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RTW Investments’s iRhythm Holdings IRTC Stock Holding History

RTW Investments’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 		$260M Buy
2,182,631
+514,131
+31% +$59.8M 2.22% 15
2026
Q1 		$197M Buy
1,668,500
+486,510
+41% +$70.2M 1.96% 16
2025
Q4 		$210M Buy
+1,181,990
New +$209M 2.1% 11

Other funds holding IRTC

BlackRock
BlackRock New York $6.73T AUM 46.02% 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
BNP Paribas Asset Management
BNP Paribas Asset Management Paris, France $99.8B AUM 45.22% 1-Year Est. Return

RTW Investments's IRTC Position: Q2 2026 in Review

RTW Investments increased its iRhythm Holdings (IRTC) stake by 31% in Q2 2026, buying an estimated $59.8M and bringing the position to 2,182,631 shares worth $260M. The position accounts for 2.22% of the portfolio, ranked #15.

RTW Investments first reported a position in IRTC in Q4 2025 and has held it in 3 quarters since. 304 funds tracked by Wall St. Rank hold IRTC as of Q2 2026.

  • RTW Investments held 2,182,631 shares of iRhythm Holdings worth $260M as of Q2 2026.
  • RTW Investments bought 514,131 iRhythm Holdings shares in Q2 2026, an estimated $59.8M.
  • iRhythm Holdings made up 2.22% of RTW Investments's portfolio in Q2 2026, its #15 holding.
  • RTW Investments first reported a position in iRhythm Holdings in Q4 2025 and has held it in 3 quarters since.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q2 2026.

Based on RTW Investments's 13F filing for Q2 2026, filed 14 Aug 2026.