Andrea Bernatova - 29 Oct 2025 Form 3 Insider Report for Dynamix Corp III (DNMXU)

Role: CEO and Chairman, Director, 10%+ Owner
Signature: /s/ Gerry Spedale as attorney-in-fact
Issuer symbol: DNMXU
Transactions as of: 29 Oct 2025
Net transactions value: $0
Form type: 3
Filing time: 29 Oct 2025, 20:17:49 UTC
Previous filing: 20 Nov 2024
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Bernatova Andrea	CEO and Chairman, Director, 10%+ Owner	C/O DYNAMIX CORPORATION III, 1980 POST OAK BLVD., SUITE 100 PMB 6373, HOUSTON,	/s/ Gerry Spedale as attorney-in-fact	29 Oct 2025	0001625618

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	DNMXU	Class B ordinary shares, par value $0.0001							29 Oct 2025	Class A ordinary shares, par value $0.0001	6,708,333		See Footnote	F1, F2, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	As described in the registration statement on Form S-1 (File No. 333-289517) of Dynamix Corporation III (the "Issuer") under the heading "Description of Securities--Founder Shares," the Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination, or at any time prior to the Issuer's initial business combination, at the option of the holder, on a one-for-one basis, subject to certain adjustments. The Class B ordinary shares have no expiration date.
F2	Represents 6,708,333 Class B ordinary shares held by DynamixCore Holdings III, LLC (the "Sponsor"). The reporting person is the managing member of the Sponsor. Accordingly, the reporting person may be deemed to have beneficial ownership of the Class B ordinary shares held directly by the Sponsor.
F3	Includes 875,000 Class B ordinary shares that are subject to forfeiture depending on the extent to which the underwriters' over-allotment option is exercised in connection with the Issuer's initial public offering of Class A ordinary shares. The reporting person disclaims beneficial ownership of all of the securities that are or may be beneficially owned by the Sponsor or any of its affiliates except to the extent of her pecuniary interest therein. Pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), this filing shall not be deemed an admission that the reporting person is, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owner of any equity securities of the Issuer for purposes of Section 16 of the Exchange Act or otherwise.

Remarks:

See Exhibit 24 - Power of Attorney