Who owns Ultra Clean Holdings (UCTT)
Which tracked institutional funds hold UCTT, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See UCTT company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on UCTT is one-sided between 2025-Q4 and 2026-Q1: 179 added or opened and 21 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
UCTT’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in UCTT divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 330 tracked filers holding UCTT, 210 increased or opened the position and 110 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in UCTT between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 60
- VANGUARD PORTFOLIO MANAGEMENT LLC$174M
- VANGUARD CAPITAL MANAGEMENT LLC$119M
- Boston Partners$91M
- COOPER CREEK PARTNERS MANAGEMENT LLC$36M
- TWO SIGMA INVESTMENTS, LP$36M
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$26M
Full exits 10
- VANGUARD GROUP INC$126M
- SHAPIRO CAPITAL MANAGEMENT LLC$32M
- Qube Research & Technologies Ltd$5M
- COMERICA BANK$4M
- WEDGE CAPITAL MANAGEMENT L L P/NC$3M
- RENAISSANCE TECHNOLOGIES LLC$3M
Largest adds
- BlackRock, Inc.$136M
- STATE STREET CORP$67M
- Driehaus Capital Management LLC$55M
- D. E. Shaw & Co., Inc.$49M
- GEODE CAPITAL MANAGEMENT, LLC$43M
- MORGAN STANLEY$34M
Largest trims
- VOLORIDGE INVESTMENT MANAGEMENT, LLC$3M
- CANADA PENSION PLAN INVESTMENT BOARD$3M
- AWM Investment Company, Inc.$3M
- Man Group plc$2M
- HARBOR CAPITAL ADVISORS, INC.$2M
- NEEDHAM INVESTMENT MANAGEMENT LLC$1M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 6,919,992 | $987M | 22.4% | 2026-Q2 |
| Invesco Ltd. added | 3,124,839 | $446M | 10.1% | 2026-Q2 |
| Capital World Investors new | 2,580,132 | $368M | 8.3% | 2026-Q2 |
| STATE STREET CORP trimmed | 1,802,261 | $257M | 5.8% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 2,802,250 | $174M | 3.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,916,501 | $119M | 2.7% | 2026-Q1 |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 1,787,451 | $111M | 2.5% | 2026-Q1 |
| Boston Partners added | 1,468,878 | $91M | 2.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 619,802 | $88M | 2.0% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 609,851 | $87M | 2.0% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,140,780 | $71M | 1.6% | 2026-Q1 |
| Driehaus Capital Management LLC added | 1,062,376 | $66M | 1.5% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,011,778 | $63M | 1.4% | 2026-Q1 |
| MORGAN STANLEY added | 911,700 | $57M | 1.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 388,205 | $55M | 1.3% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 840,456 | $52M | 1.2% | 2026-Q1 |
| First Eagle Investment Management, LLC trimmed | 347,930 | $50M | 1.1% | 2026-Q2 |
| ROYCE & ASSOCIATES LP trimmed | 759,497 | $47M | 1.1% | 2026-Q1 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 640,476 | $40M | 0.9% | 2026-Q1 |
| PARADIGM CAPITAL MANAGEMENT INC/NY | 608,200 | $38M | 0.9% | 2026-Q1 |
| COOPER CREEK PARTNERS MANAGEMENT LLC new | 586,773 | $36M | 0.8% | 2026-Q1 |
| SG Americas Securities, LLC added | 565,569 | $35M | 0.8% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 503,328 | $31M | 0.7% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 210,149 | $30M | 0.7% | 2026-Q2 |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 475,073 | $30M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 458,142 | $28M | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 454,020 | $28M | 0.6% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 443,653 | $28M | 0.6% | 2026-Q1 |
| PINNACLE ASSOCIATES LTD trimmed | 441,659 | $27M | 0.6% | 2026-Q1 |
| Divisar Capital Management LLC trimmed | 420,049 | $26M | 0.6% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. new | 412,699 | $26M | 0.6% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 359,945 | $22M | 0.5% | 2026-Q1 |
| UBS Group AG added | 351,296 | $22M | 0.5% | 2026-Q1 |
| ION Fund Management Ltd new | 349,852 | $22M | 0.5% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 144,176 | $21M | 0.5% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 323,876 | $20M | 0.5% | 2026-Q1 |
| Goodman Financial Corp trimmed | 311,104 | $19M | 0.4% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 309,703 | $19M | 0.4% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 336,363 | $19M | 0.4% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 292,790 | $18M | 0.4% | 2026-Q1 |
