Ticker · CUSIP 450056106

IRTC

IRHYTHM TECHNOLOGIES INC

Healthcare·Medical Devices

···Share

Holders (tracked)

Combined shares

4,318,984

Combined value

$766.36M

Last close

$125.32

Quarter

2025Q4

Price is -29.4% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$125.32+24.36 (+24.13%)H $189.25 · L $98.63 · Avg Vol 517K

Tracked holders · last 8 quarters

Flat over the last 8 quarters.

SEC event timeline

22 events

Wellington Management trimmed2026-02-17
−14,406 shares · 2025Q4
Position
Ken Griffin (Citadel Advisors) exited2026-02-17
−8,892 shares · 2025Q4
Position
D.E. Shaw & Co. added2026-02-17
+23,544 shares · 2025Q4
Position
AQR Capital Management added2026-02-17
+8,744 shares · 2025Q4
Position
Two Sigma Investments exited2026-02-17
−2,100 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) added2026-02-17
+548,519 shares · 2025Q4
Position
Steve Cohen (Point72) trimmed2026-02-17
−128,644 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+162,479 shares · 2025Q4
Position
Ray Dalio (Bridgewater Associates) opened position2026-02-13
+11,348 shares · 2025Q4
Position
Sands Capital Management trimmed2026-02-13
−536,465 shares · 2025Q4
Position
Renaissance Technologies trimmed2026-02-12
−17,500 shares · 2025Q4
Position
Norges Bank (Norway SWF) opened position2026-02-10
+56,237 shares · 2025Q4
Position
Steve Cohen (Point72) added2025-11-14
+26,014 shares · 2025Q3
Position
Two Sigma Investments added2025-11-14
+200 shares · 2025Q3
Position
AQR Capital Management added2025-11-14
+24,436 shares · 2025Q3
Position
D.E. Shaw & Co. added2025-11-14
+89,289 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) trimmed2025-11-14
−58,450 shares · 2025Q3
Position
T. Rowe Price added2025-11-14
+313,394 shares · 2025Q3
Position
Wellington Management added2025-11-14
+27,346 shares · 2025Q3
Position
Renaissance Technologies trimmed2025-11-13
−19,800 shares · 2025Q3
Position
Sands Capital Management trimmed2025-11-13
−679,417 shares · 2025Q3
Position
Norges Bank (Norway SWF) exited2025-11-12
−83,926 shares · 2024Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for IRTC →

Follow-the-investor returns

If you'd copied each holder of IRTC…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Wellington Management	2019Q1	$138.74	-9.7%	$51.2M
Renaissance Technologies	2017Q1	$145.91	-14.1%	$13.0M
Ray Dalio (Bridgewater Associates)	2021Q2	$150.24	-16.6%	$1.4M
Izzy Englander (Millennium Mgmt)	2016Q4	$151.75	-17.4%	$103.6M
D.E. Shaw & Co.	2017Q2	$158.02	-20.7%	$45.2M
Steve Cohen (Point72)	2016Q4	$158.18	-20.8%	$27.5M
AQR Capital Management	2018Q1	$160.57	-22.0%	$5.0M
T. Rowe Price	2016Q4	$170.98	-26.7%	$62.9M
Ken Griffin (Citadel Advisors)	2017Q1	$173.78	-27.9%	$1.1M
Ken Griffin (Citadel Advisors)	2017Q1	$173.78	-27.9%	$1.1M
Sands Capital Management	2020Q3	$179.47	-30.2%	$213.0M
Norges Bank (Norway SWF)	2017Q4	$54275.47	-99.8%	$7.0M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions2

Norges Bank (Norway SWF)
+56,237
$10.0M
Ray Dalio (Bridgewater Associates)
+11,348
$2.0M

Added to4

Izzy Englander (Millennium Mgmt)
+548,519
$97.3M
D.E. Shaw & Co.
+23,544
$4.2M
AQR Capital Management
+8,744
$1.6M
T. Rowe Price
+162,479
$29K

