Accuray Incorporated
US ˙ NasdaqGS ˙ US0043971052

SecurityARAY / Accuray Incorporated
InstitutionD. E. Shaw & Co., Inc.
ManagerDE Shaw
Latest Disclosed Ownership843,646 shares
Latest Disclosed Value $ 327,419
D. E. Shaw & Co., Inc. reports 49.88% decrease in ownership of ARAY / Accuray Incorporated

On May 15, 2026 - D. E. Shaw & Co., Inc. filed a 13F-HR form disclosing ownership of 843,646 shares of Accuray Incorporated (US:ARAY) valued at $327,419 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,683,269 shares of Accuray Incorporated. This represents a change in shares of -49.88% during the quarter. The current value of the position is $311,812 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 ACCURAY INC DEL COM 004397105 843,646 -839,623 -49.88 327 -76.44 0.0002
2026-02-17 2025-12-31 13F ACCURAY COM 004397105 1,683,269 -110,122 -6.14 1,388 -53.64 0.0008
2025-11-14 2025-09-30 13F ACCURAY COM 004397105 1,793,391 0 0.00 2,995 21.91 0.0017
2025-08-14 2025-06-30 13F ACCURAY COM 004397105 1,793,391 0 0.00 2,457 -23.49 0.0017
2025-05-15 2025-03-31 13F ACCURAY COM 004397105 1,793,391 0 0.00 3,210 -9.58 0.0029
2025-02-14 2024-12-31 13F ACCURAY COM 004397105 1,793,391 91,529 5.38 3,551 15.90 0.0026
2024-11-14 2024-09-30 13F ACCURAY COM 004397105 1,701,862 216,967 14.61 3,063 13.36 0.0026
2024-08-14 2024-06-30 13F ACCURAY COM 004397105 1,484,895 -136,913 -8.44 2,703 -32.53 0.0025
2024-05-15 2024-03-31 13F ACCURAY COM 004397105 1,621,808 -293,777 -15.34 4,006 -26.12 0.0034
2024-02-14 2023-12-31 13F ACCURAY COM 004397105 1,915,585 -533,116 -21.77 5,421 -18.60 0.0047
2023-11-14 2023-09-30 13F ACCURAY COM 004397105 2,448,701 -278,545 -10.21 6,660 -36.90 0.0070
2023-08-14 2023-06-30 13F ACCURAY COM 004397105 2,727,246 124,017 4.76 10,554 36.52 0.0108
2023-05-15 2023-03-31 13F ACCURAY COM 004397105 2,603,229 138,812 5.63 7,732 50.12 0.0083
2023-02-14 2022-12-31 13F ACCURAY COM 004397105 2,464,417 -47,523 -1.89 5,151 -1.42 0.0057
2022-11-14 2022-09-30 13F ACCURAY COM 004397105 2,511,940 -59,624 -2.32 5,224 3.65 0.0062
2022-08-15 2022-06-30 13F ACCURAY COM 004397105 2,571,564 -221,792 -7.94 5,040 -45.49 0.0059
2022-05-16 2022-03-31 13F ACCURAY COM 004397105 2,793,356 9,918 0.36 9,246 -30.36 0.0087
2022-02-14 2021-12-31 13F ACCURAY COM 004397105 2,783,438 -68,001 -2.38 13,277 17.88 0.0110
2021-11-15 2021-09-30 13F ACCURAY COM 004397105 2,851,439 384,388 15.58 11,263 1.00 0.0102
2021-08-16 2021-06-30 13F ACCURAY COM 004397105 2,467,051 338,779 15.92 11,151 5.85 0.0096
2021-05-17 2021-03-31 13F ACCURAY COM 004397105 2,128,272 -581,403 -21.46 10,535 -6.76 0.0102
2021-02-16 2020-12-31 13F ACCURAY COM 004397105 2,709,675 75,227 2.86 11,299 78.70 0.0101
2020-11-16 2020-09-30 13F ACCURAY COM 004397105 2,634,448 52,137 2.02 6,323 20.62 0.0065
