FORM · Formfactor Inc · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Superinvestors Holding FORM
All superinvestors →Holder Concentration
Across 512 13F filersWho Holds FORM
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 511 filers, like-for-like change -4.9%; actively managed books -0.6%; index-like books -12.4%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 46.4% | 276 | -8.1% |
| Exempt adviser | 1.5% | 11 | +138.2% |
| Adviser | 5.3% | 13 | -19.3% |
| Bank | 9.5% | 19 | -17.8% |
| Insurer | 0.8% | 3 | -11.8% |
| Broker-dealer | 0.0% | 3 | +99.4% |
| Benefit plan | 0.3% | 6 | +17.4% |
| Non-US | 2.5% | 12 | -5.1% |
| Holding company | 17.7% | 10 | -15.0% |
| Unknown | 16.0% | 158 | +41.0% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 34.6% | 48 | -12.4% |
| Systematic-like | 4.1% | 35 | +63.5% |
| Concentrated | 2.0% | 88 | +109.9% |
| Diversified active | 59.3% | 340 | -4.8% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 57.5% | 270 | -16.5% |
| Medium turnover | 18.7% | 118 | +18.4% |
| High turnover | 9.0% | 78 | +84.2% |
| Unknown | 14.8% | 45 | -5.7% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 15.4% | 77 | +6.1% |
| Medium horizon | 19.2% | 79 | -7.4% |
| Long horizon | 61.5% | 316 | -10.4% |
| Unknown | 3.9% | 39 | +178.3% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 1.1% | 125 | +38.6% |
| $1B to $10B | 7.0% | 160 | +60.3% |
| $10B to $100B | 20.3% | 147 | -1.5% |
| $100B or more | 71.6% | 79 | -10.0% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.6% | 144 | -3.0% |
| Pooled investment vehicles | 8.4% | 42 | +32.5% |
| Registered funds and BDCs | 25.2% | 39 | -10.7% |
| Pension and profit sharing plans | 0.0% | 3 | +10.0% |
| Insurance companies | 0.1% | 4 | -13.2% |
| Charitable organizations | 0.0% | 1 | +400.0% |
| Governments and sovereign funds | 0.5% | 8 | -35.3% |
| Corporations | 0.0% | 3 | +6796.7% |
| Other investment advisers | 0.1% | 7 | +16.3% |
| Other | 0.1% | 1 | -1.1% |
| Diversified | 10.4% | 24 | -21.1% |
| Unknown | 53.6% | 235 | -1.9% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 11.8% | 72 | +35.7% |
| Private equity funds | 0.3% | 17 | -62.9% |
| Venture capital funds | 0.0% | 1 | -13.3% |
| Real estate funds | 0.0% | 6 | +24.0% |
| Liquidity funds | 0.0% | 2 | -23.8% |
| Securitized asset funds | 0.3% | 1 | +14.4% |
| Other private funds | 10.0% | 26 | -15.4% |
| Mixed private funds | 2.0% | 3 | -34.4% |
| Private funds, type not stated | 0.6% | 8 | -44.6% |
| No private funds | 22.9% | 151 | -9.8% |
| Unknown | 52.1% | 224 | -3.6% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 86.7% | 417 | -8.7% |
| Outside the US | 13.3% | 94 | +36.5% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 6 holders with no observed 2026-03-31 13F and 5 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
511 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 28.8% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies FORM's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | AEIS Advanced Energy Industries Inc | 24 |
| 2 | LASR Nlight, Inc. | 13 |
| 3 | SITM SITIME Corp | 18 |
| 4 | VIAV Viavi Solutions Inc. | 16 |
| 5 | TTMI Ttm Technologies Inc | 20 |
| 6 | MOD Modine Manufacturing Co | 20 |
| 7 | MYRG Myr Group Inc. | 13 |
| 8 | VSAT Viasat Inc | 13 |
| 9 | KLIC Kulicke & Soffa Industries Inc | 11 |
| 10 | DGII Digi International Inc | 7 |
Shareholder Targets
13F filers that own its peers but not FORM, quarter ended Jun 30, 2026Found through its holder-overlap peers: AEIS, LASR, SITM, VIAV, TTMI, MOD, MYRG, VSAT, KLIC, DGII, AIP, COHU, SMTC, ONTO, FN, MXL, BHE, UCTT, LITE, SPXC. 1,748 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active | $2,271,056,786 17 held | TTMI, SMTC, MOD |
| 2 | Whale Rock Capital Management LLC Registered adviser, Diversified active | $1,956,182,114 4 held | TTMI, FN, SITM |
