Group One Trading
MREO

Group One Trading’s Mereo BioPharma MREO Stock Holding History

Group One Trading’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 		$121K Sell
365,300
-208,700
-36% -$89.6K ﹤0.01% 4568
2025
Q4 		$239K Buy
574,000
+566,200
+7,259% +$1.08M ﹤0.01% 4217
2025
Q3 		$16.1K Sell
7,800
-48,300
-86% -$89K ﹤0.01% 6860
2025
Q2 		$152K Sell
56,100
-28,000
-33% -$67.6K ﹤0.01% 4602
2025
Q1 		$189K Buy
84,100
+47,800
+132% +$135K ﹤0.01% 4068
2024
Q4 		$127K Buy
36,300
+200
+0.6% +$786 ﹤0.01% 4318
2024
Q3 		$148K Sell
36,100
-6,500
-15% -$26.9K ﹤0.01% 3871
2024
Q2 		$153K Buy
42,600
+18,200
+75% +$59K ﹤0.01% 3622
2024
Q1 		$80.5K Buy
24,400
+17,400
+249% +$58.9K ﹤0.01% 4332
2023
Q4 		$16.2K Buy
+7,000
New +$13.4K ﹤0.01% 5907
2023
Q1 		– Sell
-27,400
Closed -$20.6K – 7665
2022
Q4 		$20.6K Hold
27,400
– – ﹤0.01% 5585
2022
Q3 		$24K Buy
27,400
+9,500
+53% +$11.6K ﹤0.01% 5946
2022
Q2 		$20K Buy
+17,900
New +$13.9K ﹤0.01% 6286
2022
Q1 		– Sell
-1,800
Closed -$3K – 8436
2021
Q4 		$3K Buy
1,800
+1,300
+260% +$2.6K ﹤0.01% 7793
2021
Q3 		$1K Sell
500
-10,700
-96% -$28.3K ﹤0.01% 8025
2021
Q2 		$36K Sell
11,200
-2,900
-21% -$9.73K ﹤0.01% 6833
2021
Q1 		$48K Buy
+14,100
New +$49.8K ﹤0.01% 6250

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

Group One Trading's MREO Position: Q1 2026 in Review

Group One Trading reduced its Mereo BioPharma (MREO) stake by 24% in Q1 2026, selling an estimated $45.4K and leaving 335,827 shares worth $111K. The position accounts for ﹤0.01% of the portfolio, ranked #4635.

Group One Trading first reported a position in MREO in Q2 2021 and has held it in 13 quarters since. The position peaked at $378K in Q2 2025. 63 funds tracked by Wall St. Rank hold MREO as of Q1 2026.

  • Group One Trading held 335,827 shares of Mereo BioPharma worth $111K as of Q1 2026.
  • Group One Trading sold 105,809 Mereo BioPharma shares in Q1 2026, an estimated $45.4K.
  • Mereo BioPharma made up ﹤0.01% of Group One Trading's portfolio in Q1 2026, its #4635 holding.
  • Group One Trading first reported a position in Mereo BioPharma in Q2 2021 and has held it in 13 quarters since.
  • Group One Trading's Mereo BioPharma position peaked at $378K in Q2 2025.
  • 63 funds tracked by Wall St. Rank held Mereo BioPharma as of Q1 2026.

Based on Group One Trading's 13F filing for Q1 2026, filed 13 May 2026.