AtriCure, Inc.
US ˙ NasdaqGM ˙ US04963C2098

SecurityATRC / AtriCure, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership4,521 shares
Latest Disclosed Value $ 128,984
Citigroup Inc reports 225.72% increase in ownership of ATRC / AtriCure, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 4,521 shares of AtriCure, Inc. (US:ATRC) valued at $128,984 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,388 shares of AtriCure, Inc.. This represents a change in shares of 225.72% during the quarter. The current value of the position is $123,288 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 4,521 3,133 225.72 129 137.04 0.0001
2026-02-13 2025-12-31 13F ATRICURE COM 04963C209 1,388 -55,697 -97.57 55 -97.32 0.0000
2025-11-10 2025-09-30 13F ATRICURE COM 04963C209 57,085 36,839 181.96 2,012 203.47 0.0009
2025-08-11 2025-06-30 13F ATRICURE COM 04963C209 20,246 -15,908 -44.00 663 -43.14 0.0003
2025-05-12 2025-03-31 13F ATRICURE COM 04963C209 36,154 -3,723 -9.34 1,166 -4.27 0.0006
2025-02-12 2024-12-31 13F ATRICURE COM 04963C209 39,877 5,432 15.77 1,219 26.22 0.0007
2024-11-12 2024-09-30 13F ATRICURE COM 04963C209 34,445 2,329 7.25 966 32.01 0.0006
2024-08-12 2024-06-30 13F ATRICURE COM 04963C209 32,116 18,631 138.16 731 78.29 0.0005
2024-05-10 2024-03-31 13F ATRICURE COM 04963C209 13,485 4,451 49.27 410 27.33 0.0003
2024-02-09 2023-12-31 13F ATRICURE COM 04963C209 9,034 6,339 235.21 322 172.88 0.0002
2023-12-06 2023-09-30 13F/A-1 ATRICURE COM 04963C209 2,695 -18,820 -87.47 118 -88.88 0.0001
2023-11-09 2023-09-30 13F ATRICURE COM 04963C209 2,695 -18,820 118 0.0001
2023-08-10 2023-06-30 13F ATRICURE COM 04963C209 21,515 16,733 349.92 1,062 435.86 0.0007
2023-05-11 2023-03-31 13F ATRICURE COM 04963C209 4,782 1,282 36.63 198 27.74 0.0001
2023-02-09 2022-12-31 13F ATRICURE COM 04963C209 3,500 -1,259 -26.46 155 -16.67 0.0001
2022-11-10 2022-09-30 13F ATRICURE COM 04963C209 4,759 -2,465 -34.12 186 -36.95 0.0001
2022-08-10 2022-06-30 13F ATRICURE COM 04963C209 7,224 1,520 26.65 295 -21.12 0.0002
2022-05-12 2022-03-31 13F ATRICURE COM 04963C209 5,704 -10,175 -64.08 374 -66.12 0.0002
2022-02-10 2021-12-31 13F ATRICURE COM 04963C209 15,879 6,838 75.63 1,104 75.52 0.0006
2021-11-10 2021-09-30 13F ATRICURE COM 04963C209 9,041 2,741 43.51 629 25.80 0.0004
2021-08-10 2021-06-30 13F ATRICURE COM 04963C209 6,300 -163 -2.52 500 18.20 0.0003
2021-05-13 2021-03-31 13F ATRICURE COM 04963C209 6,463 -5,468 -45.83 423 -36.30 0.0003
2021-02-11 2020-12-31 13F ATRICURE COM 04963C209 11,931 5,397 82.60 664 154.41 0.0004
2020-11-12 2020-09-30 13F ATRICURE COM 04963C209 6,534 -22,908 -77.81 261 -80.27 0.0002
2020-08-12 2020-06-30 13F ATRICURE COM 04963C209 29,442 18,400 166.64 1,323 256.60 0.0010
2020-05-12 2020-03-31 13F ATRICURE COM 04963C209 11,042 3,230 41.35 371 46.06 0.0003
2020-02-12 2019-12-31 13F ATRICURE COM 04963C209 7,812 -4,175 -34.83 254 -15.05 0.0002
2019-11-08 2019-09-30 13F ATRICURE COM 04963C209 11,987 -499 -4.00 299 -19.84 0.0002
2019-08-12 2019-06-30 13F ATRICURE COM 04963C209 12,486 306 2.51 373 14.42 0.0003
2019-05-13 2019-03-31 13F ATRICURE COM 04963C209 12,180 1,138 10.31 326 -3.55 0.0003
2019-02-12 2018-12-31 13F ATRICURE COM 04963C209 11,042 2,094 23.40 338 7.64 0.0003
2018-11-13 2018-09-30 13F ATRICURE COM 04963C209 8,948 4,414 97.35 314 155.28 0.0003
2018-08-10 2018-06-30 13F ATRICURE COM 04963C209 4,534 516 12.84 123 50.00 0.0001
2018-05-11 2018-03-31 13F ATRICURE COM 04963C209 4,018 700 21.10 82 34.43 0.0001
2018-02-12 2017-12-31 13F ATRICURE COM 04963C209 3,318 3,218 3,218.00 61 2,950.00 0.0000
2017-11-13 2017-09-30 13F ATRICURE COM 04963C209 100 -111 -52.61 2 -60.00 0.0000
2017-08-11 2017-06-30 13F ATRICURE COM 04963C209 211 -1,019 -82.85 5 -79.17 0.0000
2017-05-12 2017-03-31 13F ATRICURE COM 04963C209 1,230 -26,149 -95.51 24 -95.52 0.0000
2017-02-10 2016-12-31 13F ATRICURE COM 04963C209 27,379 24,254 776.13 536 993.88 0.0005
2016-11-10 2016-09-30 13F ATRICURE COM 04963C209 3,125 806 34.76 49 53.13 0.0000
2016-08-12 2016-06-30 13F ATRICURE COM 04963C209 2,319 -17,554 -88.33 32 -90.42 0.0000
2016-05-13 2016-03-31 13F ATRICURE COM 04963C209 19,873 18,576 1,432.23 334 1,051.72 0.0004
2016-02-12 2015-12-31 13F ATRICURE COM 04963C209 1,297 1,292 25,840.00 29 0.0000
2015-11-13 2015-09-30 13F ATRICURE COM 04963C209 5 -428 -98.85 0 -100.00
2015-08-13 2015-06-30 13F ATRICURE COM 04963C209 433 -2,060 -82.63 11 -78.43 0.0000
2015-05-14 2015-03-31 13F ATRICURE COM 04963C209 2,493 -3,201 -56.22 51 -55.26 0.0000
2015-02-17 2014-12-31 13F ATRICURE COM 04963C209 5,694 2,841 99.58 114 171.43 0.0001
2014-11-14 2014-09-30 13F ATRICURE COM 04963C209 2,853 222 8.44 42 -12.50 0.0000
2014-08-14 2014-06-30 13F ATRICURE COM 04963C209 2,631 -6,503 -71.20 48 -72.09 0.0000
2014-05-15 2014-03-31 13F ATRICURE COM 04963C209 9,134 2,434 36.33 172 37.60 0.0002
2014-02-14 2013-12-31 13F ATRICURE COM 04963C209 6,700 6,028 897.02 125 1,685.71 0.0001
2013-11-14 2013-09-30 13F ATRICURE COM 04963C209 672 620 1,192.31 7 0.0000
2013-08-14 2013-06-30 13F ATRICURE COM 04963C209 52 52 0 0.0000
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.