Citigroup
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Citigroup’s iRhythm Holdings IRTC Stock Holding History

Citigroup’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
2018
Q4 		– Sell
-6,000
Closed -$568K – 7740
2018
Q3 		$568K Buy
+6,000
New +$523K ﹤0.01% 4123
2018
Q2 		– Sell
-5,300
Closed -$334K – 7659
2018
Q1 		$334K Buy
+5,300
New +$328K ﹤0.01% 4421

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

Citigroup's IRTC Position: Q1 2026 in Review

Citigroup increased its iRhythm Holdings (IRTC) stake by 22% in Q1 2026, buying an estimated $6.03M and bringing the position to 232,123 shares worth $27.4M. The position accounts for 0.01% of the portfolio, ranked #910.

Citigroup first reported a position in IRTC in Q4 2016 and has held it in 38 quarters since. The position peaked at $33.8M in Q4 2025. 304 funds tracked by Wall St. Rank hold IRTC as of Q1 2026.

  • Citigroup held 232,123 shares of iRhythm Holdings worth $27.4M as of Q1 2026.
  • Citigroup bought 41,788 iRhythm Holdings shares in Q1 2026, an estimated $6.03M.
  • iRhythm Holdings made up 0.01% of Citigroup's portfolio in Q1 2026, its #910 holding.
  • Citigroup first reported a position in iRhythm Holdings in Q4 2016 and has held it in 38 quarters since.
  • Citigroup's iRhythm Holdings position peaked at $33.8M in Q4 2025.
  • 304 funds tracked by Wall St. Rank held iRhythm Holdings as of Q1 2026.

Based on Citigroup's 13F filing for Q1 2026, filed 11 May 2026.