How many institutional investors hold ATI?

7 tracked institutional investors disclosed a position in ATI (ATI INC) in their most recent 13F filing.

Who is the largest institutional holder of ATI?

Andreas Halvorsen, Viking Global Investors, holds the largest disclosed position in ATI, valued at $485M.

Where does this ATI ownership data come from?

SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.

ATI — ATI INC

Name: ATI INC (ATI) — Institutional Ownership
Creator: InvestorLens
License: https://www.sec.gov/about/website-policies

Public company

For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

Why are billionaires buying ATI?

Built from public SEC filings and public economic data. Not a recommendation.

Confidence

Institutional Conviction

Mixed · 5 buying vs 3 selling last quarter

Macro Tailwind

Macro conditions are mixed for this sector

Why? — Evidence & Confidence ▾

Of 8 tracked investors who changed their ATI position last quarter, 5 bought and 3 sold (63% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 56/100 in a Overheat regime).

Supporting evidence

+5 tracked investors added or increased positions last quarter (Izzy Englander, George Soros, Ken Griffin, …)
+7 tracked investors reported holding ATI at their latest filing
+Macro Health is 56/100 in a Overheat regime — historically acceptable for this sectorsource

Contradicting evidence — always shown

−3 tracked investors reduced or exited last quarter (3 reduced, 0 sold out)
−13F data is disclosed up to 45 days after quarter end — positions may have changed since

Know the limits

· 13F disclosure lag (up to 45 days)
· Tracked investors are a sample, not the whole market
· Sector regime fit is a historical average, not a guarantee

Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 9/18/2026.

About ATI INC (ATI)

ATI INC (ATI) appears in the most recent 13F filings of 7 tracked institutional investors. The largest disclosed position is held by Andreas Halvorsen (Viking Global Investors), valued at $485M. Across recent filings, tracked investors recorded 12 new positions, 21 increased, 19 reduced, and 5 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in ATI

/100

Mixed Activity

Added / Increased33

Reduced19

Exited5

BearishBullish

Crowded Trade Score™

How many top investors track ATI

/100

Moderate Interest

7investors

Several tracked investors have exposure.

UndiscoveredCrowded

151015+

ATI Ownership Composition

How ATI INC is held across tracked investor types, based on reported 13F positions.

Dominant Type

Multi-Strategy / Quant

65% of tracked value

Institutions

tracked investors

Total Reported

$851.9M

combined 13F value

Multi-Strategy / Quant64.6%
Other26.7%
Macro8.7%

Multi-Strategy / Quant(3)

64.6%

Other(1)

26.7%

Macro(3)

8.7%

Tracked investors currently reporting ATI

Investor	Firm	Shares	Market value	% of portfolio	As of
Andreas Halvorsen	Viking Global Investors	1.2M	$227.4M	0.65%	Jun 30, 2026
Steve Cohen	Point72 Asset Management	1.2M	$246.2M	0.27%	Jun 30, 2026
Izzy Englander	Millennium Management	883.3K	$174.1M	0.06%	Jun 30, 2026
Ken Griffin	Citadel Advisors	659.6K	$130M	0.01%	Jun 30, 2026
Paul Tudor Jones	Tudor Investment Corp	188.3K	$37.1M	0.05%	Jun 30, 2026
George Soros	Soros Fund Management	73.3K	$14.5M	0.18%	Jun 30, 2026
Ray Dalio	Bridgewater Associates	114.9K	$22.7M	0.09%	Jun 30, 2026

Andreas HalvorsenJun 30, 2026
Viking Global Investors
Shares
1.2M
Value
$227.4M
% Portfolio
0.65%
Steve CohenJun 30, 2026
Point72 Asset Management
Shares
1.2M
Value
$246.2M
% Portfolio
0.27%
Izzy EnglanderJun 30, 2026
Millennium Management
Shares
883.3K
Value
$174.1M
% Portfolio
0.06%
Ken GriffinJun 30, 2026
Citadel Advisors
Shares
659.6K
Value
$130M
% Portfolio
0.01%
Paul Tudor JonesJun 30, 2026
Tudor Investment Corp
Shares
188.3K
Value
$37.1M
% Portfolio
0.05%
George SorosJun 30, 2026
Soros Fund Management
Shares
73.3K
Value
$14.5M
% Portfolio
0.18%
Ray DalioJun 30, 2026
Bridgewater Associates
Shares
114.9K
Value
$22.7M
% Portfolio
0.09%

