Ultra Clean Holdings, Inc. (UCTT) Ownership
UCTT ownership summary
as of October 18, 2026- Institutions
- 109.9% of shares outstanding
- Insiders
- 1.93% of shares outstanding
- Shares outstanding
- 45.3M
- Float
- 44.3M shares available to trade
- Short interest
- 11.02% 3.7M shares short
- Days to cover
- 4.36 short interest up 2.6% vs prior month
- Institutions 109.87%
- Insiders 1.93%
UCTT top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 15.28% | 6.9M | $352.9M | +87,373 (+1.3%) | June 30, 2026 |
| 2 | Amvescap Plc. | 6.90% | 3.1M | $159.4M | +1.5M (+88.2%) | June 30, 2026 |
| 3 | Vanguard Portfolio Management, LLC | 6.09% | 2.8M | $140.6M | −44,812 (−1.6%) | June 30, 2026 |
| 4 | Capital World Investors | 5.70% | 2.6M | $131.6M | +2.6M (0.0%) | June 30, 2026 |
| 5 | Vanguard Capital Management, LLC | 4.22% | 1.9M | $97.4M | −7,475 (−0.4%) | June 30, 2026 |
| 6 | State Street Corp | 3.98% | 1.8M | $91.9M | −35,563 (−1.9%) | June 30, 2026 |
| 7 | Boston Partners Global Investors, Inc | 3.00% | 1.4M | $69.4M | −108,667 (−7.4%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 2.91% | 1.3M | $67.2M | +176,851 (+15.5%) | June 30, 2026 |
| 9 | Driehaus Capital Management LLC | 2.89% | 1.3M | $66.8M | +246,826 (+23.2%) | June 30, 2026 |
| 10 | Dimensional Fund Advisors, Inc. | 2.10% | 949K | $48.4M | −62,424 (−6.2%) | June 30, 2026 |
| 11 | AllianceBernstein L.P. | 1.75% | 794K | $40.5M | +736,754 (+1,288.4%) | June 30, 2026 |
| 12 | Charles Schwab Investment Management Inc | 1.63% | 740K | $37.7M | −100,489 (−12.0%) | June 30, 2026 |
| 13 | Arnhold & S. Bleichroeder Advisers, LLC | 1.54% | 696K | $35.5M | +261,760 (+60.3%) | June 30, 2026 |
| 14 | Frontier Capital Management CO Inc | 1.47% | 668K | $34.0M | −1.1M (−62.7%) | June 30, 2026 |
| 15 | Royce & Associates, LP | 1.47% | 666K | $34.0M | −93,001 (−12.2%) | June 30, 2026 |
| 16 | Oberweis Asset Management Inc | 1.43% | 647K | $33.0M | +6,800 (+1.1%) | June 30, 2026 |
| 17 | Delaware Management Holdings Inc | 1.38% | 624K | $31.8M | +211,329 (+51.2%) | June 30, 2026 |
| 18 | D. E. Shaw & Co LP | 1.37% | 620K | $31.6M | −563,455 (−47.6%) | June 30, 2026 |
| 19 | Two Sigma Investments LLC | 1.35% | 610K | $31.1M | +28,720 (+4.9%) | June 30, 2026 |
| 20 | Paradigm Capital Management, Inc. | 1.34% | 608K | $31.0M | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 10 holders added 5.8M shares and 9 cut 2.1M.
UCTT top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 5.95% | 2.7M | $137.5M | +606 (+0.0%) | September 30, 2026 |
| 2 | American Funds SMALLCAP World A | 5.26% | 2.4M | $121.5M | — | September 30, 2026 |
| 3 | Invesco Small Cap Value A | 3.01% | 1.4M | $69.5M | −456,681 (−25.1%) | August 31, 2026 |
| 4 | Vanguard MStar Total Stk Mkt Idx Invest | 2.99% | 1.4M | $69.0M | −1,768 (−0.1%) | August 31, 2026 |
| 5 | iShares Russell 2000 ETF | 2.57% | 1.2M | $59.4M | −13,440 (−1.1%) | September 30, 2026 |
| 6 | Vanguard Information Technology ETF | 2.51% | 1.1M | $58.0M | +2,622 (+0.2%) | September 30, 2026 |
| 7 | Invesco Semiconductors ETF | 2.12% | 958K | $48.8M | — | September 30, 2026 |
| 8 | Oberweis Micro-Cap | 1.37% | 621K | $31.7M | +8,000 (+1.3%) | June 30, 2026 |
| 9 | Nomura Small Cap Core I | 1.10% | 499K | $25.5M | — | August 31, 2026 |
| 10 | Fidelity Small Cap Index | 1.09% | 492K | $25.1M | +4,249 (+0.9%) | July 31, 2026 |
| 11 | AB Small Cap Growth A | 1.04% | 469K | $23.9M | +114,379 (+32.3%) | August 31, 2026 |
| 12 | iShares Russell 2000 Growth ETF | 0.93% | 421K | $21.5M | −533 (−0.1%) | September 30, 2026 |
| 13 | State Street SPDR Port S&P 600 Sm CpETF | 0.91% | 411K | $21.0M | — | September 30, 2026 |
