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
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 $9.44B AUM 68.42% 1-Year Est. Return
EC
EcoR1 Capital San Francisco, California $2.36B AUM 204.53% 1-Year Est. Return
6CM
683 Capital Management New York $1.92B AUM 85.52% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
DCM
Defilade Capital Management Emeryville, California $712M AUM
NM
Newtyn Management New York $936M AUM 27.23% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
TC
Tejara Capital London, United Kingdom $303M AUM 5.43% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
WANY
Wealthspire Advisors (New York) New York $12.7B AUM 17.31% 1-Year Est. Return

BlackRock's MREO Position: Q1 2026 in Review

BlackRock reduced its Mereo BioPharma (MREO) stake by 3.1% in Q1 2026, selling an estimated $4.13K and leaving 302,991 shares worth $100K. The position accounts for ﹤0.01% of the portfolio, ranked #4960.

BlackRock first reported a position in MREO in Q1 2021 and has held it in 17 quarters since. The position peaked at $1.23M in Q2 2025. 63 funds tracked by Wall St. Rank hold MREO as of Q1 2026.

  • BlackRock held 302,991 shares of Mereo BioPharma worth $100K as of Q1 2026.
  • BlackRock sold 9,622 Mereo BioPharma shares in Q1 2026, an estimated $4.13K.
  • Mereo BioPharma made up ﹤0.01% of BlackRock's portfolio in Q1 2026, its #4960 holding.
  • BlackRock first reported a position in Mereo BioPharma in Q1 2021 and has held it in 17 quarters since.
  • BlackRock's Mereo BioPharma position peaked at $1.23M in Q2 2025.
  • 63 funds tracked by Wall St. Rank held Mereo BioPharma as of Q1 2026.

Based on BlackRock's 13F filing for Q1 2026, filed 13 May 2026.