Larimar Therapeutics

LRMR • NASDAQ

Larimar Therapeutics is a biotechnology company in the healthcare sector on NASDAQ, led by Carole Ben-Maimon, M.D., with a market cap of $346.6M. As of Q3 2025, 99% of shares are held by 136 institutional investors, with DEERFIELD MANAGEMENT CO /NY as the largest holder at 35.76%.

Chief Executive OfficerCarole Ben-Maimon, M.D.

Market Cap$346.6M

Biotechnology

Healthcare

Employees42.0

Websitelarimartx.com

Country

United States of America

Overview

Overview of institutional ownership in LRMR as of Q3 2025 with a market cap of $276.5M

All Institutions

Institutions: 136
Value Held: $273.6M
Shares Held: 85.1M
Avg Position: $2.0M
Median Position: $116.1K

Hedge Funds

Hedge Funds: 29
Value Held: $201.5M
Shares Held: 62.8M
Avg Position: $6.9M
Median Position: $1.8M

Ownership Breakdown

Institutional (non-HF)

26.09%

$72.1M

Hedge Funds

72.87%

$201.5M

Retail & Other

1.04%

$2.9M

Based on market cap of $276.5M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in LRMR as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
DEERFIELD MANAGEMENT CO /NY Hedge Fund•Long/Short	James Edward Flynn President	$98.9M 1.64% of portfolio	35.76% 30.6M shares	Q2 2020 Held for 5y 5m	$6.0B
RA CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short	Michael Saulnier CFO	$19.5M 0.24% of portfolio	7.06% 6.0M shares	Q1 2024 Held for 1y 8m	$8.1B
B Blue Owl Capital Holdings LP Institution	-	$18.9M 5.93% of portfolio	6.84% 5.9M shares	Q4 2023 Held for 1y 11m	$318.8M
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	Dan Michael Berkovitz Chairman	$15.8M 0.01% of portfolio	5.72% 4.9M shares	Q1 2024 Held for 1y 8m	$121.98B
B BlackRock, Inc. Institution	-	$10.8M 0.00% of portfolio	3.90% 3.3M shares	Q2 2020 Held for 5y 5m	$5.67T
O Opaleye Management Inc. Hedge Fund•Long/Short	James Aaron Silverman President	$10.6M 1.50% of portfolio	4.35% 3.7M shares	Q1 2025 Held for 8 months	$702.7M
RTW INVESTMENTS, LLC Hedge Fund•Sector	Peter M Fong President	$10.1M 0.13% of portfolio	3.65% 3.1M shares	Q3 2025 Held for 2 months	$8.1B
VANGUARD GROUP INC Institution	Salim Ramji CEO	$10.0M 0.00% of portfolio	3.61% 3.1M shares	Q2 2020 Held for 5y 5m	$6.69T
A ADAGE CAPITAL PARTNERS GP LLC Institution	-	$6.1M 0.01% of portfolio	2.22% 1.9M shares	Q3 2025 Held for 2 months	$63.0B
A Alyeska Investment Group, L.P. Hedge Fund•Multi-Strategy	Anand Christopher Parekh CEO	$6.1M 0.02% of portfolio	2.20% 1.9M shares	Q1 2024 Held for 1y 8m	$33.0B

Net Capital Flow

Institutional buying and selling activity for LRMR in Q3 2025

Traded: +$74.8M
Buyers: 89
Sellers: 34
Total Bought: +$87.6M
Total Sold: −$12.8M
Avg Position: $1.9M

Biggest Buyers

Institution	Net Bought	Current Position
DEERFIELD MANAGEMENT CO /NY Hedge Fund•Long/Short	+$30.3M +9.4M shares	$98.9M 30.6M shares
RTW INVESTMENTS, LLC Hedge Fund•Sector	+$10.1M +3.1M shares	$10.1M 3.1M shares
A ADAGE CAPITAL PARTNERS GP LLC Institution	+$6.1M +1.9M shares	$6.1M 1.9M shares
GOLDMAN SACHS GROUP INC Institution	+$4.7M +1.4M shares	$5.1M 1.6M shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$4.0M +1.2M shares	$15.8M 4.9M shares
Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy	+$4.0M +1.2M shares	$4.0M 1.2M shares
Woodline Partners LP Hedge Fund•Long/Short	+$3.2M +1.0M shares	$5.2M 1.6M shares
A AIGH Capital Management LLC Hedge Fund•Long/Short	+$3.2M +1.0M shares	$3.2M 1.0M shares
VANGUARD GROUP INC Institution	+$3.1M +945.8K shares	$10.0M 3.1M shares
B Blue Owl Capital Holdings LP Institution	+$3.0M +925.0K shares	$18.9M 5.9M shares

Biggest Sellers

Institution	Net Sold	Current Position
TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy	−$2.9M −894.6K shares	$815.2K 252.4K shares
TWO SIGMA INVESTMENTS LLC Hedge Fund•Multi-Strategy	−$2.5M −768.9K shares	$435.2K 134.7K shares
O Opaleye Management Inc. Hedge Fund•Long/Short	−$1.1M −389.1K shares	$10.6M 3.7M shares
MANGROVE PARTNERS Hedge Fund•Multi-Strategy	−$1.1M −328.0K shares	$1.4M 442.2K shares
UBS OCONNOR LLC Long Only Manager	−$887.8K −307.2K shares	Sold Off 0 shares
A Assenagon Asset Management S.A. Institution	−$742.3K −256.9K shares	Sold Off 0 shares
A Alyeska Investment Group, L.P. Hedge Fund•Multi-Strategy	−$609.5K −188.7K shares	$6.1M 1.9M shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	−$577.8K −178.9K shares	$230.7K 71.4K shares
N Nuveen, LLC Institution	−$393.5K −121.8K shares	$339.7K 105.2K shares
X XTX Topco Ltd Institution	−$371.6K −115.0K shares	$169.2K 52.4K shares

