XTX Topco’s Mereo BioPharma MREO Stock Holding History

XTX Topco’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	$55.4K	Buy	174,481 +90,012	+107%	+$27K	﹤0.01%	3693
2026 Q1	$27.9K	Buy	+84,469	New	+$36.2K	﹤0.01%	3473
2025 Q4	–	Sell	-191,037	Closed	-$394K	–	3619
2025 Q3	$394K	Buy	191,037 +121,696	+176%	+$224K	0.02%	1276
2025 Q2	$188K	Buy	+69,341	New	+$167K	0.01%	1728
2025 Q1	–	Sell	-37,974	Closed	-$133K	–	2824
2024 Q4	$133K	Buy	+37,974	New	+$149K	0.01%	1706
2023 Q4	–	Sell	-11,313	Closed	-$14.6K	–	1911
2023 Q3	$14.6K	Buy	+11,313	New	+$15K	﹤0.01%	1397

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 Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

DCM

Defilade Capital Management Emeryville, California $747M AUM

Newtyn Management New York $801M AUM 23.14% 1-Year Est. Return

Tejara Capital London, United Kingdom $243M AUM 9.84% 1-Year Est. Return

UBS Group Zurich, Switzerland $786B AUM 40.34% 1-Year Est. Return

Two Sigma Investments New York $138B AUM 41.87% 1-Year Est. Return

EcoR1 Capital San Francisco, California $2.06B AUM 215.32% 1-Year Est. Return

Jane Street New York $1.21T AUM 78.12% 1-Year Est. Return

XTX Topco's MREO Position: Q2 2026 in Review

XTX Topco increased its Mereo BioPharma (MREO) stake by 107% in Q2 2026, buying an estimated $27K and bringing the position to 174,481 shares worth $55.4K. The position accounts for ﹤0.01% of the portfolio, ranked #3693.

XTX Topco first reported a position in MREO in Q3 2023 and has held it in 6 quarters since. The position peaked at $394K in Q3 2025. 60 funds tracked by Wall St. Rank hold MREO as of Q2 2026.

XTX Topco held 174,481 shares of Mereo BioPharma worth $55.4K as of Q2 2026.
XTX Topco bought 90,012 Mereo BioPharma shares in Q2 2026, an estimated $27K.
Mereo BioPharma made up ﹤0.01% of XTX Topco's portfolio in Q2 2026, its #3693 holding.
XTX Topco first reported a position in Mereo BioPharma in Q3 2023 and has held it in 6 quarters since.
XTX Topco's Mereo BioPharma position peaked at $394K in Q3 2025.
60 funds tracked by Wall St. Rank held Mereo BioPharma as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.