Harbor Capital Advisors’s SIGA Technologies SIGA Stock Holding History

Harbor Capital Advisors’s Portfolio SIGA Stock Details SIGA Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$4K	Buy	689 +75	+12%	+$468	﹤0.01%	1168
2025 Q4	$4K	Sell	614 -11	-2%	-$78	﹤0.01%	1211
2025 Q3	$6K	Sell	625 -135,832	-100%	-$1.09M	﹤0.01%	1125
2025 Q2	$890K	Sell	136,457 -85,555	-39%	-$513K	0.04%	453
2025 Q1	$1.22M	Buy	222,012 +53,534	+32%	+$317K	0.06%	399
2024 Q4	$1.01M	Buy	168,478 +5,772	+4%	+$38.6K	0.04%	447
2024 Q3	$1.1M	Buy	+162,706	New	+$1.42M	0.05%	443

Other funds holding SIGA

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

AltraVue Capital Bellevue, Washington $1.16B AUM 46.45% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Arrowstreet Capital Boston, Massachusetts $185B AUM 39.58% 1-Year Est. Return

American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

FWSM

First Wilshire Securities Management Pasadena, California $444M AUM 42.88% 1-Year Est. Return

Harbor Capital Advisors's SIGA Position: Q1 2026 in Review

Harbor Capital Advisors increased its SIGA Technologies (SIGA) stake by 12% in Q1 2026, buying an estimated $468 and bringing the position to 689 shares worth $4K. The position accounts for ﹤0.01% of the portfolio, ranked #1168.

Harbor Capital Advisors first reported a position in SIGA in Q3 2024 and has held it in 7 quarters since. The position peaked at $1.22M in Q1 2025. 183 funds tracked by Wall St. Rank hold SIGA as of Q1 2026.

Harbor Capital Advisors held 689 shares of SIGA Technologies worth $4K as of Q1 2026.
Harbor Capital Advisors bought 75 SIGA Technologies shares in Q1 2026, an estimated $468.
SIGA Technologies made up ﹤0.01% of Harbor Capital Advisors's portfolio in Q1 2026, its #1168 holding.
Harbor Capital Advisors first reported a position in SIGA Technologies in Q3 2024 and has held it in 7 quarters since.
Harbor Capital Advisors's SIGA Technologies position peaked at $1.22M in Q1 2025.
183 funds tracked by Wall St. Rank held SIGA Technologies as of Q1 2026.

Based on Harbor Capital Advisors's 13F filing for Q1 2026, filed 28 Apr 2026.