Mackenzie Financial
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Mackenzie Financial’s iRhythm Holdings IRTC Stock Holding History

Mackenzie Financial’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 		– Sell
-371,475
Closed -$43.8M – 1627
2026
Q1 		$43.8M Buy
371,475
+24,171
+7% +$3.49M 0.05% 277
2025
Q4 		$61.9M Sell
347,304
-107,957
-24% -$19.1M 0.07% 221
2025
Q3 		$78.3M Sell
455,261
-274,552
-38% -$43.6M 0.09% 185
2025
Q2 		$112M Sell
729,813
-426,141
-37% -$55.1M 0.15% 140
2025
Q1 		$121M Sell
1,155,954
-225,988
-16% -$23.9M 0.17% 133
2024
Q4 		$125M Sell
1,381,942
-37,892
-3% -$2.98M 0.17% 137
2024
Q3 		$105M Sell
1,419,834
-8,490
-0.6% -$676K 0.15% 141
2024
Q2 		$154M Buy
1,428,324
+80,091
+6% +$8.18M 0.23% 105
2024
Q1 		$156M Buy
1,348,233
+83,526
+7% +$9.39M 0.23% 108
2023
Q4 		$135M Buy
1,264,707
+2,528
+0.2% +$220K 0.2% 118
2023
Q3 		$111M Buy
1,262,179
+41,052
+3% +$4.17M 0.19% 124
2023
Q2 		$127M Sell
1,221,127
-16,301
-1% -$1.96M 0.19% 122
2023
Q1 		$153M Sell
1,237,428
-9,096
-0.7% -$986K 0.24% 108
2022
Q4 		$117M Buy
1,246,524
+36,189
+3% +$3.94M 0.2% 121
2022
Q3 		$152M Sell
1,210,335
-3,094
-0.3% -$447K 0.26% 92
2022
Q2 		$131M Buy
1,213,429
+37,587
+3% +$4.98M 0.21% 117
2022
Q1 		$185M Sell
1,175,842
-509,588
-30% -$65.4M 0.25% 100
2021
Q4 		$198M Sell
1,685,430
-216,621
-11% -$19.9M 0.27% 96
2021
Q3 		$111M Buy
1,902,051
+88,698
+5% +$4.7M 0.16% 150
2021
Q2 		$120M Buy
+1,813,353
New +$144M 0.17% 144
2020
Q2 		– Sell
-14,936
Closed -$1.22M – 1072
2020
Q1 		$1.22M Sell
14,936
-2,698
-15% -$224K ﹤0.01% 599
2019
Q4 		$1.2M Buy
+17,634
New +$1.2M ﹤0.01% 702
2018
Q1 		– Sell
-9,230
Closed -$517K – 943
2017
Q4 		$517K Sell
9,230
-11,400
-55% -$596K ﹤0.01% 683
2017
Q3 		$1.07M Sell
20,630
-7,870
-28% -$356K 0.01% 442
2017
Q2 		$1.21M Hold
28,500
– – 0.01% 429
2017
Q1 		$1.07M Buy
+28,500
New +$981K 0.01% 453

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

Mackenzie Financial's IRTC Position: Q2 2026 in Review

Mackenzie Financial sold out of iRhythm Holdings (IRTC) in Q2 2026, closing a stake of 371,475 shares — an estimated $43.8M sold.

Mackenzie Financial first reported a position in IRTC in Q1 2017 and held it in 26 quarters. The position peaked at $198M in Q4 2021. 304 funds tracked by Wall St. Rank hold IRTC as of Q2 2026.

  • Mackenzie Financial reported no remaining iRhythm Holdings position as of Q2 2026 after selling out during the quarter.
  • Mackenzie Financial sold 371,475 iRhythm Holdings shares in Q2 2026, an estimated $43.8M.
  • Mackenzie Financial first reported a position in iRhythm Holdings in Q1 2017 and held it in 26 quarters.
  • Mackenzie Financial's iRhythm Holdings position peaked at $198M in Q4 2021.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q2 2026.

Based on Mackenzie Financial's 13F filing for Q2 2026, filed 13 Aug 2026.