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XTX Topco’s Rallybio RLYB Stock Holding History

XTX Topco’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 		$344K Buy
21,497
+10,271
+91% +$132K ﹤0.01% 2788
2026
Q1 		$101K Sell
11,226
-938
-8% -$6.41K ﹤0.01% 3101
2025
Q4 		$66.8K Buy
12,164
+4,775
+65% +$24.6K ﹤0.01% 2758
2025
Q3 		$29.5K Buy
7,389
+454
+7% +$1.91K ﹤0.01% 2264
2025
Q2 		$18.8K Buy
+6,935
New +$18.4K ﹤0.01% 2173
2025
Q1 		– Sell
-1,852
Closed -$14.2K – 2993
2024
Q4 		$14.2K Buy
1,852
+21
+1% +$176 ﹤0.01% 2098
2024
Q3 		$17.1K Buy
+1,831
New +$17.6K ﹤0.01% 1865
2024
Q2 		– Sell
-2,849
Closed -$42.2K – 2381
2024
Q1 		$42.2K Buy
+2,849
New +$39.7K 0.01% 1499

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

XTX Topco's RLYB Position: Q2 2026 in Review

XTX Topco increased its Rallybio (RLYB) stake by 91% in Q2 2026, buying an estimated $132K and bringing the position to 21,497 shares worth $344K. The position accounts for ﹤0.01% of the portfolio, ranked #2788.

XTX Topco first reported a position in RLYB in Q1 2024 and has held it in 8 quarters since. 37 funds tracked by Wall St. Rank hold RLYB as of Q2 2026.

  • XTX Topco held 21,497 shares of Rallybio worth $344K as of Q2 2026.
  • XTX Topco bought 10,271 Rallybio shares in Q2 2026, an estimated $132K.
  • Rallybio made up ﹤0.01% of XTX Topco's portfolio in Q2 2026, its #2788 holding.
  • XTX Topco first reported a position in Rallybio in Q1 2024 and has held it in 8 quarters since.
  • 37 funds tracked by Wall St. Rank held Rallybio as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.