XT
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XTX Topco’s Solid Biosciences SLDB Stock Holding History

XTX Topco’s Portfolio SLDB Stock Details SLDB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$889K Buy
89,034
+12,549
+16% +$95.1K 0.01% 1895
2026
Q1 		$551K Buy
76,485
+40,852
+115% +$262K 0.01% 1962
2025
Q4 		$201K Buy
+35,633
New +$193K 0.01% 2399
2025
Q2 		– Sell
-40,930
Closed -$151K – 3092
2025
Q1 		$151K Buy
+40,930
New +$175K 0.01% 1763
2024
Q4 		– Sell
-17,370
Closed -$121K – 2879
2024
Q3 		$121K Buy
+17,370
New +$141K 0.01% 1572
2022
Q2 		– Sell
-13,184
Closed -$237K – 1081
2022
Q1 		$237K Buy
13,184
+11,251
+582% +$199K 0.1% 357
2021
Q4 		$51K Buy
1,933
+1,006
+109% +$30.7K 0.03% 561
2021
Q3 		$33K Buy
927
+76
+9% +$3.23K 0.01% 625
2021
Q2 		$47K Buy
+851
New +$56.2K 0.02% 729

Other funds holding SLDB

RCM
RA Capital Management Boston, Massachusetts $11.5B AUM 168.77% 1-Year Est. Return
PA
Perceptive Advisors New York $6.66B AUM 360.84% 1-Year Est. Return
BCLSI
Bain Capital Life Sciences Investors Boston, Massachusetts $1.68B AUM 126.09% 1-Year Est. Return
SL
Siren LLC Greenwich, Connecticut $4.94B AUM 244.43% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
AC
Armistice Capital New York $8.17B AUM 68.82% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
JT
Jupiter Topco New York $245B AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

XTX Topco's SLDB Position: Q2 2026 in Review

XTX Topco increased its Solid Biosciences (SLDB) stake by 16% in Q2 2026, buying an estimated $95.1K and bringing the position to 89,034 shares worth $889K. The position accounts for 0.01% of the portfolio, ranked #1895.

XTX Topco first reported a position in SLDB in Q2 2021 and has held it in 9 quarters since. 156 funds tracked by Wall St. Rank hold SLDB as of Q2 2026.

  • XTX Topco held 89,034 shares of Solid Biosciences worth $889K as of Q2 2026.
  • XTX Topco bought 12,549 Solid Biosciences shares in Q2 2026, an estimated $95.1K.
  • Solid Biosciences made up 0.01% of XTX Topco's portfolio in Q2 2026, its #1895 holding.
  • XTX Topco first reported a position in Solid Biosciences in Q2 2021 and has held it in 9 quarters since.
  • 156 funds tracked by Wall St. Rank held Solid Biosciences as of Q2 2026.

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