American Century Companies
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American Century Companies’s SIGA Technologies SIGA Stock Holding History

American Century Companies’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 		$7.05M Buy
1,317,784
+152,295
+13% +$950K ﹤0.01% 1615
2025
Q4 		$7.12M Sell
1,165,489
-67,243
-5% -$478K ﹤0.01% 1591
2025
Q3 		$11.3M Sell
1,232,732
-172,442
-12% -$1.38M 0.01% 1379
2025
Q2 		$9.16M Buy
1,405,174
+34,514
+3% +$207K 0.01% 1410
2025
Q1 		$7.51M Buy
1,370,660
+98,688
+8% +$584K ﹤0.01% 1429
2024
Q4 		$7.64M Buy
1,271,972
+114,270
+10% +$764K ﹤0.01% 1437
2024
Q3 		$7.81M Buy
1,157,702
+315,943
+38% +$2.76M ﹤0.01% 1410
2024
Q2 		$6.39M Buy
841,759
+602,091
+251% +$4.9M ﹤0.01% 1424
2024
Q1 		$2.05M Sell
239,668
-9,134
-4% -$52.1K ﹤0.01% 1878
2023
Q4 		$1.39M Sell
248,802
-59,474
-19% -$319K ﹤0.01% 1939
2023
Q3 		$1.62M Sell
308,276
-72,368
-19% -$357K ﹤0.01% 1798
2023
Q2 		$1.92M Sell
380,644
-50,042
-12% -$284K ﹤0.01% 1669
2023
Q1 		$2.4M Buy
430,686
+66,766
+18% +$446K ﹤0.01% 1548
2022
Q4 		$2.68M Sell
363,920
-38,471
-10% -$337K ﹤0.01% 1465
2022
Q3 		$4.14M Buy
402,391
+190,156
+90% +$3.06M ﹤0.01% 1184
2022
Q2 		$2.46M Buy
212,235
+124,927
+143% +$1.13M ﹤0.01% 1353
2022
Q1 		$619K Buy
87,308
+24,550
+39% +$164K ﹤0.01% 1870
2021
Q4 		$472K Buy
62,758
+48,695
+346% +$371K ﹤0.01% 1964
2021
Q3 		$104K Buy
+14,063
New +$90.1K ﹤0.01% 2234
2019
Q2 		– Sell
-14,327
Closed -$86K – 1338
2019
Q1 		$86K Buy
+14,327
New +$96.1K ﹤0.01% 1212

Other funds holding SIGA

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
AC
AltraVue Capital Bellevue, Washington $1.16B AUM 46.45% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Arrowstreet Capital
Arrowstreet Capital Boston, Massachusetts $185B AUM 39.58% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return
State Street
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
Hotchkis & Wiley Capital Management
Hotchkis & Wiley Capital Management Los Angeles, California $32.4B AUM 17.21% 1-Year Est. Return

American Century Companies's SIGA Position: Q1 2026 in Review

American Century Companies increased its SIGA Technologies (SIGA) stake by 13% in Q1 2026, buying an estimated $950K and bringing the position to 1,317,784 shares worth $7.05M. The position accounts for ﹤0.01% of the portfolio, ranked #1615.

American Century Companies first reported a position in SIGA in Q1 2019 and has held it in 20 quarters since. The position peaked at $11.3M in Q3 2025. 183 funds tracked by Wall St. Rank hold SIGA as of Q1 2026.

  • American Century Companies held 1,317,784 shares of SIGA Technologies worth $7.05M as of Q1 2026.
  • American Century Companies bought 152,295 SIGA Technologies shares in Q1 2026, an estimated $950K.
  • SIGA Technologies made up ﹤0.01% of American Century Companies's portfolio in Q1 2026, its #1615 holding.
  • American Century Companies first reported a position in SIGA Technologies in Q1 2019 and has held it in 20 quarters since.
  • American Century Companies's SIGA Technologies position peaked at $11.3M in Q3 2025.
  • 183 funds tracked by Wall St. Rank held SIGA Technologies as of Q1 2026.

Based on American Century Companies's 13F filing for Q1 2026, filed 15 May 2026.