SIGA Technologies

SIGA • NASDAQ

SIGA Technologies is a drug manufacturers - specialty & generic company in the healthcare sector on NASDAQ, led by Diem Nguyen, Ph.D., MBA, with a market cap of $462.6M. As of Q3 2025, 47% of shares are held by 195 institutional investors, with BlackRock, Inc. as the largest holder at 4.92%.

Chief Executive OfficerDiem Nguyen, Ph.D., MBA

Market Cap$462.6M

Drug Manufacturers - Specialty & Generic

Healthcare

Employees45.0

Websitesiga.com

Country

United States of America

Overview

Overview of institutional ownership in SIGA as of Q3 2025 with a market cap of $655.2M

All Institutions

Institutions: 195
Value Held: $310.7M
Shares Held: 34.0M
Avg Position: $1.6M
Median Position: $212.7K

Hedge Funds

Hedge Funds: 20
Value Held: $34.4M
Shares Held: 3.8M
Avg Position: $1.7M
Median Position: $270.5K

Ownership Breakdown

Institutional (non-HF)

42.17%

$276.3M

Hedge Funds

5.25%

$34.4M

Retail & Other

52.59%

$344.5M

Based on market cap of $655.2M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in SIGA as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$32.3M 0.00% of portfolio	4.92% 3.5M shares	Q1 2018 Held for 7y 8m	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$24.3M 0.00% of portfolio	3.71% 2.7M shares	Q2 2018 Held for 7y 5m	$6.69T
DIMENSIONAL FUND ADVISORS LP Long Only Manager	David Paul Butler CEO	$22.3M 0.00% of portfolio	3.40% 2.4M shares	Q4 2018 Held for 6y 11m	$466.32B
A AltraVue Capital, LLC RIA/Wealth	Touk Sinantha Founder	$22.1M 1.83% of portfolio	3.38% 2.4M shares	Q4 2018 Held for 6y 11m	$1.2B
A AMERICAN CENTURY COMPANIES INC Institution	-	$11.3M 0.01% of portfolio	1.72% 1.2M shares	Q3 2021 Held for 4y 2m	$195.93B
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	Kenneth Cordele Griffin CEO	$10.3M 0.01% of portfolio	1.57% 1.1M shares	Q3 2018 Held for 7y 2m	$122.08B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$9.5M 0.00% of portfolio	1.44% 1.0M shares	Q2 2018 Held for 7y 5m	$2.88T
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$9.1M 0.00% of portfolio	1.39% 998.2K shares	Q2 2018 Held for 7y 5m	$1.57T
JUPITER ASSET MANAGEMENT LTD Long Only Manager	Matthew Charles Beesley CEO	$9.1M 0.08% of portfolio	1.38% 990.6K shares	Q3 2022 Held for 3y 2m	$11.6B
ARROWSTREET CAPITAL LIMITED PARTNERSHIP Hedge Fund•Quant	Anthony Ryan CEO	$7.6M 0.00% of portfolio	1.17% 834.7K shares	Q1 2024 Held for 1y 8m	$158.92B

Net Capital Flow

Institutional buying and selling activity for SIGA in Q3 2025

Traded: −$425.6K
Buyers: 106
Sellers: 71
Total Bought: +$35.5M
Total Sold: −$35.9M
Avg Position: $1.5M

Biggest Buyers

Institution	Net Bought	Current Position
AQR CAPITAL MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$3.0M +328.7K shares	$3.2M 348.1K shares
HENDERSON GROUP PLC Institution	+$2.5M +269.5K shares	$2.6M 289.1K shares
ARROWSTREET CAPITAL LIMITED PARTNERSHIP Hedge Fund•Quant	+$2.3M +255.9K shares	$7.6M 834.7K shares
C CSM Advisors, LLC Institution	+$2.2M +238.3K shares	$5.5M 596.5K shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$1.8M +199.9K shares	$2.3M 256.3K shares
JPMORGAN CHASE & CO Institution	+$1.7M +186.1K shares	$1.9M 211.1K shares
Brandywine Global Investment Management, LLC Long Only Manager	+$1.7M +181.6K shares	$1.7M 181.6K shares
VANGUARD GROUP INC Institution	+$1.3M +142.0K shares	$24.3M 2.7M shares
UBS Group AG Institution	+$1.3M +138.3K shares	$1.6M 173.0K shares
MORGAN STANLEY RIA/Wealth	+$1.2M +135.1K shares	$6.0M 657.0K shares

