Comparable stake leader
BlackRock, Inc.
SEC ownership of FORMFACTOR INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001039399.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
14 Aug 2026
- Public ticker
- FORM on Nasdaq
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
14 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001039399
- Issuer location
- Livermore, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of FORMFACTOR INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
14 Aug 2026
13F
13D/G
3/4/5
Lead comparable stake: 12%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 12%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
12%
VANGUARD PORTFOLIO MANAGEMENT LLC
7.6%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
EARNEST PARTNERS LLC
4.8%
Mike Slessor
0.62%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
Company
|
12%
from 13D/G
|
$1,676,771,596
10,484,409 shares
|
— | 30 Jun 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Portfolio Management
|
7.6%
from 13D/G
|
$838,385,526
5,242,203 shares
|
— | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Capital Management
|
5.2%
from 13D/G
|
$562,194,572
3,515,254 shares
|
— | 30 Jun 2026 |
| EARNEST PARTNERS LLC |
13F
13D/G
Company
|
4.8%
from 13D/G
|
$601,850,815
3,763,214 shares
|
— | 30 Jun 2026 |
| Mike Slessor |
3/4/5
CEO, Director
|
0.62%
|
$66,016,541
484,204 shares
mixed-class rows
|
-$12,956,391 | 14 Aug 2026 |
| Thomas St Dennis |
3/4/5
Director
|
0.04%
|
$2,748,017
28,333 shares
|
-$1,337,060 | 15 Jun 2026 |
| Kelley Steven-Waiss |
3/4/5
Director
|
0.03%
|
$2,572,756
26,526 shares
|
-$1,145,015 | 15 May 2026 |
| Jorge Titinger |
3/4/5
Director
|
0.02%
|
$1,438,943
14,836 shares
|
-$693,979 | 15 May 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$20,123,899.
Buys
$0
Insiders: 0
Sells
$20,123,899
Insiders: 9
Net
-$20,123,899
Shares: -212,228
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 212,228
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 45,583 | $0 | $5,800,474 | -$5,800,474 |
| 3-6 | 0 | 50,380 | $0 | $5,872,540 | -$5,872,540 |
| 6-9 | 0 | 102,262 | $0 | $7,820,973 | -$7,820,973 |
| 9-12 | 0 | 14,003 | $0 | $629,913 | -$629,913 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-13 of 13 reporting-owner rows connected to FORMFACTOR INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
13
Largest Forms 3/4/5 holder
Mike Slessor
Net 12M change
-$20,123,899
Latest report
14 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mike Slessor | CEO, Director | $66,016,541 | -$12,956,391 | -16% | Mixed | 14 Aug 2026 |
| Thomas St Dennis | Director | $2,748,017 | -$1,337,060 | -33% | Mixed | 15 Jun 2026 |
| Kelley Steven-Waiss | Director | $2,572,756 | -$1,145,015 | -31% | Mixed | 15 May 2026 |
| Raymond A. Link | Director | $2,484,106 | Mixed | 30 May 2023 | ||
| Shai Shahar | CFO, SVP Global Finance | $2,295,042 | Mixed | 07 Aug 2025 | ||
| Aric Brendan McKinnis | CFO, SVP Global Finance | $2,263,329 | -$313,034 | -12% | Median | 06 Aug 2026 |
| Jorge Titinger | Director | $1,438,943 | -$693,979 | -33% | Mixed | 15 May 2026 |
| Rebeca Obregon-Jimenez | Director | $1,383,871 | -$749,568 | -35% | Filing P/S | 21 May 2026 |
| Brian C. White | Director | $1,090,278 | -$1,139,748 | -51% | Filing P/S | 20 May 2026 |
| Edward Rogas Jr. | Director | $828,898 | Mixed | 17 May 2021 | ||
| Kevin J. Brewer | Director | $779,701 | -$288,600 | -27% | Filing P/S | 11 Feb 2026 |
| Sheri Rhodes | Director | $674,025 | -$1,500,504 | -69% | Filing P/S | 02 Jun 2026 |
| Lothar Maier | Director | $372,890 | Filing P/S | 14 May 2024 |
Recent insider transactions for FORMFACTOR INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Mike Slessor | FORM | Common Stock | Sale | -3.2% | $2,095,532 | $130.95 | -16,002 | 484,204 | 14 Aug 2026 | Direct |
| Mike Slessor | FORM | Common Stock | Tax liability | -14.2% | -82,196 | 497,586 | 07 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Options Exercise | 34.4% | 147,700 | 576,494 | 07 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Restricted Stock Units | Options Exercise | -100% | -5,908 | 0 | 07 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Performance-based Restricted Stock Units | Options Exercise | -100% | -141,792 | 0 | 07 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Performance-based Restricted Stock Units | Award | 141,792 | 141,792 | 07 Aug 2026 | Direct | |||
| Mike Slessor | FORM | Restricted Stock Units | Award | 27,696 | 27,696 | 06 Aug 2026 | Direct | |||
| Aric Brendan McKinnis | FORM | Restricted Stock Units | Award | 6,924 | 6,924 | 06 Aug 2026 | Direct | |||
