Comparable stake leader
VANGUARD PORTFOLIO MANAGEMENT LLC
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
02 Jun 2026
- Public ticker
- FORM on Nasdaq
- Parsed ownership sources
- 13D/G, 13F, and 3/4/5
- Largest SEC-reported holder
- VANGUARD PORTFOLIO MANAGEMENT LLC
- Latest 13D/G holder
- VANGUARD PORTFOLIO MANAGEMENT LLC
- Latest parsed ownership date
- 02 Jun 2026
- Issuer CIK
- 0001039399
- Issuer location
- Livermore, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
2 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
VANGUARD PORTFOLIO MANAGE...
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
02 Jun 2026
13D/G
13F
3/4/5
Lead comparable stake: 7.6%
13D/G row: VANGUARD PORTFOLIO MANAGEMENT LLC
Showing 1-8 of 50 holder rows.
Quick read
VANGUARD PORTFOLIO MANAGEMENT LLC leads the comparable SEC ownership view at 7.6%.
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 VANGUARD PORTFOLIO MANAGEMENT LLC's linked filing trail.
Comparable ownership
Top 5
VANGUARD PORTFOLIO MANAGEMENT LLC
7.6%
EARNEST PARTNERS LLC
6.3%
VANGUARD CAPITAL MANAGEMENT LLC
5.2%
Thomas St Dennis
0.04%
Kelley Steven-Waiss
0.03%
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 |
|---|---|---|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
7.6%
|
$576,081,998
5,939,602 shares
|
$0 | 31 Mar 2026 |
| EARNEST PARTNERS LLC |
13D/G
13F
Company
|
6.3%
|
$512,477,345
4,875,165 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.2%
|
$394,344,852
4,065,830 shares
|
$0 | 31 Mar 2026 |
| Thomas St Dennis |
3/4/5
Director
|
0.04%
|
$3,692,165
31,873 shares
|
-$912,888 | 19 May 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 |
| Aric Brendan McKinnis |
3/4/5
CFO, SVP Global Finance
|
0.02%
|
$1,254,662
12,936 shares
|
-$313,034 | 02 Jun 2026 |
| Brian C. White |
3/4/5
Director
|
0.01%
|
$1,090,278
8,653 shares
|
-$1,139,748 | 20 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: -$17,298,323.
Buys
$0
Insiders: 0
Sells
$17,298,323
Insiders: 9
Net
-$17,298,323
Shares: -196,691
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 196,691
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 66,664 | $0 | $8,050,057 | -$8,050,057 |
| 3-6 | 0 | 105,324 | $0 | $8,212,925 | -$8,212,925 |
| 6-9 | 0 | 13,103 | $0 | $671,488 | -$671,488 |
| 9-12 | 0 | 11,600 | $0 | $363,852 | -$363,852 |
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
-$17,298,322
Latest report
10 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mike Slessor | CEO, Director | $55,141,707 | -$10,436,784 | -16% | Mixed | 10 Jun 2026 |
| Thomas St Dennis | Director | $3,692,165 | -$912,888 | -20% | Filing P/S | 19 May 2026 |
| Kelley Steven-Waiss | Director | $2,572,756 | -$1,145,015 | -31% | Median | 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 | ||
| Jorge Titinger | Director | $1,438,943 | -$693,979 | -33% | Median | 15 May 2026 |
| Rebeca Obregon-Jimenez | Director | $1,383,871 | -$867,770 | -39% | Filing P/S | 21 May 2026 |
| Aric Brendan McKinnis | CFO, SVP Global Finance | $1,254,662 | -$313,034 | -20% | Median | 02 Jun 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 | -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 | ||
| Mike Slessor | FORM | Common Stock | Options Exercise | 0.81% | 3,644 | 453,209 | 05 May 2026 | Direct | ||
| Mike Slessor | FORM | Restricted Stock Units | Options Exercise | -16.7% | -3,644 | 18,220 | 05 May 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Tax liability | -1.11% | -130 | 11,531 | 05 May 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Options Exercise | 4.68% | 521 | 11,661 | 05 May 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Restricted Stock Units | Options Exercise | -16.7% | -521 | 2,605 | 05 May 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Sale | -2.45% | $1,442,463 | $127.72 | -11,294 | 449,565 | 15 Apr 2026 | Direct |
| Mike Slessor | FORM | Common Stock | Sale | -2.17% | $973,076 | $95.15 | -10,227 | 460,859 | 18 Mar 2026 | Direct |
| Aric Brendan McKinnis | FORM | Common Stock | Sale | -23.7% | $313,034 | $90.42 | -3,462 | 11,140 | 05 Mar 2026 | Direct |
| Aric Brendan McKinnis | FORM | Common Stock | Tax liability | -1.3% | -193 | 14,602 | 02 Mar 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Common Stock | Options Exercise | 5.51% | 773 | 14,795 | 02 Mar 2026 | Direct | ||
| Aric Brendan McKinnis | FORM | Restricted Stock Units | Options Exercise | -50% | -773 | 773 | 02 Mar 2026 | Direct | ||
| Brian C. White | FORM | Common Stock | Sale | -17.9% | $230,023 | $100.01 | -2,300 | 10,556 | 24 Feb 2026 | Direct |
| Mike Slessor | FORM | Common Stock | Sale | -1.81% | $815,597 | $94.14 | -8,664 | 471,086 | 18 Feb 2026 | Direct |
| Kevin J. Brewer | FORM | Common Stock | Sale | -27% | $288,600 | $96.20 | -3,000 | 8,105 | 11 Feb 2026 | Direct |
| Thomas St Dennis | FORM | Common Stock | Sale | -19.1% | $697,355 | $93.84 | -7,431 | 31,526 | 10 Feb 2026 | Direct |
| Sheri Rhodes | FORM | Common Stock | Sale | -42.4% | $706,973 | $92.61 | -7,634 | 10,356 | 10 Feb 2026 | Direct |
| Kelley Steven-Waiss | FORM | Common Stock | Sale | -6.71% | $206,139 | $93.70 | -2,200 | 30,579 | 10 Feb 2026 | Direct |
| Mike Slessor | FORM | Common Stock | Tax liability | -0.68% | -3,288 | 479,750 | 09 Feb 2026 | Direct | ||
| Mike Slessor | FORM | Common Stock | Options Exercise | 1.24% | 5,908 | 483,038 | 09 Feb 2026 | Direct | ||
| Mike Slessor | FORM | Restricted Stock Units | Options Exercise | -33.3% | -5,908 | 11,816 | 09 Feb 2026 | Direct | ||
| Rebeca Obregon-Jimenez | FORM | Restricted Stock Units | Sale | -21.1% | $265,422 | $95.82 | -2,770 | 10,356 | 09 Feb 2026 | Direct |
| Brian C. White | FORM | Common Stock | Sale | -30% | $500,225 | $90.95 | -5,500 | 12,856 | 09 Feb 2026 | Direct |
| Jorge Titinger | FORM | Common Stock | Sale | -10.3% | $177,680 | $88.84 | -2,000 | 17,498 | 09 Feb 2026 | Direct |
* marks a reported price that did not pass the local price check.