Recent activity

Investor	Action	Δ %	Current value	Filing date
Andreas Halvorsen	New	—	$484.8M	May 15, 2026
Andreas Halvorsen	Reduced	-65.38%	$227.4M	Aug 14, 2026
Izzy Englander	Reduced	-17.99%	$106.7M	Nov 14, 2024
Izzy Englander	Reduced	-93.73%	$5.5M	Feb 14, 2025
Izzy Englander	Increased	1271.53%	$71.3M	May 15, 2025
Izzy Englander	Reduced	-78.93%	$24.9M	Aug 14, 2025
Izzy Englander	Increased	54.74%	$59.9M	Feb 17, 2026
Izzy Englander	Increased	20.00%	$91.2M	May 15, 2026
Izzy Englander	Increased	40.91%	$174.1M	Aug 14, 2026
George Soros	Increased	98.27%	$21.5M	Feb 14, 2025
George Soros	Increased	56.80%	$31.9M	May 15, 2025
George Soros	Reduced	-40.92%	$31.3M	Aug 14, 2025
George Soros	Sold	-100.00%	$0	Nov 14, 2025
George Soros	New	—	$7.7M	May 15, 2026
George Soros	Increased	38.82%	$14.5M	Aug 14, 2026
Cathie Wood	Reduced	-7.59%	$176.5K	Jan 17, 2024
Cathie Wood	Reduced	-15.22%	$168.4K	Apr 18, 2024
Cathie Wood	Reduced	-28.08%	$131.3K	Jul 26, 2024
Cathie Wood	Reduced	-29.36%	$111.9K	Oct 31, 2024
Cathie Wood	Reduced	-14.77%	$78.4K	Feb 4, 2025
Cathie Wood	Increased	8.42%	$80.4K	May 7, 2025
Cathie Wood	Reduced	-89.97%	$13.4K	Jul 30, 2025
Cathie Wood	Increased	19.81%	$102	Feb 11, 2026
Cathie Wood	Reduced	-23.62%	$98.8K	May 12, 2026
Cathie Wood	Reduced	-28.28%	$96K	Aug 14, 2026
Ken Griffin	Reduced	-58.28%	$29.3M	Nov 14, 2024
Ken Griffin	Increased	184.30%	$67.7M	May 15, 2025
Ken Griffin	Reduced	-19.02%	$91M	Aug 14, 2025
Ken Griffin	Sold	-100.00%	$0	Nov 14, 2025
Ken Griffin	Increased	18.34%	$130M	Aug 14, 2026
Ray Dalio	New	—	$4.2M	Feb 13, 2025
Ray Dalio	Increased	314.49%	$16.5M	May 14, 2025
Ray Dalio	Sold	-100.00%	$0	Aug 13, 2025
Ray Dalio	New	—	$11.1M	Nov 13, 2025
Ray Dalio	Sold	-100.00%	$0	Feb 13, 2026
Ray Dalio	New	—	$3.2M	May 15, 2026
Ray Dalio	Increased	423.64%	$22.7M	Aug 14, 2026
Steve Cohen	Increased	9.96%	$38.3M	Nov 14, 2024
Steve Cohen	Increased	39.56%	$43.9M	Feb 14, 2025
Steve Cohen	Increased	28.93%	$53.5M	Jul 21, 2025
Steve Cohen	Reduced	-23.56%	$67.9M	Aug 14, 2025
Steve Cohen	Reduced	-60.68%	$25.1M	Nov 14, 2025
Steve Cohen	Increased	158.83%	$91.8M	Feb 17, 2026
Steve Cohen	Increased	142.93%	$282.8M	May 15, 2026
Steve Cohen	Reduced	-35.76%	$246.2M	Aug 14, 2026
Paul Tudor Jones	New	—	$13.8M	Nov 14, 2024
Paul Tudor Jones	Sold	-100.00%	$0	Feb 14, 2025
Paul Tudor Jones	New	—	$11.9M	May 15, 2025
Paul Tudor Jones	Increased	164.40%	$52.1M	Aug 14, 2025
Paul Tudor Jones	Reduced	-67.00%	$16.2M	Dec 9, 2025
Paul Tudor Jones	Increased	1519.94%	$19.3M	May 15, 2026
Paul Tudor Jones	Increased	41.78%	$37.1M	Aug 14, 2026
Cathie Wood	New	—	$172.9K	Oct 18, 2023
Steve Cohen	New	—	$28.8M	Sep 16, 2024
Ken Griffin	New	—	$58.3M	Aug 14, 2024
Izzy Englander	New	—	$38.6M	May 15, 2024
George Soros	New	—	$13.2M	Nov 14, 2024

