Axcelis Technologies

ACLS • NASDAQ

Axcelis Technologies is a semiconductors company in the technology sector on NASDAQ, led by Russell J. Low, with a market cap of $2.7B. As of Q3 2025, 96% of shares are held by 350 institutional investors, with BlackRock, Inc. as the largest holder at 15.48%.

Chief Executive Officer and PresidentRussell J. Low

Market Cap$2.7B

Semiconductors

Technology

Employees1.7K

Websiteaxcelis.com

Country

United States of America

Overview

Overview of institutional ownership in ACLS as of Q3 2025 with a market cap of $3.1B

All Institutions

Institutions: 350
Value Held: $3.0B
Shares Held: 30.3M
Avg Position: $8.4M
Median Position: $576.6K

Hedge Funds

Hedge Funds: 35
Value Held: $117.0M
Shares Held: 1.2M
Avg Position: $3.3M
Median Position: $1.0M

Ownership Breakdown

Institutional (non-HF)

92.42%

$2.8B

Hedge Funds

3.81%

$117.0M

Retail & Other

3.76%

$115.5M

Based on market cap of $3.1B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in ACLS as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$474.9M 0.01% of portfolio	15.48% 4.9M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$408.7M 0.01% of portfolio	13.32% 4.2M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
REINHART MAHONEY CAPITAL MANAGEMENT INC Long Only Manager	James Everett Reinhart CEO	$157.2M 5.11% of portfolio	5.13% 1.6M shares	Q1 2024 Held for 1y 8m	$3.1B
A AMERICAN CENTURY COMPANIES INC Institution	-	$131.4M 0.07% of portfolio	4.28% 1.3M shares	Q1 2021 Held for 4y 8m	$195.93B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$120.1M 0.00% of portfolio	3.92% 1.2M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
B BNP Paribas Investment Partners S.A. Institution	-	$90.8M 0.24% of portfolio	2.96% 930.4K shares	Q4 2021 Held for 3y 11m	$37.9B
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$90.5M 0.01% of portfolio	2.95% 926.7K shares	≤ Q2 2013 Held for 12y 5m+	$1.57T
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	David Craig Brown CEO	$90.2M 0.06% of portfolio	3.09% 972.2K shares	Q4 2014 Held for 10y 11m	$158.22B
PRIMECAP MANAGEMENT CO/CA/ Long Only Manager	Theofanis A Kolokotrones Chairman	$81.4M 0.06% of portfolio	2.65% 833.7K shares	Q1 2014 Held for 11y 8m	$128.84B
DIMENSIONAL FUND ADVISORS LP Long Only Manager	David Paul Butler CEO	$75.1M 0.02% of portfolio	2.45% 769.6K shares	≤ Q2 2013 Held for 12y 5m+	$466.32B

Net Capital Flow

Institutional buying and selling activity for ACLS in Q3 2025

Traded: −$77.3M
Buyers: 183
Sellers: 144
Total Bought: +$250.2M
Total Sold: −$327.4M
Avg Position: $7.7M

Biggest Buyers

Institution	Net Bought	Current Position
L LSV ASSET MANAGEMENT Long Only Manager	+$30.7M +314.9K shares	$30.7M 314.9K shares
Invesco Ltd. ETF Provider	+$24.1M +246.9K shares	$37.8M 386.7K shares
FMR LLC Institution	+$16.5M +168.8K shares	$53.8M 551.4K shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$15.1M +154.4K shares	$25.6M 261.8K shares
HENDERSON GROUP PLC Institution	+$13.5M +138.2K shares	$23.0M 235.4K shares
ARROWSTREET CAPITAL LIMITED PARTNERSHIP Hedge Fund•Quant	+$11.5M +117.8K shares	$11.5M 117.8K shares
Allspring Global Investments Holdings, LLC Long Only Manager	+$9.7M +102.0K shares	$10.4M 109.6K shares
REINHART MAHONEY CAPITAL MANAGEMENT INC Long Only Manager	+$9.0M +91.8K shares	$157.2M 1.6M shares
B BNP PARIBAS ARBITRAGE, SA Institution	+$9.0M +91.7K shares	$27.7M 283.9K shares
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	+$7.9M +85.4K shares	$90.2M 972.2K shares

Biggest Sellers

Institution	Net Sold	Current Position
B BTIM Corp. Institution	−$37.7M −385.6K shares	$44.9M 460.3K shares
A AMERICAN CENTURY COMPANIES INC Institution	−$30.6M −313.7K shares	$131.4M 1.3M shares
BANK OF AMERICA CORP /DE/ Institution	−$28.6M −293.1K shares	$40.1M 410.3K shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	−$22.2M −227.7K shares	$2.6M 26.8K shares
VOLORIDGE INVESTMENT MANAGEMENT, LLC Hedge Fund•Multi-Strategy	−$21.1M −216.6K shares	$9.3M 95.2K shares
BlackBarn Capital Partners LP Hedge Fund•Multi-Strategy	−$15.6M −160.0K shares	$19.5M 200.0K shares
B BlackRock, Inc. Institution	−$15.4M −157.8K shares	$474.9M 4.9M shares
VANGUARD GROUP INC Institution	−$13.5M −138.2K shares	$408.7M 4.2M shares
R ROYCE & ASSOCIATES LLC Institution	−$11.7M −120.3K shares	$14.1M 144.7K shares
GOLDMAN SACHS GROUP INC Institution	−$9.4M −96.4K shares	$48.3M 494.8K shares