| 3 | Capital Research Global Investors Adviser, Diversified active | $1,287,815,449 5 held | SMTC, MOD, LITE |
| 4 | Artisan Partners Limited Partnership Registered adviser, Diversified active | $1,154,108,767 8 held | SITM, MOD, SMTC |
| 5 | Driehaus Capital Management LLC Registered adviser, Diversified active | $1,124,253,067 13 held | UCTT, LASR, ONTO |
| 6 | Capital International Investors Adviser, Diversified active | $1,108,333,858 6 held | SPXC, FN, KLIC |
| 7 | SCHRODER INVESTMENT MANAGEMENT GROUP Registered adviser, Diversified active | $767,749,829 7 held | LITE, VIAV, SMTC |
| 8 | GW&K Investment Management, LLC Registered adviser, Diversified active | $673,657,547 10 held | AEIS, SPXC, FN |
| 9 | Analog Century Management LP Registered adviser, Diversified active | $640,456,197 6 held | ONTO, AEIS, TTMI |
| 10 | Value Aligned Research Advisors, LLC Registered adviser, Diversified active | $630,405,527 1 held | LITE |
Fund Ownership of FORM by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 28.74% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 4.82% | 3,762,979 |
| Index ETFs | 23.92% | 18,686,750 |
| Active ETFs | 0.82% | 644,330 |
| Active funds | 13.63% | 10,651,668 |
| Unclassified | 0.24% | 185,883 |
| All registered funds | 43.43% | 33,931,610 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $1,676,771,521 | 14.36% | 10,484,409 | Shares | 2026-08-07 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $838,385,525 | 7.18% | 5,242,203 | Shares | 2026-08-13 | |
| Large EARNEST PARTNERS LLC Registered adviser | $601,850,815 | 5.15% | 3,763,214 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $562,194,572 | 4.81% | 3,515,254 | Shares | 2026-08-13 | |
| Mega STATE STREET CORP Bank | $412,855,616 | 3.54% | 2,581,477 | Shares | 2026-09-22 | |
| Large Polar Capital Holdings Plc Registered adviser | $343,225,453 | 2.94% | 2,146,098 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $293,151,849 | 2.51% | 1,833,001 | Shares | 2026-08-12 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $285,257,223 | 2.44% | 1,783,638 | Shares | 2026-08-14 | |
| Mega PRIMECAP MANAGEMENT CO/CA/ Registered adviser | $270,299,932 | 2.31% | 1,690,114 | Shares | 2026-08-14 | |
| Mega Invesco Ltd. Adviser | $252,454,780 | 2.16% | 1,578,533 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $233,027,605 | 2.00% | 1,457,060 | Shares | 2026-08-14 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $226,926,274 | 1.94% | 1,418,910 | Shares | 2026-08-11 | |
| Mega SEI INVESTMENTS CO | $214,794,945 | 1.84% | 1,343,056 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $209,487,988 | 1.79% | 1,309,873 | Shares | 2026-08-14 | |
| Large FULLER & THALER ASSET MANAGEMENT, INC. Registered adviser | $189,454,837 | 1.62% | 1,184,611 | Shares | 2026-08-12 | |
| Mega NORGES BANK Non-US | $163,775,196 | 1.40% | 1,024,043 | Shares | 2026-08-12 | |
| Mega MORGAN STANLEY Holding company | $143,928,518 | 1.23% | 899,947 | Shares | 2026-08-13 | |
| Mid GF FUND MANAGEMENT CO. LTD. | $124,105,680 | 1.06% | 776,000 | Shares | 2026-08-07 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $119,951,818 | 1.03% | 750,027 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $115,430,116 | 0.99% | 721,754 | Shares | 2026-08-14 | |
| Mid TREMBLANT CAPITAL GROUP | $114,102,058 | 0.98% | 713,450 | Shares | 2026-08-14 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $107,291,759 | 0.92% | 670,867 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $105,777,540 | 0.91% | 661,399 | Shares | 2026-08-14 | |
| Mega Pictet Asset Management Holding SA | $104,594,060 | 0.90% | 653,999 | Shares | 2026-07-30 | |
| Mega Bank of New York Mellon Corp Bank | $103,843,663 | 0.89% | 649,307 | Shares | 2026-08-06 | |
| Mega Nuveen, LLC | $103,841,428 | 0.89% | 649,293 | Shares | 2026-08-11 | |
