ALLEGHENY TECHNOLOGIES INC

Ticker: ATI CUSIP: 01741R102 Class: EQTY

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

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

Q4 2025

Shares 130,422 Value ($000) $14,967 Avg Close $97.45 Range $79.29 - $117.48

Q3 2025

Shares 134,094 Value ($000) $10,907 Avg Close $81.04 Range $70.42 - $96.20

Q2 2025

Shares 132,134 Value ($000) $11,408 Avg Close $68.45 Range $39.23 - $87.75

Q1 2025

Shares 131,107 Value ($000) $6,821 Avg Close $56.77 Range $49.07 - $66.80

Q4 2024

Shares 116,390 Value ($000) $6,406 Avg Close $58.97 Range $52.45 - $67.09

Q3 2024

Shares 117,704 Value ($000) $7,876 Avg Close $62.09 Range $53.90 - $68.92

Q2 2024

Shares 121,427 Value ($000) $6,733 Avg Close $56.03 Range $47.90 - $62.44

Q1 2024

Shares 127,762 Value ($000) $6,538 Avg Close $45.22 Range $38.04 - $51.95

Q4 2023

Shares 136,132 Value ($000) $6,190 Avg Close $41.52 Range $35.03 - $46.57

Q3 2023

Shares 142,155 Value ($000) $5,850 Avg Close $44.44 Range $41.04 - $47.92

Q2 2023

Shares 156,043 Value ($000) $6,902 Avg Close $38.25 Range $34.10 - $44.39

Q1 2023

Shares 159,880 Value ($000) $6,309 Avg Close $37.76 Range $29.37 - $43.32

Q4 2022

Shares 162,581 Value ($000) $4,855 Avg Close $29.27 Range $25.39 - $31.74

Q3 2022

Shares 155,833 Value ($000) $4,147 Avg Close $27.84 Range $20.52 - $33.31

Q2 2022

Shares 161,826 Value ($000) $3,675 Avg Close $26.35 Range $20.87 - $30.74

Q1 2022

Shares 162,784 Value ($000) $4,369 Avg Close $23.18 Range $16.02 - $28.45

Q4 2021

Shares 176,883 Value ($000) $2,818 Avg Close $16.05 Range $13.85 - $18.33

Q3 2021

Shares 172,892 Value ($000) $2,875 Avg Close $18.91 Range $15.75 - $22.33

Q2 2021

Shares 175,452 Value ($000) $3,658 Avg Close $22.93 Range $20.15 - $25.04

Q1 2021

Shares 191,361 Value ($000) $4,030 Avg Close $19.55 Range $15.97 - $22.87

Q4 2020

Shares 192,423 Value ($000) $3,227 Avg Close $12.70 Range $8.24 - $17.60

Q3 2020

Shares 192,684 Value ($000) $1,680 Avg Close $9.20 Range $8.04 - $11.06

Q2 2020

Shares 192,684 Value ($000) $1,963 Avg Close $8.67 Range $6.21 - $12.60

Q1 2020

Shares 190,010 Value ($000) $1,615 Avg Close $15.97 Range $4.95 - $20.91

Q4 2019

Shares 192,154 Value ($000) $3,970 Avg Close $21.68 Range $18.98 - $24.17

Q3 2019

Shares 196,036 Value ($000) $3,970 Avg Close $21.15 Range $17.03 - $25.66

Q2 2019

Shares 193,694 Value ($000) $4,881 Avg Close $24.37 Range $21.15 - $27.49

Q1 2019

Shares 192,281 Value ($000) $4,917 Avg Close $26.33 Range $21.00 - $29.50

Q4 2018

Shares 196,557 Value ($000) $4,279 Avg Close $25.93 Range $20.84 - $29.84

Q3 2018

Shares 192,124 Value ($000) $5,677 Avg Close $26.89 Range $24.31 - $30.18

Q2 2018

Shares 192,192 Value ($000) $4,828 Avg Close $27.05 Range $22.93 - $29.87

Q1 2018

Shares 197,465 Value ($000) $4,676 Avg Close $26.83 Range $22.70 - $30.25

Q4 2017

Shares 204,852 Value ($000) $4,945 Avg Close $23.80 Range $21.01 - $26.59

Q3 2017

Shares 181,170 Value ($000) $4,330 Avg Close $19.78 Range $16.51 - $24.00

Q2 2017

Shares 192,644 Value ($000) $3,277 Avg Close $16.82 Range $14.54 - $20.11

Q1 2017

Shares 213,916 Value ($000) $3,842 Avg Close $18.80 Range $15.61 - $23.69

Q4 2016

Shares 223,916 Value ($000) $3,567 Avg Close $16.62 Range $13.15 - $19.20

Q3 2016

Shares 229,816 Value ($000) $4,153 Avg Close $16.54 Range $12.22 - $18.59

Q2 2016

Shares 227,716 Value ($000) $2,903 Avg Close $14.18 Range $10.81 - $17.83

Q1 2016

