AtriCure, Inc.
US ˙ NasdaqGM ˙ US04963C2098

SecurityATRC / AtriCure, Inc.
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership42,877 shares
Latest Disclosed Value $ 1,223,281
Engineers Gate Manager LP reports 26.68% decrease in ownership of ATRC / AtriCure, Inc.

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 42,877 shares of AtriCure, Inc. (US:ATRC) valued at $1,223,281 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 58,479 shares of AtriCure, Inc.. This represents a change in shares of -26.68% during the quarter. The current value of the position is $1,123,377 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)
2026-05-15 2026-03-31 13F ATRICURE COM 04963C209 42,877 -15,602 -26.68 1,223 -47.12 0.0153
2026-02-17 2025-12-31 13F ATRICURE COM 04963C209 58,479 29,839 104.19 2,313 129.24 0.0274
2025-11-14 2025-09-30 13F ATRICURE COM 04963C209 28,640 -6,009 -17.34 1,010 -11.10 0.0116
2025-08-14 2025-06-30 13F ATRICURE COM 04963C209 34,649 -3,854 -10.01 1,135 -8.62 0.0141
2025-05-15 2025-03-31 13F ATRICURE COM 04963C209 38,503 3,983 11.54 1,242 17.84 0.0209
2025-02-14 2024-12-31 13F ATRICURE COM 04963C209 34,520 -26,696 -43.61 1,055 -38.58 0.0184
2024-11-14 2024-09-30 13F ATRICURE COM 04963C209 61,216 -100,057 -62.04 1,716 -53.27 0.0335
2024-08-14 2024-06-30 13F ATRICURE COM 04963C209 161,273 -9,818 -5.74 3,672 -29.44 0.0828
2024-05-15 2024-03-31 13F ATRICURE COM 04963C209 171,091 107,558 169.29 5,205 129.55 0.1370
2024-02-14 2023-12-31 13F ATRICURE COM 04963C209 63,533 13,417 26.77 2,267 3.28 0.0647
2023-11-14 2023-09-30 13F ATRICURE COM 04963C209 50,116 3,392 7.26 2,195 -4.81 0.0811
2023-08-14 2023-06-30 13F ATRICURE COM 04963C209 46,724 -13,674 -22.64 2,306 -7.87 0.0872
2023-05-15 2023-03-31 13F ATRICURE COM 04963C209 60,398 50,432 506.04 2,503 466.29 0.1046
2023-02-14 2022-12-31 13F ATRICURE COM 04963C209 9,966 -8,821 -46.95 442 -39.86 0.0266
2022-11-14 2022-09-30 13F ATRICURE COM 04963C209 18,787 -76,523 -80.29 735 -81.12 0.0457
2022-08-15 2022-06-30 13F ATRICURE COM 04963C209 95,310 89,687 1,595.00 3,894 955.28 0.1427
2022-05-16 2022-03-31 13F ATRICURE COM 04963C209 5,623 2,643 88.69 369 78.26 0.0144
2022-02-14 2021-12-31 13F ATRICURE COM 04963C209 2,980 -32,499 -91.60 207 -91.61 0.0093
2021-11-15 2021-09-30 13F ATRICURE COM 04963C209 35,479 20,106 130.79 2,468 102.30 0.1406
2021-08-16 2021-06-30 13F ATRICURE COM 04963C209 15,373 15,373 1,220 0.0785
2021-05-17 2021-03-31 13F ATRICURE COM 04963C209 0 -4,919 -100.00 0 -100.00
2021-02-16 2020-12-31 13F ATRICURE COM 04963C209 4,919 4,919 274 0.0119
2020-11-16 2020-09-30 13F ATRICURE COM 04963C209 0 -12,632 -100.00 0 -100.00
2020-08-17 2020-06-30 13F ATRICURE COM 04963C209 12,632 -17,003 -57.37 568 -42.91 0.0289
2020-05-15 2020-03-31 13F ATRICURE COM 04963C209 29,635 -5,813 -16.40 995 -13.63 0.0717
2020-02-14 2019-12-31 13F ATRICURE COM 04963C209 35,448 -32,032 -47.47 1,152 -31.55 0.0507
2019-11-14 2019-09-30 13F ATRICURE COM 04963C209 67,480 23,415 53.14 1,683 27.98 0.0855
2019-08-14 2019-06-30 13F ATRICURE COM 04963C209 44,065 14,580 49.45 1,315 66.46 0.0726
2019-05-15 2019-03-31 13F ATRICURE COM 04963C209 29,485 -1,270 -4.13 790 -16.05 0.0478
2019-02-14 2018-12-31 13F ATRICURE COM 04963C209 30,755 15,868 106.59 941 80.61 0.0753
2018-11-01 2018-09-30 13F ATRICURE COM 04963C209 14,887 14,887 521 0.0400
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.