ATI

ATI • NYSE

ATI is a manufacturing - metal fabrication company in the industrials sector on NYSE, led by Kimberly A. Fields, with a market cap of $14.8B. As of Q3 2025, 93% of shares are held by 462 institutional investors, with Capital International Investors as the largest holder at 12.44%.

President and Chief Executive OfficerKimberly A. Fields

Market Cap$14.8B

Manufacturing - Metal Fabrication

Industrials

Employees7.3K

Websiteatimaterials.com

Country

United States of America

Overview

Overview of institutional ownership in ATI as of Q3 2025 with a market cap of $11.2B

All Institutions

Institutions: 462
Value Held: $10.5B
Shares Held: 128.7M
Avg Position: $22.7M
Median Position: $1.1M

Hedge Funds

Hedge Funds: 55
Value Held: $855.8M
Shares Held: 10.5M
Avg Position: $15.6M
Median Position: $4.7M

Ownership Breakdown

Institutional (non-HF)

85.7%

$9.6B

Hedge Funds

7.63%

$855.8M

Retail & Other

6.66%

$747.0M

Based on market cap of $11.2B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in ATI as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
C Capital International Investors Institution	-	$1.4B 0.23% of portfolio	12.44% 17.1M shares	Q1 2019 Held for 6y 8m	$615.90B
B BlackRock, Inc. Institution	-	$1.2B 0.02% of portfolio	10.78% 14.9M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$1.1B 0.02% of portfolio	9.47% 13.1M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
C Capital World Investors Institution	-	$642.6M 0.09% of portfolio	5.73% 7.9M shares	Q2 2018 Held for 7y 5m	$730.00B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$491.5M 0.02% of portfolio	4.38% 6.0M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
FMR LLC Institution	-	$398.5M 0.02% of portfolio	3.55% 4.9M shares	Q4 2017 Held for 7y 11m	$1.92T
Capital Research Global Investors RIA/Wealth	Maria Alejandra Herrera CIO	$262.3M 0.05% of portfolio	2.34% 3.2M shares	Q1 2025 Held for 8 months	$532.36B
Invesco Ltd. ETF Provider	Brian Christopher Hartigan CEO	$256.4M 0.04% of portfolio	2.29% 3.2M shares	≤ Q2 2013 Held for 12y 5m+	$633.08B
D D. E. Shaw & Co., Inc. Institution	-	$246.2M 0.21% of portfolio	2.20% 3.0M shares	≤ Q2 2013 Held for 12y 5m+	$115.81B
D DENDUR CAPITAL LP Hedge Fund•Event Driven	Malcolm Andrew Levine CIO	$218.7M 24.39% of portfolio	1.95% 2.7M shares	Q3 2024 Held for 1y 2m	$897.0M

Net Capital Flow

Institutional buying and selling activity for ATI in Q3 2025

Traded: −$320.7M
Buyers: 237
Sellers: 234
Total Bought: +$914.0M
Total Sold: −$1.2B
Avg Position: $19.3M

Biggest Buyers

Institution	Net Bought	Current Position
FMR LLC Institution	+$120.8M +1.5M shares	$398.5M 4.9M shares
C Capital World Investors Institution	+$87.9M +1.1M shares	$642.6M 7.9M shares
Holocene Advisors, LP Hedge Fund•Long/Short	+$75.6M +929.3K shares	$124.8M 1.5M shares
R Rokos Capital Management LLP Hedge Fund•Global Macro	+$42.9M +527.3K shares	$42.9M 527.3K shares
C Capital International Investors Institution	+$35.5M +436.1K shares	$1.4B 17.1M shares
STATE STREET CORP Institution	+$33.8M +415.5K shares	$491.5M 6.0M shares
Davidson Kempner Capital Management LP Hedge Fund•Multi-Strategy	+$32.5M +400.0K shares	$43.1M 530.0K shares
R ROYAL BANK OF CANADA Institution	+$28.4M +349.7K shares	$104.5M 1.3M shares
F Fisher Asset Management, LLC Institution	+$26.8M +329.7K shares	$77.9M 957.6K shares
LATEEF INVESTMENT MANAGEMENT, L.P. Long Only Manager	+$23.5M +289.4K shares	$23.5M 289.4K shares

Biggest Sellers

Institution	Net Sold	Current Position
P Palestra Capital Management LLC Hedge Fund•Long/Short	−$91.7M −1.1M shares	Sold Off 0 shares
FULLER & THALER ASSET MANAGEMENT, INC. Long Only Manager	−$78.7M −911.1K shares	Sold Off 0 shares
AMERIPRISE FINANCIAL INC Institution	−$64.7M −795.0K shares	$107.0M 1.3M shares
Castle Hook Partners LP Hedge Fund•Global Macro	−$64.3M −744.6K shares	Sold Off 0 shares
FRONTIER CAPITAL MANAGEMENT CO LLC Long Only Manager	−$54.6M −671.2K shares	$126.4M 1.6M shares
NorthRock Partners, LLC RIA/Wealth	−$46.7M −540.4K shares	Sold Off 0 shares
F Forest Avenue Capital Management LP Hedge Fund•Long/Short	−$42.6M −493.0K shares	Sold Off 0 shares
D D. E. Shaw & Co., Inc. Institution	−$39.6M −486.8K shares	$246.2M 3.0M shares
D DENDUR CAPITAL LP Hedge Fund•Event Driven	−$39.5M −485.8K shares	$218.7M 2.7M shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	−$39.0M −479.6K shares	$9.2M 112.9K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited ATI in Q3 2025

