Group One Trading
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Group One Trading’s Spero Therapeutics SPRO Stock Holding History

Group One Trading’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
2026
Q2 		$49.5K Buy
22,400
+15,400
+220% +$40.3K ﹤0.01% 5411
2026
Q1 		$16.4K Buy
7,000
+5,900
+536% +$14K ﹤0.01% 6087
2025
Q4 		$2.56K Sell
1,100
-94,200
-99% -$219K ﹤0.01% 7461
2025
Q3 		$179K Sell
95,300
-26,800
-22% -$58.9K ﹤0.01% 4779
2025
Q2 		$354K Buy
+122,100
New +$176K ﹤0.01% 3759
2024
Q1 		– Sell
-20,000
Closed -$29.4K – 7918
2023
Q4 		$29.4K Sell
20,000
-40,000
-67% -$47.7K ﹤0.01% 5462
2023
Q3 		$72.6K Sell
60,000
-60,000
-50% -$83.1K ﹤0.01% 4756
2023
Q2 		$174K Buy
120,000
+20,000
+20% +$34.2K ﹤0.01% 4087
2023
Q1 		$145K Buy
100,000
+18,600
+23% +$31.1K ﹤0.01% 3966
2022
Q4 		$141K Sell
81,400
-44,100
-35% -$82.3K ﹤0.01% 4147
2022
Q3 		$251K Buy
+125,500
New +$125K ﹤0.01% 3925
2022
Q2 		– Sell
-1,700
Closed -$15K – 8486
2022
Q1 		$15K Sell
1,700
-300
-15% -$3.07K ﹤0.01% 6960
2021
Q4 		$32K Buy
2,000
+600
+43% +$9.53K ﹤0.01% 6683
2021
Q3 		$26K Buy
+1,400
New +$22.5K ﹤0.01% 7020
2021
Q2 		– Sell
-8,500
Closed -$125K – 8552
2021
Q1 		$125K Buy
8,500
+8,000
+1,600% +$141K ﹤0.01% 5452
2020
Q4 		$10K Buy
+500
New +$7.79K ﹤0.01% 5795
2019
Q4 		– Sell
-100
Closed -$1K – 5589
2019
Q3 		$1K Hold
100
– – ﹤0.01% 5008
2019
Q2 		$1K Hold
100
– – ﹤0.01% 4833
2019
Q1 		$1K Buy
+100
New +$1.06K ﹤0.01% 4673

Other funds holding SPRO

GP
GSK plc London $602M AUM
P
Pfizer New York $170M AUM 191.09% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
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
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Raymond James Financial
Raymond James Financial St Petersburg, Florida $369B AUM 28.27% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

Group One Trading's SPRO Position: Q2 2026 in Review

Group One Trading opened a new position in Spero Therapeutics (SPRO) in Q2 2026: 10,869 shares worth $24K. The stake represents ﹤0.01% of the portfolio and ranks #5892 among its holdings. This is a return to the name: Group One Trading previously reported a position in SPRO as recently as Q3 2025.

Group One Trading first reported a position in SPRO in Q4 2018 and has held it in 16 quarters since. The position peaked at $133K in Q2 2023. 60 funds tracked by Wall St. Rank hold SPRO as of Q2 2026.

  • Group One Trading held 10,869 shares of Spero Therapeutics worth $24K as of Q2 2026.
  • Spero Therapeutics was a new Group One Trading position in Q2 2026.
  • Spero Therapeutics made up ﹤0.01% of Group One Trading's portfolio in Q2 2026, its #5892 holding.
  • Group One Trading first reported a position in Spero Therapeutics in Q4 2018 and has held it in 16 quarters since.
  • Group One Trading's Spero Therapeutics position peaked at $133K in Q2 2023.
  • 60 funds tracked by Wall St. Rank held Spero Therapeutics as of Q2 2026.

Based on Group One Trading's 13F filing for Q2 2026, filed 14 Aug 2026.