| Mike Slessor | FORM | Common Stock | Tax liability | -0.77% | -3,357 | 434,702 | 06 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Options Exercise | 1.4% | 6,031 | 438,059 | 06 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Restricted Stock Units | Options Exercise | -11.1% | -6,031 | 48,248 | 06 Aug 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Tax liability | -1.9% | -274 | 14,152 | 06 Aug 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Options Exercise | 8.25% | 1,099 | 14,426 | 06 Aug 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Restricted Stock Units | Options Exercise | -10% | -1,099 | 9,891 | 06 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Tax liability | -0.47% | -2,028 | 432,028 | 05 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Options Exercise | 0.85% | 3,644 | 434,056 | 05 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Restricted Stock Units | Options Exercise | -20% | -3,644 | 14,576 | 05 Aug 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Tax liability | -0.97% | -130 | 13,327 | 05 Aug 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Options Exercise | 4.03% | 521 | 13,457 | 05 Aug 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Restricted Stock Units | Options Exercise | -20% | -521 | 2,084 | 05 Aug 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Sale | -1.09% | $560,195 | $118.31 | -4,735 | 430,412 | 15 Jul 2026 | Direct |
| Thomas St Dennis | FORM | Common Stock | Gift | -2.55% | -740 | 28,333 | 16 Jun 2026 | Direct | ||
| Thomas St Dennis | FORM | Common Stock | Sale | -8.78% | $424,172 | $151.49 | -2,800 | 29,073 | 15 Jun 2026 | Direct |
| Mike Slessor | FORM | Common Stock | Sale | -2.66% | $1,442,897 | $121.35 | -11,890 | 435,147 | 10 Jun 2026 | Direct |
| Aric Brendan McKinnis | FORM | Common Stock | Tax liability | -1.47% | -193 | 12,936 | 02 Jun 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Options Exercise | 6.26% | 773 | 13,129 | 02 Jun 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Restricted Stock Units | Options Exercise | -100% | -773 | 0 | 02 Jun 2026 | Direct | ||
| Sheri Rhodes | FORM | Common Stock | Sale | -54.1% | $793,531 | $125.40 | -6,328 | 5,375 | 02 Jun 2026 | Direct |
| Rebeca Obregon-Jimenez | FORM | Restricted Stock Units | Sale | -32.7% | $484,146 | $126.48 | -3,828 | 7,875 | 21 May 2026 | Direct |
| Brian C. White | FORM | Common Stock | Sale | -27.3% | $409,500 | $126.00 | -3,250 | 8,653 | 20 May 2026 | Direct |
| Thomas St Dennis | FORM | Common Stock | Sale | -3.04% | $115,840 | $115.84 | -1,000 | 31,873 | 19 May 2026 | Direct |
| Thomas St Dennis | FORM | Common Stock | Award | 4.27% | 1,347 | 32,873 | 15 May 2026 | Direct | ||
| Rebeca Obregon-Jimenez | FORM | Restricted Stock Units | Award | 13% | 1,347 | 11,703 | 15 May 2026 | Direct | ||
| Sheri Rhodes | FORM | Common Stock | Award | 13% | 1,347 | 11,703 | 15 May 2026 | Direct | ||
| Kelley Steven-Waiss | FORM | Common Stock | Award | 5.35% | 1,347 | 26,526 | 15 May 2026 | Direct | ||
| Jorge Titinger | FORM | Common Stock | Award | 9.99% | 1,347 | 14,836 | 15 May 2026 | Direct | ||
| Brian C. White | FORM | Common Stock | Award | 12.8% | 1,347 | 11,903 | 15 May 2026 | Direct | ||
| Kelley Steven-Waiss | FORM | Common Stock | Sale | -17.7% | $678,241 | $125.60 | -5,400 | 25,179 | 15 May 2026 | Direct |
| Jorge Titinger | FORM | Common Stock | Sale | -22.9% | $516,299 | $128.78 | -4,009 | 13,489 | 13 May 2026 | Direct |
| Mike Slessor | FORM | Common Stock | Sale | -2.07% | $1,194,064 | $126.52 | -9,438 | 447,037 | 13 May 2026 | Direct |
| Mike Slessor | FORM | Common Stock | Tax liability | -0.72% | -3,288 | 456,475 | 07 May 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Options Exercise | 1.3% | 5,908 | 459,763 | 07 May 2026 | Direct | ||
| Mike Slessor | FORM | Restricted Stock Units | Options Exercise | -50% | -5,908 | 5,908 | 07 May 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Tax liability | -0.73% | -3,357 | 453,855 | 06 May 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Options Exercise | 1.34% | 6,031 | 457,212 | 06 May 2026 | Direct | ||
| Mike Slessor | FORM | Restricted Stock Units | Options Exercise | -10% | -6,031 | 54,279 | 06 May 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Tax liability | -2.17% | -274 | 12,356 | 06 May 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Options Exercise | 9.53% | 1,099 | 12,630 | 06 May 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Restricted Stock Units | Options Exercise | -9.09% | -1,099 | 10,990 | 06 May 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Tax liability | -0.45% | -2,028 | 451,181 | 05 May 2026 | Direct |
* marks a reported price that did not pass the local price check.