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INSP in the 13F filings

Inspire Med Sys Inc · CUSIP 457730109

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
18 May 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
26
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 7 listed it in both
Shares listed
8,030,417
combined, among listed positions
Reported value
$415m
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 -451,515.

Managers listing INSP 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.

26 of 26 holders

ActionFiling
Wellington Management Group LLP2,535,954$131munder 0.1%Added+324,86315 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.1,188,537$61munder 0.1%Trimmed-23,62515 May 2026 (the filing on sec.gov)
Artisan Partners LP780,575$40m0.06%Trimmed-5,16713 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC469,968$24munder 0.1%Added+59,20014 May 2026 (the filing on sec.gov)
Citadel Advisors LLC394,076$20munder 0.1%Trimmed-117,24215 May 2026 (the filing on sec.gov)
Millennium Management LLC386,146$20munder 0.1%Added+184,00615 May 2026 (the filing on sec.gov)
Walleye Capital LLC358,489$18m0.08%Added+280,27213 May 2026 (the filing on sec.gov)
AQR Capital Management LLC308,662$16munder 0.1%Added+281,62215 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP210,573$11munder 0.1%Added+162,07615 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC209,486$11munder 0.1%Added+186,07113 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc181,313$9.4munder 0.1%Trimmed-126,85815 May 2026 (the filing on sec.gov)
Bridgewater Associates LP173,533$9.0munder 0.1%Added+101,80615 May 2026 (the filing on sec.gov)
Tudor Investment Corp167,218$8.6munder 0.1%Added+54,34515 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC151,856$7.8munder 0.1%Trimmed-35,37015 May 2026 (the filing on sec.gov)
Invesco Ltd103,973$5.4munder 0.1%Trimmed-157,40112 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC100,207$5.2munder 0.1%Trimmed-87,89315 May 2026 (the filing on sec.gov)
Two Sigma Investments LP85,096$4.4munder 0.1%Added+25,58115 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC66,814$3.4munder 0.1%Added+59,99215 May 2026 (the filing on sec.gov)
Man Group PLC54,488$2.8munder 0.1%Added+13,06315 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)37,984$2.0munder 0.1%Trimmed-99,32215 May 2026 (the filing on sec.gov)
AllianceBernstein LP15,160$1.4munder 0.1%Trimmed-15,47615 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC24,180$1.2munder 0.1%Trimmed-76715 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd13,451$694kunder 0.1%Trimmed-548,88018 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP5,457$281kunder 0.1%Trimmed-5,32815 May 2026 (the filing on sec.gov)
Winton Group Ltd4,200$217kunder 0.1%Added+10012 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 (1)

Exited (7)

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.
11 in Q3 2024 to 3 in Q2 2026

Tracked managers listing it, at least.

0510152020192020202120222023202420252026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
INSP by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20181$1.2mn.a.n.a.
Q4 20181$7.0mn.a.n.a.
Q1 20192$6.5mn.a.n.a.
Q2 20192$2.2mn.a.n.a.
Q4 20191$385kn.a.n.a.
Q1 20204$7.0mn.a.n.a.
Q2 20205$422mn.a.n.a.
Q3 20208$638mn.a.n.a.
Q4 202010$936mn.a.n.a.
Q1 202110$790mn.a.n.a.
Q2 202111$277mn.a.n.a.
Q3 202111$486mn.a.n.a.
Q4 202110$282mn.a.n.a.
Q1 202214$1.3bnn.a.n.a.
Q2 202213$790mn.a.n.a.
Q3 202214$436mn.a.n.a.
Q4 202215$740mn.a.n.a.
Q1 202315$738mn.a.n.a.
Q2 202318$1.2bnn.a.n.a.
Q3 202313$1.1bnn.a.n.a.
Q4 202310$1.6bn92
Q1 20248$2.0bn46
Q2 20247$666m64
Q3 202411$1.6bn74
Q4 202411$1.2bn66
Q1 202510$627m64
Q2 20257$649m44
Q3 20258$232m63
Q4 202510$554m1820
Q1 20264$199m1419
Q2 20263$45m1315

Compare with…

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

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

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 INSP, latest filings →Back to the 13F Explorer →