Andreas Halvorsen
New
$484.8MMay 15, 2026
Andreas Halvorsen
Reduced
$227.4M(-65.38%)Aug 14, 2026
Izzy Englander
Reduced
$106.7M(-17.99%)Nov 14, 2024
Izzy Englander
Reduced
$5.5M(-93.73%)Feb 14, 2025
Izzy Englander
Increased
$71.3M(1271.53%)May 15, 2025
Izzy Englander
Reduced
$24.9M(-78.93%)Aug 14, 2025
Izzy Englander
Increased
$59.9M(54.74%)Feb 17, 2026
Izzy Englander
Increased
$91.2M(20.00%)May 15, 2026
Izzy Englander
Increased
$174.1M(40.91%)Aug 14, 2026
George Soros
Increased
$21.5M(98.27%)Feb 14, 2025
George Soros
Increased
$31.9M(56.80%)May 15, 2025
George Soros
Reduced
$31.3M(-40.92%)Aug 14, 2025
George Soros
Sold
$0(-100.00%)Nov 14, 2025
George Soros
New
$7.7MMay 15, 2026
George Soros
Increased
$14.5M(38.82%)Aug 14, 2026
Cathie Wood
Reduced
$176.5K(-7.59%)Jan 17, 2024
Cathie Wood
Reduced
$168.4K(-15.22%)Apr 18, 2024
Cathie Wood
Reduced
$131.3K(-28.08%)Jul 26, 2024
Cathie Wood
Reduced
$111.9K(-29.36%)Oct 31, 2024
Cathie Wood
Reduced
$78.4K(-14.77%)Feb 4, 2025
Cathie Wood
Increased
$80.4K(8.42%)May 7, 2025
Cathie Wood
Reduced
$13.4K(-89.97%)Jul 30, 2025
Cathie Wood
Increased
$102(19.81%)Feb 11, 2026
Cathie Wood
Reduced
$98.8K(-23.62%)May 12, 2026
Cathie Wood
Reduced
$96K(-28.28%)Aug 14, 2026
Ken Griffin
Reduced
$29.3M(-58.28%)Nov 14, 2024
Ken Griffin
Increased
$67.7M(184.30%)May 15, 2025
Ken Griffin
Reduced
$91M(-19.02%)Aug 14, 2025
Ken Griffin
Sold
$0(-100.00%)Nov 14, 2025
Ken Griffin
Increased
$130M(18.34%)Aug 14, 2026
Ray Dalio
New
$4.2MFeb 13, 2025
Ray Dalio
Increased
$16.5M(314.49%)May 14, 2025
Ray Dalio
Sold
$0(-100.00%)Aug 13, 2025
Ray Dalio
New
$11.1MNov 13, 2025
Ray Dalio
Sold
$0(-100.00%)Feb 13, 2026
Ray Dalio
New
$3.2MMay 15, 2026
Ray Dalio
Increased
$22.7M(423.64%)Aug 14, 2026
Steve Cohen
Increased
$38.3M(9.96%)Nov 14, 2024
Steve Cohen
Increased
$43.9M(39.56%)Feb 14, 2025
Steve Cohen
Increased
$53.5M(28.93%)Jul 21, 2025
Steve Cohen
Reduced
$67.9M(-23.56%)Aug 14, 2025
Steve Cohen
Reduced
$25.1M(-60.68%)Nov 14, 2025
Steve Cohen
Increased
$91.8M(158.83%)Feb 17, 2026
Steve Cohen
Increased
$282.8M(142.93%)May 15, 2026
Steve Cohen
Reduced
$246.2M(-35.76%)Aug 14, 2026
Paul Tudor Jones
New
$13.8MNov 14, 2024
Paul Tudor Jones
Sold
$0(-100.00%)Feb 14, 2025
Paul Tudor Jones
New
$11.9MMay 15, 2025
Paul Tudor Jones
Increased
$52.1M(164.40%)Aug 14, 2025
Paul Tudor Jones
Reduced
$16.2M(-67.00%)Dec 9, 2025
Paul Tudor Jones
Increased
$19.3M(1519.94%)May 15, 2026
Paul Tudor Jones
Increased
$37.1M(41.78%)Aug 14, 2026
Cathie Wood
New
$172.9KOct 18, 2023
Steve Cohen
New
$28.8MSep 16, 2024
Ken Griffin
New
$58.3MAug 14, 2024
Izzy Englander
New
$38.6MMay 15, 2024
George Soros
New
$13.2MNov 14, 2024

Frequently asked questions

How many institutional investors hold ATI?: 7 tracked institutional investors disclosed a position in ATI (ATI INC) in their most recent 13F filing.
Who is the largest institutional holder of ATI?: Andreas Halvorsen, Viking Global Investors, holds the largest disclosed position in ATI, valued at $485M.
Did institutional ownership of ATI increase or decrease?: Across recent 13F filings, tracked investors recorded 12 new positions, 21 increased, 19 reduced, and 5 fully exited ATI.
Where does this ATI ownership data come from?: SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.