Security key
04963C209
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 50,021,272
- Total 13F value
- $1,462,827,790
- Share change
- +831,949
- SEC-reported price per share
- $28.53
- Number of holders
- 222
- Value change
- -$2,007,691
- Number of buys
- 109
- Number of sells
- 107
- Shares outstanding
- 50,892,753
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2026
Institutions
222
Top holders
10
ATRC full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q3 2026
AtriCure, Inc. SEC filings
AtriCure, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 04963C209
Recent filing periods:
Ownership snapshot
Top reported holders of ATRC - AtriCure, 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
VANGUARD GROUP INC
Comparable rows
6/15
Latest evidence
31 Mar 2026
13F
13D/G
Lead comparable stake: 6.8%
9 rows are not safely comparable across share classes.
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 6.8%.
6 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
6.8%
Hood River Capital Management LLC
6.2%
VANGUARD PORTFOLIO MANAGEMENT LLC
5.5%
VANGUARD CAPITAL MANAGEMENT LLC
5.1%
MACQUARIE GROUP LTD
4.6%
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
|
6.8%
Reported 13D/G
· 31 Mar 2026
|
$154,995,724
3,917,991 shares
|
— | 31 Dec 2025 |
| Hood River Capital Management LLC |
13D/G
13F
Company
|
6.2%
Reported 13D/G
· 31 Dec 2025
|
$122,501,931
3,096,611 shares
|
+$6,839,133 | 31 Dec 2025 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
Vanguard Portfolio Management
|
5.5%
Reported 13D/G
· 31 Mar 2026
|
$78,305,863
2,744,685 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
Vanguard Capital Management
|
5.1%
Reported 13D/G
· 31 Mar 2026
|
$72,265,491
2,532,965 shares
|
$0 | 31 Mar 2026 |
| MACQUARIE GROUP LTD |
13D/G
Macquarie Group Limited
|
4.6%
Reported 13D/G
· 30 Sep 2025
|
$80,700,257
2,289,369 shares
|
-$7,537,719 | 30 Sep 2025 |
| Champlain Investment Partners, LLC |
13D/G
13F
Company
|
4.4%
Reported 13D/G
· 31 Mar 2025
|
$71,407,964
2,137,963 shares
|
-$21,803,353 | 31 Mar 2025 |
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
222
Shares
50,021,272
Rows available
222
| 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
222
Q1 2026 holders
222
Holder diff
0
| Investor | Q1 2026 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q1 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend