Acadian Asset Management
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Acadian Asset Management’s Spero Therapeutics SPRO Stock Holding History

Acadian Asset Management’s Portfolio SPRO Stock Details SPRO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q3 		– Sell
-112,889
Closed -$327K – 1995
2025
Q2 		$327K Sell
112,889
-758,323
-87% -$1.09M ﹤0.01% 1220
2025
Q1 		$626K Sell
871,212
-168,710
-16% -$142K ﹤0.01% 1035
2024
Q4 		$1.07M Sell
1,039,922
-31,938
-3% -$38K ﹤0.01% 912
2024
Q3 		$1.44M Hold
1,071,860
– – ﹤0.01% 837
2024
Q2 		$1.39M Buy
1,071,860
+309,262
+41% +$466K ﹤0.01% 887
2024
Q1 		$1.31M Buy
762,598
+418,742
+122% +$656K ﹤0.01% 774
2023
Q4 		$505K Buy
343,856
+71,832
+26% +$85.6K ﹤0.01% 1026
2023
Q3 		$327K Buy
272,024
+98,485
+57% +$136K ﹤0.01% 1102
2023
Q2 		$250K Buy
+173,539
New +$297K ﹤0.01% 1222
2022
Q4 		– Sell
-61,152
Closed -$121K – 1909
2022
Q3 		$121K Sell
61,152
-33,825
-36% -$33.6K ﹤0.01% 1320
2022
Q2 		$70K Buy
+94,977
New +$276K ﹤0.01% 1436
2019
Q3 		– Sell
-2,204
Closed -$25K – 1995
2019
Q2 		$25K Buy
+2,204
New +$26.5K ﹤0.01% 1578
2018
Q3 		– Sell
-3,837
Closed -$56K – 1786
2018
Q2 		$56K Buy
+3,837
New +$49.1K ﹤0.01% 1368

Other funds holding SPRO

P
Pfizer New York $170M AUM 191.09% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
AFM
Anson Funds Management Dallas, Texas $1.68B AUM 373.57% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return
AI
Alphabet Inc Mountain View, California $99.1B AUM 124.46% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
EI
EAM Investors Solana Beach, California $1.12B AUM 390.6% 1-Year Est. Return
ICM
Ionic Capital Management New York $690M AUM 70.34% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Acadian Asset Management's SPRO Position: Q3 2025 in Review

Acadian Asset Management sold out of Spero Therapeutics (SPRO) in Q3 2025, closing a stake of 112,889 shares — an estimated $327K sold.

Acadian Asset Management first reported a position in SPRO in Q2 2018 and held it in 13 quarters. The position peaked at $1.44M in Q3 2024. 47 funds tracked by Wall St. Rank hold SPRO as of Q3 2025.

  • Acadian Asset Management reported no remaining Spero Therapeutics position as of Q3 2025 after selling out during the quarter.
  • Acadian Asset Management sold 112,889 Spero Therapeutics shares in Q3 2025, an estimated $327K.
  • Acadian Asset Management first reported a position in Spero Therapeutics in Q2 2018 and held it in 13 quarters.
  • Acadian Asset Management's Spero Therapeutics position peaked at $1.44M in Q3 2024.
  • 47 funds tracked by Wall St. Rank held Spero Therapeutics as of Q3 2025.

Based on Acadian Asset Management's 13F filing for Q3 2025, filed 13 Nov 2025.