Prothena owner Scully receives 566,444-share gift

Indirect positions included 529,000 shares held by his spouse and 187,000 held by Manatee Equity Fund LLC.

Rhea-AI Filing Summary

William P. Scully, a ten percent owner of Prothena Corp Public Ltd Co (PRTA), acquired 566,444 ordinary shares in a bona fide gift transfer on October 27, 2026. His direct holdings afterward were 1,753,444 ordinary shares. The ordinary shares have a par value of $0.01 per share.

Insider Trade Summary

566,444 shares gifted

Gift 3 txns

Insider SCULLY WILLIAM P

Role 10% Owner

Type	Security	Shares	Price	Value
Gift	Ordinary Shares, par value $0.01 per share	566,444	$0.00	$0.00
holding	Ordinary Shares, par value $0.01 per share	--	--	--
holding	Ordinary Shares, par value $0.01 per share F1	--	--	--

Holdings After Transaction: Ordinary Shares, par value $0.01 per share — 1,753,444 shares (Direct); Ordinary Shares, par value $0.01 per share — 529,000 shares (Indirect, By Spouse); Ordinary Shares, par value $0.01 per share — 187,000 shares (Indirect, By Manatee Equity Fund LLC)

Footnotes (1)

1. F1. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.

Key Figures

Ordinary shares acquired by gift: 566,444 shares Direct holdings after transaction: 1,753,444 shares Shares held by spouse: 529,000 shares +1 more

4 metrics

Ordinary shares acquired by gift 566,444 shares October 27, 2026

Direct holdings after transaction 1,753,444 shares As of October 27, 2026

Shares held by spouse 529,000 shares Indirect holding as of October 27, 2026

Shares held by Manatee Equity Fund LLC 187,000 shares Indirect holding as of October 27, 2026; beneficial ownership disclaimed except to the extent of Scully's pecuniary interest

Key Terms

bona fide gift, beneficial ownership, pecuniary interest

3 terms

bona fide gift financial

"the transfer of 566,444 shares"

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.

beneficial ownership regulatory

"disclaims beneficial ownership of these securities"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"except to the extent of his pecuniary interest therein"

FAQ

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

How many PRTA shares did William P. Scully acquire as a gift?

William P. Scully acquired 566,444 ordinary shares through a bona fide gift transfer on October 27, 2026. His direct holdings afterward were 1,753,444 ordinary shares.

What indirect PRTA shareholdings are listed for William P. Scully?

The listed indirect holdings were 529,000 ordinary shares held by his spouse and 187,000 ordinary shares held by Manatee Equity Fund LLC, each as of October 27, 2026. Scully disclaims beneficial ownership of the fund-held shares except to the extent of his pecuniary interest.

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

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Available on EDGAR 10/29/2026 - 02:04 PM EDT Accepted by SEC EDGAR 10/29/2026 - 02:03 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED 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)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/27/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares, par value $0.01 per share	10/27/2026		G	V	566,444	A	$0	1,753,444	D
Ordinary Shares, par value $0.01 per share								529,000	I	By Spouse
Ordinary Shares, par value $0.01 per share								187,000	I	By Manatee Equity Fund LLC(1)

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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount 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. Scully	10/29/2026
	** Signature of Reporting Person	Date
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)