Jim Simons’s Generation Bio GBIO Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q1 | – | Sell |
-287,614
| Closed | -$1.63M | – | 3408 |
|
|
2025
Q4 | $1.63M | Sell |
287,614
-56,649
| -16% | -$320K | ﹤0.01% | 1992 |
|
|
2025
Q3 | $2.11M | Buy |
344,263
+86,185
| +33% | +$446K | ﹤0.01% | 2041 |
|
|
2025
Q2 | $826K | Buy |
258,078
+70,011
| +37% | +$270K | ﹤0.01% | 2599 |
|
|
2025
Q1 | $762K | Buy |
188,067
+91,771
| +95% | +$645K | ﹤0.01% | 2561 |
|
|
2024
Q4 | $1.02M | Buy |
96,296
+36,866
| +62% | +$657K | ﹤0.01% | 2493 |
|
|
2024
Q3 | $1.47M | Sell |
59,430
-4,210
| -7% | -$111K | ﹤0.01% | 2221 |
|
|
2024
Q2 | $1.79M | Sell |
63,640
-2,810
| -4% | -$91.3K | ﹤0.01% | 1945 |
|
|
2024
Q1 | $2.71M | Sell |
66,450
-2,490
| -4% | -$58.6K | ﹤0.01% | 1825 |
|
|
2023
Q4 | $1.14M | Buy |
68,940
+37,460
| +119% | +$653K | ﹤0.01% | 2322 |
|
|
2023
Q3 | $1.19M | Buy |
31,480
+670
| +2% | +$31.7K | ﹤0.01% | 2183 |
|
|
2023
Q2 | $1.7M | Buy |
30,810
+2,110
| +7% | +$96.8K | ﹤0.01% | 2102 |
|
|
2023
Q1 | $1.23M | Buy |
28,700
+3,500
| +14% | +$169K | ﹤0.01% | 2335 |
|
|
2022
Q4 | $990K | Sell |
25,200
-3,820
| -13% | -$201K | ﹤0.01% | 2537 |
|
|
2022
Q3 | $1.54M | Buy |
29,020
+307
| +1% | +$19.2K | ﹤0.01% | 2211 |
|
|
2022
Q2 | $1.88M | Buy |
28,713
+21,463
| +296% | +$1.4M | ﹤0.01% | 2231 |
|
|
2022
Q1 | $532K | Sell |
7,250
-15,640
| -68% | -$906K | ﹤0.01% | 3150 |
|
|
2021
Q4 | $1.62M | Buy |
+22,890
| New | +$4M | ﹤0.01% | 2304 |
|
|
2021
Q3 | – | Sell |
-840
| Closed | -$226K | – | 3596 |
|
|
2021
Q2 | $226K | Buy |
+840
| New | +$251K | ﹤0.01% | 3223 |
|
Other funds holding GBIO
Jim Simons's GBIO Position: Q1 2026 in Review
Jim Simons sold out of Generation Bio (GBIO) in Q1 2026, closing a stake of 287,614 shares — an estimated $1.63M sold.
Jim Simons first reported a position in GBIO in Q2 2021 and held it in 18 quarters. The position peaked at $2.71M in Q1 2024. 2 funds tracked by Wall St. Rank hold GBIO as of Q1 2026.
- Jim Simons reported no remaining Generation Bio position as of Q1 2026 after selling out during the quarter.
- Jim Simons sold 287,614 Generation Bio shares in Q1 2026, an estimated $1.63M.
- Jim Simons first reported a position in Generation Bio in Q2 2021 and held it in 18 quarters.
- Jim Simons's Generation Bio position peaked at $2.71M in Q1 2024.
- 2 funds tracked by Wall St. Rank held Generation Bio as of Q1 2026.
Based on Renaissance Technologies's 13F filing for Q1 2026, filed 14 May 2026.