AtriCure, Inc.
US ˙ NasdaqGM ˙ US04963C2098

SecurityATRC / AtriCure, Inc.
InstitutionCommerce Bank
Latest Disclosed Ownership11,445 shares
Latest Disclosed Value $ 326,526
Commerce Bank reports 4.59% decrease in ownership of ATRC / AtriCure, Inc.

On May 11, 2026 - Commerce Bank filed a 13F-HR form disclosing ownership of 11,445 shares of AtriCure, Inc. (US:ATRC) valued at $326,526 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 11,995 shares of AtriCure, Inc.. This represents a change in shares of -4.59% during the quarter. The current value of the position is $299,859 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-11 2026-03-31 13F ATRICURE COM 04963C209 11,445 -550 -4.59 327 -31.22 0.0016
2026-02-13 2025-12-31 13F ATRICURE COM 04963C209 11,995 -115 -0.95 475 11.27 0.0026
2025-11-12 2025-09-30 13F ATRICURE COM 04963C209 12,110 -810 -6.27 427 0.71 0.0024
2025-08-07 2025-06-30 13F ATRICURE COM 04963C209 12,920 1,685 15.00 423 16.85 0.0025
2025-05-08 2025-03-31 13F ATRICURE COM 04963C209 11,235 -150 -1.32 362 4.32 0.0023
2025-02-13 2024-12-31 13F ATRICURE COM 04963C209 11,385 -85 -0.74 348 8.10 0.0021
2024-11-08 2024-09-30 13F ATRICURE COM 04963C209 11,470 2,181 23.48 322 52.13 0.0020
2024-08-12 2024-06-30 13F ATRICURE COM 04963C209 9,289 29 0.31 212 -24.91 0.0014
2024-05-03 2024-03-31 13F ATRICURE COM 04963C209 9,260 -806 -8.01 282 -21.73 0.0019
2024-02-09 2023-12-31 13F ATRICURE COM 04963C209 10,066 -703 -6.53 359 -23.78 0.0026
2023-11-14 2023-09-30 13F ATRICURE COM 04963C209 10,769 -147 -1.35 472 -12.45 0.0037
2023-08-08 2023-06-30 13F ATRICURE COM 04963C209 10,916 -441 -3.88 539 14.47 0.0040
2023-05-04 2023-03-31 13F ATRICURE COM 04963C209 11,357 602 5.60 471 -1.47 0.0037
2023-02-10 2022-12-31 13F ATRICURE COM 04963C209 10,755 -175 -1.60 477 11.71 0.0039
2022-11-04 2022-09-30 13F ATRICURE COM 04963C209 10,930 1,635 17.59 427 12.37 0.0037
2022-08-12 2022-06-30 13F ATRICURE COM 04963C209 9,295 0 0.00 380 -37.81 0.0031
2022-05-09 2022-03-31 13F ATRICURE COM 04963C209 9,295 -55 -0.59 611 -6.00 0.0042
2022-02-14 2021-12-31 13F ATRICURE COM 04963C209 9,350 0 0.00 650 0.00 0.0042
2021-11-09 2021-09-30 13F ATRICURE COM 04963C209 9,350 -633 -6.34 650 -17.93 0.0046
2021-08-09 2021-06-30 13F ATRICURE COM 04963C209 9,983 -1,350 -11.91 792 6.59 0.0056
2021-05-05 2021-03-31 13F ATRICURE COM 04963C209 11,333 -175 -1.52 743 15.91 0.0057
2021-02-09 2020-12-31 13F ATRICURE COM 04963C209 11,508 0 0.00 641 39.65 0.0052
2020-11-06 2020-09-30 13F ATRICURE COM 04963C209 11,508 -696 -5.70 459 -16.39 0.0042
2020-08-07 2020-06-30 13F ATRICURE COM 04963C209 12,204 -1,979 -13.95 549 15.34 0.0054
2020-05-08 2020-03-31 13F ATRICURE COM 04963C209 14,183 -1,202 -7.81 476 -4.80 0.0058
2020-02-14 2019-12-31 13F ATRICURE COM 04963C209 15,385 855 5.88 500 37.74 0.0048
2019-11-12 2019-09-30 13F ATRICURE COM 04963C209 14,530 0 0.00 363 -16.36 0.0037
2019-08-07 2019-06-30 13F ATRICURE COM 04963C209 14,530 14,530 434 0.0049
2019-05-08 2019-03-31 13F ATRICURE COM 04963C209 0 -6,930 -100.00 0 -100.00
2019-02-11 2018-12-31 13F ATRICURE COM 04963C209 6,930 6,930 213 0.0027
2018-02-12 2017-12-31 13F ATRICURE COM 04963C209 0 -10,982 -100.00 0 -100.00
2017-11-07 2017-09-30 13F ATRICURE COM 04963C209 10,982 0 0.00 266 0.00 0.0037
2017-08-08 2017-06-30 13F ATRICURE COM 04963C209 10,982 10,982 266 0.0037
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.