| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Capital International Investors | 13% | +8.3% | $1,434,712,580 | +$68,175,121 | 17,638,463 | +5% | Capital International Investors | 30 Sep 2025 |
| VANGUARD GROUP INC | 9.8% | $747,172,811 | 13,895,719 | The Vanguard Group | 31 Mar 2025 | |||
| BlackRock, Inc. | 10% | +2% | $1,078,405,219 | -$1,700,640 | 13,891,604 | -0.16% | BlackRock, Inc. | 30 Sep 2025 |
| Capital World Investors | 5.7% | $643,326,926 | 7,909,109 | Capital World Investors | 30 Sep 2025 | |||
| FMR LLC | 3.5% | -32% | $265,692,178 | -$128,504,170 | 4,941,272 | -33% | FMR LLC | 31 Mar 2025 |
As of 31 Dec 2025, 561 institutional investors reported holding 128,094,632 shares of ATI INC - Common Stock (ATI). This represents 92% of the company’s total 138,756,298 outstanding shares.
The largest institutional shareholders of ATI INC - Common Stock (ATI) together control 68% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Capital International Investors | 12% | 17,095,803 | -0.3% | 0.31% | $1,962,203,591 |
| BlackRock, Inc. | 11% | 14,666,770 | -1.3% | 0.03% | $1,683,158,523 |
| VANGUARD GROUP INC | 9.2% | 12,726,524 | -2.5% | 0.02% | $1,460,495,894 |
| Capital World Investors | 5.3% | 7,355,793 | -6.9% | 0.11% | $844,150,805 |
| STATE STREET CORP | 4% | 5,599,233 | -7.3% | 0.02% | $642,567,979 |
| FMR LLC | 3.7% | 5,074,824 | +3.6% | 0.03% | $582,386,731 |
| Capital Research Global Investors | 2.6% | 3,611,724 | +12% | 0.08% | $414,481,446 |
| Invesco Ltd. | 2.4% | 3,384,924 | +7.4% | 0.06% | $388,453,915 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.7% | 2,419,168 | -1% | 0.02% | $277,682,512 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 2,125,976 | -0.75% | 0.05% | $243,988,688 |
| DENDUR CAPITAL LP | 1.5% | 2,039,291 | -24% | 24% | $234,029,035 |
| D. E. Shaw & Co., Inc. | 1.5% | 2,022,621 | -33% | 0.18% | $232,115,986 |
| NORGES BANK | 1.2% | 1,732,195 | 0.02% | $198,786,698 | |
| AMERICAN CENTURY COMPANIES INC | 1.1% | 1,590,017 | +16% | 0.09% | $182,470,664 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.1% | 1,487,892 | -1.5% | 0.03% | $170,750,486 |
| MORGAN STANLEY | 0.93% | 1,283,539 | -9.3% | 0.01% | $147,299,204 |
| AMERIPRISE FINANCIAL INC | 0.9% | 1,244,248 | -5.4% | 0.03% | $142,789,900 |
| FRONTIER CAPITAL MANAGEMENT CO LLC | 0.88% | 1,227,453 | -21% | 1.5% | $140,862,463 |
| UBS Group AG | 0.86% | 1,193,129 | +143% | 0.03% | $136,923,485 |
| BOWEN HANES & CO INC | 0.85% | 1,177,705 | -11% | 3.4% | $135,153,000 |
| NORTHERN TRUST CORP | 0.85% | 1,174,117 | -4.3% | 0.02% | $134,741,667 |
| Holocene Advisors, LP | 0.77% | 1,071,745 | -30% | 0.26% | $122,993,456 |
| AQR CAPITAL MANAGEMENT LLC | 0.73% | 1,019,840 | +685% | 0.06% | $117,036,862 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.73% | 1,007,959 | +2.2% | 0.17% | $115,675,207 |
| LOOMIS SAYLES & CO L P | 0.67% | 935,673 | -7.3% | 0.13% | $107,377,834 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 128,094,632 | $14,704,962,068 | +$8,228,940 | $114.76 | 561 |
| 2025 Q3 | 128,763,846 | $10,473,304,699 | -$444,517,281 | $81.34 | 468 |
| 2025 Q2 | 134,063,276 | $11,564,420,309 | +$170,389,439 | $86.34 | 467 |
| 2025 Q1 | 132,651,028 | $6,896,324,529 | -$214,670,103 | $52.03 | 423 |
