Blackrock Inc.
Rank #1
13.5%
- Shares
- 10.48M
- Change %
- -14.40%
- Filing
- Jun 30, 2026
Decreased
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
Holders
FormFactor Inc. (FORM) Institutional Ownership & Insider Trading History
Top FORM institutional shareholders, filing changes, and Form 4 insider activity with filters for buys, sales, option exercises, gifts, and tax withholding.
Section freshness
Prices as of Sep 24, 4:00 PM EDT · Fundamentals checked Sep 24, 5:54 PM EDT · Statements Jun 27, 2026
Market pulse
$129.04
FORM
-1.69%
Day range
$124.36 - $129.86
Market cap
$10.08B
Volume
930.1K
Last tick
Sep 24, 4:00 PM EDT
52-week position
75%
$34.80 - $160.27
Ownership read
FORM insider sentiment: Net selling.
Blackrock Inc. is the largest institutional holder. 45 sales and 0 purchases appear in the recent Form 4 filings. Use the filters below to separate open-market activity from option exercises, gifts, awards, and tax withholding.
Insider flow
FORM
Purchases0
Sales283.04K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
10.48M
Blackrock Inc.
Insider stance
Net selling
$23.81M sold / $0.0000 bought
Latest filing
Sep 16, 2026
Most recent holder or insider filing date
Filings shown
123
30 holder / 93 insider
- Holder rows
- 30
- Yahoo Finance · delayed, minutes not stated · as of 2026-09-24 20:00 · delay not stated · current source
- Latest filing
- Sep 16, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 7
- 13 decreased
- Insider rows
- 93
- Yahoo Finance · delayed, minutes not stated · as of 2026-09-24 20:00 · delay not stated · current source
Top 30 institutional holders
FormFactor Inc. (FORM) institutional ownership
Ranked by reported share count, with position changes and latest filing dates where ownership data supplies them.
Vanguard Portfolio Management LLC
Rank #2
6.72%
- Shares
- 5.24M
- Change %
- -10.85%
- Filing
- Jun 30, 2026
Decreased
Earnest Partners LLC
Rank #3
4.83%
- Shares
- 3.76M
- Change %
- -22.81%
- Filing
- Jun 30, 2026
Decreased
Vanguard Capital Management LLC
Rank #4
4.51%
- Shares
- 3.52M
- Change %
- +1.23%
- Filing
- Jun 30, 2026
Increased
State Street Corporation
Rank #5
3.31%
- Shares
- 2.58M
- Change %
- -11.84%
- Filing
- Jun 30, 2026
Decreased
Polar Capital Holdings PLC
Rank #6
2.75%
- Shares
- 2.15M
- Change %
- -6.38%
- Filing
- Jun 30, 2026
Decreased
Geode Capital Management, LLC
Rank #7
2.35%
- Shares
- 1.83M
- Change %
- -16.22%
- Filing
- Jun 30, 2026
Decreased
Bank of America Corporation
Rank #8
2.29%
- Shares
- 1.78M
- Change %
- -28.11%
- Filing
- Jun 30, 2026
Decreased
Primecap Management Company
Rank #9
2.17%
- Shares
- 1.69M
- Change %
- -5.51%
- Filing
- Jun 30, 2026
Decreased
Invesco Ltd.
