Calamos Advisors
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Calamos Advisors’s iRhythm Holdings IRTC Stock Holding History

Calamos Advisors’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
2025
Q4 		– Sell
-7,494
Closed -$1.29M – 966
2025
Q3 		$1.29M Buy
+7,494
New +$1.19M ﹤0.01% 672
2024
Q3 		– Sell
-6,099
Closed -$656K – 972
2024
Q2 		$656K Buy
+6,099
New +$623K ﹤0.01% 689
2022
Q4 		– Sell
-45,262
Closed -$5.67M – 1280
2022
Q3 		$5.67M Buy
45,262
+11,278
+33% +$1.63M 0.03% 645
2022
Q2 		$3.67M Buy
33,984
+4,013
+13% +$532K 0.02% 801
2022
Q1 		$4.72M Buy
+29,971
New +$3.85M 0.02% 745
2020
Q3 		– Sell
-4,428
Closed -$513K – 724
2020
Q2 		$513K Buy
+4,428
New +$488K ﹤0.01% 680

Other funds holding IRTC

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Sands Capital Management
Sands Capital Management Arlington, Virginia $25.5B AUM 26.46% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
UBS AM
UBS AM Chicago, Illinois $481B AUM 26.39% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Calamos Advisors's IRTC Position: Q4 2025 in Review

Calamos Advisors sold out of iRhythm Holdings (IRTC) in Q4 2025, closing a stake of 7,494 shares — an estimated $1.29M sold.

Calamos Advisors first reported a position in IRTC in Q2 2020 and held it in 6 quarters. The position peaked at $5.67M in Q3 2022. 334 funds tracked by Wall St. Rank hold IRTC as of Q4 2025.

  • Calamos Advisors reported no remaining iRhythm Holdings position as of Q4 2025 after selling out during the quarter.
  • Calamos Advisors sold 7,494 iRhythm Holdings shares in Q4 2025, an estimated $1.29M.
  • Calamos Advisors first reported a position in iRhythm Holdings in Q2 2020 and held it in 6 quarters.
  • Calamos Advisors's iRhythm Holdings position peaked at $5.67M in Q3 2022.
  • 334 funds tracked by Wall St. Rank held iRhythm Holdings as of Q4 2025.

Based on Calamos Advisors's 13F filing for Q4 2025, filed 29 Jan 2026.