FONAR Corporation
US ˙ NasdaqCM ˙ US3444374058
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT

SecurityFONR / FONAR Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership315,471 shares
Ownership 5.10%
Dimensional Fund Advisors Lp ownership in FONR / FONAR Corporation

2026-04-09 - Dimensional Fund Advisors Lp has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 315,471 shares of FONAR Corporation (US:FONR). This represents 5.1 percent ownership of the company. In their previous filing dated 2024-02-09 , Dimensional Fund Advisors Lp had reported owning 394,759 shares, indicating a decrease of -20.09 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-04-09 2026-04-09 13G/A 394,759 315,471 -20.09 5.10 -16.39
2024-02-09 2024-02-09 13G/A 394,616 394,759 0.04 6.10 1.67
2023-02-10 2023-02-10 13G/A 364,741 394,616 8.19 6.00 7.14
2022-02-08 2022-02-08 13G/A 409,157 364,741 -10.86 5.60 -11.11
2021-02-12 2021-02-12 13G/A 374,623 409,157 9.22 6.30 8.43
2020-02-12 2020-02-12 13G 374,623 5.81

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-05-07 2026-03-31 13F FONAR COM NEW 344437405 315,471 -57,846 -15.50 5,855 -15.49 0.0003
2026-02-12 2025-12-31 13F FONAR COM NEW 344437405 373,317 -3,659 -0.97 6,929 22.04 0.0015
2025-11-12 2025-09-30 13F FONAR COM NEW 344437405 376,976 4,413 1.18 5,677 1.87 0.0012
2025-08-12 2025-06-30 13F FONAR COM NEW 344437405 372,563 802 0.22 5,574 7.01 0.0013
2025-05-13 2025-03-31 13F FONAR COM NEW 344437405 371,761 -4,917 -1.31 5,208 -8.66 0.0013
2025-02-13 2024-12-31 13F FONAR COM NEW 344437405 376,678 2,149 0.57 5,703 -5.97 0.0014
2024-11-07 2024-09-30 13F FONAR COM NEW 344437405 374,529 -6,279 -1.65 6,064 -0.46 0.0015
2024-08-09 2024-06-30 13F FONAR COM NEW 344437405 380,808 -15,095 -3.81 6,093 -27.96 0.0016
2024-05-10 2024-03-31 13F FONAR COM NEW 344437405 395,903 1,144 0.29 8,456 9.52 0.0023
2024-02-07 2023-12-31 13F FONAR COM NEW 344437405 394,759 -1,161 -0.29 7,722 26.64 0.0023
2023-11-09 2023-09-30 13F FONAR COM NEW 344437405 395,920 -13,935 -3.40 6,097 -13.00 0.0020
2023-08-09 2023-06-30 13F FONAR COM NEW 344437405 409,855 1,789 0.44 7,008 6.02 0.0022
2023-05-12 2023-03-31 13F FONAR COM NEW 344437405 408,066 13,450 3.41 6,611 110,066.67 0.0022
2023-02-09 2022-12-31 13F FONAR COM NEW 344437405 394,616 6,393 1.65 7 -99.89 0.0020
2022-11-10 2022-09-30 13F FONAR COM NEW 344437405 388,223 -4,484 -1.14 5,494 -7.91 0.0021
2022-08-12 2022-06-30 13F FONAR COM NEW 344437405 392,707 16,221 4.31 5,966 -14.58 0.0021
2022-05-13 2022-03-31 13F FONAR COM 344437405 376,486 11,745 3.22 6,984 27.82 0.0022
2022-02-09 2021-12-31 13F FONAR COM 344437405 364,741 -4,280 -1.16 5,464 -4.22 0.0017
2021-11-12 2021-09-30 13F FONAR COM 344437405 369,021 -34,997 -8.66 5,705 -20.13 0.0018
2021-08-12 2021-06-30 13F FONAR COM 344437405 404,018 4,826 1.21 7,143 -1.09 0.0023
2021-05-14 2021-03-31 13F FONAR COM 344437405 399,192 -9,965 -2.44 7,222 1.68 0.0024
2021-03-08 2020-12-31 13F/A-2 FONAR COM 344437405 409,157 -517 -0.13 7,103 -16.97 0.0026
2021-02-11 2020-12-31 13F FONAR COM 344437405 409,157 -517 7,103 2,565.2261
2020-11-12 2020-09-30 13F FONAR COM 344437405 409,674 2,169 0.53 8,555 -1.76 0.0036
2020-08-13 2020-06-30 13F FONAR COM 344437405 407,505 15,713 4.01 8,708 52.03 0.0038
2020-05-14 2020-03-31 13F FONAR COM 344437405 391,792 17,169 4.58 5,728 -22.34 0.0030
2020-02-14 2019-12-31 13F FONAR COM 344437405 374,623 10,348 2.84 7,376 -2.05 0.0027
2019-11-12 2019-09-30 13F FONAR COM 344437405 364,275 10,532 2.98 7,530 -1.04 0.0029
2019-08-13 2019-06-30 13F FONAR COM 344437405 353,743 22,175 6.69 7,609 12.09 0.0030
2019-08-12 2019-03-31 13F/A-2 FONAR COM 344437405 331,568 19,548 6.26 6,788 7.49 0.0027
2019-05-10 2019-03-31 13F FONAR COM 344437405 331,568 19,548 6,788
2019-02-26 2018-12-31 13F/A-1 FONAR COM 344437405 312,020 19,104 6.52 6,315 -13.42 0.0029
2019-02-13 2018-12-31 13F FONAR COM 344437405 312,020 19,104 6,315
2018-11-13 2018-09-30 13F FONAR COM 344437405 292,916 44,122 17.73 7,294 10.43 0.0028
2018-08-10 2018-06-30 13F FONAR COM 344437405 248,794 46,641 23.07 6,605 9.64 0.0026
2018-05-11 2018-03-31 13F FONAR COM 344437405 202,153 55,962 38.28 6,024 69.21 0.0025
2018-02-12 2017-12-31 13F FONAR COM 344437405 146,191 74,259 103.23 3,560 62.26 0.0015
2017-11-13 2017-09-30 13F FONAR COM 344437405 71,932 48,245 203.68 2,194 233.94 0.0010
2017-08-11 2017-06-30 13F FONAR COM 344437405 23,687 23,687 657 0.0003
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.