Jim Simons
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Jim Simons’s Rallybio RLYB Stock Holding History

Jim Simons’s Portfolio RLYB Stock Details RLYB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$1.4M Buy
156,527
+52,065
+50% +$356K ﹤0.01% 2090
2025
Q4 		$573K Buy
104,462
+15,112
+17% +$77.8K ﹤0.01% 2522
2025
Q3 		$357K Buy
89,350
+28,721
+47% +$121K ﹤0.01% 2935
2025
Q2 		$164K Buy
60,629
+11,066
+22% +$29.3K ﹤0.01% 3204
2025
Q1 		$260K Sell
49,563
-5,602
-10% -$35.4K ﹤0.01% 2981
2024
Q4 		$424K Buy
55,165
+4,702
+9% +$39.4K ﹤0.01% 2917
2024
Q3 		$472K Buy
50,463
+7,875
+18% +$75.9K ﹤0.01% 2818
2024
Q2 		$457K Sell
42,588
-18,425
-30% -$250K ﹤0.01% 2735
2024
Q1 		$903K Buy
+61,013
New +$850K ﹤0.01% 2545
2023
Q1 		– Sell
-1,725
Closed -$91K – 4320
2022
Q4 		$91K Buy
+1,725
New +$102K ﹤0.01% 3651
2022
Q2 		– Sell
-6,589
Closed -$368K – 4516
2022
Q1 		$368K Buy
+6,589
New +$545K ﹤0.01% 3370

Other funds holding RLYB

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return
CAM
Cormorant Asset Management Boston, Massachusetts $1.99B AUM 737.95% 1-Year Est. Return
TGA
TPG GP A Fort Worth, Texas $3.68B AUM 14.99% 1-Year Est. Return
Balyasny Asset Management
Balyasny Asset Management Chicago, Illinois $77.1B AUM 42.89% 1-Year Est. Return
LCM
Laurion Capital Management New York $2.29B AUM 75.73% 1-Year Est. Return
NCM
Nantahala Capital Management New Canaan, Connecticut $2.72B AUM 121.58% 1-Year Est. Return
PBPIA
Pivotal bioVenture Partners Investment Advisor San Francisco, California $280M AUM 181.4% 1-Year Est. Return
5VM
5AM Venture Management San Francisco, California $360M AUM 345.76% 1-Year Est. Return
AC
Almitas Capital Santa Monica, California $443M AUM 42.36% 1-Year Est. Return

Jim Simons's RLYB Position: Q1 2026 in Review

Jim Simons increased its Rallybio (RLYB) stake by 50% in Q1 2026, buying an estimated $356K and bringing the position to 156,527 shares worth $1.4M. The position accounts for ﹤0.01% of the portfolio, ranked #2090.

Jim Simons first reported a position in RLYB in Q1 2022 and has held it in 11 quarters since. 38 funds tracked by Wall St. Rank hold RLYB as of Q1 2026.

  • Jim Simons held 156,527 shares of Rallybio worth $1.4M as of Q1 2026.
  • Jim Simons bought 52,065 Rallybio shares in Q1 2026, an estimated $356K.
  • Rallybio made up ﹤0.01% of Jim Simons's portfolio in Q1 2026, its #2090 holding.
  • Jim Simons first reported a position in Rallybio in Q1 2022 and has held it in 11 quarters since.
  • 38 funds tracked by Wall St. Rank held Rallybio as of Q1 2026.

Based on Renaissance Technologies's 13F filing for Q1 2026, filed 14 May 2026.