BlackRock
MREO

BlackRock’s Mereo BioPharma MREO Stock Holding History

BlackRock’s Portfolio MREO Stock Details MREO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$22.1K Sell
69,678
-233,313
-77% -$70K ﹤0.01% 5346
2026
Q1 		$100K Sell
302,991
-9,622
-3% -$4.13K ﹤0.01% 4960
2025
Q4 		$130K Sell
312,613
-131,391
-30% -$250K ﹤0.01% 4834
2025
Q3 		$915K Sell
444,004
-11,361
-2% -$20.9K ﹤0.01% 4305
2025
Q2 		$1.23M Buy
455,365
+181,004
+66% +$437K ﹤0.01% 4191
2025
Q1 		$617K Buy
274,361
+1,342
+0.5% +$3.8K ﹤0.01% 4339
2024
Q4 		$956K Buy
273,019
+258,698
+1,806% +$1.02M ﹤0.01% 4233
2024
Q3 		$58.9K Sell
14,321
-2,471
-15% -$10.2K ﹤0.01% 4781
2024
Q2 		$60.5K Sell
16,792
-16,051
-49% -$52K ﹤0.01% 4820
2024
Q1 		$108K Buy
32,843
+26,911
+454% +$91.1K ﹤0.01% 4709
2023
Q4 		$13.7K Buy
+5,932
New +$11.3K ﹤0.01% 5123
2022
Q4 		– Sell
-657,182
Closed -$565K – 5819
2022
Q3 		$565K Sell
657,182
-18,850
-3% -$23.1K ﹤0.01% 4688
2022
Q2 		$757K Sell
676,032
-73,569
-10% -$57K ﹤0.01% 4646
2022
Q1 		$840K Buy
749,601
+278,729
+59% +$360K ﹤0.01% 4721
2021
Q4 		$753K Buy
470,872
+456,572
+3,193% +$913K ﹤0.01% 4753
2021
Q3 		$35K Buy
14,300
+1,341
+10% +$3.55K ﹤0.01% 5333
2021
Q2 		$41K Buy
12,959
+12,794
+7,754% +$42.9K ﹤0.01% 5213
2021
Q1 		$1K Buy
+165
New +$583 ﹤0.01% 5250

Other funds holding MREO

RCMNY
Rubric Capital Management (New York) New York $10.9B AUM 70.31% 1-Year Est. Return
6CM
683 Capital Management New York $2.04B AUM 94.26% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return
DCM
Defilade Capital Management Emeryville, California $747M AUM
NM
Newtyn Management New York $801M AUM 23.14% 1-Year Est. Return
TC
Tejara Capital London, United Kingdom $243M AUM 9.84% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return
Two Sigma Investments
Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return
EC
EcoR1 Capital San Francisco, California $2.06B AUM 215.32% 1-Year Est. Return
Jane Street
Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return

BlackRock's MREO Position: Q2 2026 in Review

BlackRock reduced its Mereo BioPharma (MREO) stake by 77% in Q2 2026, selling an estimated $70K and leaving 69,678 shares worth $22.1K. The position accounts for ﹤0.01% of the portfolio, ranked #5346.

BlackRock first reported a position in MREO in Q1 2021 and has held it in 18 quarters since. The position peaked at $1.23M in Q2 2025. 61 funds tracked by Wall St. Rank hold MREO as of Q2 2026.

  • BlackRock held 69,678 shares of Mereo BioPharma worth $22.1K as of Q2 2026.
  • BlackRock sold 233,313 Mereo BioPharma shares in Q2 2026, an estimated $70K.
  • Mereo BioPharma made up ﹤0.01% of BlackRock's portfolio in Q2 2026, its #5346 holding.
  • BlackRock first reported a position in Mereo BioPharma in Q1 2021 and has held it in 18 quarters since.
  • BlackRock's Mereo BioPharma position peaked at $1.23M in Q2 2025.
  • 61 funds tracked by Wall St. Rank held Mereo BioPharma as of Q2 2026.

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