FORMFACTOR INC FORM
COM · Common Stock · CUSIP 346375108 · ISIN US3463751087
Company in Livermore, United States
- SectorTechnology
- IndustrySemiconductors & Related Devices
- HeadquartersLivermore, CA
- Founded1993
- Websiteformfactor.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($17.2m this quarter). Holder counts are more reliable. Shares outstanding: 78.1m as of 2026-07-29, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $158.36. Options: 13 managers hold calls ($138.4m notional), 11 hold puts ($100.9m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 239 |
| Q4 2022 | 209 |
| Q1 2023 | 224 |
| Q2 2023 | 233 |
| Q3 2023 | 232 |
| Q4 2023 | 246 |
| Q1 2024 | 265 |
| Q2 2024 | 311 |
| Q3 2024 | 321 |
| Q4 2024 | 299 |
| Q1 2025 | 278 |
| Q2 2025 | 302 |
| Q3 2025 | 277 |
| Q4 2025 | 335 |
| Q1 2026 | 396 |
| Q2 2026 | 509 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 177 | 148 |
| Q4 2024 | 148 | 162 |
| Q1 2025 | 141 | 151 |
| Q2 2025 | 163 | 130 |
| Q3 2025 | 131 | 161 |
| Q4 2025 | 182 | 136 |
| Q1 2026 | 226 | 158 |
| Q2 2026 | 299 | 208 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $14.0m | $1.7m | 0.12 |
| Q4 2025 | $9.2m | $3.9m | 0.42 |
| Q1 2026 | $33.1m | $19.3m | 0.58 |
| Q2 2026 | $138.4m | $100.9m | 0.73 |
Biggest buyers
| GF FUND MANAGEMENT CO. LTD. | Added | +764.0k |
| TREMBLANT CAPITAL GROUP | New | +713.5k |
| Pictet Asset Management Holding SA | Added | +641.7k |
| WT Asset Management Ltd | New | +534.5k |
| MILLENNIUM MANAGEMENT LLC | Added | +489.9k |
| Capital World Investors | New | +411.0k |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | Added | +408.4k |
| HRT FINANCIAL LP | Added | +385.7k |
| JANE STREET GROUP, LLC | Added | +384.3k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | +345.0k |
Biggest sellers
| BlackRock, Inc. | Reduced | -1.8m |
| EARNEST PARTNERS LLC | Reduced | -1.1m |
| AMERIPRISE FINANCIAL INC | Reduced | -968.4k |
| ALLIANCEBERNSTEIN L.P. | Reduced | -774.5k |
| BANK OF AMERICA CORP /DE/ | Reduced | -697.4k |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | -637.8k |
| REINHART PARTNERS, LLC. | Reduced | -519.8k |
| MORGAN STANLEY | Reduced | -409.0k |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | -354.9k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | Reduced | -352.0k |
Biggest calls
| JANE STREET GROUP, LLC | Added | $61.8m386.7k shares |
| CITADEL ADVISORS LLC | Added | $38.6m241.3k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $16.7m104.5k shares |
| IMC-Chicago, LLC | Added | $6.4m39.8k shares |
| SIMPLEX TRADING, LLC | Added | $5.6m34.9k shares |
| Walleye Trading LLC | Added | $2.0m12.4k shares |
| Point72 Asset Management, L.P. | Added | $1.6m10.2k shares |
| MILLENNIUM MANAGEMENT LLC | New | $1.6m10.1k shares |
| GROUP ONE TRADING LLC | Reduced | $1.6m10.0k shares |
| Squarepoint Ops LLC | Added | $1.5m9.2k shares |
Biggest puts
| JANE STREET GROUP, LLC | Added | $54.2m339.2k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $19.2m120.3k shares |
| CITADEL ADVISORS LLC | Added | $16.2m101.0k shares |
| IMC-Chicago, LLC | Reduced | $7.4m46.0k shares |
| GROUP ONE TRADING LLC | Reduced | $1.2m7.8k shares |
| SIMPLEX TRADING, LLC | Added | $783.7k4.9k shares |
| HRT FINANCIAL LP | New | $767.0k4.8k shares |
| Walleye Trading LLC | Reduced | $335.9k2.1k shares |
| Point72 Asset Management, L.P. | New | $319.9k2.0k shares |
