XT
RMBS icon

XTX Topco’s Rambus RMBS Stock Holding History

XTX Topco’s Portfolio RMBS Stock Details RMBS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$1.47M Sell
11,101
-10,101
-48% -$1.31M 0.02% 1426
2026
Q1 		$1.82M Buy
+21,202
New +$2.12M 0.03% 906
2025
Q4 		– Sell
-6,221
Closed -$648K – 3714
2025
Q3 		$648K Buy
6,221
+1,750
+39% +$135K 0.03% 880
2025
Q2 		$286K Sell
4,471
-31,104
-87% -$1.67M 0.01% 1469
2025
Q1 		$1.84M Buy
+35,575
New +$2.09M 0.09% 283
2024
Q4 		– Sell
-17,656
Closed -$745K – 2834
2024
Q3 		$745K Buy
+17,656
New +$856K 0.05% 564
2024
Q1 		– Sell
-7,504
Closed -$512K – 2243
2023
Q4 		$512K Buy
+7,504
New +$467K 0.11% 241

Other funds holding RMBS

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
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

XTX Topco's RMBS Position: Q2 2026 in Review

XTX Topco reduced its Rambus (RMBS) stake by 48% in Q2 2026, selling an estimated $1.31M and leaving 11,101 shares worth $1.47M. The position accounts for 0.02% of the portfolio, ranked #1426.

XTX Topco first reported a position in RMBS in Q4 2023 and has held it in 7 quarters since. The position peaked at $1.84M in Q1 2025. 617 funds tracked by Wall St. Rank hold RMBS as of Q2 2026.

  • XTX Topco held 11,101 shares of Rambus worth $1.47M as of Q2 2026.
  • XTX Topco sold 10,101 Rambus shares in Q2 2026, an estimated $1.31M.
  • Rambus made up 0.02% of XTX Topco's portfolio in Q2 2026, its #1426 holding.
  • XTX Topco first reported a position in Rambus in Q4 2023 and has held it in 7 quarters since.
  • XTX Topco's Rambus position peaked at $1.84M in Q1 2025.
  • 617 funds tracked by Wall St. Rank held Rambus as of Q2 2026.

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