GIM
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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
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 $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $41.5B AUM 42.97% 1-Year Est. Return
UBS AM
UBS AM Chicago, Illinois $481B AUM 26.39% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return