| Walleye Capital LLC | Added | $255.9k1.6k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution filed 2026-07-28 | 12.4% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 7.6% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.2% |
Fell to 5% or below in the last year: EARNEST PARTNERS LLC (4.8%, 2026-08-14), VANGUARD GROUP INC (0.0%, 2026-03-26; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 2 | $619.9k | $498.7k |
| Q1 2025 | 0 | — | 2 | $586.0k | $465.9k |
| Q2 2025 | 0 | — | 2 | $452.9k | $359.2k |
| Q3 2025 | 0 | — | 3 | $363.9k | $136.1k |
| Q4 2025 | 0 | — | 3 | $1.1m | $852.9k |
| Q1 2026 | 0 | — | 9 | $8.8m | $5.4m |
| Q2 2026 | 0 | — | 7 | $7.5m | $4.1m |
| Q3 2026 | 0 | — | 2 | $4.7m | $4.5m |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-09-16 | SLESSOR MIKE CEO, director | Sold plan | $1.8m17.5k shares |
| 2026-09-03 | STEVEN-WAISS KELLEY Director | Sold | $201.8k2.1k shares |
| 2026-08-14 | SLESSOR MIKE CEO, director | Sold plan | $2.1m16.0k shares |
| 2026-07-15 | SLESSOR MIKE CEO, director | Sold plan | $560.2k4.7k shares |
| 2026-06-15 | St Dennis Thomas Director | Sold | $424.2k2.8k shares |
| 2026-06-10 | SLESSOR MIKE CEO, director | Sold plan | $1.4m11.9k shares |
| 2026-06-02 | Rhodes Sheri Director | Sold | $793.5k6.3k shares |
| 2026-05-21 | Obregon-Jimenez Rebeca Director · Restricted Stock Units | Sold | $484.2k3.8k shares |
| 2026-05-20 | WHITE BRIAN C Director | Sold | $409.5k3.2k shares |
| 2026-05-19 | St Dennis Thomas Director | Sold | $115.8k1.0k shares |
| 2026-05-15 | STEVEN-WAISS KELLEY Director | Sold | $678.2k5.4k shares |
| 2026-05-13 | SLESSOR MIKE CEO, director | Sold plan | $1.2m9.4k shares |
| 2026-05-13 | Titinger Jorge Director | Sold | $516.3k4.0k shares |
| 2026-04-15 | SLESSOR MIKE CEO, director | Sold plan | $1.4m11.3k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.02% of their portfolio | 10.5m $1.7bn | Reduced -1.8m |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.04% of their portfolio | 5.2m $838.4m | Reduced -637.8k |
| EARNEST PARTNERS LLC 2.17% of their portfolio | 3.8m $601.9m | Reduced -1.1m |
| VANGUARD CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 3.5m $562.2m | Added +42.8k |
| STATE STREET CORP 0.01% of their portfolio | 2.6m $412.9m | Reduced -346.7k |
| Polar Capital Holdings Plc 0.97% of their portfolio | 2.1m $343.2m | Reduced -146.2k |
| GEODE CAPITAL MANAGEMENT, LLC 0.02% of their portfolio | 1.8m $294.5m | Reduced -354.9k |
| BANK OF AMERICA CORP /DE/ 0.02% of their portfolio | 1.8m $285.3m | Reduced -697.4k |
| PRIMECAP MANAGEMENT CO/CA/ 0.16% of their portfolio | 1.7m $270.3m | Reduced -98.5k |
| Invesco Ltd. 0.02% of their portfolio | 1.6m $252.5m | Added +340.2k |
| ALLIANCEBERNSTEIN L.P. 0.05% of their portfolio | 1.5m $141.3m | Reduced -774.5k |
| DIMENSIONAL FUND ADVISORS LP 0.04% of their portfolio | 1.4m $226.8m | Added +6.8k |
| SEI INVESTMENTS CO 0.19% of their portfolio | 1.3m $214.8m | Reduced -339.3k |
| JANE STREET GROUP, LLC 0.13% of their portfolio | 1.3m $209.5m | Added +384.3k |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.52% of their portfolio | 1.2m $189.5m | Added +47.3k |
| NORGES BANK 0.02% of their portfolio | 1.0m $163.8m | Not comparable |
| MORGAN STANLEY 0.01% of their portfolio | 899.9k $143.9m | Reduced -409.0k |
| GF FUND MANAGEMENT CO. LTD. 1.49% of their portfolio | 776.0k $124.1m | Added +764.0k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.02% of their portfolio | 750.0k $120.0m | Reduced -197.5k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 721.8k $115.4m | Reduced -118.9k |
| TREMBLANT CAPITAL GROUP 3.28% of their portfolio | 713.5k $114.1m | New |
