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 		$24K Buy
+10,869
New +$28.4K ﹤0.01% 5892
2025
Q4 		– Sell
-16,879
Closed -$39.2K – 9099
2025
Q3 		$31.7K Buy
16,879
+8,640
+105% +$19K ﹤0.01% 6319
2025
Q2 		$23.9K Buy
+8,239
New +$11.9K ﹤0.01% 6148
2024
Q1 		– Sell
-4,590
Closed -$7.2K – 7917
2023
Q4 		$6.75K Sell
4,590
-29,600
-87% -$35.3K ﹤0.01% 6389
2023
Q3 		$41.4K Sell
34,190
-57,780
-63% -$80K ﹤0.01% 5279
2023
Q2 		$133K Buy
91,970
+4,866
+6% +$8.33K ﹤0.01% 4325
2023
Q1 		$126K Buy
87,104
+81,363
+1,417% +$136K ﹤0.01% 4087
2022
Q4 		$9.93K Sell
5,741
-49,359
-90% -$92.2K ﹤0.01% 6034
2022
Q3 		$110K Buy
55,100
+30,856
+127% +$30.7K ﹤0.01% 4689
2022
Q2 		$18K Buy
+24,244
New +$70.5K ﹤0.01% 6375
2020
Q4 		– Sell
-4,548
Closed -$70.9K – 6972
2020
Q3 		$51K Buy
4,548
+1,500
+49% +$17.7K ﹤0.01% 4630
2020
Q2 		$41K Buy
+3,048
New +$34.2K ﹤0.01% 4484
2019
Q4 		– Sell
-100
Closed -$1K – 5588
2019
Q3 		$1K Hold
100
– – ﹤0.01% 5007
2019
Q2 		$1K Hold
100
– – ﹤0.01% 4832
2019
Q1 		$1K Hold
100
– – ﹤0.01% 4672
2018
Q4 		$1K Buy
+100
New +$810 ﹤0.01% 4748

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.