Prothena holder gifts 963K shares of stock

PROTHENA CORP PUBLIC LTD CO (PRTA) reported insider activity by ten percent owner William P. Scully involving bona fide gifts of its ordinary shares.

Rhea-AI Filing Summary

PROTHENA CORP PUBLIC LTD CO (PRTA) reported insider activity by ten percent owner William P. Scully involving bona fide gifts of its ordinary shares. On August 18, 2026, he disposed of 627,553 ordinary shares as a bona fide gift at a reported price of $0.00 per share. On August 17, 2026, he was reported as acquiring 336,000 ordinary shares in a bona fide gift transaction. After these transactions, indirect holdings reported include 83,500 shares held by Manatee Equity Fund LLC, as to which he disclaims beneficial ownership except to the extent of his pecuniary interest, and 52,000 shares held by his spouse.

Insider Trade Summary

963,553 shares gifted

Gift 4 txns

Insider SCULLY WILLIAM P

Role 10% Owner

Type	Security	Shares	Price	Value
Gift	Ordinary Shares, par value $0.01 per share	627,553	$0.00	$0.00
holding	Ordinary Shares, par value $0.01 per share F1	--	--	--
holding	Ordinary Shares, par value $0.01 per share	--	--	--
Gift	Ordinary Shares, par value $0.01 per share	336,000	$0.00	$0.00

Holdings After Transaction: Ordinary Shares, par value $0.01 per share — 750,000 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.

Key Figures

Gifted shares on 2026-08-18: 627,553 shares Gifted shares on 2026-08-17: 336,000 shares Total gifted shares: 963,553 shares +2 more

5 metrics

Gifted shares on 2026-08-18 627,553 shares Bona fide gift disposition of ordinary shares at $0.00 per share

Gifted shares on 2026-08-17 336,000 shares Bona fide gift acquisition of ordinary shares at $0.00 per share

Total gifted shares 963,553 shares Aggregate ordinary shares involved in bona fide gift transactions

Indirect holdings via Manatee Equity Fund LLC 83,500 shares Indirect ownership with beneficial ownership disclaimed except for pecuniary interest

Indirect holdings via spouse 52,000 shares Ordinary shares held indirectly through spouse

Key Terms

bona fide gift, ten percent owner, pecuniary interest

3 terms

bona fide gift financial

"transaction_code_description": "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 financial

""is_ten_percent_owner": 1"

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.

What insider transactions did William P. Scully report for PRTA on this Form 4?

William P. Scully reported two bona fide gift transactions in Prothena (PRTA) ordinary shares, totaling 963,553 shares on August 17–18, 2026, plus updated indirect holdings through an investment fund and his spouse.

How many PRTA shares did William P. Scully gift on August 18, 2026?

On August 18, 2026, William P. Scully reported a bona fide gift disposition of 627,553 Prothena (PRTA) ordinary shares at a reported price of $0.00 per share, characterized as a gift transfer rather than a market sale.

What PRTA share transaction did William P. Scully report on August 17, 2026?

On August 17, 2026, William P. Scully reported a bona fide gift transaction acquiring 336,000 Prothena (PRTA) ordinary shares. The transaction is coded as a gift transfer with a reported price of $0.00 per share, reflecting non-market consideration.

What are William P. Scully’s indirect PRTA holdings after these transactions?

After the reported transactions, indirect holdings include 83,500 Prothena (PRTA) shares held by Manatee Equity Fund LLC and 52,000 shares held by his spouse. For the Manatee position, he disclaims beneficial ownership except for his pecuniary interest.

Were the reported PRTA transactions by William P. Scully sales or gifts?

The Form 4 characterizes both reported PRTA transactions as bona fide gifts, coded with transaction code G. They involve gift transfers at a reported per-share price of $0.00, not open-market sales or purchases.

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

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Available on EDGAR 08/18/2026 - 04:04 PM Accepted by SEC EDGAR 08/18/2026 - 04:03 PM 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)
08/18/2026

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	08/17/2026		G	V	336,000	A	$0	1,377,553	D
Ordinary Shares, par value $0.01 per share	08/18/2026		G		627,553	D	$0	750,000	D
Ordinary Shares, par value $0.01 per share								83,500	I	By Manatee Equity Fund LLC(1)
Ordinary Shares, par value $0.01 per share								52,000	I	By 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)
				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	08/18/2026
	** 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)