Mariner
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Mariner’s iRhythm Holdings IRTC Stock Holding History

Mariner’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
-2,975
Closed -$528K – 3695
2025
Q4 		$528K Sell
2,975
-666
-18% -$118K ﹤0.01% 2407
2025
Q3 		$626K Buy
3,641
+793
+28% +$126K ﹤0.01% 2253
2025
Q2 		$438K Sell
2,848
-910
-24% -$118K ﹤0.01% 2439
2025
Q1 		$393K Buy
3,758
+981
+35% +$104K ﹤0.01% 2395
2024
Q4 		$250K Sell
2,777
-1,086
-28% -$85.3K ﹤0.01% 2799
2024
Q3 		$286K Buy
3,863
+547
+16% +$43.6K ﹤0.01% 2609
2024
Q2 		$357K Buy
3,316
+257
+8% +$26.3K ﹤0.01% 2318
2024
Q1 		$355K Sell
3,059
-23
-0.7% -$2.59K ﹤0.01% 2305
2023
Q4 		$330K Sell
3,082
-668
-18% -$58.2K ﹤0.01% 2250
2023
Q3 		$353K Buy
3,750
+620
+20% +$63K ﹤0.01% 2011
2023
Q2 		$327K Sell
3,130
-2,221
-42% -$267K ﹤0.01% 2057
2023
Q1 		$663K Buy
5,351
+171
+3% +$18.5K ﹤0.01% 1521
2022
Q4 		$485K Sell
5,180
-1,677
-24% -$183K ﹤0.01% 1667
2022
Q3 		$859K Buy
+6,857
New +$990K ﹤0.01% 1130

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

Mariner's IRTC Position: Q1 2026 in Review

Mariner sold out of iRhythm Holdings (IRTC) in Q1 2026, closing a stake of 2,975 shares — an estimated $528K sold.

Mariner first reported a position in IRTC in Q3 2022 and held it in 14 quarters. The position peaked at $859K in Q3 2022. 305 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Mariner reported no remaining iRhythm Holdings position as of Q1 2026 after selling out during the quarter.
  • Mariner sold 2,975 iRhythm Holdings shares in Q1 2026, an estimated $528K.
  • Mariner first reported a position in iRhythm Holdings in Q3 2022 and held it in 14 quarters.
  • Mariner's iRhythm Holdings position peaked at $859K in Q3 2022.
  • 305 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Mariner's 13F filing for Q1 2026, filed 13 May 2026.