Security key
457730109
Inspire Medical Systems, Inc. - Common Stock (INSP)
CUSIP: 457730109
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 34,859,778
- Total 13F value
- $1,797,956,121
- Share change
- +1,015,665
- Put/Call ratio
- 353%
- SEC-reported price per share
- $51.58
- Number of holders
- 298
- Value change
- -$107,368,943
- Number of buys
- 170
- Number of sells
- 188
- Shares outstanding
- 28,848,250
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2026
Institutions
298
Top holders
10
INSP full security history
Ownership snapshot
Full 13F holder table
Inspire Medical Systems, Inc. SEC filings
Inspire Medical Systems, Inc. company facts
Broader feeds
Ownership snapshot
Top reported holders of INSP - Inspire Medical Systems, Inc. - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
WELLINGTON MANAGEMENT GRO...
Disclosed value leader
BlackRock, Inc.
Comparable rows
15/15
Latest evidence
31 Mar 2026
13F
13D/G
3/4/5
Lead comparable stake: 8.8%
13D/G row: WELLINGTON MANAGEMENT GROUP LLP
Showing 1-6 of 15 holder rows.
Quick read
WELLINGTON MANAGEMENT GROUP LLP leads the comparable SEC ownership view at 8.8%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens WELLINGTON MANAGEMENT GROUP LLP's linked filing trail.
Comparable ownership
Top 5
WELLINGTON MANAGEMENT GROUP LLP
8.8%
VANGUARD CAPITAL MANAGEMENT LLC
5.1%
FMR LLC
2.5%
CITADEL ADVISORS LLC
1.8%
WASATCH ADVISORS LP
0.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP |
13F
13D/G
Company
|
8.8%
from 13D/G
|
$203,928,923
2,211,091 shares
|
— | 31 Dec 2025 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
Vanguard Capital Management
|
5.1%
|
$75,807,281
1,469,703 shares
|
$0 | 31 Mar 2026 |
| FMR LLC |
13D/G
13F
Company
|
2.5%
|
$55,005,358
741,312 shares
|
-$130,571,372 | 30 Sep 2025 |
| CITADEL ADVISORS LLC |
13D/G
13F
Kenneth Griffin · Company
|
1.8%
|
$50,085,615
527,217 shares
|
-$112,653,375 | 31 Dec 2025 |
| WASATCH ADVISORS LP |
13F
13D/G
Company
|
0.5%
from 13D/G
|
$10,704,952
116,068 shares
|
— | 31 Dec 2025 |
| Timothy P. Herbert |
3/4/5
CEO and President, Director
|
0.57%
|
$13,211,787
163,492 shares
|
— | 20 Feb 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
298
Shares
34,859,778
Rows available
298
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2026 vs Q1 2026 Across Filers
Q1 2026 holders
298
Q1 2026 holders
298
Holder diff
0
| Investor | Q1 2026 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q1 2026 value | Value change | Value Chg % |
|---|