BlackRock
RLYB icon

BlackRock’s Rallybio RLYB Stock Holding History

BlackRock’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 		$485K Buy
30,332
+12,846
+73% +$165K ﹤0.01% 4583
2026
Q1 		$157K Sell
17,486
-222
-1% -$1.52K ﹤0.01% 4847
2025
Q4 		$97.2K Hold
17,708
– – ﹤0.01% 4911
2025
Q3 		$70.7K Sell
17,708
-1,623
-8% -$6.82K ﹤0.01% 4916
2025
Q2 		$52.3K Sell
19,331
-6,846
-26% -$18.1K ﹤0.01% 4981
2025
Q1 		$137K Buy
26,177
+1,025
+4% +$6.48K ﹤0.01% 4685
2024
Q4 		$193K Buy
25,152
+46
+0.2% +$385 ﹤0.01% 4626
2024
Q3 		$235K Sell
25,106
-14,347
-36% -$138K ﹤0.01% 4494
2024
Q2 		$423K Sell
39,453
-170,043
-81% -$2.3M ﹤0.01% 4385
2024
Q1 		$3.1M Sell
209,496
-9,953
-5% -$139K ﹤0.01% 3851
2023
Q4 		$4.2M Buy
219,449
+15,538
+8% +$380K ﹤0.01% 3752
2023
Q3 		$5.5M Sell
203,911
-2,821
-1% -$122K ﹤0.01% 3619
2023
Q2 		$9.36M Buy
206,732
+90,295
+78% +$4.42M ﹤0.01% 3446
2023
Q1 		$5.32M Sell
116,437
-2,151
-2% -$111K ﹤0.01% 3611
2022
Q4 		$6.23M Sell
118,588
-4,584
-4% -$271K ﹤0.01% 3626
2022
Q3 		$14.3M Buy
123,172
+6,991
+6% +$623K ﹤0.01% 3229
2022
Q2 		$7.02M Buy
116,181
+2,660
+2% +$200K ﹤0.01% 3671
2022
Q1 		$6.34M Buy
113,521
+53,332
+89% +$4.41M ﹤0.01% 3827
2021
Q4 		$4.59M Buy
60,189
+23,663
+65% +$2.75M ﹤0.01% 4027
2021
Q3 		$5.14M Buy
+36,526
New +$4.28M ﹤0.01% 3948

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

BlackRock's RLYB Position: Q2 2026 in Review

BlackRock increased its Rallybio (RLYB) stake by 73% in Q2 2026, buying an estimated $165K and bringing the position to 30,332 shares worth $485K. The position accounts for ﹤0.01% of the portfolio, ranked #4583.

BlackRock first reported a position in RLYB in Q3 2021 and has held it in 20 quarters since. The position peaked at $14.3M in Q3 2022. 37 funds tracked by Wall St. Rank hold RLYB as of Q2 2026.

  • BlackRock held 30,332 shares of Rallybio worth $485K as of Q2 2026.
  • BlackRock bought 12,846 Rallybio shares in Q2 2026, an estimated $165K.
  • Rallybio made up ﹤0.01% of BlackRock's portfolio in Q2 2026, its #4583 holding.
  • BlackRock first reported a position in Rallybio in Q3 2021 and has held it in 20 quarters since.
  • BlackRock's Rallybio position peaked at $14.3M in Q3 2022.
  • 37 funds tracked by Wall St. Rank held Rallybio as of Q2 2026.

Based on BlackRock's 13F filing for Q2 2026, filed 7 Aug 2026.