| MILLENNIUM MANAGEMENT LLC 0.07% of their portfolio | 670.9k $107.3m | Added +489.9k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 661.4k $105.8m | Reduced -212.1k |
| Pictet Asset Management Holding SA 0.10% of their portfolio | 654.0k $104.3m | Added +641.7k |
| Bank of New York Mellon Corp 0.02% of their portfolio | 649.3k $103.8m | Added +15.8k |
| Nuveen, LLC 0.02% of their portfolio | 649.3k $103.8m | Reduced -200.4k |
| REINHART PARTNERS, LLC. 2.34% of their portfolio | 639.9k $102.3m | Reduced -519.8k |
| T. Rowe Price Investment Management, Inc. 0.06% of their portfolio | 592.7k $94.8m | Reduced -260.1k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 588.0k $94.0m | Reduced -247.3k |
| NEEDHAM INVESTMENT MANAGEMENT LLC 2.63% of their portfolio | 547.5k $87.6m | Reduced -56.0k |
| WT Asset Management Ltd 1.69% of their portfolio | 534.5k $85.5m | New |
| Assenagon Asset Management S.A. 0.05% of their portfolio | 519.0k $83.0m | Added +96.2k |
| VANGUARD FIDUCIARY TRUST CO 0.02% of their portfolio | 504.2k $80.6m | Reduced -26.5k |
| HRT FINANCIAL LP 0.19% of their portfolio | 489.1k $78.2m | Added +385.7k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 436.0k $69.7m | Reduced -968.4k |
| TWO SIGMA INVESTMENTS, LP 0.05% of their portfolio | 425.7k $68.1m | Added +212.2k |
| D. E. Shaw & Co., Inc. 0.04% of their portfolio | 421.4k $67.4m | Added +178.7k |
| BESSEMER GROUP INC 0.09% of their portfolio | 414.1k $66.2m | Added +22.1k |
| PRINCIPAL FINANCIAL GROUP INC 0.03% of their portfolio | 413.7k $66.2m | Added +35.2k |
| Capital World Investors 0.01% of their portfolio | 411.0k $65.7m | New |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO 0.03% of their portfolio | 408.4k $65.3m | Added +408.4k |
| NATIXIS ADVISORS, LLC 0.07% of their portfolio | 394.0k $63.0m | Reduced -62.2k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.06% of their portfolio | 389.8k $62.3m | Added +345.0k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.02% of their portfolio | 381.3k $61.0m | Reduced -352.0k |
| Connor, Clark & Lunn Investment Management Ltd. 0.11% of their portfolio | 378.1k $60.5m | Added +45.0k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.03% of their portfolio | 376.4k $60.2m | Reduced -132.3k |
| JONES FINANCIAL COMPANIES LLLP 0.02% of their portfolio | 371.3k $48.6m | Reduced -58.7k |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 334.1k $53.4m | Reduced -94.8k |
| Fisher Asset Management, LLC 0.01% of their portfolio | 313.7k $50.2m | Reduced -112.3k |
| UBS Group AG 0.01% of their portfolio | 296.1k $47.4m | Added +95.7k |
| RENAISSANCE TECHNOLOGIES LLC 0.07% of their portfolio | 295.6k $47.3m | New |
| Select Equity Group, L.P. 0.24% of their portfolio | 285.7k $45.7m | Added +28.3k |
| Allspring Global Investments Holdings, LLC 0.06% of their portfolio | 274.2k $40.4m | Added +190.7k |
| Public Sector Pension Investment Board 0.11% of their portfolio | 267.9k $42.8m | Reduced -9.4k |
| TUDOR INVESTMENT CORP ET AL 0.17% of their portfolio | 251.9k $40.3m | Added +110.6k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 250.7k $36.7m | Reduced -14.4k |
| CITADEL ADVISORS LLC 0.02% of their portfolio | 240.3k $38.4m | Added +39.4k |
| NEUBERGER BERMAN GROUP LLC 0.03% of their portfolio | 238.5k $38.1m | Added +230.0k |
| ROYCE & ASSOCIATES LP 0.30% of their portfolio | 234.6k $37.5m | Reduced -217.3k |
| Panview Capital Ltd 6.44% of their portfolio | 228.6k $36.6m | New |