Rank #10
2.02%
- Shares
- 1.58M
- Change %
- +27.47%
- Filing
- Jun 30, 2026
Increased
iShares Trust-iShares Core S&P Small-Cap ETF
Rank #11
6.09%
- Shares
- 4.75M
- Change %
- +1.11%
- Filing
- Jul 31, 2026
Increased
VANGUARD INDEX FUNDS-Vanguard Total Stock Market Index Fund
Rank #12
3.18%
- Shares
- 2.48M
- Change %
- +0.47%
- Filing
- Jun 30, 2026
Increased
VANGUARD INDEX FUNDS-Vanguard Small-Cap Index Fund
Rank #13
2.29%
- Shares
- 1.79M
- Change %
- -0.52%
- Filing
- Jun 30, 2026
Decreased
VANGUARD WORLD FUND-Vanguard Information Technology Index Fund
Rank #14
1.47%
- Shares
- 1.14M
- Change %
- -40.85%
- Filing
- May 31, 2026
Decreased
VANGUARD HORIZON FUNDS-Vanguard Capital Opportunity Fund
Rank #15
1.34%
- Shares
- 1.04M
- Change %
- -4.84%
- Filing
- Jun 30, 2026
Decreased
VANGUARD INDEX FUNDS-Vanguard Small-Cap Growth Index Fund
Rank #16
1.32%
- Shares
- 1.03M
- Change %
- +2.56%
- Filing
- Jun 30, 2026
Increased
VANGUARD INDEX FUNDS-Vanguard Extended Market Index Fund
Rank #17
1.15%
- Shares
- 893.75K
- Change %
- +3.31%
- Filing
- Jun 30, 2026
Increased
HARBOR FUNDS-Harbor Small Cap Value Fund
Rank #18
1.03%
- Shares
- 802.50K
- Change %
- -14.94%
- Filing
- Apr 30, 2026
Decreased
Capitol Series Trust-FullerThaler Behavioral Small-Cap Growth Fund
Rank #19
1.00%
- Shares
- 780.00K
- Change %
- +5.42%
- Filing
- Jun 30, 2026
Increased
SPDR SERIES TRUST-State Street SPDR Portfolio S&P 600 Small Cap ETF
Rank #20
0.94%
- Shares
- 731.93K
- Change %
- -0.65%
- Filing
- Aug 31, 2026
Decreased
| # | Institution | % held | Shares | Filing date |
|---|---|---|---|---|
| 1 | 13.5% | 10.48M | Jun 30, 2026 | |
| 2 | 6.72% | 5.24M | Jun 30, 2026 | |
| 3 | Earnest Partners LLC | 4.83% | 3.76M | Jun 30, 2026 |
| 4 | 4.51% | 3.52M | Jun 30, 2026 | |
| 5 | 3.31% | 2.58M | Jun 30, 2026 | |
| 6 | Polar Capital Holdings PLC | 2.75% | 2.15M | Jun 30, 2026 |
| 7 | 2.35% | 1.83M | Jun 30, 2026 | |
| 8 | 2.29% | 1.78M | Jun 30, 2026 | |
| 9 | Primecap Management Company | 2.17% | 1.69M | Jun 30, 2026 |
| 10 | 2.02% | 1.58M | Jun 30, 2026 | |
| 11 | iShares Trust-iShares Core S&P Small-Cap ETF | 6.09% | 4.75M | Jul 31, 2026 |
| 12 | 3.18% | 2.48M | Jun 30, 2026 | |
| 13 | 2.29% | 1.79M | Jun 30, 2026 | |
| 14 | 1.47% | 1.14M | May 31, 2026 | |
| 15 | 1.34% | 1.04M | Jun 30, 2026 | |
| 16 | 1.32% | 1.03M | Jun 30, 2026 | |
| 17 | 1.15% | 893.75K | Jun 30, 2026 | |
| 18 | HARBOR FUNDS-Harbor Small Cap Value Fund | 1.03% | 802.50K | Apr 30, 2026 |
| 19 | Capitol Series Trust-FullerThaler Behavioral Small-Cap Growth Fund | 1.00% | 780.00K | Jun 30, 2026 |
| 20 | 0.94% | 731.93K | Aug 31, 2026 |
Showing 20 of 30 matching institutional rows.
Recent insider transactions
FormFactor Inc. (FORM) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
SLESSOR MICHAEL D
Chief Executive Officer
- Shares
- 17.51K
- % company
- 0.02%
- Price
- $104.73
- Value
- $1,833,817
Filed Sep 16, 2026
STEVEN-WAISS KELLEY
Director
- Shares
- 2.10K
- % company
- <0.01%
- Price
- $96.10
- Value
- $201,810
Filed Sep 3, 2026
SLESSOR MICHAEL D
Chief Executive Officer
- Shares
- 16.00K
- % company
- 0.02%
- Price
- $130.95
- Value
- $2,095,532
Filed Aug 14, 2026
SLESSOR MICHAEL D
Chief Executive Officer
- Shares
- 147.70K
- % company
- 0.19%
Filed Aug 7, 2026
SLESSOR MICHAEL D
Chief Executive Officer
- Shares
- 9.68K
- % company
- 0.01%
Filed Aug 6, 2026
MCKINNIS ARIC BRENDAN
Chief Financial Officer
- Shares
- 1.62K
- % company
- <0.01%
Filed Aug 6, 2026
SLESSOR MICHAEL D
Chief Executive Officer
- Shares
- 4.74K
- % company
- <0.01%
- Price
- $118.31
- Value
- $560,195
Filed Jul 15, 2026
ST DENNIS THOMAS
Director
- Shares
- 740
- % company
- <0.01%
Filed Jun 16, 2026
ST DENNIS THOMAS
Director
- Shares
- 2.80K
- % company
- <0.01%
- Price
- $151.49
- Value
- $424,172
Filed Jun 15, 2026
SLESSOR MICHAEL D
Chief Executive Officer
- Shares
- 11.89K
- % company
- 0.02%
- Price
- $121.35
- Value
- $1,442,897
Filed Jun 10, 2026
MCKINNIS ARIC BRENDAN
Officer
- Shares
- 773
- % company
- <0.01%
Filed Jun 2, 2026
RHODES SHERI
Director
- Shares
- 6.33K
- % company
- <0.01%
- Price
- $125.40
- Value
- $793,531
Filed Jun 2, 2026
| # | Insider | % company | Action | Shares | Filing date |
|---|---|---|---|---|---|
| 1 | SLESSOR MICHAEL D Chief Executive Officer | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 17.51K | Sep 16, 2026 |
| 2 | STEVEN-WAISS KELLEY Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.10K | Sep 3, 2026 |
| 3 | SLESSOR MICHAEL D Chief Executive Officer | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 16.00K | Aug 14, 2026 |
| 4 | SLESSOR MICHAEL D Chief Executive Officer | 0.19% | OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 147.70K | Aug 7, 2026 |
| 5 | SLESSOR MICHAEL D Chief Executive Officer | 0.01% | OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 9.68K | Aug 6, 2026 |
| 6 | MCKINNIS ARIC BRENDAN Chief Financial Officer | <0.01% | OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 1.62K | Aug 6, 2026 |
| 7 | SLESSOR MICHAEL D Chief Executive Officer | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 4.74K | Jul 15, 2026 |
| 8 | ST DENNIS THOMAS Director | <0.01% | Stock GiftProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 740 | Jun 16, 2026 |
| 9 | ST DENNIS THOMAS Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 2.80K | Jun 15, 2026 |
| 10 | SLESSOR MICHAEL D Chief Executive Officer | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 11.89K | Jun 10, 2026 |
| 11 | MCKINNIS ARIC BRENDAN Officer | <0.01% | OtherProvider-supplied Form 4 action code. Review the original filing before making a trading judgment. | 773 | Jun 2, 2026 |
| 12 | RHODES SHERI Director | <0.01% | SaleOpen-market or direct sale reported on Form 4. | 6.33K | Jun 2, 2026 |
Showing 12 of 93 matching Form 4 rows. Percent of company uses current shares outstanding.
Frequently asked
Common questions.
Who are the largest FORM shareholders?
Blackrock Inc. is the largest reported institutional holder of FORM, with 10.48 million shares, or about 13.45% of shares outstanding.
What does the institutional filing activity show for FORM?
FormFactor Inc. has 30 institutional rows on file: 7 increased or initiated positions and 13 reduced them as of Sep 16, 2026.
What insider transactions are available for FORM?
TECHi shows 93 dated FORM insider transactions through Sep 16, 2026, with transaction types kept separate so administrative actions are not presented as open-market trades.
Are FORM insiders buying or selling?
The displayed FORM activity reads Net selling: 45 sales and 0 purchases. Other transaction types remain separate.
Who is the most active reported FORM insider?
SLESSOR MICHAEL D has the largest absolute share movement in the displayed FORM filing rows, totaling 510,219 shares. The action labels provide the transaction context.
How to use this page
Use this to check who owns the float and whether insiders are active.
Best for Institutional concentration, insider transaction pattern, and float context.
Weak when Filings are delayed or transactions are administrative rather than economic.
Street view
Buy
Target $138.63 · +7.43%i
Buy
10
63%
Hold
6
38%
Sell
0
0%
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