STOCK TITAN

Prothena (PRTA) ten percent owner Scully receives 251,553-share bona fide gift

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Form Type
4

Rhea-AI Filing Summary

SCULLY WILLIAM P reported acquisition or exercise transactions in this Form 4 filing.

Prothena Corp Public Ltd Co reporting person William P. Scully, identified as a ten percent owner, reported receiving a bona fide gift of 251,553 Ordinary Shares of the company on 2026-08-10 at a stated price of $0.00 per share. Following this gift, he directly holds 1,041,553 Ordinary Shares. He also reports indirect holdings of 83,500 shares through Manatee Equity Fund LLC, for which he disclaims beneficial ownership beyond his pecuniary interest, and 52,000 shares held by his spouse.

Positive

  • None.

Negative

  • None.
Insider SCULLY WILLIAM P
Role 10% Owner
Type Security Shares Price Value
Gift Ordinary Shares, par value $0.01 per share 251,553 $0.00 $0.00
holding Ordinary Shares, par value $0.01 per share F1 -- -- --
holding Ordinary Shares, par value $0.01 per share -- -- --
Holdings After Transaction: Ordinary Shares, par value $0.01 per share — 1,041,553 shares (Direct); Ordinary Shares, par value $0.01 per share — 83,500 shares (Indirect, By Manatee Equity Fund LLC); Ordinary Shares, par value $0.01 per share — 52,000 shares (Indirect, By Spouse)
Footnotes (1)
  1. F1. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.
Shares received as gift 251,553 shares Bona fide gift of Ordinary Shares on 2026-08-10
Price per gifted share $0.00 per share Stated transaction price for gifted Ordinary Shares
Direct holdings after transaction 1,041,553 shares Ordinary Shares directly owned following the gift
Indirect holdings via Manatee Equity Fund LLC 83,500 shares Ordinary Shares held indirectly, with beneficial ownership disclaimed except for pecuniary interest
Indirect holdings via spouse 52,000 shares Ordinary Shares held indirectly through spouse
Gifted shares count (summary) 251,553 shares GiftShares in transaction summary for code G bona fide gift
bona fide gift financial
"Transaction code G is described as a bona fide gift"
A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.
ten percent owner regulatory
"The reporting person is identified as a ten percent owner"
pecuniary interest financial
"Disclaims beneficial ownership except to the extent of his pecuniary interest"
indirect ownership financial
"Indirect ownership reported by Manatee Equity Fund LLC and by spouse"

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

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FAQ

What insider transaction did William P. Scully report in Prothena (PRTA)?

William P. Scully reported receiving a bona fide gift of 251,553 Ordinary Shares of Prothena on 2026-08-10 at a stated price of $0.00 per share, increasing his directly held position.

How many Prothena (PRTA) shares does William P. Scully hold after the reported gift?

After the reported gift, William P. Scully directly holds 1,041,553 Ordinary Shares of Prothena and has additional indirect holdings reported through Manatee Equity Fund LLC and his spouse.

What indirect Prothena (PRTA) holdings are associated with William P. Scully?

Indirectly, Scully reports 83,500 shares of Prothena held by Manatee Equity Fund LLC and 52,000 shares held by his spouse, in addition to his directly held shares.

Does William P. Scully claim full beneficial ownership of all reported Prothena (PRTA) indirect shares?

For the 83,500 shares held by Manatee Equity Fund LLC, Scully disclaims beneficial ownership except to the extent of his pecuniary interest, limiting his claimed economic stake in those shares.

Was the Prothena (PRTA) insider transaction under a Rule 10b5-1 plan?

The filing indicates the Rule 10b5-1 checkbox is not selected, so the reported gift of 251,553 shares was not affirmed as executed under a pre-arranged trading plan.
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
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*
SCULLY WILLIAM P

(Last)(First)(Middle)
771 MANATEE COVE

(Street)
VERO BEACH FLORIDA 32963

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
PROTHENA CORP PUBLIC LTD CO [ PRTA ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
DirectorX10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026
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, par value $0.01 per share08/10/2026GV251,553A$01,041,553D
Ordinary Shares, par value $0.01 per share83,500IBy Manatee Equity Fund LLC(1)
Ordinary Shares, par value $0.01 per share52,000IBy Spouse
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
Explanation of Responses:
1. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.
Reid E. Buchanan by POA from William P. Scully08/11/2026
** 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)