Adage Capital Partners
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Adage Capital Partners’s iRhythm Holdings IRTC Stock Holding History

Adage Capital Partners’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 		$978K Sell
8,289
-116,711
-93% -$16.8M ﹤0.01% 869
2025
Q4 		$22.2M Buy
125,000
+75,000
+150% +$13.3M 0.03% 453
2025
Q3 		$8.6M Sell
50,000
-25,000
-33% -$3.97M 0.01% 661
2025
Q2 		$11.5M Sell
75,000
-25,000
-25% -$3.23M 0.02% 586
2025
Q1 		$10.5M Hold
100,000
– – 0.02% 574
2024
Q4 		$9.02M Buy
+100,000
New +$7.86M 0.02% 630
2024
Q2 		– Sell
-25,000
Closed -$2.9M – 910
2024
Q1 		$2.9M Buy
+25,000
New +$2.81M 0.01% 752
2019
Q2 		– Sell
-120,000
Closed -$8.99M – 739
2019
Q1 		$8.99M Buy
120,000
+20,000
+20% +$1.71M 0.02% 539
2018
Q4 		$6.95M Hold
100,000
– – 0.02% 565
2018
Q3 		$9.47M Sell
100,000
-100,000
-50% -$8.71M 0.02% 555
2018
Q2 		$16.2M Buy
200,000
+51,481
+35% +$3.6M 0.04% 454
2018
Q1 		$9.35M Sell
148,519
-100,242
-40% -$6.21M 0.02% 568
2017
Q4 		$13.9M Sell
248,761
-1,239
-0.5% -$64.8K 0.03% 513
2017
Q3 		$13M Hold
250,000
– – 0.03% 515
2017
Q2 		$10.6M Buy
+250,000
New +$9.1M 0.03% 551

Other funds holding IRTC

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
RI
RTW Investments New York $10B AUM 135.35% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $41.5B AUM 42.97% 1-Year Est. Return
UBS AM
UBS AM Chicago, Illinois $481B AUM 26.39% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Adage Capital Partners's IRTC Position: Q1 2026 in Review

Adage Capital Partners reduced its iRhythm Holdings (IRTC) stake by 93% in Q1 2026, selling an estimated $16.8M and leaving 8,289 shares worth $978K. The position accounts for ﹤0.01% of the portfolio, ranked #869.

Adage Capital Partners first reported a position in IRTC in Q2 2017 and has held it in 15 quarters since. The position peaked at $22.2M in Q4 2025. 304 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Adage Capital Partners held 8,289 shares of iRhythm Holdings worth $978K as of Q1 2026.
  • Adage Capital Partners sold 116,711 iRhythm Holdings shares in Q1 2026, an estimated $16.8M.
  • iRhythm Holdings made up ﹤0.01% of Adage Capital Partners's portfolio in Q1 2026, its #869 holding.
  • Adage Capital Partners first reported a position in iRhythm Holdings in Q2 2017 and has held it in 15 quarters since.
  • Adage Capital Partners's iRhythm Holdings position peaked at $22.2M in Q4 2025.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Adage Capital Partners's 13F filing for Q1 2026, filed 15 May 2026.