AtriCure, Inc.
US ˙ NasdaqGM ˙ US04963C2098

SecurityATRC / AtriCure, Inc.
InstitutionAssetmark, Inc
Latest Disclosed Ownership1,495 shares
Latest Disclosed Value $ 42,652
Assetmark, Inc reports 4.84% decrease in ownership of ATRC / AtriCure, Inc.

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 1,495 shares of AtriCure, Inc. (US:ATRC) valued at $42,652 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 1,571 shares of AtriCure, Inc.. This represents a change in shares of -4.84% during the quarter. The current value of the position is $40,769 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)
2026-05-06 2026-03-31 13F ATRICURE COM 04963C209 1,495 -76 -4.84 43 -32.26 0.0001
2026-01-23 2025-12-31 13F ATRICURE COM 04963C209 1,571 0 0.00 62 12.73 0.0001
2025-11-06 2025-09-30 13F ATRICURE COM 04963C209 1,571 0 0.00 55 7.84 0.0001
2025-08-04 2025-06-30 13F ATRICURE COM 04963C209 1,571 185 13.35 51 15.91 0.0001
2025-05-06 2025-03-31 13F ATRICURE COM 04963C209 1,386 0 0.00 45 4.76 0.0001
2025-02-06 2024-12-31 13F ATRICURE COM 04963C209 1,386 -20 -1.42 42 7.69 0.0001
2024-11-01 2024-09-30 13F ATRICURE COM 04963C209 1,406 -27,910 -95.20 39 -94.15 0.0001
2024-08-13 2024-06-30 13F ATRICURE COM 04963C209 29,316 7,963 37.29 668 2.77 0.0021
2024-05-07 2024-03-31 13F ATRICURE COM 04963C209 21,353 3,856 22.04 650 4.01 0.0021
2024-02-09 2023-12-31 13F ATRICURE COM 04963C209 17,497 7,451 74.17 624 41.82 0.0023
2023-10-27 2023-09-30 13F ATRICURE COM 04963C209 10,046 1,537 18.06 440 4.76 0.0018
2023-08-11 2023-06-30 13F ATRICURE INC COM COM 04963C209 8,509 1,665 24.33 420 48.41 0.0016
2023-05-05 2023-03-31 13F ATRICURE INC COM COM 04963C209 6,844 865 14.47 284 6.79 0.0012
2023-02-10 2022-12-31 13F ATRICURE COM 04963C209 5,979 1,689 39.37 265 57.74 0.0012
2022-11-01 2022-09-30 13F ATRICURE COM 04963C209 4,290 1,398 48.34 168 42.37 0.0008
2022-08-03 2022-06-30 13F ATRICURE INC COM COM 04963C209 2,892 1,428 97.54 118 22.92 0.0005
2022-05-13 2022-03-31 13F ATRICURE INC COM COM 04963C209 1,464 454 44.95 96 37.14 0.0004
2022-02-14 2021-12-31 13F ATRICURE INC COM COM 04963C209 1,010 0 0.00 70 0.00 0.0003
2021-11-12 2021-09-30 13F ATRICURE INC COM COM 04963C209 1,010 0 0.00 70 -12.50 0.0003
2021-08-16 2021-06-30 13F ATRICURE INC COM COM 04963C209 1,010 -25 -2.42 80 17.65 0.0004
2021-05-14 2021-03-31 13F ATRICURE COM 04963C209 1,035 0 0.00 68 17.24 0.0004
2021-02-10 2020-12-31 13F ATRICURE INC COM COM 04963C209 1,035 0 0.00 58 41.46 0.0003
2020-11-13 2020-09-30 13F ATRICURE INC COM COM 04963C209 1,035 0 0.00 41 -12.77 0.0003
2020-08-11 2020-06-30 13F ATRICURE INC COM COM 04963C209 1,035 -150 -12.66 47 17.50 0.0003
2020-05-12 2020-03-31 13F ATRICURE INC COM COM 04963C209 1,185 -90 -7.06 40 -2.44 0.0003
2020-02-11 2019-12-31 13F ATRICURE INC COM COM 04963C209 1,275 300 30.77 41 70.83 0.0003
2019-11-13 2019-09-30 13F ATRICURE INC COM COM 04963C209 975 0 0.00 24 -17.24 0.0002
2019-08-14 2019-06-30 13F ATRICURE INC COM COM 04963C209 975 510 109.68 29 141.67 0.0002
2019-05-14 2019-03-31 13F ATRICURE INC COM COM 04963C209 465 0 0.00 12 -14.29 0.0001
2019-02-13 2018-12-31 13F ATRICURE INC COM COM 04963C209 465 465 14 0.0001
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.