Ultra Clean Holdings, Inc.
DE ˙ DB ˙ US90385V1070
76,52 € ↓ -4,30 (-5,32%)
2026-06-05
DEL PRIS
SecurityDE:UCE / Ultra Clean Holdings, Inc.
InstitutionAqr Capital Management Llc
ManagerCliff Asness
Latest Disclosed Ownership178,782 shares
Latest Disclosed Value $ 11,116,665
Aqr Capital Management Llc reports 18.24% decrease in ownership of UCE / Ultra Clean Holdings, Inc.

On May 15, 2026 - Aqr Capital Management Llc filed a 13F-HR form disclosing ownership of 178,782 shares of Ultra Clean Holdings, Inc. (DE:UCE) valued at $8,581,536 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 218,663 shares of Ultra Clean Holdings, Inc.. This represents a change in shares of -18.24% during the quarter. The current value of the position is $13,680,399 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 178,782 -39,881 -18.24 11,117 100.72 0.0009
2026-02-17 2025-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 218,663 -18,401 -7.76 5,539 -14.26 0.0029
2025-11-14 2025-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 237,064 34,815 17.21 6,460 41.52 0.0041
2025-08-14 2025-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 202,249 3,458 1.74 4,565 7.24 0.0038
2025-05-15 2025-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 198,791 28,690 16.87 4,256 -30.40 0.0044
2025-02-14 2024-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 170,101 89,051 109.87 6,115 88.97 0.0079
2024-11-14 2024-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 81,050 52,192 180.86 3,236 128.85 0.0045
2024-08-14 2024-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 28,858 9,778 51.25 1,414 61.42 0.0022
2024-05-15 2024-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 19,080 -34,483 -64.38 877 -52.08 0.0015
2024-02-14 2023-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 53,563 -3,802 -6.63 1,829 7.40 0.0034
2023-11-14 2023-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 57,365 11,750 25.76 1,702 -2.96 0.0035
2023-08-14 2023-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 45,615 -10,942 -19.35 1,754 -6.45 0.0037
2023-05-15 2023-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 56,557 244 0.43 1,875 0.48 0.0041
2023-02-14 2022-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 56,313 -23,922 -29.81 1,867 -9.68 0.0043
2022-11-14 2022-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 80,235 42,525 112.77 2,066 83.97 0.0050
2022-08-15 2022-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 37,710 -3,123 -7.65 1,123 -35.12 0.0025
2022-05-16 2022-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 40,833 -8,709 -17.58 1,731 -39.09 0.0033
2022-02-14 2021-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 49,542 -3,823 -7.16 2,842 25.03 0.0052
2021-11-15 2021-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 53,365 -2,964 -5.26 2,273 -24.88 0.0042
2021-08-16 2021-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 56,329 -10,611 -15.85 3,026 -22.11 0.0052
2021-05-17 2021-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 66,940 -37,056 -35.63 3,885 19.94 0.0064
2021-02-16 2020-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 103,996 -37,103 -26.30 3,239 6.97 0.0057
2020-11-16 2020-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 141,099 -44,784 -24.09 3,028 -28.02 0.0051
2020-08-17 2020-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 185,883 25,454 15.87 4,207 90.02 0.0068
2020-05-15 2020-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 160,429 100,715 168.66 2,214 58.03 0.0037
2020-02-14 2019-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 59,714 59,714 1,401 0.0016
2019-02-14 2018-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 0 -13,918 -100.00 0 -100.00
2018-11-15 2018-09-30 13F/A-1 ULTRA CLEAN HLDGS COM 90385V107 13,918 -507,127 -97.33 175 -97.98 0.0002
2018-11-14 2018-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 521,045 0 8,649
2018-08-14 2018-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 521,045 39,028 8.10 8,649 -6.79 0.0087
2018-05-15 2018-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 482,017 -235,540 -32.83 9,279 -43.99 0.0100
2018-02-14 2017-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 717,557 192,112 36.56 16,568 2.98 0.0174
2017-11-14 2017-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 525,445 368,999 235.86 16,089 448.55 0.0192
2017-08-14 2017-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 156,446 43,997 39.13 2,933 54.61 0.0039
2017-05-15 2017-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 112,449 112,449 1,897 0.0025
2016-11-14 2016-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 0 -33,261 -100.00 0 -100.00
2016-08-15 2016-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 33,261 -42,927 -56.34 189 -53.68 0.0003
2016-07-29 2016-03-31 13F/A-1 ULTRA CLEAN HLDGS COM 90385V107 76,188 -56,348 -42.52 408 -39.91 0.0007
2016-05-16 2016-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 76,188 408
2016-02-16 2015-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 132,536 -44,169 -25.00 679 -33.04 0.0012
2015-11-16 2015-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 176,705 -152,555 -46.33 1,014 -50.56 0.0020
2015-08-14 2015-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 329,260 45,704 16.12 2,051 1.13 0.0041
2015-05-15 2015-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 283,556 38,400 15.66 2,028 -10.86 0.0046
2015-04-22 2014-12-31 13F/A-1 ULTRA CLEAN HLDGS COM 90385V107 245,156 101,000 70.06 2,275 76.36 0.0048
2015-02-17 2014-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 245,156 2,275
2014-11-14 2014-09-30 13F ULTRA CLEAN HLDGS COM 90385V107 144,156 82,400 133.43 1,290 130.77 0.0035
2014-08-14 2014-06-30 13F ULTRA CLEAN HLDGS COM 90385V107 61,756 23,800 62.70 559 12.02 0.0015
2014-05-15 2014-03-31 13F ULTRA CLEAN HLDGS COM 90385V107 37,956 27,096 249.50 499 357.80 0.0015
2014-02-14 2013-12-31 13F ULTRA CLEAN HLDGS COM 90385V107 10,860 10,860 109 0.0003
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.