AtriCure, Inc.
US ˙ NasdaqGM ˙ US04963C2098

SecurityATRC / AtriCure, Inc.
InstitutionD. E. Shaw & Co., Inc.
ManagerDE Shaw
Latest Disclosed Ownership56,589 shares
Latest Disclosed Value $ 1,614,484
D. E. Shaw & Co., Inc. ownership in ATRC / AtriCure, Inc.

On May 15, 2026 - D. E. Shaw & Co., Inc. filed a 13F-HR form disclosing ownership of 56,589 shares of AtriCure, Inc. (US:ATRC) valued at $1,614,484 USD as of March 31, 2026. The entity filed a previous 13F-HR on November 14, 2025 disclosing 0 shares of AtriCure, Inc.. The current value of the position is $1,482,632 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 56,589 56,589 1,614 0.0007
2025-11-14 2025-09-30 13F ATRICURE COM 04963C209 0 -7,776 -100.00 0 -100.00
2025-08-14 2025-06-30 13F ATRICURE COM 04963C209 7,776 -17,579 -69.33 255 -68.91 0.0002
2025-05-15 2025-03-31 13F ATRICURE COM 04963C209 25,355 -42,107 -62.42 818 -60.36 0.0007
2025-02-14 2024-12-31 13F ATRICURE COM 04963C209 67,462 -49,834 -42.49 2,062 -37.32 0.0015
2024-11-14 2024-09-30 13F ATRICURE COM 04963C209 117,296 11,711 11.09 3,289 36.77 0.0028
2024-08-14 2024-06-30 13F ATRICURE COM 04963C209 105,585 -49,610 -31.97 2,404 -49.08 0.0022
2024-05-15 2024-03-31 13F ATRICURE COM 04963C209 155,195 46,179 42.36 4,721 21.36 0.0040
2024-02-14 2023-12-31 13F ATRICURE COM 04963C209 109,016 37,266 51.94 3,891 23.81 0.0034
2023-11-14 2023-09-30 13F ATRICURE COM 04963C209 71,750 -80,249 -52.80 3,143 -58.12 0.0033
2023-08-14 2023-06-30 13F ATRICURE COM 04963C209 151,999 -26,828 -15.00 7,503 1.21 0.0077
2023-05-15 2023-03-31 13F ATRICURE COM 04963C209 178,827 62,764 54.08 7,412 43.92 0.0079
2023-02-14 2022-12-31 13F ATRICURE COM 04963C209 116,063 -77,394 -40.01 5,151 -31.92 0.0057
2022-11-14 2022-09-30 13F ATRICURE COM 04963C209 193,457 -20,533 -9.60 7,565 -13.47 0.0090
2022-08-15 2022-06-30 13F ATRICURE COM 04963C209 213,990 119,314 126.02 8,743 40.61 0.0102
2022-05-16 2022-03-31 13F ATRICURE COM 04963C209 94,676 52,251 123.16 6,218 110.78 0.0058
2022-02-14 2021-12-31 13F ATRICURE COM 04963C209 42,425 12,677 42.61 2,950 42.58 0.0024
2021-11-15 2021-09-30 13F ATRICURE COM 04963C209 29,748 7,628 34.48 2,069 17.89 0.0019
2021-08-16 2021-06-30 13F ATRICURE COM 04963C209 22,120 -13,180 -37.34 1,755 -24.12 0.0015
2021-05-17 2021-03-31 13F ATRICURE COM 04963C209 35,300 -95,773 -73.07 2,313 -68.30 0.0022
2021-02-16 2020-12-31 13F ATRICURE COM 04963C209 131,073 -120,741 -47.95 7,297 -27.37 0.0065
2020-11-16 2020-09-30 13F ATRICURE COM 04963C209 251,814 -126,540 -33.44 10,047 -40.92 0.0103
2020-08-14 2020-06-30 13F ATRICURE COM 04963C209 378,354 200,021 112.16 17,007 183.92 0.0203