New Positions: 42
New Value: $117.5M
Exited Positions: 80
Exited Value: $545.5M

New Positions

Institution	Position Value
R Rokos Capital Management LLP Hedge Fund•Global Macro	$42.9M 527.3K shares
SIGNATURE ESTATE & INVESTMENT ADVISORS LLC RIA/Wealth	$11.7M 143.7K shares
B Bayberry Capital Partners LP Hedge Fund•Long/Short	$10.1M 124.1K shares
DISCOVERY CAPITAL MANAGEMENT, LLC / CT Hedge Fund•Global Macro	$8.5M 105.1K shares
F FACT Capital, LP Hedge Fund•Long/Short	$8.2M 101.4K shares
Lansforsakringar Fondforvaltning AB Fund of Funds	$5.6M 68.2K shares
D DYMON ASIA CAPITAL PTE. LTD. Institution	$3.4M 42.4K shares
Epoch Investment Partners, Inc. Long Only Manager	$3.2M 38.9K shares
B BI Asset Management Fondsmaeglerselskab A/S Institution	$2.8M 34.9K shares
Kovitz Investment Group Partners, LLC RIA/Wealth	$2.4M 29.0K shares

Exited Positions

Institution	Previous Position
P Palestra Capital Management LLC Hedge Fund•Long/Short	$91.7M 1.1M shares
FULLER & THALER ASSET MANAGEMENT, INC. Long Only Manager	$78.7M 911.1K shares
Castle Hook Partners LP Hedge Fund•Global Macro	$64.3M 744.6K shares
NorthRock Partners, LLC RIA/Wealth	$46.7M 540.4K shares
F Forest Avenue Capital Management LP Hedge Fund•Long/Short	$42.6M 493.0K shares
S SOROS FUND MANAGEMENT LLC Institution	$31.3M 362.7K shares
C Cubist Systematic Strategies, LLC Institution	$29.0M 335.9K shares
TWO SIGMA INVESTMENTS LLC Hedge Fund•Multi-Strategy	$22.2M 256.7K shares
N NATIXIS Institution	$17.6M 203.3K shares
Schonfeld Strategic Advisors LLC Hedge Fund•Multi-Strategy	$11.9M 137.4K shares

Options Activity

Institutions with the largest Call and Put options positions in ATI as of Q3 2025

Call Positions: 15
Call Value: $95.2M
Put Positions: 17
Put Value: $93.0M

Call Positions

Institution	Position Value
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	$31.9M 3.9K contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$22.9M 2.8K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$13.6M 1.7K contracts
S Squarepoint Ops LLC Hedge Fund•Quant	$8.2M 1.0K contracts
W WOLVERINE TRADING, LLC Institution	$5.0M 636.0 contracts
P PEAK6 LLC Institution	$3.8M 473.0 contracts
J JANE STREET GROUP, LLC Institution	$3.7M 455.0 contracts
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	$1.4M 174.0 contracts
C Cubist Systematic Strategies, LLC Institution	$1.4M 174.0 contracts
D D. E. Shaw & Co., Inc. Institution	$1.0M 123.0 contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$25.5M 3.1K contracts
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	$21.6M 2.7K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$20.8M 2.6K contracts
J JANE STREET GROUP, LLC Institution	$6.0M 738.0 contracts
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	$4.3M 528.0 contracts
W WOLVERINE TRADING, LLC Institution	$4.1M 518.0 contracts
Walleye Trading LLC RIA/Wealth	$2.6M 320.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$1.9M 235.0 contracts
C Cubist Systematic Strategies, LLC Institution	$1.8M 227.0 contracts
P PEAK6 LLC Institution	$1.6M 197.0 contracts

Most Committed Institutions

Institutions with ATI as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
D DENDUR CAPITAL LP Hedge Fund•Event Driven	Malcolm Andrew Levine CIO	24.39% $218.7M	1.95% 2.7M shares	Q3 2024 Held for 1y 2m	$897.0M
J JONES ROAD CAPITAL MANAGEMENT, L.P. Hedge Fund•Multi-Strategy	Aaron Nmn Wertentheil CEO	14.71% $6.7M	0.06% 82.7K shares	Q3 2024 Held for 1y 2m	$45.7M
Mountaineer Partners Management, LLC Hedge Fund•Long/Short	Mark M Lee Managing Partner	6.81% $11.7M	0.10% 144.0K shares	Q4 2018 Held for 6y 11m	$171.9M
L LTS One Management LP Institution	-	6.09% $17.1M	0.15% 210.0K shares	Q2 2025 Held for 5 months	$280.7M
C Candelo Capital Management LP Hedge Fund•Long/Short	John Cormac Mcmongale CIO	4.43% $5.0M	0.04% 60.9K shares	Q2 2025 Held for 5 months	$111.8M
F FACT Capital, LP Hedge Fund•Long/Short	Joyce S Meng Managing Partner	4.29% $8.2M	0.07% 101.4K shares	Q3 2025 Held for 2 months	$192.3M
B Bayberry Capital Partners LP Hedge Fund•Long/Short	Brian Cromwell Smith CFO	3.27% $10.1M	0.09% 124.1K shares	Q3 2025 Held for 2 months	$309.0M
KITZINGER LAUTMANN CAPITAL MANAGEMENT INC Long Only Manager	James Brian Kitzinger President	2.87% $28.8M	0.26% 353.8K shares	≤ Q2 2013 Held for 12y 5m+	$1.0B
LATEEF INVESTMENT MANAGEMENT, L.P. Long Only Manager	Quoc Kinh Tran Chairman	2.81% $23.5M	0.21% 289.4K shares	Q3 2025 Held for 2 months	$836.6M
B BOWEN HANES & CO INC Institution	-	2.77% $108.1M	0.96% 1.3M shares	Q1 2022 Held for 3y 8m	$3.9B