| NOMURA ASSET MANAGEMENT CO LTD 0.08% of their portfolio | 225.0k $36.0m | Reduced -14.9k |
| ENVESTNET ASSET MANAGEMENT INC 0.01% of their portfolio | 220.3k $35.2m | Reduced -60.8k |
| FRANKLIN RESOURCES INC 0.01% of their portfolio | 217.1k $34.7m | Reduced -276.7k |
| AQR CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 214.2k $34.3m | Reduced -796 |
| First Eagle Investment Management, LLC 0.03% of their portfolio | 212.3k $33.9m | Added +32.4k |
| Mawer Investment Management Ltd. 0.22% of their portfolio | 202.8k $32.4m | New |
| MARSHALL WACE, LLP 0.03% of their portfolio | 191.0k $30.5m | Added +91.3k |
| Legal & General Group Plc 0.01% of their portfolio | 181.7k $29.1m | Reduced -3.3k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 180.5k $28.9m | Added +22.7k |
| PINNACLE ASSOCIATES LTD 0.31% of their portfolio | 176.5k $28.2m | Reduced -13.1k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 170.8k $27.3m | Reduced -53.7k |
| FIRST TRUST ADVISORS LP 0.02% of their portfolio | 163.7k $26.2m | Added +63.3k |
| Bridgewater Associates, LP 0.11% of their portfolio | 162.6k $26.0m | Added +112.4k |
| Russell Investments Group, Ltd. 0.02% of their portfolio | 162.5k $25.9m | Added +70.2k |
| Swiss National Bank 0.01% of their portfolio | 156.4k $25.0m | Added +3.0k |
| RHUMBLINE ADVISERS 0.02% of their portfolio | 156.0k $24.9m | Reduced -49.0k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.03% of their portfolio | 150.0k $24.0m | New |
| LOS ANGELES CAPITAL MANAGEMENT LLC 0.09% of their portfolio | 147.5k $23.6m | Added +128.9k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 140.5k $22.5m | Reduced -19.6k |
| PRUDENTIAL FINANCIAL INC 0.02% of their portfolio | 138.5k $22.1m | Reduced -100.3k |
| OBERWEIS ASSET MANAGEMENT INC/ 0.42% of their portfolio | 127.3k $20.4m | New |
| Man Group plc 0.04% of their portfolio | 125.8k $20.1m | Reduced -35.2k |
| FEDERATED HERMES, INC. 0.03% of their portfolio | 124.7k $19.9m | Reduced -75.8k |
| Point72 Asset Management, L.P. 0.03% of their portfolio | 124.5k $19.9m | Added +96.3k |
| Jump Financial, LLC 0.18% of their portfolio | 123.6k $19.8m | Added +63.0k |
| ACADIAN ASSET MANAGEMENT LLC 0.02% of their portfolio | 112.2k $17.9m | Reduced -60.0k |
| BNP PARIBAS FINANCIAL MARKETS 0.01% of their portfolio | 109.1k $17.5m | Reduced -11.7k |
| CANADA LIFE ASSURANCE Co 0.03% of their portfolio | 107.9k $17.3m | Added +20.2k |
| California Public Employees Retirement System 0.01% of their portfolio | 103.7k $16.6m | Reduced -13.3k |
| CITIGROUP INC 0.01% of their portfolio | 97.0k $15.5m | Reduced -57.6k |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.49% of their portfolio | 94.4k $15.1m | Reduced -36.7k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.01% of their portfolio | 92.4k $14.8m | Added +70.6k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 90.5k $14.5m | Added +823 |
| Temasek Holdings (Private) Ltd 0.04% of their portfolio | 88.2k $14.1m | New |
| Weiss Asset Management LP 0.15% of their portfolio | 81.8k $13.1m | Not comparable |
| Balyasny Asset Management L.P. 0.02% of their portfolio | 81.3k $13.0m | Added +66.3k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.02% of their portfolio | 74.8k $12.0m | Added +3.8k |
| Grand Alliance Asset Management Ltd 7.17% of their portfolio | 74.7k $11.9m | New |
| VANGUARD ASSET MANAGEMENT, Ltd 0.01% of their portfolio | 74.4k $11.9m | Added +4.5k |
| Creative Planning 0.01% of their portfolio | 72.7k $11.6m | Added +10.5k |