Massachusetts Financial Services
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Massachusetts Financial Services’s iRhythm Holdings IRTC Stock Holding History

Massachusetts Financial Services’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 		$19.7M Sell
165,998
-639
-0.4% -$74.3K 0.01% 672
2026
Q1 		$19.7M Buy
166,637
+16,353
+11% +$2.36M 0.01% 645
2025
Q4 		$26.7M Sell
150,284
-10,266
-6% -$1.82M 0.01% 598
2025
Q3 		$27.6M Buy
160,550
+34,095
+27% +$5.42M 0.01% 582
2025
Q2 		$19.5M Buy
+126,455
New +$16.3M 0.01% 621
2020
Q4 		– Sell
-112,104
Closed -$26.7M – 912
2020
Q3 		$26.7M Sell
112,104
-84,922
-43% -$15M 0.01% 533
2020
Q2 		$22.8M Sell
197,026
-4,788
-2% -$528K 0.01% 534
2020
Q1 		$16.4M Sell
201,814
-81,219
-29% -$6.74M 0.01% 542
2019
Q4 		$19.3M Buy
283,033
+49,708
+21% +$3.37M 0.01% 534
2019
Q3 		$17.3M Buy
233,325
+47,896
+26% +$3.71M 0.01% 548
2019
Q2 		$14.7M Buy
185,429
+38,914
+27% +$2.83M 0.01% 582
2019
Q1 		$11M Buy
146,515
+30,128
+26% +$2.57M ﹤0.01% 603
2018
Q4 		$8.09M Buy
116,387
+29,801
+34% +$2.26M ﹤0.01% 624
2018
Q3 		$8.2M Sell
86,586
-33,411
-28% -$2.91M ﹤0.01% 648
2018
Q2 		$9.73M Sell
119,997
-63,772
-35% -$4.46M ﹤0.01% 632
2018
Q1 		$11.6M Sell
183,769
-23,456
-11% -$1.45M 0.01% 589
2017
Q4 		$11.6M Sell
207,225
-31,885
-13% -$1.67M ﹤0.01% 586
2017
Q3 		$12.4M Buy
239,110
+1,450
+0.6% +$65.7K 0.01% 566
2017
Q2 		$10.1M Buy
237,660
+59,702
+34% +$2.17M ﹤0.01% 602
2017
Q1 		$6.69M Sell
177,958
-31,581
-15% -$1.09M ﹤0.01% 630
2016
Q4 		$6.29M Buy
+209,539
New +$5.65M ﹤0.01% 641

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

Massachusetts Financial Services's IRTC Position: Q2 2026 in Review

Massachusetts Financial Services reduced its iRhythm Holdings (IRTC) stake by 0.38% in Q2 2026, selling an estimated $74.3K and leaving 165,998 shares worth $19.7M. The position accounts for 0.01% of the portfolio, ranked #672.

Massachusetts Financial Services first reported a position in IRTC in Q4 2016 and has held it in 21 quarters since. The position peaked at $27.6M in Q3 2025. 304 funds tracked by Wall St. Rank hold IRTC as of Q2 2026.

  • Massachusetts Financial Services held 165,998 shares of iRhythm Holdings worth $19.7M as of Q2 2026.
  • Massachusetts Financial Services sold 639 iRhythm Holdings shares in Q2 2026, an estimated $74.3K.
  • iRhythm Holdings made up 0.01% of Massachusetts Financial Services's portfolio in Q2 2026, its #672 holding.
  • Massachusetts Financial Services first reported a position in iRhythm Holdings in Q4 2016 and has held it in 21 quarters since.
  • Massachusetts Financial Services's iRhythm Holdings position peaked at $27.6M in Q3 2025.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q2 2026.

Based on Massachusetts Financial Services's 13F filing for Q2 2026, filed 3 Aug 2026.