Shares 238,502 Value ($000) $3,888 Avg Close $12.00 Range $6.97 - $18.17

Q4 2015

Shares 208,823 Value ($000) $2,349 Avg Close $13.45 Range $9.91 - $18.65

Q3 2015

Shares 205,532 Value ($000) $2,914 Avg Close $20.12 Range $13.34 - $30.02

Q2 2015

Shares 199,467 Value ($000) $6,024 Avg Close $31.90 Range $27.97 - $36.35

Q1 2015

Shares 205,382 Value ($000) $6,164 Avg Close $29.80 Range $25.96 - $33.60

Q4 2014

Shares 208,719 Value ($000) $7,257 Avg Close $31.49 Range $28.73 - $35.21

Q3 2014

Shares 206,733 Value ($000) $7,670 Avg Close $39.92 Range $34.97 - $43.90

Q2 2014

Shares 198,199 Value ($000) $8,939 Avg Close $38.68 Range $35.44 - $42.89

Q1 2014

Shares 196,399 Value ($000) $7,400 Avg Close $31.60 Range $27.91 - $36.14

Q4 2013

Shares 195,499 Value ($000) $6,966 Avg Close $30.74 Range $27.52 - $33.68

Q3 2013

Shares 194,099 Value ($000) $5,924 Avg Close $26.04 Range $23.74 - $30.56

Q2 2013

Shares 188,120 Value ($000) $4,949 Avg Close $26.04 Range $23.70 - $29.42

Q1 2013

Shares 186,248 Value ($000) $5,906 Avg Close $28.93 Range $26.55 - $31.33

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	130,422	$14,967	$97.45	$79.29 - $117.48
Q3 2025	134,094	$10,907	$81.04	$70.42 - $96.20
Q2 2025	132,134	$11,408	$68.45	$39.23 - $87.75
Q1 2025	131,107	$6,821	$56.77	$49.07 - $66.80
Q4 2024	116,390	$6,406	$58.97	$52.45 - $67.09
Q3 2024	117,704	$7,876	$62.09	$53.90 - $68.92
Q2 2024	121,427	$6,733	$56.03	$47.90 - $62.44
Q1 2024	127,762	$6,538	$45.22	$38.04 - $51.95
Q4 2023	136,132	$6,190	$41.52	$35.03 - $46.57
Q3 2023	142,155	$5,850	$44.44	$41.04 - $47.92
Q2 2023	156,043	$6,902	$38.25	$34.10 - $44.39
Q1 2023	159,880	$6,309	$37.76	$29.37 - $43.32
Q4 2022	162,581	$4,855	$29.27	$25.39 - $31.74
Q3 2022	155,833	$4,147	$27.84	$20.52 - $33.31
Q2 2022	161,826	$3,675	$26.35	$20.87 - $30.74
Q1 2022	162,784	$4,369	$23.18	$16.02 - $28.45
Q4 2021	176,883	$2,818	$16.05	$13.85 - $18.33
Q3 2021	172,892	$2,875	$18.91	$15.75 - $22.33
Q2 2021	175,452	$3,658	$22.93	$20.15 - $25.04
Q1 2021	191,361	$4,030	$19.55	$15.97 - $22.87
Q4 2020	192,423	$3,227	$12.70	$8.24 - $17.60
Q3 2020	192,684	$1,680	$9.20	$8.04 - $11.06
Q2 2020	192,684	$1,963	$8.67	$6.21 - $12.60
Q1 2020	190,010	$1,615	$15.97	$4.95 - $20.91
Q4 2019	192,154	$3,970	$21.68	$18.98 - $24.17
Q3 2019	196,036	$3,970	$21.15	$17.03 - $25.66
Q2 2019	193,694	$4,881	$24.37	$21.15 - $27.49
Q1 2019	192,281	$4,917	$26.33	$21.00 - $29.50
Q4 2018	196,557	$4,279	$25.93	$20.84 - $29.84
Q3 2018	192,124	$5,677	$26.89	$24.31 - $30.18
Q2 2018	192,192	$4,828	$27.05	$22.93 - $29.87
Q1 2018	197,465	$4,676	$26.83	$22.70 - $30.25
Q4 2017	204,852	$4,945	$23.80	$21.01 - $26.59
Q3 2017	181,170	$4,330	$19.78	$16.51 - $24.00
Q2 2017	192,644	$3,277	$16.82	$14.54 - $20.11
Q1 2017	213,916	$3,842	$18.80	$15.61 - $23.69
Q4 2016	223,916	$3,567	$16.62	$13.15 - $19.20
Q3 2016	229,816	$4,153	$16.54	$12.22 - $18.59
Q2 2016	227,716	$2,903	$14.18	$10.81 - $17.83
Q1 2016	238,502	$3,888	$12.00	$6.97 - $18.17
Q4 2015	208,823	$2,349	$13.45	$9.91 - $18.65
Q3 2015	205,532	$2,914	$20.12	$13.34 - $30.02
Q2 2015	199,467	$6,024	$31.90	$27.97 - $36.35
Q1 2015	205,382	$6,164	$29.80	$25.96 - $33.60
Q4 2014	208,719	$7,257	$31.49	$28.73 - $35.21
Q3 2014	206,733	$7,670	$39.92	$34.97 - $43.90
Q2 2014	198,199	$8,939	$38.68	$35.44 - $42.89
Q1 2014	196,399	$7,400	$31.60	$27.91 - $36.14
Q4 2013	195,499	$6,966	$30.74	$27.52 - $33.68
Q3 2013	194,099	$5,924	$26.04	$23.74 - $30.56
Q2 2013	188,120	$4,949	$26.04	$23.70 - $29.42
Q1 2013	186,248	$5,906	$28.93	$26.55 - $31.33