| Mid REINHART PARTNERS, LLC. Registered adviser | $98,494,879 | 0.84% | 659,667 | Shares | 2026-10-09 | |
| Mega T. Rowe Price Investment Management, Inc. Adviser | $94,797,867 | 0.81% | 592,746 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $94,041,715 | 0.81% | 588,018 | Shares | 2026-08-13 | |
| Mid NEEDHAM INVESTMENT MANAGEMENT LLC Registered adviser | $87,561,675 | 0.75% | 547,500 | Shares | 2026-08-14 | |
| Mid WT Asset Management Ltd Exempt adviser | $85,481,305 | 0.73% | 534,492 | Shares | 2026-08-07 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $80,642,303 | 0.69% | 504,235 | Shares | 2026-08-13 | |
| Large HRT FINANCIAL LP | $78,216,165 | 0.67% | 489,065 | Shares | 2026-08-14 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $69,722,440 | 0.60% | 435,956 | Shares | 2026-08-14 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $68,080,281 | 0.58% | 425,688 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $67,390,823 | 0.58% | 421,377 | Shares | 2026-08-14 | |
| Large BESSEMER GROUP INC | $66,225,410 | 0.57% | 414,090 | Shares | 2026-08-12 | |
| Mega PRINCIPAL FINANCIAL GROUP INC Insurer | $66,161,441 | 0.57% | 413,690 | Shares | 2026-08-04 | |
| Mega Capital World Investors Adviser | $65,736,027 | 0.56% | 411,030 | Shares | 2026-08-12 | |
| Mega NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | $65,319,890 | 0.56% | 408,428 | Shares | 2026-08-12 | |
| Large NATIXIS ADVISORS, LLC Registered adviser | $63,010,340 | 0.54% | 393,987 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $62,344,872 | 0.53% | 389,826 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $61,844,931 | 0.53% | 386,700 | Call | 2026-08-14 | |
| Mega MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Registered adviser | $60,984,506 | 0.52% | 381,320 | Shares | 2026-08-03 | |
| Large Connor, Clark & Lunn Investment Management Ltd. Registered adviser | $60,465,534 | 0.52% | 378,075 | Shares | 2026-08-13 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Registered adviser | $60,193,813 | 0.52% | 376,376 | Shares | 2026-08-13 | |
| Mega JONES FINANCIAL COMPANIES LLLP | $59,385,687 | 0.51% | 371,323 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $54,248,256 | 0.46% | 339,200 | Put | 2026-08-14 | |
| Mega ROYAL BANK OF CANADA Bank | $53,428,133 | 0.46% | 334,072 | Shares | 2026-08-14 | |
| Mega Fisher Asset Management, LLC Adviser | $50,162,364 | 0.43% | 313,652 | Shares | 2026-08-04 | |
| Mega UBS Group AG Bank | $47,355,591 | 0.41% | 296,102 | Shares | 2026-08-13 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $47,270,190 | 0.40% | 295,568 | Shares | 2026-08-13 | |
| Large Select Equity Group, L.P. Registered adviser | $45,689,761 | 0.39% | 285,686 | Shares | 2026-08-14 | |
| Large Allspring Global Investments Holdings, LLC Holding company | $43,860,802 | 0.38% | 274,250 | Shares | 2026-08-13 | |
| Large Public Sector Pension Investment Board Non-US | $42,840,129 | 0.37% | 267,868 | Shares | 2026-08-13 | |
| Large TUDOR INVESTMENT CORP ET AL Registered adviser | $40,287,166 | 0.35% | 251,905 | Shares | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $40,094,448 | 0.34% | 250,700 | Shares | 2026-08-12 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $38,591,109 | 0.33% | 241,300 | Call | 2026-09-02 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $38,427,340 | 0.33% | 240,276 | Shares | 2026-09-02 | |
| Mega NEUBERGER BERMAN GROUP LLC Holding company | $38,148,422 | 0.33% | 238,532 | Shares | 2026-08-13 | |
| Large ROYCE & ASSOCIATES LP Registered adviser | $37,512,541 | 0.32% | 234,556 | Shares | 2026-08-14 | |
| Small Panview Capital Ltd Exempt adviser | $36,567,514 | 0.31% | 228,647 | Shares | 2026-08-13 | |
| Large NOMURA ASSET MANAGEMENT CO LTD Registered adviser | $35,981,051 | 0.31% | 224,980 | Shares | 2026-08-13 | |
