L3VLUP
ProSign in

IRTC in the 13F filings

Irhythm Technologies Inc · CUSIP 450056106

Sector · Medical devices and instrumentsTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Surgical, medical and electromedical devices
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Dec 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 22 Jan 2026
Managers listing it
32
at least, of 95 tracked, among listed positions
Comparable managers
92
filed both Q3 2025 and Q4 2025; 8 listed it in both
Shares listed
8,615,699
combined, among listed positions
Reported value
$1.5bn
combined, at the quarter end

Among the 92 comparable managers: 21 buyers (opened or added shares) and 12 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +40,182.

Managers listing IRTC in Q4 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q3 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

32 of 32 holders

ActionFiling
Artisan Partners LP1,511,992$268m0.40%Trimmed-1,055,52117 Feb 2026 (the filing on sec.gov)
Capital Research Global Investors1,184,746$210munder 0.1%Added+1,01011 Feb 2026 (the filing on sec.gov)
Millennium Management LLC826,376$147m0.06%Added+548,51917 Feb 2026 (the filing on sec.gov)
Holocene Advisors LP683,568$121m0.25%Added+210,28817 Feb 2026 (the filing on sec.gov)
Fidelity (FMR LLC)628,766$112munder 0.1%Added+4,67117 Feb 2026 (the filing on sec.gov)
Arrowstreet Capital LP606,969$108m0.06%Added+65,93013 Feb 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc502,120$89munder 0.1%Added+162,47917 Feb 2026 (the filing on sec.gov)
Invesco Ltd498,385$88munder 0.1%Added+95,24819 Feb 2026 (the filing on sec.gov)
Wellington Management Group LLP408,256$72munder 0.1%Trimmed-14,40617 Feb 2026 (the filing on sec.gov)
D. E. Shaw & Co.360,669$64munder 0.1%Added+23,54417 Feb 2026 (the filing on sec.gov)
Point72 Asset Management LP219,468$39munder 0.1%Trimmed-128,64417 Feb 2026 (the filing on sec.gov)
Jane Street Group LLC192,391$34munder 0.1%Added+99,95312 Feb 2026 (the filing on sec.gov)
Balyasny Asset Management LLC167,274$30munder 0.1%Newnew17 Feb 2026 (the filing on sec.gov)
MFS Investment Management150,284$27munder 0.1%Trimmed-10,26622 Jan 2026 (the filing on sec.gov)
Walleye Capital LLC127,596$23m0.07%Added+31,68413 Feb 2026 (the filing on sec.gov)
Renaissance Technologies LLC103,900$18munder 0.1%Trimmed-17,50012 Feb 2026 (the filing on sec.gov)
Squarepoint Ops LLC93,708$17munder 0.1%Trimmed-87,32713 Feb 2026 (the filing on sec.gov)
Freestone Grove Partners LP63,140$11m0.08%Newnew17 Feb 2026 (the filing on sec.gov)
Man Group PLC56,202$10.0munder 0.1%Trimmed-150,22017 Feb 2026 (the filing on sec.gov)
Steadfast Capital Management LP41,000$7.3m0.12%Added+1,30017 Feb 2026 (the filing on sec.gov)
AQR Capital Management LLC40,165$7.1munder 0.1%Added+8,74417 Feb 2026 (the filing on sec.gov)
AllianceBernstein LP37,489$6.7munder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Neuberger Berman Group LLC31,195$5.5munder 0.1%Added+29,73227 Oct 2026 (the filing on sec.gov)
Verition Fund Management LLC19,600$3.5munder 0.1%Trimmed-3,87713 Feb 2026 (the filing on sec.gov)
Janus Henderson Group Ltd13,856$2.5munder 0.1%Held017 Feb 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q3 2025 to Q4 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (5)

Exited (3)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
5 in Q3 2024 to 5 in Q2 2026

Tracked managers listing it, at least.

0510152017201820192020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
IRTC by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20162$45mn.a.n.a.
Q1 20171$44mn.a.n.a.
Q2 20174$163mn.a.n.a.
Q3 20174$191mn.a.n.a.
Q4 20174$220mn.a.n.a.
Q1 20185$249mn.a.n.a.
Q2 20185$365mn.a.n.a.
Q3 20187$388mn.a.n.a.
Q4 20188$302mn.a.n.a.
Q1 20196$238mn.a.n.a.
Q2 20198$344mn.a.n.a.
Q3 20196$213mn.a.n.a.
Q4 20197$303mn.a.n.a.
Q1 20206$306mn.a.n.a.
Q2 20207$636mn.a.n.a.
Q3 202010$1.4bnn.a.n.a.
Q4 202011$1.7bnn.a.n.a.
Q1 202110$663mn.a.n.a.
Q2 20218$152mn.a.n.a.
Q3 20215$44mn.a.n.a.
Q4 20215$213mn.a.n.a.
Q1 20229$700mn.a.n.a.
Q2 20229$434mn.a.n.a.
Q3 20227$555mn.a.n.a.
Q4 20227$521mn.a.n.a.
Q1 202310$714mn.a.n.a.
Q2 20238$608mn.a.n.a.
Q3 20235$602mn.a.n.a.
Q4 20239$835m81
Q1 20247$851m34
Q2 20245$864m42
Q3 20245$475m14
Q4 20244$406m03
Q1 20256$603m60
Q2 202510$847m64
Q3 20258$938m53
Q4 20258$895m2112
Q1 20267$718m1419
Q2 20265$516m1317

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

IRTC and LLY →IRTC and JNJ →IRTC and VRTX →Choose a stock to compare with IRTC →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own IRTC, latest filings →Back to the 13F Explorer →