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XTX Topco’s iRhythm Holdings IRTC Stock Holding History

XTX Topco’s Portfolio IRTC Stock Details IRTC Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$2.69M Buy
22,619
+3,085
+16% +$359K 0.03% 830
2026
Q1 		$2.31M Buy
19,534
+14,718
+306% +$2.12M 0.04% 721
2025
Q4 		$855K Buy
+4,816
New +$853K 0.02% 1140
2025
Q3 		– Sell
-16,504
Closed -$2.54M – 2891
2025
Q2 		$2.54M Buy
16,504
+14,042
+570% +$1.81M 0.11% 242
2025
Q1 		$258K Buy
+2,462
New +$261K 0.01% 1519
2024
Q2 		– Sell
-7,050
Closed -$818K – 2147
2024
Q1 		$818K Buy
7,050
+3,033
+76% +$341K 0.11% 232
2023
Q4 		$430K Sell
4,017
-5,674
-59% -$494K 0.09% 349
2023
Q3 		$913K Buy
9,691
+5,025
+108% +$511K 0.16% 122
2023
Q2 		$487K Buy
+4,666
New +$560K 0.09% 385
2021
Q2 		– Sell
-1,949
Closed -$271K – 945
2021
Q1 		$271K Buy
+1,949
New +$349K 0.13% 325

Other funds holding IRTC

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
RI
RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $63.1B AUM 35.51% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
UBS AM
UBS AM Chicago, Illinois $550B AUM 43.33% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
EAM
Eventide Asset Management Boston, Massachusetts $7.48B AUM 104.76% 1-Year Est. Return

XTX Topco's IRTC Position: Q2 2026 in Review

XTX Topco increased its iRhythm Holdings (IRTC) stake by 16% in Q2 2026, buying an estimated $359K and bringing the position to 22,619 shares worth $2.69M. The position accounts for 0.03% of the portfolio, ranked #830.

XTX Topco first reported a position in IRTC in Q1 2021 and has held it in 10 quarters since. 304 funds tracked by Wall St. Rank hold IRTC as of Q2 2026.

  • XTX Topco held 22,619 shares of iRhythm Holdings worth $2.69M as of Q2 2026.
  • XTX Topco bought 3,085 iRhythm Holdings shares in Q2 2026, an estimated $359K.
  • iRhythm Holdings made up 0.03% of XTX Topco's portfolio in Q2 2026, its #830 holding.
  • XTX Topco first reported a position in iRhythm Holdings in Q1 2021 and has held it in 10 quarters since.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q2 2026.

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