Siga Technologies Inc (SIGA) Institutional Ownership

Ownership Summary

According to SEC filings for the period ending September 2025, Siga Technologies Inc (NASDAQ:SIGA) is held by 197 institutional firms.

• Institutional ownership in Siga Technologies edged up to 46.5% in September 2025, compared to 45.6% in June 2025.
• On a quarter-over-quarter basis, institutional holdings shifted by 5.96%, with a year-over-year an increase of 15.88% in the count of filers.
• Among the 197 institutional holders of Siga Technologies, 105 added to their stakes while 56 trimmed their positions and 36 held steady.
• The total number of shares held by institutions in Siga Technologies increased to 33.98Mn as of September 2025, a net change of up by 1.91Mn shares quarter on quarter, and down 1.69Mn shares year over year.
• As of September 30, 2025, BlackRock, Inc. held Siga Technologies's largest shareholding position with over 3.53Mn shares, representing 4.83% of total outstanding shares.
• Among the most significant buyers of Siga Technologies during September 2025 were CITADEL ADVISORS LLC (1.13Mn), AQR CAPITAL MANAGEMENT LLC (328.73K), JANUS HENDERSON GROUP PLC (269.51K), ARROWSTREET CAPITAL, LIMITED PARTNERSHIP (255.90K), CSM Advisors, LLC (238.25K).
• Leading sellers of Siga Technologies stock in September 2025 included HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC (1.24Mn), RENAISSANCE TECHNOLOGIES LLC (290.41K), AMERICAN CENTURY COMPANIES INC (172.44K), HARBOR CAPITAL ADVISORS, INC. (135.83K), ROYAL BANK OF CANADA (134.29K).
• The top 10 institutional holders of Siga Technologies for the quarter ending September 2025 included BlackRock, Inc. (3.53Mn), VANGUARD GROUP INC (2.66Mn), DIMENSIONAL FUND ADVISORS LP (2.43Mn), AltraVue Capital, LLC (2.42Mn), AMERICAN CENTURY COMPANIES INC (1.23Mn), CITADEL ADVISORS LLC (1.13Mn), STATE STREET CORP (1.03Mn), GEODE CAPITAL MANAGEMENT, LLC (998.22K), JUPITER ASSET MANAGEMENT LTD (990.65K), ARROWSTREET CAPITAL, LIMITED PARTNERSHIP (834.68K).