Biggest Sellers

Institution	Net Sold	Current Position
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC Long Only Manager	−$11.3M −1.2M shares	$7.6M 827.6K shares
GENERAL AMERICAN INVESTORS CO INC RIA/Wealth	−$3.5M −539.7K shares	Sold Off 0 shares
RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant	−$2.7M −290.4K shares	$2.8M 308.5K shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	−$2.5M −269.3K shares	$10.3M 1.1M shares
A AMERICAN CENTURY COMPANIES INC Institution	−$1.6M −172.4K shares	$11.3M 1.2M shares
R ROYAL BANK OF CANADA Institution	−$1.2M −134.3K shares	$727.9K 79.6K shares
LOS ANGELES CAPITAL MANAGEMENT & EQUITY RESEARCH INC Long Only Manager	−$1.1M −115.4K shares	$415.8K 45.4K shares
C Campbell & CO Investment Adviser LLC Hedge Fund•Quant Macro	−$1.1M −115.0K shares	$763.2K 83.4K shares
B BlackRock, Inc. Institution	−$932.9K −102.0K shares	$32.3M 3.5M shares
AMERIPRISE FINANCIAL INC Institution	−$863.9K −94.4K shares	$1.6M 172.5K shares

Entry and Exit Activity

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

New Positions: 11
New Value: $844.3K
Exited Positions: 17
Exited Value: $6.2M

New Positions

Institution	Position Value
P Petrus Trust Company, LTA Institution	$241.7K 26.4K shares
Graham Capital Management, L.P. Hedge Fund•Multi-Strategy	$168.0K 18.4K shares
P PharVision Advisers, LLC Hedge Fund•Long/Short	$137.8K 15.1K shares
Schonfeld Strategic Advisors LLC Hedge Fund•Multi-Strategy	$129.0K 14.1K shares
One Wealth Advisors, LLC RIA/Wealth	$106.3K 11.6K shares
S State of Alaska, Department of Revenue Institution	$34.5K 3.8K shares
CURIO WEALTH, LLC RIA/Wealth	$18.3K 2.0K shares
SJS Investment Consulting Inc. RIA/Wealth	$4.2K 455.0 shares
O Optiver Holding B.V. Institution	$4.1K 450.0 shares
Triumph Capital Management RIA/Wealth	$229.0 25.0 shares

Exited Positions

Institution	Previous Position
GENERAL AMERICAN INVESTORS CO INC RIA/Wealth	$3.5M 539.7K shares
TWO SIGMA INVESTMENTS LLC Hedge Fund•Multi-Strategy	$741.6K 113.7K shares
DAVENPORT & Co LLC RIA/Wealth	$326.0K 50.0K shares
H HRT FINANCIAL LLC Institution	$306.7K 47.0K shares
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$238.5K 36.6K shares
TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy	$209.3K 32.1K shares
B Brevan Howard Capital Management LP Institution	$188.7K 28.9K shares
K Kapitalo Investimentos Ltda Institution	$183.1K 28.1K shares
O OXFORD ASSET MANAGEMENT Institution	$176.8K 27.1K shares
Eqis Capital Management, Inc. RIA/Wealth	$109.5K 16.8K shares

Options Activity

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

Call Positions: 4
Call Value: $682.6K
Put Positions: 2
Put Value: $208.6K

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$504.2K 551.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$161.0K 176.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$17.4K 19.0 contracts
W WOLVERINE TRADING, LLC Institution	- - contracts

Put Positions

Institution	Position Value
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$186.7K 204.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$22.0K 24.0 contracts

Most Committed Institutions

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

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
A AltraVue Capital, LLC RIA/Wealth	Touk Sinantha Founder	1.83% $22.1M	3.38% 2.4M shares	Q4 2018 Held for 6y 11m	$1.2B
FIRST WILSHIRE SECURITIES MANAGEMENT INC RIA/Wealth	Howard Haoming Lu CEO	1.67% $6.3M	0.96% 687.9K shares	Q2 2022 Held for 3y 5m	$375.8M
Penn Mutual Asset Management, LLC Insurance Manager	David Michael O'Malley Chairman	0.86% $350.3K	0.05% 38.3K shares	Q2 2024 Held for 1y 5m	$40.7M
SummerHaven Investment Management, LLC Long Only Manager	Kurt Jonathon Nelson CEO	0.66% $1.1M	0.17% 122.7K shares	Q3 2024 Held for 1y 2m	$170.9M
Legato Capital Management LLC Fund of Funds	Victor Louis Hymes CEO	0.51% $4.7M	0.72% 512.0K shares	Q2 2023 Held for 2y 5m	$915.6M
C Corton Capital Inc. Institution	-	0.45% $181.4K	0.03% 19.8K shares	Q1 2025 Held for 8 months	$40.6M
DENALI ADVISORS LLC Long Only Manager	Robert Guenther Snigaroff CIO	0.37% $3.3M	0.50% 360.3K shares	Q2 2024 Held for 1y 5m	$885.1M
Uniplan Investment Counsel, Inc. RIA/Wealth	Kris Hunter Jamison CEO	0.37% $3.6M	0.55% 396.5K shares	Q2 2022 Held for 3y 5m	$983.7M
October Effect Ltd RIA/Wealth	Frank David Tehel Managing Partner	0.26% $234.8K	0.04% 25.7K shares	Q2 2025 Held for 5 months	$90.6M
Significant Wealth Partners LLC RIA/Wealth	Brian William Atkins President	0.20% $406.7K	0.06% 44.5K shares	Q4 2024 Held for 11 months	$204.6M