Arrowstreet Capital
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Arrowstreet Capital’s iRhythm Holdings IRTC Stock Holding History

Arrowstreet Capital’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 		$53.6M Sell
450,865
-132,014
-23% -$15.3M 0.02% 537
2026
Q1 		$68.8M Sell
582,879
-24,090
-4% -$3.48M 0.04% 404
2025
Q4 		$108M Buy
606,969
+65,930
+12% +$11.7M 0.06% 284
2025
Q3 		$93.1M Buy
541,039
+532,735
+6,415% +$84.7M 0.06% 299
2025
Q2 		$1.28M Buy
+8,304
New +$1.07M ﹤0.01% 1563

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

Arrowstreet Capital's IRTC Position: Q2 2026 in Review

Arrowstreet Capital reduced its iRhythm Holdings (IRTC) stake by 23% in Q2 2026, selling an estimated $15.3M and leaving 450,865 shares worth $53.6M. The position accounts for 0.02% of the portfolio, ranked #537.

Arrowstreet Capital first reported a position in IRTC in Q2 2025 and has held it in 5 quarters since. The position peaked at $108M in Q4 2025. 303 funds tracked by Wall St. Rank hold IRTC as of Q2 2026.

  • Arrowstreet Capital held 450,865 shares of iRhythm Holdings worth $53.6M as of Q2 2026.
  • Arrowstreet Capital sold 132,014 iRhythm Holdings shares in Q2 2026, an estimated $15.3M.
  • iRhythm Holdings made up 0.02% of Arrowstreet Capital's portfolio in Q2 2026, its #537 holding.
  • Arrowstreet Capital first reported a position in iRhythm Holdings in Q2 2025 and has held it in 5 quarters since.
  • Arrowstreet Capital's iRhythm Holdings position peaked at $108M in Q4 2025.
  • 303 funds tracked by Wall St. Rank held iRhythm Holdings as of Q2 2026.

Based on Arrowstreet Capital's 13F filing for Q2 2026, filed 13 Aug 2026.