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Barinthus director converts 3,000 shares in merger

Director’s Barinthus options and 3,000 ordinary shares were converted into equity of the new parent company at a 0.111-for-1 exchange ratio.

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Barinthus Biotherapeutics plc. (symbol: BRNS) is the issuer of record for a Form 4 filing submitted to the SEC. Hammacher Alex reported disposition transactions in this Form 4 filing.

Barinthus Biotherapeutics plc (BRNS) reports that director Alex Hammacher’s Barinthus equity awards and shares were restructured on September 9, 2026 in connection with the completion of a merger under an Agreement and Plan of Merger. Several option grants over Barinthus ordinary shares ceased to be rights over Barinthus stock and were converted into options over common stock of the new parent company, while 3,000 Barinthus ordinary shares were exchanged, with each Barinthus share converted into the right to receive 0.111 share of the parent’s common stock.

Positive

  • None.

Negative

  • None.
Insider Hammacher Alex
Role Director
Type Security Shares Price Value
Disposition Share Option (Right to Buy) F2, F4, F1 34,328 $0.00 $0.00
Disposition Share Option (Right to Buy) F2, F4, F1 18,604 $0.00 $0.00
Disposition Share Option (Right to Buy) F2, F4, F1 19,197 $0.00 $0.00
Disposition Share Option (Right to Buy) F2, F4, F1 19,516 $0.00 $0.00
Disposition Share Option (Right to Buy) F2, F4, F1 20,174 $0.00 $0.00
Disposition Ordinary Shares F1, F2, F3 3,000 -- --
Holdings After Transaction: Share Option (Right to Buy) — 0 contracts (Direct); Ordinary Shares — 0 shares (Direct)
Footnotes (4)
  1. F1. The Ordinary Shares may be represented by American Depositary Shares ("ADSs" and together with the Ordinary Shares, the "Shares"), each of which currently represents one Ordinary Share.
  2. F2. This Form 4 reports securities transacted in connection with the Agreement and Plan of Merger, dated September 29, 2025, as amended (the "Merger Agreement") by and among the Issuer, Beacon Topco, Inc. ("Topco"), a Delaware corporation and a direct wholly owned subsidiary of the Issuer, Cdog Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Topco, and Clywedog Therapeutics, Inc., a Delaware corporation. On September 9, 2026 (the "Effective Time"), in connection with the effectiveness of the scheme of arrangement under Part 26 of the United Kingdom Companies Act 2006 (the "Scheme") contemplated by the Merger Agreement, Topco acquired the entire issued share capital of the Issuer, resulting in the Issuer becoming a direct wholly owned subsidiary of Topco.
  3. F3. Pursuant to the Merger Agreement and in connection with the effectiveness of the Scheme, at the Effective Time, each Share of the Issuer was converted into the right to receive 0.111 shares of common stock, $0.0001 par value per share, of Topco (the "Topco Common Stock").
  4. F4. Pursuant to the Merger Agreement, at the Effective Time, each option to acquire Shares under the Issuer's equity plans that was outstanding as of immediately prior to the Effective Time ceased to represent a right to acquire Shares of the Issuer, and was converted into an option to acquire shares of Topco Common Stock and assumed by Topco on the same terms and conditions (including applicable vesting and exercisability conditions) as were applicable to such option immediately prior to the Effective Time.
Ordinary shares disposed 3,000 shares Barinthus ordinary shares converted at the effective time on September 9, 2026
Exchange ratio for Barinthus shares 0.111 share of parent common stock per Barinthus share Conversion of each Barinthus share into the right to receive shares of the new parent company
Option grant over Barinthus shares (highest exercise price) 34,328 options at $17.00 per share Share options that ceased to be rights over Barinthus shares and were converted into options over parent company common stock; expiration May 1, 2031
Option grant over Barinthus shares (later expiration) 20,174 options at $1.00 per share Share options converted into options over parent company common stock; expiration June 10, 2035
Additional option grants converted 18,604; 19,197; 19,516 options Further Barinthus share options at exercise prices of $4.27, $2.27 and $2.34 per share, respectively, all converted into options over parent company common stock
ADS to ordinary share ratio 1 ADS per 1 ordinary share Each American Depositary Share represents one Barinthus ordinary share prior to the merger-related conversions
Agreement and Plan of Merger regulatory
"This Form 4 reports securities transacted in connection with the Agreement and Plan of Merger, dated September 29, 2025"
An Agreement and Plan of Merger is a formal document where two companies agree to combine into one, outlining how the process will happen. It’s like a step-by-step plan for merging, and it matters because it shows both sides have agreed on the details before the official transition takes place.
scheme of arrangement regulatory
"in connection with the effectiveness of the scheme of arrangement under Part 26 of the United Kingdom Companies Act 2006"
A scheme of arrangement is a legal agreement between a company and its shareholders or creditors to reorganize or settle debts, often to avoid bankruptcy or make big changes. It’s like a carefully planned handshake that everyone agrees to, helping the company stay afloat or improve its financial health.
Effective Time regulatory
"On September 9, 2026 (the "Effective Time"), in connection with the effectiveness of the scheme of arrangement"
The exact clock time when a regulatory filing, approval, or corporate action formally becomes legally active; from that moment the change is binding and can be acted on. Investors care because the effective time marks when ownership, rights, trading rules, or new securities take effect — like a light switch turning on a contract or transaction — which determines when risks, benefits and market reactions begin.
Topco Common Stock financial
"each Share of the Issuer was converted into the right to receive 0.111 shares of common stock, $0.0001 par value per share, of Topco (the "Topco Common Stock")"
American Depositary Shares financial
"The Ordinary Shares may be represented by American Depositary Shares ("ADSs" and together with the Ordinary Shares, the "Shares")"
American depositary shares (ADSs) are a way for investors in the United States to buy shares of foreign companies without dealing with international markets directly. They represent ownership in a foreign company's stock and are traded on U.S. stock exchanges, making it easier for American investors to buy, sell, and own parts of companies from around the world.