| Mega ENVESTNET ASSET MANAGEMENT INC Registered adviser | $35,235,617 | 0.30% | 220,319 | Shares | 2026-09-23 | |
| Mega FRANKLIN RESOURCES INC Adviser | $34,714,883 | 0.30% | 217,063 | Shares | 2026-08-13 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $34,259,722 | 0.29% | 214,217 | Shares | 2026-08-14 | |
| Large Mawer Investment Management Ltd. Registered adviser | $32,437,642 | 0.28% | 202,824 | Shares | 2026-08-07 | |
| Large MARSHALL WACE, LLP Exempt adviser | $30,548,228 | 0.26% | 191,010 | Shares | 2026-08-13 | |
| Mega Legal & General Group Plc | $29,066,476 | 0.25% | 181,745 | Shares | 2026-08-14 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $28,863,842 | 0.25% | 180,478 | Shares | 2026-08-13 | |
| Mid PINNACLE ASSOCIATES LTD Registered adviser | $28,268,414 | 0.24% | 189,327 | Shares | 2026-10-20 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $27,323,079 | 0.23% | 170,844 | Shares | 2026-08-14 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $26,181,500 | 0.22% | 163,706 | Shares | 2026-08-11 | |
| Large Bridgewater Associates, LP Registered adviser | $26,003,338 | 0.22% | 162,592 | Shares | 2026-08-14 | |
| Mega Russell Investments Group, Ltd. | $25,982,865 | 0.22% | 162,464 | Shares | 2026-08-06 | |
| Mega Swiss National Bank | $25,013,052 | 0.21% | 156,400 | Shares | 2026-08-11 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $24,947,960 | 0.21% | 155,993 | Shares | 2026-08-12 | |
| Large ADAGE CAPITAL PARTNERS GP, L.L.C. Registered adviser | $23,989,500 | 0.21% | 150,000 | Shares | 2026-08-14 | |
| Large LOS ANGELES CAPITAL MANAGEMENT LLC Registered adviser | $23,586,476 | 0.20% | 147,480 | Shares | 2026-08-13 | |
| Mega DEUTSCHE BANK AG\ Non-US | $22,471,601 | 0.19% | 140,509 | Shares | 2026-08-07 | |
| Large PRUDENTIAL FINANCIAL INC Insurer | $22,145,027 | 0.19% | 138,467 | Shares | 2026-08-12 | |
| Mid OBERWEIS ASSET MANAGEMENT INC/ Registered adviser | $20,363,886 | 0.17% | 127,330 | Shares | 2026-08-14 | |
| Large Man Group plc | $20,123,671 | 0.17% | 125,828 | Shares | 2026-08-14 | |
| Large FEDERATED HERMES, INC. Adviser | $19,944,708 | 0.17% | 124,709 | Shares | 2026-08-12 | |
| Large Point72 Asset Management, L.P. Registered adviser | $19,906,806 | 0.17% | 124,472 | Shares | 2026-08-14 | |
| Mid Jump Financial, LLC | $19,774,544 | 0.17% | 123,645 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $19,239,579 | 0.16% | 120,300 | Put | 2026-08-14 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $17,941,906 | 0.15% | 112,186 | Shares | 2026-08-13 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $17,450,602 | 0.15% | 109,114 | Shares | 2026-08-13 | |
| Large CANADA LIFE ASSURANCE Co | $17,256,926 | 0.15% | 107,903 | Shares | 2026-08-13 | |
| Large First Eagle Investment Management, LLC Registered adviser | $16,974,490 | 0.15% | 106,137 | Shares | 2026-08-24 | |
| Mega Allianz Asset Management GmbH | $16,805,603 | 0.14% | 105,081 | Shares | 2026-09-02 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $16,712,685 | 0.14% | 104,500 | Call | 2026-08-14 | |
| Mega California Public Employees Retirement System | $16,585,220 | 0.14% | 103,703 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $16,152,930 | 0.14% | 101,000 | Put | 2026-09-02 | |
| Mega CITIGROUP INC Bank | $15,510,650 | 0.13% | 96,984 | Shares | 2026-08-03 | |
| Mid PEREGRINE CAPITAL MANAGEMENT LLC Registered adviser | $15,100,590 | 0.13% | 94,420 | Shares | 2026-07-17 | |
| Mega CANADA PENSION PLAN INVESTMENT BOARD Non-US | $14,777,532 | 0.13% | 92,400 | Shares | 2026-08-14 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $14,465,988 | 0.12% | 90,452 | Shares | 2026-08-24 | |
| Large Temasek Holdings (Private) Ltd Holding company | $14,105,346 | 0.12% | 88,197 | Shares | 2026-08-07 |
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