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

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 11 new positions, 1 increased, 1 reduced, and 1 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in ATI

/100

Strong Institutional Accumulation

Added / Increased12

Reduced1

Exited1

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

Other

69% of tracked value

Institutions

tracked investors

Total Reported

$950.8M

combined 13F value

Other69.4%
Hedge Funds30.5%
Growth Funds0.0%

Other(4)

69.4%

Hedge Funds(2)

30.5%

Growth Funds(1)

0.0%

Tracked investors reporting ATI

Investor	Firm	Shares	Market value	% of portfolio	As of
Andreas Halvorsen	Viking Global Investors	3.3M	$484.8M	1.36%	Mar 31, 2026
Steve Cohen	Point72 Asset Management	1.9M	$282.8M	0.36%	Mar 31, 2026
Izzy Englander	Millennium Management	626.8K	$91.2M	0.04%	Mar 31, 2026
Ken Griffin	Citadel Advisors	557.4K	$81.1M	0.01%	Mar 31, 2026
Ray Dalio	Bridgewater Associates	22K	$3.2M	0.01%	Mar 31, 2026
George Soros	Soros Fund Management	52.8K	$7.7M	0.08%	Mar 31, 2026
Cathie Wood	ARK Investment Management	679	$98.8K	0.00%	Mar 31, 2026

Andreas HalvorsenMar 31, 2026
Viking Global Investors
Shares
3.3M
Value
$484.8M
% Portfolio
1.36%
Steve CohenMar 31, 2026
Point72 Asset Management
Shares
1.9M
Value
$282.8M
% Portfolio
0.36%
Izzy EnglanderMar 31, 2026
Millennium Management
Shares
626.8K
Value
$91.2M
% Portfolio
0.04%
Ken GriffinMar 31, 2026
Citadel Advisors
Shares
557.4K
Value
$81.1M
% Portfolio
0.01%
Ray DalioMar 31, 2026
Bridgewater Associates
Shares
22K
Value
$3.2M
% Portfolio
0.01%
George SorosMar 31, 2026
Soros Fund Management
Shares
52.8K
Value
$7.7M
% Portfolio
0.08%
Cathie WoodMar 31, 2026
ARK Investment Management
Shares
679
Value
$98.8K
% Portfolio
0.00%

Recent activity

Investor	Action	Δ %	Current value	Filing date
Izzy Englander	New	—	$59.9M	Feb 17, 2026
Izzy Englander	New	—	$91.2M	May 15, 2026
Steve Cohen	New	—	$91.8M	Feb 17, 2026
Ken Griffin	New	—	$81.1M	May 15, 2026
Andreas Halvorsen	New	—	$484.8M	May 15, 2026
Steve Cohen	New	—	$282.8M	May 15, 2026
George Soros	New	—	$7.7M	May 15, 2026
Ray Dalio	New	—	$3.2M	May 15, 2026
Cathie Wood	Reduced	-23.62%	$98.8K	May 12, 2026
Ray Dalio	Sold	-100.00%	$0	Feb 13, 2026
Cathie Wood	Increased	19.81%	$102	Feb 11, 2026
Ken Griffin	New	—	$43.5M	Nov 14, 2025
Ray Dalio	New	—	$11.1M	Nov 13, 2025
Cathie Wood	New	—	$60.4K	Nov 12, 2025

Izzy Englander
New
$59.9MFeb 17, 2026
Izzy Englander
New
$91.2MMay 15, 2026
Steve Cohen
New
$91.8MFeb 17, 2026
Ken Griffin
New
$81.1MMay 15, 2026
Andreas Halvorsen
New
$484.8MMay 15, 2026
Steve Cohen
New
$282.8MMay 15, 2026
George Soros
New
$7.7MMay 15, 2026
Ray Dalio
New
$3.2MMay 15, 2026
Cathie Wood
Reduced
$98.8K(-23.62%)May 12, 2026
Ray Dalio
Sold
$0(-100.00%)Feb 13, 2026
Cathie Wood
Increased
$102(19.81%)Feb 11, 2026
Ken Griffin
New
$43.5MNov 14, 2025
Ray Dalio
New
$11.1MNov 13, 2025
Cathie Wood
New
$60.4KNov 12, 2025

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 11 new positions, 1 increased, 1 reduced, and 1 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.