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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 Mar 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
28
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 5 listed it in both
Shares listed
9,380,169
combined, among listed positions
Reported value
$1.1bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 14 buyers (opened or added shares) and 19 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +764,470.

Managers listing IRTC in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

28 of 28 holders

ActionFiling
Millennium Management LLC1,608,014$190m0.08%Added+781,63815 May 2026 (the filing on sec.gov)
Artisan Partners LP1,450,907$171m0.27%Trimmed-61,08513 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)1,361,919$161munder 0.1%Added+733,15315 May 2026 (the filing on sec.gov)
Holocene Advisors LP1,248,658$147m0.36%Added+565,09015 May 2026 (the filing on sec.gov)
Point72 Asset Management LP599,405$71m0.09%Added+379,93715 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP582,879$69munder 0.1%Trimmed-24,09014 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.554,266$65munder 0.1%Added+193,59715 May 2026 (the filing on sec.gov)
Capital Research Global Investors509,590$60munder 0.1%Trimmed-675,15613 May 2026 (the filing on sec.gov)
Invesco Ltd297,452$35munder 0.1%Trimmed-200,93312 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC194,429$23munder 0.1%Added+27,15515 May 2026 (the filing on sec.gov)
MFS Investment Management166,637$20munder 0.1%Added+16,35314 May 2026 (the filing on sec.gov)
Citadel Advisors LLC113,600$13munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Jane Street Group LLC112,864$13munder 0.1%Trimmed-79,52712 May 2026 (the filing on sec.gov)
Wellington Management Group LLP90,460$11munder 0.1%Trimmed-317,79615 May 2026 (the filing on sec.gov)
Man Group PLC88,210$10munder 0.1%Added+32,00815 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC88,133$10m0.07%Added+76,87515 May 2026 (the filing on sec.gov)
AllianceBernstein LP36,299$6.4munder 0.1%Trimmed-1,19015 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC53,800$6.3munder 0.1%Trimmed-50,10014 May 2026 (the filing on sec.gov)
Two Sigma Investments LP52,600$6.2munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc35,687$4.2munder 0.1%Trimmed-466,43315 May 2026 (the filing on sec.gov)
AQR Capital Management LLC34,590$4.1munder 0.1%Trimmed-5,57515 May 2026 (the filing on sec.gov)
Verition Fund Management LLC34,565$4.1munder 0.1%Added+14,96515 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP24,151$2.9munder 0.1%Added+19,39215 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP16,787$2.0munder 0.1%Added+11,81215 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd13,856$1.6munder 0.1%Held018 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, 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 (2)

Exited (6)

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 →