ULTRA CLEAN HLDGS INC

Ticker: UCTT CUSIP: 90385V107 Class: Common Stock

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM's Holding History (CIK: 0001081019)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 41,559 Value ($000) $1,053 Avg Close $26.60 Range $21.49 - $31.11

Q3 2025

Shares 41,591 Value ($000) $1,133 Avg Close $24.59 Range $21.28 - $29.72

Q2 2025

Shares 38,809 Value ($000) $876 Avg Close $20.53 Range $16.66 - $23.22

Q1 2025

Shares 42,046 Value ($000) $900 Avg Close $31.93 Range $20.86 - $40.10

Q4 2024

Shares 42,046 Value ($000) $1,512 Avg Close $36.98 Range $32.08 - $41.84

Q3 2024

Shares 42,441 Value ($000) $1,695 Avg Close $41.01 Range $32.33 - $56.47

Q2 2024

Shares 43,534 Value ($000) $2,133 Avg Close $44.88 Range $38.16 - $50.51

Q1 2024

Shares 44,989 Value ($000) $2,067 Avg Close $40.62 Range $31.01 - $49.25

Q4 2023

Shares 47,686 Value ($000) $1,628 Avg Close $27.80 Range $22.15 - $35.54

Q3 2023

Shares 49,313 Value ($000) $1,463 Avg Close $33.70 Range $28.04 - $40.80

Q2 2023

Shares 54,214 Value ($000) $2,085 Avg Close $32.18 Range $26.59 - $39.15

Q1 2023

Shares 56,773 Value ($000) $1,883 Avg Close $33.07 Range $29.01 - $38.84

Q4 2022

Shares 57,560 Value ($000) $1,908 Avg Close $31.89 Range $23.32 - $39.10

Q3 2022

Shares 56,644 Value ($000) $1,459 Avg Close $30.61 Range $25.19 - $36.23

Q2 2022

Shares 57,979 Value ($000) $1,726 Avg Close $32.45 Range $27.74 - $43.13

Q1 2022

Shares 57,253 Value ($000) $2,427 Avg Close $47.86 Range $37.72 - $60.49

Q4 2021

Shares 61,919 Value ($000) $3,552 Avg Close $52.01 Range $40.97 - $60.84

Q3 2021

Shares 59,832 Value ($000) $2,549 Avg Close $47.15 Range $39.00 - $56.24

Q2 2021

Shares 59,937 Value ($000) $3,220 Avg Close $53.53 Range $44.18 - $65.33

Q1 2021

Shares 60,507 Value ($000) $3,512 Avg Close $46.05 Range $31.59 - $59.42

Q4 2020

Shares 60,708 Value ($000) $1,891 Avg Close $27.90 Range $21.08 - $37.02

Q3 2020

Shares 60,708 Value ($000) $1,303 Avg Close $24.28 Range $19.08 - $31.10

Q2 2020

Shares 59,733 Value ($000) $1,352 Avg Close $19.01 Range $12.37 - $24.86

Q1 2020

Shares 59,698 Value ($000) $824 Avg Close $21.23 Range $11.79 - $30.00

Q4 2019

Shares 60,372 Value ($000) $1,417 Avg Close $20.22 Range $13.94 - $24.24

Q3 2019

Shares 60,862 Value ($000) $891 Avg Close $13.88 Range $11.20 - $16.67

Q2 2019

Shares 60,135 Value ($000) $837 Avg Close $12.74 Range $10.50 - $14.82

Q1 2019

Shares 58,853 Value ($000) $609 Avg Close $10.73 Range $8.10 - $13.12

Q4 2018

Shares 60,148 Value ($000) $509 Avg Close $9.78 Range $6.94 - $13.00

Q3 2018

Shares 58,822 Value ($000) $738 Avg Close $14.54 Range $12.28 - $17.35

Q2 2018

Shares 58,826 Value ($000) $977 Avg Close $17.54 Range $15.36 - $19.59

Q1 2018

Shares 57,605 Value ($000) $1,109 Avg Close $21.09 Range $16.29 - $27.20

Q4 2017

Shares 51,905 Value ($000) $1,198 Avg Close $25.63 Range $18.86 - $34.59

Q3 2017

Shares 52,750 Value ($000) $1,615 Avg Close $23.64 Range $18.41 - $30.92

Q2 2017

Shares 58,305 Value ($000) $1,093 Avg Close $20.12 Range $14.93 - $26.21

Q1 2017

Shares 63,205 Value ($000) $1,066 Avg Close $13.27 Range $9.42 - $16.99

Q4 2016

Shares 66,105 Value ($000) $641 Avg Close $9.08 Range $7.06 - $10.65

Q3 2016

Shares 68,005 Value ($000) $504 Avg Close $6.56 Range $5.40 - $7.50

Q2 2016

