ATI Inc: which funds bought and sold

Institutions that bought and sold ATI shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 468 institutions that filed 13F reports for both quarters added to or opened positions in ATI, and 272 cut or closed them. Together they sold a net 851K shares, −0.7% on what they held at the start of the quarter. Active managers and hedge funds on our list were net sellers of 5.2M shares (−10.4%); index fund managers were net buyers of 2.5M shares (+6.1%). 164 opened a new position and 52 sold out entirely.

Bought, Q2 2026 468 institutions, 164 of them new holders Sold, Q2 2026 272 institutions, 52 of them sold out

Net change, all compared −851K shares (−0.7%)

Net change, active managers −5.2M shares (−10.4%), 48 bought, 47 sold

Buyers versus sellers

institutions compared, 827

468 bought 87 272 sold

Active managers and hedge funds 48 bought · 47 sold · −5.2M

Index fund managers 7 bought · 5 sold · +2.5M

Other institutions 413 bought · 220 sold · +1.9M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Blackrock, Inc. Index funds	+2.3M +13.8%	18.7M	$3.7B
Qube Research & Technologies Ltd Hedge fund	+1.3M +149.6%	2.1M	$423M
Bessemer Group Inc	+953K +45245.8%	955K	$188M
Polen Capital Management LLC Active manager	+819K New position	819K	$161M
Assenagon Asset Management S.A.	+730K +125.0%	1.3M	$259M
Price T Rowe Associates Inc Active manager	+693K +210.8%	1.0M	$201M
Two Sigma Investments, LP Hedge fund	+619K +3481.8%	637K	$125M
Dsm Capital Partners LLC Active manager	+441K New position	441K	$86.9M
Bank Of America Corp	+402K +29.5%	1.8M	$348M
Vanguard Portfolio Management LLC Index funds	+398K +6.8%	6.2M	$1.2B
1832 Asset Management L.P.	+308K +203.3%	459K	$90.6M
Goldman Sachs Group Inc	+303K +67.8%	751K	$148M
Thrivent Financial For Lutherans	+288K +571.9%	339K	$66.7M
Clearbridge Investments, LLC Active manager	+280K New position	280K	$55.3M
BNP Paribas Financial Markets	+271K +41.6%	923K	$182M
Millennium Management LLC Hedge fund	+256K +41.3%	875K	$173M
AQR Capital Management LLC Hedge fund	+210K +17.2%	1.4M	$282M
Morgan Stanley	+197K +11.8%	1.9M	$368M
Citadel Advisors LLC Hedge fund	+194K +64.0%	497K	$98M
Yaupon Capital Management LP Hedge fund	+180K New position	180K	$35.5M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Qube Research & Technologies Ltd Hedge fund	+1.3M +149.6%	2.1M	$423M
Polen Capital Management LLC Active manager	+819K New position	819K	$161M
Price T Rowe Associates Inc Active manager	+693K +210.8%	1.0M	$201M
Two Sigma Investments, LP Hedge fund	+619K +3481.8%	637K	$125M
Dsm Capital Partners LLC Active manager	+441K New position	441K	$86.9M
Clearbridge Investments, LLC Active manager	+280K New position	280K	$55.3M
Millennium Management LLC Hedge fund	+256K +41.3%	875K	$173M
AQR Capital Management LLC Hedge fund	+210K +17.2%	1.4M	$282M
Citadel Advisors LLC Hedge fund	+194K +64.0%	497K	$98M
Yaupon Capital Management LP Hedge fund	+180K New position	180K	$35.5M