Entry and Exit Activity

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

New Positions: 27
New Value: $13.2M
Exited Positions: 34
Exited Value: $22.3M

New Positions

Institution	Position Value
O OSSIAM Institution	$4.0M 40.7K shares
F/M Investments LLC ETF Provider	$2.1M 21.1K shares
O Old West Investment Management, LLC Hedge Fund•Multi-Strategy	$1.6M 16.3K shares
R Rede Wealth, LLC RIA/Wealth	$1.1M 11.5K shares
Morningstar Investment Management LLC Long Only Manager	$979.0K 10.0K shares
Horizon Investments, LLC/SC Long Only Manager	$702.4K 7.2K shares
Veracity Capital LLC RIA/Wealth	$597.0K 6.1K shares
Merit Financial Group, LLC RIA/Wealth	$595.0K 6.1K shares
LEAVELL INVESTMENT MANAGEMENT, INC. RIA/Wealth	$268.0K 2.7K shares
V Vise Technologies, Inc. Institution	$266.9K 2.7K shares

Exited Positions

Institution	Previous Position
Trexquant Investment LP Hedge Fund•Quant	$5.6M 81.0K shares
Aquatic Capital Management LLC Hedge Fund•Quant	$2.4M 34.6K shares
Optimize Financial Inc RIA/Wealth	$2.2M 32.0K shares
R RICE HALL JAMES & ASSOCIATES, LLC Long Only Manager	$2.2M 31.7K shares
R Ruffer LLP Long Only Manager	$1.7M 24.7K shares
LEUCADIA NATIONAL CORP Institution	$1.3M 18.1K shares
T TEXAS PERMANENT SCHOOL FUND Institution	$1.1M 15.2K shares
Q Qube Research & Technologies Ltd Institution	$855.0K 12.3K shares
RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant	$759.6K 10.9K shares
Numerai GP LLC Hedge Fund•Quant	$731.0K 10.5K shares

Options Activity

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

Call Positions: 11
Call Value: $27.3M
Put Positions: 10
Put Value: $28.2M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$10.3M 1.1K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$8.7M 896.0 contracts
W WOLVERINE TRADING, LLC Institution	$3.6M 375.0 contracts
J JANE STREET GROUP, LLC Institution	$1.5M 157.0 contracts
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	$1.1M 117.0 contracts
Walleye Trading LLC RIA/Wealth	$585.8K 60.0 contracts
P PEAK6 LLC Institution	$498.0K 51.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$380.8K 39.0 contracts
D D. E. Shaw & Co., Inc. Institution	$273.4K 28.0 contracts
S Squarepoint Ops LLC Hedge Fund•Quant	$234.3K 24.0 contracts

Put Positions

Institution	Position Value
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$8.5M 866.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$7.0M 713.0 contracts
P PEAK6 LLC Institution	$5.4M 548.0 contracts
J JANE STREET GROUP, LLC Institution	$3.2M 323.0 contracts
D D. E. Shaw & Co., Inc. Institution	$1.9M 199.0 contracts
W WOLVERINE TRADING, LLC Institution	$1.3M 131.0 contracts
Walleye Trading LLC RIA/Wealth	$517.5K 53.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$292.9K 30.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$273.4K 28.0 contracts
CAPITAL FUND MANAGEMENT S.A. Hedge Fund•Quant Macro	- - contracts

Most Committed Institutions

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

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
BlackBarn Capital Partners LP Hedge Fund•Multi-Strategy	Jeremy Jason Edelstein CFO	6.82% $19.5M	0.64% 200.0K shares	Q4 2024 Held for 11 months	$286.2M
REINHART MAHONEY CAPITAL MANAGEMENT INC Long Only Manager	James Everett Reinhart CEO	5.11% $157.2M	5.13% 1.6M shares	Q1 2024 Held for 1y 8m	$3.1B
Q QSM Asset Management Ltd Institution	-	3.69% $5.2M	0.17% 53.2K shares	Q2 2025 Held for 5 months	$140.0M
S Soviero Asset Management, LP Hedge Fund•Long/Short	Thomas E King CFO	1.87% $3.0M	0.10% 31.0K shares	Q2 2025 Held for 5 months	$161.8M
Penbrook Management LLC RIA/Wealth	Robert Stephen Anderson Managing Partner	1.15% $1.6M	0.05% 16.9K shares	Q4 2017 Held for 7y 11m	$143.0M
Jackson Square Partners, LLC Long Only Manager	Kenneth Farnham Broad Chairman	1.08% $2.7M	0.09% 27.3K shares	Q4 2023 Held for 1y 11m	$247.3M
New Insight Wealth Advisors RIA/Wealth	Josephine H Lee CCO	1.02% $2.6M	0.09% 27.0K shares	Q1 2025 Held for 8 months	$259.5M
R Rede Wealth, LLC RIA/Wealth	Stephen James Mcnaughton CEO	0.90% $1.1M	0.04% 11.5K shares	Q3 2025 Held for 2 months	$124.1M
Eagle Bay Advisors LLC Family Office	Michael David Nelson CEO	0.90% $1.1M	0.04% 11.5K shares	Q2 2021 Held for 4y 5m	$124.1M
GLOBEFLEX CAPITAL L P Long Only Manager	Marina Loretta Marrelli CEO	0.85% $5.5M	0.18% 56.0K shares	Q3 2017 Held for 8y 2m	$644.8M