Entry and Exit Activity

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

New Positions: 12
New Value: $4.1M
Exited Positions: 8
Exited Value: $2.1M

New Positions

Institution	Position Value
A AIGH Capital Management LLC Hedge Fund•Long/Short	$3.2M 1.0M shares
C CANTOR FITZGERALD, L. P. Institution	$411.8K 127.5K shares
Creative Planning RIA/Wealth	$207.6K 64.3K shares
S Stonepine Capital Management, LLC Institution	$80.8K 25.0K shares
Ellevest, Inc. RIA/Wealth	$60.8K 18.8K shares
COLDSTREAM CAPITAL MANAGEMENT INC RIA/Wealth	$56.6K 17.5K shares
B B.O.S.S. Retirement Advisors, LLC RIA/Wealth	$41.1K 12.7K shares
Pallas Capital Advisors LLC RIA/Wealth	$34.8K 10.8K shares
Strategic Advocates LLC RIA/Wealth	$7.6K 2.4K shares
O Optiver Holding B.V. Institution	$1.8K 560.0 shares

Exited Positions

Institution	Previous Position
UBS OCONNOR LLC Long Only Manager	$887.8K 307.2K shares
A Assenagon Asset Management S.A. Institution	$742.3K 256.9K shares
WEXFORD CAPITAL LP Hedge Fund•Multi-Strategy	$201.7K 69.8K shares
STATE OF WISCONSIN INVESTMENT BOARD RIA/Wealth	$91.1K 31.5K shares
ALGERT COLDIRON INVESTORS LLC Hedge Fund•Quant	$83.9K 29.0K shares
ING INVESTMENT MANAGEMENT LLC Insurance Manager	$34.9K 12.1K shares
RAYMOND JAMES FINANCIAL INC RIA/Wealth	$23.1K 8.0K shares
Goss Wealth Management LLC RIA/Wealth	$11.9K 4.1K shares

Options Activity

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

Call Positions: 11
Call Value: $19.6M
Put Positions: 4
Put Value: $2.0M

Call Positions

Institution	Position Value
Logos Global Management LP Hedge Fund•Long/Short	$8.1M 25.0K contracts
Caption Management, LLC Hedge Fund•Long/Short	$5.0M 15.4K contracts
Ikarian Capital, LLC Hedge Fund•Event Driven	$1.8M 5.5K contracts
Hudson Bay Capital Management LP Hedge Fund•Multi-Strategy	$1.6M 5.0K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$930.9K 2.9K contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$726.1K 2.2K contracts
BOOTHBAY FUND MANAGEMENT, LLC Fund of Funds	$644.7K 2.0K contracts
J J. Goldman & Co LP Hedge Fund•Multi-Strategy	$436.1K 1.4K contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$226.1K 700.0 contracts
DLD Asset Management, LP Hedge Fund•Multi-Strategy	$142.9K 443.0 contracts

Put Positions

Institution	Position Value
Hudson Bay Capital Management LP Hedge Fund•Multi-Strategy	$1.2M 3.8K contracts
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$355.3K 1.1K contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$321.7K 996.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$113.1K 350.0 contracts

Most Committed Institutions

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

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
B Blue Owl Capital Holdings LP Institution	-	5.93% $18.9M	6.84% 5.9M shares	Q4 2023 Held for 1y 11m	$318.8M
DEERFIELD MANAGEMENT CO /NY Hedge Fund•Long/Short	James Edward Flynn President	1.64% $98.9M	35.76% 30.6M shares	Q2 2020 Held for 5y 5m	$6.0B
O Opaleye Management Inc. Hedge Fund•Long/Short	James Aaron Silverman President	1.50% $10.6M	4.35% 3.7M shares	Q1 2025 Held for 8 months	$702.7M
A AIGH Capital Management LLC Hedge Fund•Long/Short	Orin Zvi Hirschman Managing Partner	1.02% $3.2M	1.17% 1.0M shares	Q3 2025 Held for 2 months	$317.0M
D DAFNA Capital Management LLC Hedge Fund•Event Driven	Nathan Fischel CEO	0.83% $3.3M	1.20% 1.0M shares	Q2 2020 Held for 5y 5m	$397.7M
Caption Management, LLC Hedge Fund•Long/Short	William Lamblè Cooper CEO	0.25% $4.2M	1.53% 1.3M shares	Q4 2024 Held for 11 months	$1.7B
RA CAPITAL MANAGEMENT, LLC Hedge Fund•Long/Short	Michael Saulnier CFO	0.24% $19.5M	7.06% 6.0M shares	Q1 2024 Held for 1y 8m	$8.1B
S SPHERA FUNDS MANAGEMENT LTD. Institution	-	0.20% $841.0K	0.30% 260.4K shares	Q2 2024 Held for 1y 5m	$416.3M
M Massar Capital Management, LP Institution	-	0.14% $377.9K	0.14% 117.0K shares	Q2 2025 Held for 5 months	$269.6M
RTW INVESTMENTS, LLC Hedge Fund•Sector	Peter M Fong President	0.13% $10.1M	3.65% 3.1M shares	Q3 2025 Held for 2 months	$8.1B