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Viking Global Investors LP Hedge fund	−2.2M −65.4%	1.2M	$227M
Capital International Investors Active manager	−2.2M −36.8%	3.7M	$733M
Capital Research Global Investors Active manager	−1.1M −17.3%	5.1M	$1B
UBS Group AG	−954K −67.3%	465K	$91.6M
D. E. Shaw & Co., Inc. Hedge fund	−927K −53.2%	816K	$161M
PNC Financial Services Group, Inc.	−797K −95.8%	35K	$6.9M
Point72 Asset Management, L.P. Hedge fund	−692K −35.8%	1.2M	$244M
Prudential Financial Inc	−629K −77.6%	181K	$35.7M
Holocene Advisors, LP Hedge fund	−600K −54.7%	498K	$98.1M
SG Americas Securities, LLC	−586K −54.5%	490K	$96.5M
Capital World Investors Active manager	−464K −8.1%	5.2M	$1B
Invesco Ltd.	−406K −10.5%	3.4M	$680M
Arrowstreet Capital, Limited Partnership Hedge fund	−364K −30.2%	840K	$166M
Balyasny Asset Management L.P. Hedge fund	−338K −39.6%	514K	$101M
American Century Companies Inc Active manager	−303K −28.4%	766K	$151M
Frontier Capital Management Co LLC Active manager	−274K −39.5%	420K	$82.8M
Dendur Capital LP Hedge fund	−274K −21.4%	1.0M	$199M
FMR LLC Active manager	−258K −4.9%	5.0M	$983M
Jain Global LLC Hedge fund	−233K −88.0%	32K	$6.3M
Dimensional Fund Advisors LP	−207K −15.1%	1.2M	$229M

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Viking Global Investors LP Hedge fund	−2.2M −65.4%	1.2M	$227M
Capital International Investors Active manager	−2.2M −36.8%	3.7M	$733M
Capital Research Global Investors Active manager	−1.1M −17.3%	5.1M	$1B
D. E. Shaw & Co., Inc. Hedge fund	−927K −53.2%	816K	$161M
Point72 Asset Management, L.P. Hedge fund	−692K −35.8%	1.2M	$244M
Holocene Advisors, LP Hedge fund	−600K −54.7%	498K	$98.1M
Capital World Investors Active manager	−464K −8.1%	5.2M	$1B
Arrowstreet Capital, Limited Partnership Hedge fund	−364K −30.2%	840K	$166M
Balyasny Asset Management L.P. Hedge fund	−338K −39.6%	514K	$101M
American Century Companies Inc Active manager	−303K −28.4%	766K	$151M

New positions

largest by value

Institution	Shares	Value June 30, 2026
Polen Capital Management LLCActive manager	819K	$161M
Dsm Capital Partners LLCActive manager	441K	$86.9M
Clearbridge Investments, LLCActive manager	280K	$55.3M
Yaupon Capital Management LPHedge fund	180K	$35.5M
Oribel Capital Management, LP	97K	$19M
Nearwater Capital Markets, Ltd	80K	$15.8M
Premier Fund Managers Ltd	72K	$14.2M
AGF Management Ltd	71K	$13.9M
Trexquant Investment LPHedge fund	70K	$13.8M
SG Capital Management LLC	58K	$11.5M

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Nomura Asset Management International Inc.	117K	$17M
Emerald Mutual Fund Advisers Trust	94K	$13.7M
Woodline Partners LPHedge fund	89K	$13M
Anomaly Capital Management, LPHedge fund	75K	$10.9M
Qsemble Capital Management, LP	42K	$6.1M
Freemont Management S.A.	27K	$4M
Sciencast Management LP	17K	$2.5M
Donoghue Forlines LLC	16K	$2.4M
Aigen Investment Management, LP	14K	$2M
Jefferies Financial Group Inc.	12K	$1.7M

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 790
Ten largest holders: 48.0%
Index fund managers: 33.7%
Active managers and hedge funds: 35.2%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	48	47	12	4	−5.2M	−10.4%
Index fund managers	7	5	0	0	+2.5M	+6.1%
Other institutions	413	220	152	48	+1.9M	+5.3%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on ATI.

Only managers that filed a holdings report for both quarters are compared (827 here). 26 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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