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Institutional ownership intelligence
Schedule 13G/A

INSP Schedule 13G/A filing by Citadel Advisors

Citadel Advisors reported beneficial ownership of 527.2K shares, representing 1.8% of INSPIRE MEDICAL SYSTEMS INC in this filing.

FiledFeb 17, 2026
Ownership dateDec 31, 2025
Reported shares527.2K
Reported ownership1.8%
Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 0
Shared voting power 527.2K
Sole dispositive power 0
Shared dispositive power 527.2K
Compared with the prior filing

How the reported position changed

This compares the current filing with the previous tracked Schedule 13 filing from the same reporting CIK for INSP. A change between filings does not by itself establish when shares were bought or sold.

Previous filingOct 6, 2025
Reported share change-1,185,825
Ownership percentage change-4 pts
Previous filingThis filing
Reported shares1.7M527.2K
Reported ownership5.8%1.8%
Price context

Price dates alongside the ownership filing

Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.

Close near filing date$60.39as of Feb 17, 2026
Latest tracked price$61.07as of Aug 5, 2026
Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer
Citadel Advisors
CIK
CIK0001423053
Accession
0001104659-26-016535
Form
Schedule 13G/A
Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.