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Cookson Peirce & Co’s iRhythm Holdings IRTC Stock Holding History

Cookson Peirce & Co’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 		– Sell
-19,549
Closed -$3.47M – 334
2025
Q4 		$3.47M Buy
19,549
+5,025
+35% +$890K 0.14% 92
2025
Q3 		$2.5M Buy
14,524
+7,452
+105% +$1.18M 0.1% 96
2025
Q2 		$1.09M Buy
+7,072
New +$914K 0.05% 151
2022
Q3 		– Sell
-10,780
Closed -$1.17M – 203
2022
Q2 		$1.17M Buy
+10,780
New +$1.43M 0.08% 98

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
RI
RTW Investments New York $11.7B AUM 174.13% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
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
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $44.4B AUM 57.89% 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

Cookson Peirce & Co's IRTC Position: Q1 2026 in Review

Cookson Peirce & Co sold out of iRhythm Holdings (IRTC) in Q1 2026, closing a stake of 19,549 shares — an estimated $3.47M sold.

Cookson Peirce & Co first reported a position in IRTC in Q2 2022 and held it in 4 quarters. The position peaked at $3.47M in Q4 2025. 305 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Cookson Peirce & Co reported no remaining iRhythm Holdings position as of Q1 2026 after selling out during the quarter.
  • Cookson Peirce & Co sold 19,549 iRhythm Holdings shares in Q1 2026, an estimated $3.47M.
  • Cookson Peirce & Co first reported a position in iRhythm Holdings in Q2 2022 and held it in 4 quarters.
  • Cookson Peirce & Co's iRhythm Holdings position peaked at $3.47M in Q4 2025.
  • 305 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Cookson Peirce & Co's 13F filing for Q1 2026, filed 30 Apr 2026.