| 2024 Q4 | 136,430,673 | $7,509,391,637 | +$126,872,028 | $55.04 | 401 |
| 2024 Q3 | 132,940,202 | $8,887,213,273 | +$42,945,099 | $66.91 | 421 |
| 2024 Q2 | 132,292,912 | $7,335,869,816 | -$130,486,390 | $55.45 | 403 |
| 2024 Q1 | 133,908,614 | $6,851,994,578 | +$36,303,923 | $51.17 | 343 |
| 2023 Q4 | 134,229,495 | $6,103,395,291 | +$63,005,369 | $45.47 | 345 |
| 2023 Q3 | 133,170,498 | $5,480,251,328 | -$58,136,118 | $41.15 | 336 |
| 2023 Q2 | 134,529,963 | $5,949,753,318 | +$40,671,129 | $44.23 | 326 |
| 2023 Q1 | 133,923,983 | $5,284,501,188 | +$74,895,368 | $39.46 | 335 |
| 2022 Q4 | 132,384,495 | $3,953,815,393 | -$21,139,353 | $29.86 | 300 |
| 2022 Q3 | 131,275,526 | $3,493,922,927 | -$50,969,425 | $26.61 | 279 |
| 2022 Q2 | 132,796,735 | $3,016,791,707 | +$52,724,567 | $22.71 | 256 |
| 2022 Q1 | 130,648,661 | $3,507,680,455 | -$6,169,936 | $26.84 | 278 |
| 2021 Q4 | 131,629,933 | $2,096,171,701 | -$22,117,892 | $15.93 | 229 |
| 2021 Q3 | 132,777,336 | $2,208,300,713 | -$3,372,398 | $16.63 | 228 |
| 2021 Q2 | 132,617,558 | $2,764,614,928 | +$75,551,811 | $20.85 | 230 |
| 2021 Q1 | 128,980,577 | $2,716,895,617 | +$104,060,105 | $21.06 | 226 |
| 2020 Q4 | 124,604,673 | $2,090,113,386 | +$59,717,281 | $16.77 | 228 |
| 2020 Q3 | 121,677,134 | $1,061,369,289 | +$35,687,995 | $8.72 | 212 |
| 2020 Q2 | 117,181,834 | $1,194,191,725 | -$37,822,142 | $10.19 | 237 |
| 2020 Q1 | 121,654,685 | $1,033,993,354 | -$202,700,020 | $8.50 | 244 |
| 2019 Q4 | 133,170,423 | $2,749,957,752 | +$44,328,701 | $20.66 | 277 |
| 2019 Q3 | 130,665,473 | $2,646,018,374 | -$106,952,557 | $20.25 | 268 |
| 2019 Q2 | 135,647,278 | $3,418,278,900 | +$64,383,016 | $25.20 | 280 |
| 2019 Q1 | 135,829,501 | $3,474,485,743 | +$67,180,707 | $25.57 | 304 |
| 2018 Q4 | 136,300,064 | $2,967,619,455 | +$20,985,977 | $21.77 | 273 |
| 2018 Q3 | 133,735,655 | $3,951,681,146 | +$12,030,612 | $29.55 | 290 |
| 2018 Q2 | 134,126,344 | $3,369,497,583 | +$131,408,573 | $25.12 | 286 |
| 2018 Q1 | 129,128,601 | $3,058,074,075 | -$37,686,282 | $23.68 | 292 |
| 2017 Q4 | 130,660,546 | $3,154,889,611 | +$256,403,218 | $24.14 | 290 |
| 2017 Q3 | 119,554,565 | $2,857,256,654 | -$17,082,282 | $23.90 | 257 |
| 2017 Q2 | 121,030,977 | $2,058,773,100 | +$85,013,559 | $17.01 | 236 |
| 2017 Q1 | 115,619,958 | $2,076,624,512 | +$386,388,025 | $17.96 | 230 |
| 2016 Q4 | 105,250,422 | $1,676,962,990 | +$79,236,594 | $15.93 | 228 |
| 2016 Q3 | 100,856,952 | $1,821,747,819 | -$39,948,452 | $18.07 | 224 |
| 2016 Q2 | 104,669,590 | $1,334,438,499 | +$187,989,339 | $12.75 | 213 |
| 2016 Q1 | 89,458,964 | $1,457,409,698 | -$6,882,038 | $16.30 | 218 |
| 2015 Q4 | 90,912,500 | $1,022,664,904 | +$20,867,969 | $11.25 | 233 |
| 2015 Q3 | 89,338,346 | $1,266,962,393 | -$111,003,318 | $14.18 | 234 |
| 2015 Q2 | 87,812,512 | $2,651,974,079 | +$39,579,386 | $30.20 | 291 |
| 2015 Q1 | 83,983,170 | $2,521,077,539 | -$77,866,101 | $30.01 | 278 |
| 2014 Q4 | 86,077,143 | $2,991,991,177 | -$15,770,628 | $34.77 | 288 |
| 2014 Q3 | 86,050,710 | $3,192,554,670 | -$45,122,876 | $37.10 | 313 |
| 2014 Q2 | 86,773,130 | $3,916,956,457 | +$130,830,189 | $45.10 | 307 |
| 2014 Q1 | 84,441,310 | $3,182,178,410 | +$65,363,694 | $37.68 | 290 |