Shares 67,305 Value ($000) $383 Avg Close $5.52 Range $4.95 - $6.07

Q1 2016

Shares 67,005 Value ($000) $359 Avg Close $5.07 Range $4.50 - $5.72

Q4 2015

Shares 58,548 Value ($000) $300 Avg Close $5.17 Range $4.60 - $5.91

Q3 2015

Shares 57,541 Value ($000) $330 Avg Close $6.60 Range $5.29 - $8.16

Q2 2015

Shares 57,741 Value ($000) $360 Avg Close $6.46 Range $5.26 - $7.51

Q1 2015

Shares 53,514 Value ($000) $383 Avg Close $8.80 Range $7.14 - $10.29

Q4 2014

Shares 54,614 Value ($000) $507 Avg Close $8.47 Range $7.32 - $9.51

Q3 2014

Shares 54,382 Value ($000) $487 Avg Close $9.32 Range $8.58 - $10.29

Q2 2014

Shares 53,773 Value ($000) $487 Avg Close $9.56 Range $7.62 - $13.89

Q1 2014

Shares 43,273 Value ($000) $569 Avg Close $12.49 Range $9.51 - $15.00

Q4 2013

Shares 43,273 Value ($000) $434 Avg Close $9.00 Range $6.53 - $10.66

Q3 2013

Shares 42,973 Value ($000) $297 Avg Close $6.67 Range $6.00 - $7.11

Q2 2013

Shares 41,614 Value ($000) $252 Avg Close $6.00 Range $4.52 - $6.45

Q1 2013

Shares 48,294 Value ($000) $314 Avg Close $5.83 Range $4.65 - $6.57

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	41,559	$1,053	$26.60	$21.49 - $31.11
Q3 2025	41,591	$1,133	$24.59	$21.28 - $29.72
Q2 2025	38,809	$876	$20.53	$16.66 - $23.22
Q1 2025	42,046	$900	$31.93	$20.86 - $40.10
Q4 2024	42,046	$1,512	$36.98	$32.08 - $41.84
Q3 2024	42,441	$1,695	$41.01	$32.33 - $56.47
Q2 2024	43,534	$2,133	$44.88	$38.16 - $50.51
Q1 2024	44,989	$2,067	$40.62	$31.01 - $49.25
Q4 2023	47,686	$1,628	$27.80	$22.15 - $35.54
Q3 2023	49,313	$1,463	$33.70	$28.04 - $40.80
Q2 2023	54,214	$2,085	$32.18	$26.59 - $39.15
Q1 2023	56,773	$1,883	$33.07	$29.01 - $38.84
Q4 2022	57,560	$1,908	$31.89	$23.32 - $39.10
Q3 2022	56,644	$1,459	$30.61	$25.19 - $36.23
Q2 2022	57,979	$1,726	$32.45	$27.74 - $43.13
Q1 2022	57,253	$2,427	$47.86	$37.72 - $60.49
Q4 2021	61,919	$3,552	$52.01	$40.97 - $60.84
Q3 2021	59,832	$2,549	$47.15	$39.00 - $56.24
Q2 2021	59,937	$3,220	$53.53	$44.18 - $65.33
Q1 2021	60,507	$3,512	$46.05	$31.59 - $59.42
Q4 2020	60,708	$1,891	$27.90	$21.08 - $37.02
Q3 2020	60,708	$1,303	$24.28	$19.08 - $31.10
Q2 2020	59,733	$1,352	$19.01	$12.37 - $24.86
Q1 2020	59,698	$824	$21.23	$11.79 - $30.00
Q4 2019	60,372	$1,417	$20.22	$13.94 - $24.24
Q3 2019	60,862	$891	$13.88	$11.20 - $16.67
Q2 2019	60,135	$837	$12.74	$10.50 - $14.82
Q1 2019	58,853	$609	$10.73	$8.10 - $13.12
Q4 2018	60,148	$509	$9.78	$6.94 - $13.00
Q3 2018	58,822	$738	$14.54	$12.28 - $17.35
Q2 2018	58,826	$977	$17.54	$15.36 - $19.59
Q1 2018	57,605	$1,109	$21.09	$16.29 - $27.20
Q4 2017	51,905	$1,198	$25.63	$18.86 - $34.59
Q3 2017	52,750	$1,615	$23.64	$18.41 - $30.92
Q2 2017	58,305	$1,093	$20.12	$14.93 - $26.21
Q1 2017	63,205	$1,066	$13.27	$9.42 - $16.99
Q4 2016	66,105	$641	$9.08	$7.06 - $10.65
Q3 2016	68,005	$504	$6.56	$5.40 - $7.50
Q2 2016	67,305	$383	$5.52	$4.95 - $6.07
Q1 2016	67,005	$359	$5.07	$4.50 - $5.72
Q4 2015	58,548	$300	$5.17	$4.60 - $5.91
Q3 2015	57,541	$330	$6.60	$5.29 - $8.16
Q2 2015	57,741	$360	$6.46	$5.26 - $7.51
Q1 2015	53,514	$383	$8.80	$7.14 - $10.29
Q4 2014	54,614	$507	$8.47	$7.32 - $9.51
Q3 2014	54,382	$487	$9.32	$8.58 - $10.29
Q2 2014	53,773	$487	$9.56	$7.62 - $13.89
Q1 2014	43,273	$569	$12.49	$9.51 - $15.00
Q4 2013	43,273	$434	$9.00	$6.53 - $10.66
Q3 2013	42,973	$297	$6.67	$6.00 - $7.11
Q2 2013	41,614	$252	$6.00	$4.52 - $6.45
Q1 2013	48,294	$314	$5.83	$4.65 - $6.57