FAQ

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

What did the BRNS Form 4 report for director Alex Hammacher?

It reported that Alex Hammacher’s Barinthus share options and 3,000 ordinary shares were treated as dispositions to Barinthus and converted in connection with a merger, becoming rights to receive common stock of the new parent company under the merger agreement.

How many Barinthus ordinary shares did Alex Hammacher dispose of in this BRNS filing?

The filing shows a disposition of 3,000 Barinthus ordinary shares. After this transaction, the Form 4 reports that zero Barinthus ordinary shares were held directly, as those shares were converted into the right to receive stock of the new parent company.

What exchange ratio applied to Barinthus (BRNS) shares in this transaction?

Each Barinthus share was converted into the right to receive 0.111 share of common stock of the new parent company. This ratio applied at the effective time of the scheme of arrangement implemented under United Kingdom law as part of the merger.

How were Alex Hammacher’s Barinthus share options treated in the BRNS Form 4?

Each option to acquire Barinthus shares that was outstanding immediately before the effective time stopped representing a right to acquire Barinthus shares and was converted into an option to acquire common stock of the new parent company on the same vesting and exercisability terms.

Does the BRNS Form 4 indicate trades under a Rule 10b5-1 plan?

No. The Form 4 indicates that the transactions were not reported as being made under a Rule 10b5-1 trading plan. Instead, the changes arose from the effectiveness of the merger and related scheme of arrangement, not from open-market trading activity.

What merger is referenced in the BRNS Form 4 for Alex Hammacher?

The filing references an Agreement and Plan of Merger among Barinthus, a newly formed parent company, and merger subsidiaries. At the effective time on September 9, 2026, the parent company acquired all issued share capital of Barinthus, making Barinthus a direct wholly owned subsidiary.

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

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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
X
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Hammacher Alex

(Last)(First)(Middle)
C/O BARINTHUS BIOTHERAPEUTICS PLC
20400 CENTURY BOULEVARD

(Street)
GERMANTOWN MARYLAND 20874

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Barinthus Biotherapeutics plc. [ BRNS ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
09/09/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Ordinary Shares(1)09/09/2026D(2)3,000(3)D(3)0D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Share Option (Right to Buy)$1709/09/2026D(2)34,328 (4)05/01/2031Ordinary Shares(1)34,328$0.000D
Share Option (Right to Buy)$4.2709/09/2026D(2)18,604 (4)06/15/2032Ordinary Shares(1)18,604$0.000D
Share Option (Right to Buy)$2.2709/09/2026D(2)19,197 (4)05/11/2033Ordinary Shares(1)19,197$0.000D
Share Option (Right to Buy)$2.3409/09/2026D(2)19,516 (4)05/10/2034Ordinary Shares(1)19,516$0.000D
Share Option (Right to Buy)$109/09/2026D(2)20,174 (4)06/10/2035Ordinary Shares(1)20,174$0.000D
Explanation of Responses:
1. The Ordinary Shares may be represented by American Depositary Shares ("ADSs" and together with the Ordinary Shares, the "Shares"), each of which currently represents one Ordinary Share.
2. This Form 4 reports securities transacted in connection with the Agreement and Plan of Merger, dated September 29, 2025, as amended (the "Merger Agreement") by and among the Issuer, Beacon Topco, Inc. ("Topco"), a Delaware corporation and a direct wholly owned subsidiary of the Issuer, Cdog Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Topco, and Clywedog Therapeutics, Inc., a Delaware corporation. On September 9, 2026 (the "Effective Time"), in connection with the effectiveness of the scheme of arrangement under Part 26 of the United Kingdom Companies Act 2006 (the "Scheme") contemplated by the Merger Agreement, Topco acquired the entire issued share capital of the Issuer, resulting in the Issuer becoming a direct wholly owned subsidiary of Topco.
3. Pursuant to the Merger Agreement and in connection with the effectiveness of the Scheme, at the Effective Time, each Share of the Issuer was converted into the right to receive 0.111 shares of common stock, $0.0001 par value per share, of Topco (the "Topco Common Stock").
4. Pursuant to the Merger Agreement, at the Effective Time, each option to acquire Shares under the Issuer's equity plans that was outstanding as of immediately prior to the Effective Time ceased to represent a right to acquire Shares of the Issuer, and was converted into an option to acquire shares of Topco Common Stock and assumed by Topco on the same terms and conditions (including applicable vesting and exercisability conditions) as were applicable to such option immediately prior to the Effective Time.
/s/ William Enright, Attorney-in-Fact09/09/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

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