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
Q2 		$3.2M Buy
199,907
+43,380
+28% +$558K ﹤0.01% 1702
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

ADAR1 Capital Management
ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Viking Global Investors
Viking Global Investors Stamford, Connecticut $35.1B AUM 21.36% 1-Year Est. Return
TPG GP A
TPG GP A Fort Worth, Texas $5B AUM 58.56% 1-Year Est. Return
Pivotal bioVenture Partners Investment Advisor
Pivotal bioVenture Partners Investment Advisor San Francisco, California $308M AUM 120.89% 1-Year Est. Return
Nantahala Capital Management
Nantahala Capital Management New Canaan, Connecticut $3.01B AUM 119.46% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Almitas Capital
Almitas Capital Santa Monica, California $417M AUM 22.81% 1-Year Est. Return
Rangeley Capital
Rangeley Capital New Canaan, Connecticut $109M AUM 97.13% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return

Jim Simons's RLYB Position: Q2 2026 in Review

Jim Simons increased its Rallybio (RLYB) stake by 28% in Q2 2026, buying an estimated $558K and bringing the position to 199,907 shares worth $3.2M. The position accounts for ﹤0.01% of the portfolio, ranked #1702.

Jim Simons first reported a position in RLYB in Q1 2022 and has held it in 12 quarters since. 37 funds tracked by Wall St. Rank hold RLYB as of Q2 2026.

  • Jim Simons held 199,907 shares of Rallybio worth $3.2M as of Q2 2026.
  • Jim Simons bought 43,380 Rallybio shares in Q2 2026, an estimated $558K.
  • Rallybio made up ﹤0.01% of Jim Simons's portfolio in Q2 2026, its #1702 holding.
  • Jim Simons first reported a position in Rallybio in Q1 2022 and has held it in 12 quarters since.
  • 37 funds tracked by Wall St. Rank held Rallybio as of Q2 2026.

Based on Renaissance Technologies's 13F filing for Q2 2026, filed 13 Aug 2026.