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Barinthus director exchanges 10,506 shares in merger

Barinthus Biotherapeutics director Pierre A. Morgon reported option and share dispositions tied to a merger that converted Barinthus into a wholly owned subsidiary.

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Barinthus Biotherapeutics plc (BRNS) director Pierre A. Morgon reported several dispositions of securities on September 9, 2026, in connection with the closing of a merger under an Agreement and Plan of Merger. Barinthus became a direct wholly owned subsidiary of a new parent company at the merger’s effective time.

On that date, multiple share options to acquire Barinthus ordinary shares, with exercise prices ranging from $0.0001 to $17.00 per share and expiring between 2030 and 2035, were reported as dispositions to the issuer and converted into options over the parent company’s common stock on the same terms. In addition, 10,506 ordinary shares (which may be held as ADSs) were reported as disposed to the issuer as each Barinthus share was converted into the right to receive 0.111 shares of the parent company’s common stock. No Rule 10b5-1 trading plan is reported.

Positive

  • None.

Negative

  • None.
Insider Morgon Pierre A.
Role Director
Type Security Shares Price Value
Disposition Share Option (Right to Buy) F2, F4, F1 20,394 $0.00 $0.00
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 10,506 -- --
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 10,506 shares Disposition to issuer reported for September 9, 2026, in merger
Share option disposition (exercise price $0.0001) 20,394 options Options expiring January 10, 2030 converted into parent company options
Share option disposition (exercise price $17.00) 34,328 options Options expiring May 1, 2031 converted into parent company options
Share option disposition (exercise price $4.27) 18,604 options Options expiring June 15, 2032 converted into parent company options
Share option disposition (exercise price $2.27) 19,197 options Options expiring May 11, 2033 converted into parent company options
Share option disposition (exercise price $2.34) 19,516 options Options expiring May 10, 2034 converted into parent company options
Share option disposition (exercise price $1.00) 20,174 options Options expiring June 10, 2035 converted into parent company options
Share conversion ratio 0.111 Each Barinthus share converted into 0.111 shares of parent company common stock
Agreement and Plan of Merger regulatory
"reported securities transacted in connection with the Agreement and Plan of Merger"
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"
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.
American Depositary Shares financial
"The Ordinary Shares may be represented by American Depositary 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.
Topco Common Stock financial
"right to receive 0.111 shares of common stock, $0.0001 par value per share, of Topco"
Effective Time regulatory
"On September 9, 2026 (the "Effective Time"), in connection with the effectiveness"
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.

FAQ

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

What did BRNS director Pierre A. Morgon report on this Form 4?

He reported dispositions of multiple share options and 10,506 ordinary shares of Barinthus Biotherapeutics plc on September 9, 2026, all in connection with the completion of a merger in which Barinthus became a direct wholly owned subsidiary of a new parent company.

How were BRNS shares treated in the merger described in the Form 4?

At the effective time of the merger, each Barinthus share was converted into the right to receive 0.111 shares of the parent company’s common stock, $0.0001 par value per share, as provided in the Merger Agreement and related scheme of arrangement.

What happened to the BRNS share options reported by Pierre A. Morgon?

Each option to acquire Barinthus shares that was outstanding immediately before the effective time ceased to represent Barinthus shares and was converted into an option to acquire the parent company’s common stock, on the same terms and conditions, including vesting and exercisability.

How many BRNS ordinary shares did Pierre A. Morgon dispose of?

He reported a disposition to the issuer of 10,506 ordinary shares of Barinthus Biotherapeutics plc on September 9, 2026, in connection with the merger and the related conversion of each Barinthus share into the right to receive parent company common stock.

Were the BRNS securities in this Form 4 represented by ADSs?

The filing states that the ordinary shares may be represented by American Depositary Shares (ADSs), with each ADS currently representing one ordinary share, and refers to the ordinary shares and ADSs together as the “Shares.”

Was a Rule 10b5-1 trading plan involved in these BRNS transactions?

No. The Form 4 indicates that the Rule 10b5-1 checkbox is not marked, and there is no footnote stating that the transactions were executed pursuant to a Rule 10b5-1 or similar pre-arranged trading plan.

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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*
Morgon Pierre A.

(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)10,506(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)$0.000109/09/2026D(2)20,394 (4)01/10/2030Ordinary Shares(1)20,394$0.000D
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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