| 14 | Invesco S&P SmallCap Momentum ETF | 0.91% | 411K | $21.0M | — | September 30, 2026 |
| 15 | iShares S&P Small-Cap 600 Value ETF | 0.85% | 383K | $19.5M | — | September 30, 2026 |
| 16 | Column Small Cap Select | 0.80% | 362K | $18.4M | +43,203 (+13.6%) | September 30, 2026 |
| 17 | Vanguard Strategic Equity Inv | 0.72% | 327K | $16.7M | −70,344 (−17.7%) | June 30, 2026 |
| 18 | FullerThaler Behavioral Sm-Cp Gr R6 | 0.68% | 306K | $15.6M | +306,400 (0.0%) | March 31, 2026 |
| 19 | Vanguard Tax-Managed Small Cap Adm | 0.67% | 303K | $15.5M | −1,610 (−0.5%) | September 30, 2026 |
| 20 | Vanguard Russell 2000 ETF | 0.58% | 262K | $13.3M | +2,926 (+1.1%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
UCTT insider transactions
latest 19| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-01-13 | Ro Khanna | Sell | $37.59 | — | — |
| 2026-01-06 | Ro Khanna | Sell | $31.75 | — | — |
| 2025-12-03 | David T Ibnale | Sell | $26.63 | 23,500 | $625,805 |
| 2025-11-21 | Ro Khanna | Sell | $22.27 | — | — |
| 2025-11-19 | Ro Khanna | Sell | $22.16 | — | — |
| 2025-11-12 | Ro Khanna | Sell | $26.00 | — | — |
| 2025-11-05 | Ro Khanna | Sell | $26.91 | — | — |
| 2025-10-24 | Ro Khanna | Sell | $29.99 | — | — |
| 2025-10-23 | Ro Khanna | Sell | $29.88 | — | — |
| 2025-10-15 | Ro Khanna | Sell | $29.42 | — | — |
| 2025-10-14 | Ro Khanna | Sell | $27.98 | — | — |
| 2025-10-14 | Ro Khanna | Sell | $27.98 | — | — |
| 2025-07-10 | Ro Khanna | Buy | $25.02 | — | — |
| 2025-06-26 | Ro Khanna | Sell | $22.62 | — | — |
| 2025-06-06 | Paul Yoonku Cho | Sell | $21.06 | 4,084 | $86,009 |
| 2025-06-04 | Jeffrey L Mckibben | Sell | $20.87 | 6,294 | $131,356 |
| 2025-05-13 | Ro Khanna | Buy | $22.66 | — | — |
| 2025-05-12 | Ro Khanna | Buy | $22.24 | — | — |
| 2025-05-06 | Jamie J Palfrey | Sell | $19.20 | 9,500 | $182,400 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
UCTT shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns UCTT
Institutional investors own 109.9% of Ultra Clean's shares and insiders 1.93%. The largest holder is BlackRock Inc with 15.28% of the shares (6.9M), as of June 30, 2026. Among the top 20 institutions, 10 added shares and 9 reduced their stake in the latest filings. Short interest is 11.02% of the float, or 4.36 days of average trading volume. The share count rose 51.3% since 2014.
Related: UCTT analyst forecast, UCTT key metrics. See the UCTT stock overview for the latest quote and news.
UCTT ownership FAQ
Who owns the most Ultra Clean stock?
The largest shareholders of Ultra Clean are BlackRock Inc (15.28%), Amvescap Plc. (6.90%), Vanguard Portfolio Management, LLC (6.09%), Capital World Investors (5.70%), Vanguard Capital Management, LLC (4.22%).
What percentage of Ultra Clean is owned by institutions?
Institutions hold 109.9% of Ultra Clean's shares outstanding; insiders hold 1.93%.
Which funds own Ultra Clean?
The largest fund holders of Ultra Clean are iShares Core S&P Small-Cap ETF (5.95%), American Funds SMALLCAP World A (5.26%), Invesco Small Cap Value A (3.01%), Vanguard MStar Total Stk Mkt Idx Invest (2.99%), iShares Russell 2000 ETF (2.57%).
What is Ultra Clean's short interest?
3.7M shares of Ultra Clean were sold short, 11.02% of the float; at the average daily volume it would take 4.36 days to cover.
Are insiders buying or selling Ultra Clean?
Of the latest 19 reported insider transactions in Ultra Clean (since May 6, 2025), 3 were purchases and 16 were sales.
How many shares of Ultra Clean are outstanding?
Ultra Clean has 45.3M shares outstanding, of which 44.3M are in the public float.