DYN: ForDyne B.V. reports share dispositions

DYN: ForDyne B.V. reported dispositions of Common Stock on 03/09/2026 and 03/10/2026 The filing shows sales of 177,690 shares with proceeds of $3,148,986.64 on 03/09/2026 and 511,098 shares with proceeds of $10,000,336.60 on 03/10/2026.

Rhea-AI Filing Summary

DYN: ForDyne B.V. reported dispositions of Common Stock on 03/09/2026 and 03/10/2026

The filing shows sales of 177,690 shares with proceeds of $3,148,986.64 on 03/09/2026 and 511,098 shares with proceeds of $10,000,336.60 on 03/10/2026.

Insights

Insider Transactions Analyst

Two sizable dispositions were reported by ForDyne B.V., totaling listed sales on consecutive dates.

The filing lists a 03/09/2026 sale of 177,690 shares for $3,148,986.64 and a 03/10/2026 sale of 511,098 shares for $10,000,336.60. These entries identify the seller as ForDyne B.V. and show UBS Financial Services Inc. as the brokerage address listed.

Cash‑flow treatment and any remaining holdings are not detailed in the excerpt. Subsequent filings or company disclosures would be required to contextualize impact on ownership or outstanding share counts.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What transactions did ForDyne B.V. report for DYN?

ForDyne B.V. reported two dispositions. The filing lists a sale of 177,690 shares on 03/09/2026 and 511,098 shares on 03/10/2026, with proceeds shown as $3,148,986.64 and $10,000,336.60, respectively.

Who is the broker or intermediary named in the Form 144 for DYN?

UBS Financial Services Inc. is listed with an address at 11 Madison Avenue, 4th Floor, New York, NY on the filing, indicating the brokerage used in the reported transactions in the excerpt.

Are the sales described as part of an IPO conversion for DYN?

The excerpt references an "IPO Conversion of Shares" dated 09/17/2020. The filing shows that conversion language but does not link it explicitly to the two reported dispositions in the excerpt.

Does the filing state who received the proceeds from these sales?

The excerpt lists gross proceeds for each disposition. It shows $3,148,986.64 and $10,000,336.60, but the filing excerpt does not specify who ultimately received the proceeds or how they were used.

Do these Form 144 entries disclose remaining holdings or ownership after the sales?

The provided excerpt does not show post‑transaction holdings. The filing lists each disposition by date, share count, and proceeds but does not include the seller's remaining beneficial ownership figures in the visible text.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/11/2026 - 04:05 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002019392
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Dyne Therapeutics, Inc.
SEC File Number	001-39509
Address of Issuer	1560 TRAPELO ROAD WALTHAM MASSACHUSETTS 02451
Phone	(781) 786-8230
Name of Person for Whose Account the Securities are To Be Sold	ForDyne B.V.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Affiliate

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	UBS Financial Services Inc. 11 Madison Avenue 4th Floor New York NY 10010	807295	15944076.20	165027119	03/11/2026	Nasdaq

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/17/2020	IPO Conversion of Shares	Issuer			807295	09/17/2020	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
ForDyne B.V. c/o 1560 TRAPELO ROAD WALTHAM MA 02451	Common	03/09/2026	177690	3148986.64
ForDyne B.V. c/o 1560 TRAPELO ROAD WALTHAM MA 02451	Common	03/10/2026	511098	10000336.60

144: Remarks and Signature

Remarks
Date of Notice	03/11/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/11/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ UBS Financial Services Inc, as attorney-in-fact for ForDyne B.V.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)