Dimensional Fund Advisors filed an Amendment No. 5 to Schedule 13G/A reporting beneficial ownership of 315,471 shares of FONAR Corp Common Stock. The filing shows a 5.1% stake and indicates sole voting power for 312,499 shares and sole dispositive power for 315,471 shares. The cover lists an as-of date of 03/31/2026 and the form is signed on 04/09/2026. The filing states these shares are owned by various Funds advised or sub-advised by Dimensional and that Dimensional disclaims beneficial ownership while reporting voting and dispositive powers in its advisory role.
Positive
None.
Negative
None.
Insights
Schedule 13G/A shows a passive institutional holding above 5% for FONAR.
The filing reports 315,471 shares (5.1%) held by Funds advised by Dimensional Fund Advisors with 312,499 sole voting shares. This is a routine disclosure under ownership thresholds, highlighting an institutional position without an assertion of direct beneficial ownership.
Future disclosures will show any material changes in voting or ownership; the form emphasizes advisory relationships and disclaimers common to investment managers.
Key Figures
Beneficially owned:315,471 sharesPercent of class:5.1%Sole voting power:312,499 shares+1 more
4 metrics
Beneficially owned315,471 sharesownership reported as of 03/31/2026
Percent of class5.1%percentage of FONAR Common Stock reported
Sole voting power312,499 sharesnumber with sole voting power reported in filing
Filing signature date04/09/2026Schedule 13G/A signed by Global Chief Compliance Officer
Key Terms
beneficially owned, Sole dispositive power, Section 13(d)
3 terms
beneficially ownedregulatory
"Amount beneficially owned: 315,471 ** see Note 1 **"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
Sole dispositive powerregulatory
"Sole power to dispose or to direct the disposition of: 315,471** see Note 1 **"
Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.
Section 13(d)regulatory
"for any other purposes than Section 13(d) of the Securities Exchange Act"
What does Dimensional Fund Advisors report for FONAR (FONR)?
Dimensional reports beneficial ownership of 315,471 shares, representing 5.1% of FONAR common stock as of 03/31/2026. The filing attributes these shares to Funds advised or sub‑advised by Dimensional.
Does Dimensional claim direct beneficial ownership of the shares?
No. The filing states Dimensional disclaims beneficial ownership and reports the shares as owned by various Funds for which it provides advisory services, while noting its voting and dispositive powers.
How many shares does Dimensional have sole voting power over?
Dimensional reports sole voting power for 312,499 shares and sole dispositive power for 315,471 shares, per the Schedule 13G/A information furnished in the amendment.
What are the relevant dates in this filing for FONAR ownership?
The Schedule 13G/A shows an as-of date of 03/31/2026 for the ownership figures and the form is signed by Dimensional's Global Chief Compliance Officer on 04/09/2026.
Why did Dimensional file an amendment to Schedule 13G?
Amendment filings update prior Schedule 13G disclosures when ownership levels, reporting details, or holdings change; this amendment records the adviser’s reported 315,471-share (5.1%) position as of the stated date.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 5)
FONAR Corp
(Name of Issuer)
Common Stock
(Title of Class of Securities)
344437405
(CUSIP Number)
03/31/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
344437405
1
Names of Reporting Persons
Dimensional Fund Advisors LP
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
312,499.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
315,471.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
315,471.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.1 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
FONAR Corp
(b)
Address of issuer's principal executive offices:
110 Marcus Drive, Melville, NY 11747
Item 2.
(a)
Name of person filing:
Dimensional Fund Advisors LP
(b)
Address or principal business office or, if none, residence:
6300 Bee Cave Road, Building One, Austin, TX 78746
(c)
Citizenship:
Delaware Limited Partnership
(d)
Title of class of securities:
Common Stock
(e)
CUSIP No.:
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
315,471 ** see Note 1 **
** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)
Percent of class:
5.1 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
312,499** see Note 1 **
(ii) Shared power to vote or to direct the vote:
0
(iii) Sole power to dispose or to direct the disposition of:
315,471** see Note 1 **
(iv) Shared power to dispose or to direct the disposition of:
0
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
The Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
