Fidelity Investments
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Fidelity Investments’s Rallybio RLYB Stock Holding History

Fidelity Investments’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 		$12.7M Buy
794,720
+1,269
+0.2% +$16.3K ﹤0.01% 2041
2026
Q1 		$7.12M Buy
793,451
+581,652
+275% +$3.98M ﹤0.01% 2174
2025
Q4 		$1.16M Hold
211,799
– – ﹤0.01% 2798
2025
Q3 		$846K Sell
211,799
-21,986
-9% -$92.4K ﹤0.01% 2849
2025
Q2 		$632K Buy
233,785
+10,633
+5% +$28.2K ﹤0.01% 2884
2025
Q1 		$1.17M Buy
223,152
+2,314
+1% +$14.6K ﹤0.01% 2629
2024
Q4 		$1.7M Sell
220,838
-68,597
-24% -$575K ﹤0.01% 2497
2024
Q3 		$2.71M Buy
289,435
+3,178
+1% +$30.6K ﹤0.01% 2309
2024
Q2 		$3.07M Buy
286,257
+1,305
+0.5% +$17.7K ﹤0.01% 2226
2024
Q1 		$4.22M Sell
284,952
-31,994
-10% -$446K ﹤0.01% 2123
2023
Q4 		$6.06M Sell
316,946
-88,840
-22% -$2.17M ﹤0.01% 2002
2023
Q3 		$10.9M Buy
405,786
+72
+0% +$3.12K ﹤0.01% 1800
2023
Q2 		$18.4M Buy
405,714
+57
+0% +$2.79K ﹤0.01% 1675
2023
Q1 		$18.5M Sell
405,657
-21
-0% -$1.08K ﹤0.01% 1636
2022
Q4 		$21.3M Buy
405,678
+43,947
+12% +$2.59M ﹤0.01% 1589
2022
Q3 		$41.9M Buy
361,731
+36
+0% +$3.21K ﹤0.01% 1314
2022
Q2 		$21.8M Sell
361,695
-120
-0% -$9.02K ﹤0.01% 1616
2022
Q1 		$20.2M Buy
361,815
+418
+0.1% +$34.6K ﹤0.01% 1773
2021
Q4 		$27.6M Hold
361,397
– – ﹤0.01% 1668
2021
Q3 		$50.8M Buy
+361,397
New +$42.4M ﹤0.01% 1403

Other funds holding RLYB

ACM
ADAR1 Capital Management Austin, Texas $2.19B AUM 374.99% 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
Citadel Advisors
Citadel Advisors Miami, Florida $875B AUM 40.89% 1-Year Est. Return

Fidelity Investments's RLYB Position: Q2 2026 in Review

Fidelity Investments increased its Rallybio (RLYB) stake by 0.16% in Q2 2026, buying an estimated $16.3K and bringing the position to 794,720 shares worth $12.7M. The position accounts for ﹤0.01% of the portfolio, ranked #2041.

Fidelity Investments first reported a position in RLYB in Q3 2021 and has held it in 20 quarters since. The position peaked at $50.8M in Q3 2021. 37 funds tracked by Wall St. Rank hold RLYB as of Q2 2026.

  • Fidelity Investments held 794,720 shares of Rallybio worth $12.7M as of Q2 2026.
  • Fidelity Investments bought 1,269 Rallybio shares in Q2 2026, an estimated $16.3K.
  • Rallybio made up ﹤0.01% of Fidelity Investments's portfolio in Q2 2026, its #2041 holding.
  • Fidelity Investments first reported a position in Rallybio in Q3 2021 and has held it in 20 quarters since.
  • Fidelity Investments's Rallybio position peaked at $50.8M in Q3 2021.
  • 37 funds tracked by Wall St. Rank held Rallybio as of Q2 2026.

Based on Fidelity Investments's 13F filing for Q2 2026, filed 13 Aug 2026.