2020-05-15 2020-03-31 13F ATRICURE COM 04963C209 178,333 58,564 48.90 5,990 53.87 0.0093
2020-02-14 2019-12-31 13F ATRICURE COM 04963C209 119,769 18,294 18.03 3,893 53.81 0.0045
2019-11-14 2019-09-30 13F ATRICURE COM 04963C209 101,475 -88,278 -46.52 2,531 -55.30 0.0031
2019-08-14 2019-06-30 13F ATRICURE COM 04963C209 189,753 -110,456 -36.79 5,662 -29.60 0.0071
2019-05-15 2019-03-31 13F ATRICURE COM 04963C209 300,209 29,294 10.81 8,043 -2.98 0.0104
2019-02-14 2018-12-31 13F ATRICURE COM 04963C209 270,915 96,176 55.04 8,290 35.44 0.0114
2018-11-14 2018-09-30 13F ATRICURE COM 04963C209 174,739 -39,559 -18.46 6,121 5.61 0.0074
2018-08-14 2018-06-30 13F ATRICURE COM 04963C209 214,298 21,225 10.99 5,796 46.29 0.0076
2018-05-15 2018-03-31 13F ATRICURE COM 04963C209 193,073 39,546 25.76 3,962 41.50 0.0054
2018-02-14 2017-12-31 13F ATRICURE COM 04963C209 153,527 41,844 37.47 2,800 12.09 0.0039
2017-11-14 2017-09-30 13F ATRICURE COM 04963C209 111,683 27,743 33.05 2,498 22.69 0.0038
2017-08-14 2017-06-30 13F ATRICURE COM 04963C209 83,940 54,308 183.27 2,036 259.08 0.0034
2017-05-15 2017-03-31 13F ATRICURE COM 04963C209 29,632 -103,363 -77.72 567 -78.22 0.0010
2017-02-14 2016-12-31 13F ATRICURE COM 04963C209 132,995 44,462 50.22 2,603 85.93 0.0044
2016-11-14 2016-09-30 13F ATRICURE COM 04963C209 88,533 22,558 34.19 1,400 50.21 0.0025
2016-08-15 2016-06-30 13F ATRICURE COM 04963C209 65,975 1,314 2.03 932 -14.34 0.0017
2016-05-16 2016-03-31 13F ATRICURE COM 04963C209 64,661 33,664 108.60 1,088 56.32 0.0020
2016-02-16 2015-12-31 13F ATRICURE COM 04963C209 30,997 -25,211 -44.85 696 -43.51 0.0010
2015-11-16 2015-09-30 13F ATRICURE COM 04963C209 56,208 47,866 573.80 1,232 498.06 0.0018
2015-08-14 2015-06-30 13F ATRICURE COM 04963C209 8,342 -4,305 -34.04 206 -20.46 0.0003
2015-05-15 2015-03-31 13F ATRICURE COM 04963C209 12,647 -43,334 -77.41 259 -76.81 0.0004
2015-02-17 2014-12-31 13F ATRICURE COM 04963C209 55,981 15,992 39.99 1,117 89.64 0.0014
2014-11-14 2014-09-30 13F ATRICURE COM 04963C209 39,989 -9,382 -19.00 589 -35.06 0.0008
2014-08-14 2014-06-30 13F ATRICURE COM 04963C209 49,371 -26,068 -34.56 907 -36.08 0.0012
2014-05-15 2014-03-31 13F ATRICURE COM 04963C209 75,439 38,969 106.85 1,419 108.37 0.0020
2014-02-14 2013-12-31 13F ATRICURE COM 04963C209 36,470 -239 -0.65 681 68.98 0.0009
2013-11-20 2013-09-30 13F/A-1 ATRICURE COM 04963C209 36,709 11,747 47.06 403 70.04 0.0006
2013-11-14 2013-09-30 13F ATRICURE COM 04963C209 36,709 403
2013-08-14 2013-06-30 13F ATRICURE COM 04963C209 24,962 24,962 237 0.0004
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.