BLACKROCK
Rank #1
15.8%
- Shares
- 12.25M
- Change
- +677.93K
- Change %
- +5.86%
- Filing
- Mar 31, 2026
Increased
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NASDAQ · TECHNOLOGY · 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
Price Jun 15, 10:01 AM EDT · Statements Mar 30, 8:00 PM EDT
Source timingDetailsHide
Data freshness
Prices update fastest. Fundamentals, analyst data, and news update on their own schedules, so check these timestamps before comparing signals.
Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
PriceLive
Last traded •
Source: Market data provider
Fundamentalsevery 1 day
Provider checked •
Source: Market data provider
Analystevery 1 day
Provider checked •
Source: Market data provider
Newsevery 4 hr
Latest item •
Source: Market data provider
Ownership read
FORM insider sentiment: Net selling.
BLACKROCK is the largest loaded institutional holder. 94 sale rows and 0 purchase rows are visible in the loaded Form 4 history. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
FORM
Purchases—
Sales279.17K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
12.25M
BLACKROCK
Insider stance
Net selling
$19.86M sold / — bought
Latest filing
Jun 10, 2026
Most recent holder or insider filing date
Rows loaded
240
120 holder / 120 insider
- Holder rows
- 120
- Market data source
- Latest filing
- Jun 10, 2026
- Most recent holder or insider filing date
- Increased / initiated
- 69
- 50 decreased in loaded rows
- Insider rows
- 120
- Market data source
Top 120 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 GROUP INC
Rank #2
13.2%
- Shares
- 10.22M
- Change
- -78.33K
- Change %
- -76.00%
- Filing
- Dec 31, 2025
Decreased
VANGUARD PORTFOLIO MANAGEMENT LLC
Rank #3
7.57%
- Shares
- 5.88M
- Change
- +5.88M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
EARNEST PARTNERS LLC
Rank #4
6.28%
- Shares
- 4.88M
- Change
- -899.83K
- Change %
- -15.58%
- Filing
- Mar 31, 2026
Decreased
VANGUARD CAPITAL MANAGEMENT LLC
Rank #5
4.47%
- Shares
- 3.47M
- Change
- +3.47M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
STATE STREET CORP
Rank #6
3.77%
- Shares
- 2.93M
- Change
- +58.59K
- Change %
- +2.04%
- Filing
- Mar 31, 2026
Increased
BANK OF AMERICA CORP
Rank #7
3.19%
- Shares
- 2.48M
- Change
- -35.33K
- Change %
- -1.40%
- Filing
- Mar 31, 2026
Decreased
POLAR CAPITAL HOLDINGS PLC
Rank #8
2.95%
- Shares
- 2.29M
- Change
- +2.29M
- Change %
- —
- Filing
- Mar 31, 2026
Initiated
ALLIANCEBERNSTEIN L.P.
Rank #9
2.87%
- Shares
- 2.23M
- Change
- +816.85K
- Change %
- +57.74%
- Filing
- Mar 31, 2026
Increased
GEODE CAPITAL MANAGEMENT
Rank #10
2.82%
- Shares
- 2.19M
- Change
- +302.02K
- Change %
- +16.02%
- Filing
- Mar 31, 2026
Increased
PRIMECAP MANAGEMENT CO
Rank #11
2.30%
- Shares
- 1.79M
- Change
- -292.60K
- Change %
- -14.06%
- Filing
- Mar 31, 2026
Decreased
SEI INVESTMENTS CO
Rank #12
2.17%
- Shares
- 1.68M
- Change
- -2.75K
- Change %
- -16.00%
- Filing
- Mar 31, 2026
Decreased
DIMENSIONAL FUND ADVISORS LP
Rank #13
1.82%
- Shares
- 1.41M
- Change
- -310.14K
- Change %
- -18.01%
- Filing
- Mar 31, 2026
Decreased
AMERIPRISE FINANCIAL INC
Rank #14
1.81%
- Shares
- 1.40M
- Change
- +88.31K
- Change %
- +6.71%
- Filing
- Mar 31, 2026
Increased
MORGAN STANLEY
Rank #15
1.68%
- Shares
- 1.31M
- Change
- -962.64K
- Change %
- -42.38%
- Filing
- Mar 31, 2026
Decreased
INVESCO LTD.
