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ATRC · AtriCure, Inc.

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$48.98 +1.49 (+3.14%) At close · Aug 21
Market Cap
$2.49B
Shares
50.87M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 252
Total Value: $1,472,730,426
Total Shares: 52,635,145

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 252 13F filers · Δ vs Mar 31, 2026
Top Holder
8.5%
Sep 2023 → Jun 2026 · range 8.1% – 10.3%
+0.4 pts
Top 5
31.9%
Sep 2023 → Jun 2026 · range 31.9% – 41.0%
−1.1 pts
Top 10
47.5%
Sep 2023 → Jun 2026 · range 46.8% – 57.4%
−2.3 pts
HHI
318
Sep 2023 → Jun 2026 · range 318 – 442
Broadly held−21

Quarterly Activity

vs Mar 31, 2026
New
55
Increased
102
Decreased
59
Sold Out
26
Unchanged
36
Holder count: +29
Institutional value: +3.2%
Shares held: +5.2%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 256
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1323885 CUSIP 04963C209 13F (30d) 235 filings 230 filers Visit website Investor relations