Jane Street
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Jane Street’s Rallybio RLYB Stock Holding History

Jane Street’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 		$759K Buy
+47,423
New +$610K ﹤0.01% 7125
2025
Q3 		– Sell
-1,468
Closed -$3.97K – 11612
2025
Q2 		$3.97K Buy
1,468
+140
+11% +$371 ﹤0.01% 9447
2025
Q1 		$6.95K Buy
+1,328
New +$8.39K ﹤0.01% 9221
2024
Q4 		– Sell
-2,784
Closed -$26.1K – 10382
2024
Q3 		$26.1K Sell
2,784
-3,851
-58% -$37.1K ﹤0.01% 9267
2024
Q2 		$71.1K Buy
+6,635
New +$89.9K ﹤0.01% 8841
2024
Q1 		– Sell
-3,090
Closed -$59.1K – 9946
2023
Q4 		$59.1K Buy
+3,090
New +$75.5K ﹤0.01% 8744

Other funds holding RLYB

ACM
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
TGA
TPG GP A Fort Worth, Texas $5B AUM 58.56% 1-Year Est. Return
PBPIA
Pivotal bioVenture Partners Investment Advisor San Francisco, California $308M AUM 120.89% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return
NCM
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
AC
Almitas Capital Santa Monica, California $417M AUM 22.81% 1-Year Est. Return
RC
Rangeley Capital New Canaan, Connecticut $109M AUM 97.13% 1-Year Est. Return

Jane Street's RLYB Position: Q2 2026 in Review

Jane Street opened a new position in Rallybio (RLYB) in Q2 2026: 47,423 shares worth $759K. The stake represents ﹤0.01% of the portfolio and ranks #7125 among its holdings. This is a return to the name: Jane Street previously reported a position in RLYB as recently as Q2 2025.

Jane Street first reported a position in RLYB in Q4 2023 and has held it in 6 quarters since. 37 funds tracked by Wall St. Rank hold RLYB as of Q2 2026.

  • Jane Street held 47,423 shares of Rallybio worth $759K as of Q2 2026.
  • Rallybio was a new Jane Street position in Q2 2026.
  • Rallybio made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #7125 holding.
  • Jane Street first reported a position in Rallybio in Q4 2023 and has held it in 6 quarters since.
  • 37 funds tracked by Wall St. Rank held Rallybio as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.