Rank #16
1.59%
- Shares
- 1.24M
- Change
- +905.44K
- Change %
- +2.72%
- Filing
- Mar 31, 2026
Increased
REINHART PARTNERS
Rank #17
1.49%
- Shares
- 1.16M
- Change
- -992.65K
- Change %
- -46.12%
- Filing
- Mar 31, 2026
Decreased
FULLER & THALER ASSET MANAGEMENT
Rank #18
1.46%
- Shares
- 1.14M
- Change
- +52.83K
- Change %
- +4.87%
- Filing
- Mar 31, 2026
Increased
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
Rank #19
1.22%
- Shares
- 947.54K
- Change
- -4.18K
- Change %
- -44.00%
- Filing
- Mar 31, 2026
Decreased
JANE STREET GROUP
Rank #20
1.19%
- Shares
- 925.62K
- Change
- +807.08K
- Change %
- +6.81%
- Filing
- Mar 31, 2026
Increased
| # | Institution | % held | Shares | Change | Change % | Filing date |
|---|---|---|---|---|---|---|
| 1 | 15.8% | 12.25M | +677.93K Increased | +5.86% | Mar 31, 2026 | |
| 2 | 13.2% | 10.22M | -78.33K Decreased | -76.00% | Dec 31, 2025 | |
| 3 | 7.57% | 5.88M | +5.88M Initiated | — | Mar 31, 2026 | |
| 4 | EARNEST PARTNERS LLC | 6.28% | 4.88M | -899.83K Decreased | -15.58% | Mar 31, 2026 |
| 5 | 4.47% | 3.47M | +3.47M Initiated | — | Mar 31, 2026 | |
| 6 | 3.77% | 2.93M | +58.59K Increased | +2.04% | Mar 31, 2026 | |
| 7 | 3.19% | 2.48M | -35.33K Decreased | -1.40% | Mar 31, 2026 | |
| 8 | POLAR CAPITAL HOLDINGS PLC | 2.95% | 2.29M | +2.29M Initiated | — | Mar 31, 2026 |
| 9 | 2.87% | 2.23M | +816.85K Increased | +57.74% | Mar 31, 2026 | |
| 10 | 2.82% | 2.19M | +302.02K Increased | +16.02% | Mar 31, 2026 | |
| 11 | PRIMECAP MANAGEMENT CO | 2.30% | 1.79M | -292.60K Decreased | -14.06% | Mar 31, 2026 |
| 12 | SEI INVESTMENTS CO | 2.17% | 1.68M | -2.75K Decreased | -16.00% | Mar 31, 2026 |
| 13 | 1.82% | 1.41M | -310.14K Decreased | -18.01% | Mar 31, 2026 | |
| 14 | AMERIPRISE FINANCIAL INC | 1.81% | 1.40M | +88.31K Increased | +6.71% | Mar 31, 2026 |
| 15 | 1.68% | 1.31M | -962.64K Decreased | -42.38% | Mar 31, 2026 | |
| 16 | 1.59% | 1.24M | +905.44K Increased | +2.72% | Mar 31, 2026 | |
| 17 | REINHART PARTNERS | 1.49% | 1.16M | -992.65K Decreased | -46.12% | Mar 31, 2026 |
| 18 | FULLER & THALER ASSET MANAGEMENT | 1.46% | 1.14M | +52.83K Increased | +4.87% | Mar 31, 2026 |
| 19 | 1.22% | 947.54K | -4.18K Decreased | -44.00% | Mar 31, 2026 | |
| 20 | JANE STREET GROUP | 1.19% | 925.62K | +807.08K Increased | +6.81% | Mar 31, 2026 |
Showing 20 of 120 matching institutional rows.Load more institutions
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, MIKE
Director, CEO
- Shares
- 767
- % company
- <0.01%
- Price
- $119.00
- Value
- $91,273
Filed Jun 10, 2026
SLESSOR, MIKE
Director, CEO
- Shares
- 1.63K
- % company
- <0.01%
- Price
- $123.37
- Value
- $200,970
Filed Jun 10, 2026
SLESSOR, MIKE
Director, CEO
- Shares
- 2.50K
- % company
- <0.01%
- Price
- $122.63
- Value
- $306,575
Filed Jun 10, 2026
SLESSOR, MIKE
Director, CEO
- Shares
- 4.22K
- % company
- <0.01%
- Price
- $121.72
- Value
- $513,658
Filed Jun 10, 2026
SLESSOR, MIKE
Director, CEO
- Shares
- 975
- % company
- <0.01%
- Price
- $121.00
- Value
- $117,975
Filed Jun 10, 2026
SLESSOR, MIKE
Director, CEO
- Shares
- 1.40K
- % company
- <0.01%
- Price
- $117.70
- Value
- $164,662
Filed Jun 10, 2026
SLESSOR, MIKE
Director, CEO
- Shares
- 400
- % company
- <0.01%
- Price
- $119.46
- Value
- $47,784
Filed Jun 10, 2026
RHODES, SHERI
Director
- Shares
- 6.33K
- % company
- <0.01%
- Price
- $125.40
- Value
- $793,531
