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Granahan Investment Management’s iRhythm Holdings IRTC Stock Holding History

Granahan Investment Management’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 		$9.98M Sell
83,903
-12,119
-13% -$1.41M 0.36% 63
2026
Q1 		$11.3M Buy
96,022
+81,645
+568% +$11.8M 0.55% 50
2025
Q4 		$2.55M Sell
14,377
-563
-4% -$99.8K 0.11% 137
2025
Q3 		$2.57M Buy
14,940
+2,276
+18% +$362K 0.11% 122
2025
Q2 		$1.95M Sell
12,664
-2,108
-14% -$272K 0.08% 135
2025
Q1 		$1.55M Sell
14,772
-30,958
-68% -$3.28M 0.08% 141
2024
Q4 		$4.12M Sell
45,730
-26,698
-37% -$2.1M 0.17% 119
2024
Q3 		$5.38M Buy
+72,428
New +$5.77M 0.21% 122
2021
Q1 		– Sell
-12,274
Closed -$2.91M – 200
2020
Q4 		$2.91M Buy
+12,274
New +$2.8M 0.07% 158

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

Granahan Investment Management's IRTC Position: Q2 2026 in Review

Granahan Investment Management reduced its iRhythm Holdings (IRTC) stake by 13% in Q2 2026, selling an estimated $1.41M and leaving 83,903 shares worth $9.98M. The position accounts for 0.36% of the portfolio, ranked #63.

Granahan Investment Management first reported a position in IRTC in Q4 2020 and has held it in 9 quarters since. The position peaked at $11.3M in Q1 2026. 304 funds tracked by Wall St. Rank hold IRTC as of Q2 2026.

  • Granahan Investment Management held 83,903 shares of iRhythm Holdings worth $9.98M as of Q2 2026.
  • Granahan Investment Management sold 12,119 iRhythm Holdings shares in Q2 2026, an estimated $1.41M.
  • iRhythm Holdings made up 0.36% of Granahan Investment Management's portfolio in Q2 2026, its #63 holding.
  • Granahan Investment Management first reported a position in iRhythm Holdings in Q4 2020 and has held it in 9 quarters since.
  • Granahan Investment Management's iRhythm Holdings position peaked at $11.3M in Q1 2026.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q2 2026.

Based on Granahan Investment Management's 13F filing for Q2 2026, filed 14 Aug 2026.