2020-08-14 2020-06-30 13F ACCURAY COM 004397105 2,582,311 -116,527 -4.32 5,242 2.24 0.0062
2020-05-15 2020-03-31 13F ACCURAY COM 004397105 2,698,838 -521,188 -16.19 5,127 -43.54 0.0080
2020-02-14 2019-12-31 13F ACCURAY COM 004397105 3,220,026 2,324 0.07 9,080 1.87 0.0104
2019-11-14 2019-09-30 13F ACCURAY COM 004397105 3,217,702 461,777 16.76 8,913 -16.43 0.0110
2019-08-14 2019-06-30 13F ACCURAY COM 004397105 2,755,925 384,714 16.22 10,665 -5.71 0.0133
2019-05-15 2019-03-31 13F ACCURAY COM 004397105 2,371,211 355,715 17.65 11,311 64.57 0.0146
2019-02-14 2018-12-31 13F ACCURAY COM 004397105 2,015,496 741,493 58.20 6,873 19.88 0.0095
2018-11-14 2018-09-30 13F ACCURAY COM 004397105 1,274,003 181,906 16.66 5,733 28.05 0.0069
2018-08-14 2018-06-30 13F ACCURAY COM 004397105 1,092,097 65,083 6.34 4,477 -12.81 0.0058
2018-05-15 2018-03-31 13F ACCURAY COM 004397105 1,027,014 -318,338 -23.66 5,135 -11.24 0.0070
2018-02-14 2017-12-31 13F ACCURAY COM 004397105 1,345,352 -22,655 -1.66 5,785 5.72 0.0080
2017-11-14 2017-09-30 13F ACCURAY COM 004397105 1,368,007 31,254 2.34 5,472 -13.81 0.0084
2017-08-14 2017-06-30 13F ACCURAY COM 004397105 1,336,753 -15,132 -1.12 6,349 -1.12 0.0105
2017-05-15 2017-03-31 13F ACCURAY COM 004397105 1,351,885 90,989 7.22 6,421 10.71 0.0113
2017-02-14 2016-12-31 13F ACCURAY COM 004397105 1,260,896 -46,034 -3.52 5,800 -30.33 0.0099
2016-11-14 2016-09-30 13F ACCURAY COM 004397105 1,306,930 -80,039 -5.77 8,325 15.64 0.0147
2016-08-15 2016-06-30 13F ACCURAY COM 004397105 1,386,969 -37,470 -2.63 7,199 -12.56 0.0133
2016-05-16 2016-03-31 13F ACCURAY COM 004397105 1,424,439 -211,312 -12.92 8,233 -25.43 0.0148
2016-02-16 2015-12-31 13F ACCURAY COM 004397105 1,635,751 -298,249 -15.42 11,041 14.30 0.0164
2015-11-16 2015-09-30 13F ACCURAY COM 004397105 1,934,000 48,386 2.57 9,660 -23.99 0.0142
2015-08-14 2015-06-30 13F ACCURAY COM 004397105 1,885,614 452,599 31.58 12,709 -4.64 0.0189
2015-05-15 2015-03-31 13F ACCURAY COM 004397105 1,433,015 316,275 28.32 13,327 58.05 0.0204
2015-02-17 2014-12-31 13F ACCURAY COM 004397105 1,116,740 279,072 33.32 8,432 38.66 0.0108
2014-11-14 2014-09-30 13F ACCURAY COM 004397105 837,668 423,278 102.14 6,081 66.74 0.0079
2014-08-14 2014-06-30 13F ACCURAY COM 004397105 414,390 330,552 394.27 3,647 353.04 0.0050
2014-05-15 2014-03-31 13F ACCURAY COM 004397105 83,838 -11,057 -11.65 805 -2.54 0.0011
2014-02-14 2013-12-31 13F ACCURAY COM 004397105 94,895 -179,836 -65.46 826 -59.31 0.0011
2013-11-20 2013-09-30 13F/A-1 ACCURAY COM 004397105 274,731 150,953 121.95 2,030 185.92 0.0032
2013-11-14 2013-09-30 13F ACCURAY COM 004397105 274,731 2,030
2013-08-14 2013-06-30 13F ACCURAY COM 004397105 123,778 123,778 710 0.0013
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.