| NEXT CENTURY GROWTH INVESTORS LLC new | 280,543 | $17M | 0.4% | 2026-Q1 |
| Public Sector Pension Investment Board added | 277,351 | $17M | 0.4% | 2026-Q1 |
| MetLife Investment Management, LLC added | 267,871 | $17M | 0.4% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 252,367 | $16M | 0.4% | 2026-Q1 |
| Dana Investment Advisors, Inc. trimmed | 249,436 | $16M | 0.4% | 2026-Q1 |
| LOOMIS SAYLES & CO L P new | 231,058 | $14M | 0.3% | 2026-Q1 |
| CITIGROUP INC added | 227,504 | $14M | 0.3% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 221,486 | $14M | 0.3% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 220,650 | $14M | 0.3% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 91,900 | $13M | 0.3% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 82,499 | $12M | 0.3% | 2026-Q2 |
| G2 Investment Partners Management LLC new | 180,941 | $11M | 0.3% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 172,106 | $11M | 0.2% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 171,602 | $11M | 0.2% | 2026-Q1 |
| SG Capital Management LLC new | 165,185 | $10M | 0.2% | 2026-Q1 |
| Redwood Grove Capital, LLC new | 162,358 | $10M | 0.2% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC added | 158,256 | $10M | 0.2% | 2026-Q1 |
| Brevan Howard Capital Management LP added | 68,707 | $10M | 0.2% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 62,439 | $9M | 0.2% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 141,434 | $9M | 0.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 60,820 | $9M | 0.2% | 2026-Q2 |
| TORONTO DOMINION BANK added | 129,863 | $8M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 127,703 | $8M | 0.2% | 2026-Q1 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC new | 125,924 | $8M | 0.2% | 2026-Q1 |
| FIRST SABREPOINT CAPITAL MANAGEMENT LP new | 125,000 | $8M | 0.2% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP new | 53,796 | $8M | 0.2% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 123,171 | $8M | 0.2% | 2026-Q1 |
| Tyro Capital Management LLC new | 119,133 | $7M | 0.2% | 2026-Q1 |
| BARCLAYS PLC added | 112,679 | $7M | 0.2% | 2026-Q1 |
| GRACE & WHITE INC /NY trimmed | 109,950 | $7M | 0.2% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 106,209 | $7M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 104,585 | $7M | 0.1% | 2026-Q1 |
| WINTON GROUP Ltd added | 104,240 | $6M | 0.1% | 2026-Q1 |
| Legal & General Group Plc trimmed | 103,810 | $6M | 0.1% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 44,249 | $6M | 0.1% | 2026-Q2 |
| CASTLEARK MANAGEMENT LLC new | 100,130 | $6M | 0.1% | 2026-Q1 |
| Divisadero Street Capital Management, LP new | 100,000 | $6M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 98,389 | $6M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 97,466 | $6M | 0.1% | 2026-Q1 |
| ExodusPoint Capital Management, LP trimmed | 41,767 | $6M | 0.1% | 2026-Q2 |
| CRAMER ROSENTHAL MCGLYNN LLC new | 94,265 | $6M | 0.1% | 2026-Q1 |
| Nuveen, LLC added | 93,871 | $6M | 0.1% | 2026-Q1 |
| Calamos Advisors LLC new | 89,869 | $6M | 0.1% | 2026-Q1 |
| Swiss National Bank added | 89,800 | $6M | 0.1% | 2026-Q1 |
| Walleye Capital LLC added | 87,453 | $5M | 0.1% | 2026-Q1 |
| FIFTH THIRD BANCORP added | 84,470 | $5M | 0.1% | 2026-Q1 |
| Bridge City Capital, LLC added | 81,226 | $5M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 77,983 | $5M | 0.1% | 2026-Q1 |
| 4D Advisors, LLC trimmed | 75,000 | $5M | 0.1% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ added | 67,217 | $4M | 0.1% | 2026-Q1 |
| Atom Investors LP new | 66,453 | $4M | 0.1% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 65,889 | $4M | 0.1% | 2026-Q1 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 60,000 | $4M | 0.1% | 2026-Q1 |
| Lisanti Capital Growth, LLC new | 59,835 | $4M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 4,990,724 | $126M | 2.9% | 2025-Q4 stale |
| SHAPIRO CAPITAL MANAGEMENT LLC trimmed | 1,278,492 | $32M | 0.7% | 2025-Q4 stale |
| Qube Research & Technologies Ltd added | 184,783 | $5M | 0.1% | 2025-Q4 stale |
| COMERICA BANK trimmed | 175,307 | $4M | 0.1% | 2025-Q4 stale |
| Jain Global LLC added | 195,058 | $4M | 0.1% | 2025-Q1 stale |
| Cubist Systematic Strategies, LLC trimmed | 147,967 | $4M | 0.1% | 2025-Q3 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.