (Director, CEO) sold 16,002 shares (~$2.10M)

SLESSOR MIKE, listed as Director, CEO at FORMFACTOR INC, reported an open-market sale of 16,002 FORM shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,482 $128.72 $319.5K
S Open-market sale 2,892 $129.55 $374.7K
S Open-market sale 3,282 $130.54 $428.4K
S Open-market sale 1,125 $131.65 $148.1K
S Open-market sale 5,535 $132.50 $733.4K
S Open-market sale 686 $133.33 $91.5K
Filing: Form 4 (Insider Transaction) Insider: SLESSOR MIKE (Director, CEO) Shares: 16,002 Est. Value: $2.10M
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-08-10

FORM insider Form 4 filed for equity award, exercise, or tax withholding

SLESSOR MIKE (Director, CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 141,792 — —
F Tax withholding on vested shares 78,908 $117.39 $9.26M
M Option exercise 5,908 — —
F Tax withholding on vested shares 3,288 $117.39 $386.0K
A Compensation award derivative · Restricted Stock Units 27,696 — —
A Compensation award derivative · Performance-based Restricted Stock Units 141,792 — —
M Option exercise derivative · Performance-based Restricted Stock Units 141,792 — —
M Option exercise derivative · Restricted Stock Units 5,908 — —
Filing: Form 4 (Insider Transaction) Insider: SLESSOR MIKE (Director, CEO) Shares: 229,896
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-08-10

FORM insider Form 4 filed for equity award, exercise, or tax withholding

McKinnis Aric Brendan (CFO, SVP Global Finance) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award derivative · Restricted Stock Units 6,924 — —
Filing: Form 4 (Insider Transaction) Insider: McKinnis Aric Brendan (CFO, SVP Global Finance)
View on SEC EDGAR → Open Filing Document →
Form 4 Option exercise Tax / Compensation Filing 2026-08-07

FORM insider Form 4 filed for equity award, exercise, or tax withholding

SLESSOR MIKE (Director, CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 3,644 — —
F Tax withholding on vested shares 2,028 $114.44 $232.1K
M Option exercise 6,031 — —
F Tax withholding on vested shares 3,357 $115.21 $386.8K
M Option exercise derivative · Restricted Stock Units 3,644 — —
M Option exercise derivative · Restricted Stock Units 6,031 — —
Filing: Form 4 (Insider Transaction) Insider: SLESSOR MIKE (Director, CEO) Shares: 15,060
View on SEC EDGAR → Open Filing Document →
Form 4 Option exercise Tax / Compensation Filing 2026-08-07

FORM insider Form 4 filed for equity award, exercise, or tax withholding

McKinnis Aric Brendan (CFO, SVP Global Finance) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 521 — —
F Tax withholding on vested shares 130 $114.44 $14.9K
M Option exercise 1,099 — —
F Tax withholding on vested shares 274 $115.21 $31.6K
M Option exercise derivative · Restricted Stock Units 521 — —
M Option exercise derivative · Restricted Stock Units 1,099 — —
Filing: Form 4 (Insider Transaction) Insider: McKinnis Aric Brendan (CFO, SVP Global Finance) Shares: 2,024
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-07-16

FORM insider SLESSOR MIKE (Director, CEO) sold 4,735 shares (~$560.2K)

SLESSOR MIKE, listed as Director, CEO at FORMFACTOR INC, reported an open-market sale of 4,735 FORM shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 1,041 $116.56 $121.3K
S Open-market sale 1,650 $117.39 $193.7K
S Open-market sale 706 $118.21 $83.5K
S Open-market sale 170 $119.08 $20.2K
S Open-market sale 300 $120.58 $36.2K
S Open-market sale 868 $121.30 $105.3K
Filing: Form 4 (Insider Transaction) Insider: SLESSOR MIKE (Director, CEO) Shares: 4,735 Est. Value: $560.2K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-06-16

FORM insider St Dennis Thomas (Director) sold 2,800 shares (~$424.2K)

St Dennis Thomas, listed as Director at FORMFACTOR INC, reported an open-market sale of 2,800 FORM shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,800 $151.49 $424.2K
G Gift 740 — —
Filing: Form 4 (Insider Transaction) Insider: St Dennis Thomas (Director) Shares: 2,800 Est. Value: $424.2K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-06-11

FORM insider SLESSOR MIKE (Director, CEO) sold 11,890 shares (~$1.44M)

SLESSOR MIKE, listed as Director, CEO at FORMFACTOR INC, reported an open-market sale of 11,890 FORM shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 1,399 $117.70 $164.7K
S Open-market sale 767 $119.00 $91.3K
S Open-market sale 400 $119.46 $47.8K
S Open-market sale 975 $121.00 $118.0K
S Open-market sale 4,220 $121.72 $513.7K
S Open-market sale 2,500 $122.63 $306.6K
S Open-market sale 1,629 $123.37 $201.0K
Filing: Form 4 (Insider Transaction) Insider: SLESSOR MIKE (Director, CEO) Shares: 11,890 Est. Value: $1.44M
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 6 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. FormFactor, Inc. has 6 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-10-14

FORM Form 144 filed for proposed insider sale by MIKE SLESSOR (11,098 shares) ~$1.39M

MIKE SLESSOR filed a Form 144 with the SEC indicating intent to sell FORM (FORMFACTOR INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MIKE SLESSOR Shares: 11,098 Est. Value: $1.39M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-16

FORM Form 144 filed for proposed insider sale by MIKE SLESSOR (17,510 shares) ~$1.83M

MIKE SLESSOR filed a Form 144 with the SEC indicating intent to sell FORM (FORMFACTOR INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MIKE SLESSOR Shares: 17,510 Est. Value: $1.83M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-03

FORM Form 144 filed for proposed insider sale by KELLEY LYNNE STEVEN-WAISS (2,100 shares) ~$201.8K

KELLEY LYNNE STEVEN-WAISS filed a Form 144 with the SEC indicating intent to sell FORM (FORMFACTOR INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: KELLEY LYNNE STEVEN-WAISS Shares: 2,100 Est. Value: $201.8K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-08-14

FORM Form 144 filed for proposed insider sale by MIKE SLESSOR (16,002 shares) ~$2.10M

MIKE SLESSOR filed a Form 144 with the SEC indicating intent to sell FORM (FORMFACTOR INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MIKE SLESSOR Shares: 16,002 Est. Value: $2.10M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-07-15

FORM Form 144 filed for proposed insider sale by MIKE SLESSOR (4,735 shares) ~$560.2K

MIKE SLESSOR filed a Form 144 with the SEC indicating intent to sell FORM (FORMFACTOR INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: MIKE SLESSOR Shares: 4,735 Est. Value: $560.2K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-06-15

FORM Form 144 filed for proposed insider sale by THOMAS M. ST. DENNIS (2,800 shares) ~$424.2K

THOMAS M. ST. DENNIS filed a Form 144 with the SEC indicating intent to sell FORM (FORMFACTOR INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: THOMAS M. ST. DENNIS Shares: 2,800 Est. Value: $424.2K
View on SEC EDGAR → Open Filing Document →
Material Events 2 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 2 in this period for FormFactor, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-10-13

FORM filed 8-K — material company event

FORMFACTOR INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Form 8-K Material Company Update 2026-07-29

FORM filed 8-K — material company event

FORMFACTOR INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for FormFactor, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-04

FORM filed Quarterly Report (10-Q)

FORMFACTOR INC filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →

How we classify FormFactor, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on FORM. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — FORM SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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