Filed Jun 2, 2026
MCKINNIS, ARIC BRENDAN
CFO, SVP Global Finance
- Shares
- 773
- % company
- <0.01%
- Price
- Not reported
- Value
- Not reported
Filed Jun 2, 2026
MCKINNIS, ARIC BRENDAN
CFO, SVP Global Finance
- Shares
- 773
- % company
- <0.01%
- Price
- No cash value
- Value
- No cash value
Filed Jun 2, 2026
MCKINNIS, ARIC BRENDAN
CFO, SVP Global Finance
- Shares
- 193
- % company
- <0.01%
- Price
- $125.11
- Value
- $24,146
Filed Jun 2, 2026
OBREGON-JIMENEZ, REBECA
Director
- Shares
- 3.83K
- % company
- <0.01%
- Price
- $126.48
- Value
- $484,146
Filed May 21, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | SLESSOR, MIKE Director, CEO | <0.01% | Sale to issuer | 767 | $119.00 | $91,273 | Jun 10, 2026 |
| 2 | SLESSOR, MIKE Director, CEO | <0.01% | Sale to issuer | 1.63K | $123.37 | $200,970 | Jun 10, 2026 |
| 3 | SLESSOR, MIKE Director, CEO | <0.01% | Sale to issuer | 2.50K | $122.63 | $306,575 | Jun 10, 2026 |
| 4 | SLESSOR, MIKE Director, CEO | <0.01% | Sale to issuer | 4.22K | $121.72 | $513,658 | Jun 10, 2026 |
| 5 | SLESSOR, MIKE Director, CEO | <0.01% | Sale to issuer | 975 | $121.00 | $117,975 | Jun 10, 2026 |
| 6 | SLESSOR, MIKE Director, CEO | <0.01% | Sale to issuer | 1.40K | $117.70 | $164,662 | Jun 10, 2026 |
| 7 | SLESSOR, MIKE Director, CEO | <0.01% | Sale to issuer | 400 | $119.46 | $47,784 | Jun 10, 2026 |
| 8 | RHODES, SHERI Director | <0.01% | Sale to issuer | 6.33K | $125.40 | $793,531 | Jun 2, 2026 |
| 9 | MCKINNIS, ARIC BRENDAN CFO, SVP Global Finance | <0.01% | Sale to issuer | 773 | Not reported | Not reported | Jun 2, 2026 |
| 10 | MCKINNIS, ARIC BRENDAN CFO, SVP Global Finance | <0.01% | Award / grant | 773 | No cash value | No cash value | Jun 2, 2026 |
| 11 | MCKINNIS, ARIC BRENDAN CFO, SVP Global Finance | <0.01% | Sale to issuer | 193 | $125.11 | $24,146 | Jun 2, 2026 |
| 12 | OBREGON-JIMENEZ, REBECA Director | <0.01% | Sale to issuer | 3.83K | $126.48 | $484,146 | May 21, 2026 |
Showing 12 of 120 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest FORM shareholders?
BLACKROCK is the largest institutional holder in the loaded FORM ownership dataset, with 12.25 million shares, or about 15.77% of shares outstanding. The table ranks additional institutions by reported share count.
What is institutional ownership of FORM?
The current TECHi snapshot has 120 loaded institutional rows for FormFactor Inc. 69 rows are marked increased or initiated, while 50 rows are marked decreased, with the latest holder filing dated Mar 31, 2026.
Where can I see FormFactor Inc insider transactions?
The insider transaction table currently shows 120 loaded Form 4 rows for FORM, with the latest insider filing dated Jun 10, 2026. It separates purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are not confused with open-market trades.
Are FORM insiders buying or selling?
The loaded FORM Form 4 rows currently read Net selling: 94 sale rows and 0 purchase rows. Awards, gifts, conversions, and tax withholding are shown separately because they do not carry the same signal as open-market buying or selling.
Who is the most active FORM insider in the loaded filings?
SLESSOR, MIKE is the most active insider by absolute share movement in the loaded FORM rows, with 250,756 shares moving across the visible filing history. Review the action labels before treating that activity as buying or selling.