Trimmed4

Sands Capital Management
−536,465
$95.2M
Steve Cohen (Point72)
−128,644
$22.8M
Renaissance Technologies
−17,500
$3.1M
Wellington Management
−14,406
$2.6M

Exited2

Ken Griffin (Citadel Advisors)
−8,892
$1.5M
Two Sigma Investments
−2,100
$361K

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	13	6,933,318	$56.95B	—
2022Q2	17	7,859,728	$74.01B	+4
2022Q3	13	6,830,710	$855.8M	-4
2022Q4	13	6,691,890	$626.8M	—
2023Q1	16	6,141,968	$761.8M	+3
2023Q2	17	6,692,469	$698.2M	+1
2023Q3	17	6,377,420	$601.1M	—
2023Q4	13	5,895,777	$631.1M	-4
2024Q1	16	6,440,372	$747.1M	+3
2024Q2	13	6,500,361	$699.7M	-3
2024Q3	12	3,466,600	$257.4M	-1
2024Q4	10	3,638,967	$328.1M	-2
2025Q1	10	4,095,710	$428.7M	—
2025Q2	13	4,616,039	$710.7M	+3
2025Q3	12	4,174,420	$718.0M	-1
2025Q4	12	4,318,984	$766.4M	—

Who owns IRTC

12 super-investors · 2025Q4

Tracked stake

4.32M

Combined value

$766M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New2Added4Trim4Sold2

#	Manager	Shares	Value	% of book	Last action
1	Sands Capital Management	1.70M	$302M	0.9%	Trim−536.5K
2	Izzy Englander Millennium Mgmt	826.4K	$147M	0.1%	Added+548.5K
3	T. Rowe Price	502.1K	$89M	0.0%	Added+162.5K
4	Wellington Management	408.3K	$72M	0.0%	Trim−14.4K
5	D.E. Shaw & Co.	360.7K	$64M	0.0%	Added+23.5K
6	Steve Cohen Point72	219.5K	$39M	0.0%	Trim−128.6K
7	Renaissance Technologies	103.9K	$18M	0.0%	Trim−17.5K
8	Ken Griffin Citadel Advisors	82.1K	$15M	0.0%	Sold−8.9K
9	Norges Bank Norway SWF	56.2K	$10M	0.0%	New+56.2K
10	AQR Capital Management	40.2K	$7M	0.0%	Added+8.7K
11	Ray Dalio Bridgewater Associates	11.3K	$2M	0.0%	New+11.3K
12	Ken Griffin Citadel Advisors	8.7K	$2M	0.0%	Sold−8.9K

Recent moves

20 transactions

ADDAQR Capital Management
+8,744 · 2025Q4
SOLDKen Griffin (Citadel Advisors)
−8,892 · 2025Q4
ADDT. Rowe Price
+162,479 · 2025Q4
ADDIzzy Englander (Millennium Mgmt)
+548,519 · 2025Q4
ADDD.E. Shaw & Co.
+23,544 · 2025Q4
TRIMSteve Cohen (Point72)
−128,644 · 2025Q4
TRIMWellington Management
−14,406 · 2025Q4
SOLDTwo Sigma Investments
−2,100 · 2025Q4
TRIMSands Capital Management
−536,465 · 2025Q4
NEWRay Dalio (Bridgewater Associates)
+11,348 · 2025Q4
TRIMRenaissance Technologies
−17,500 · 2025Q4
NEWNorges Bank (Norway SWF)
+56,237 · 2025Q4
ADDSteve Cohen (Point72)
+26,014 · 2025Q3
ADDT. Rowe Price
+313,394 · 2025Q3
TRIMIzzy Englander (Millennium Mgmt)
−58,450 · 2025Q3
ADDTwo Sigma Investments
+200 · 2025Q3
ADDD.E. Shaw & Co.
+89,289 · 2025Q3
ADDWellington Management
+27,346 · 2025Q3
ADDAQR Capital Management
+24,436 · 2025Q3
TRIMRenaissance Technologies
−19,800 · 2025Q3

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