Prothena (NASDAQ: PRTA) major holder gifts 325,000 shares

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

PROTHENA CORP PUBLIC LTD CO ten percent owner William P. Scully reported a bona fide gift of 325,000 ordinary shares on June 15, 2026. The gift was recorded at a price of $0.00 per share.

After this transfer, Scully directly holds 736,000 ordinary shares and has additional indirect holdings of 52,000 shares through his spouse and 80,000 shares through Manatee Equity Fund LLC. He disclaims beneficial ownership of certain indirectly held securities except to the extent of his pecuniary interest.

Insider Trade Summary

325,000 shares gifted

Mixed 3 txns

Insider SCULLY WILLIAM P

Role null

Type	Security	Shares	Price	Value
Gift	Ordinary Shares, par value $0.01 per share	325,000	$0.00	--
holding	Ordinary Shares, par value $0.01 per share	--	--	--
holding	Ordinary Shares, par value $0.01 per share	--	--	--

Holdings After Transaction: Ordinary Shares, par value $0.01 per share — 736,000 shares (Direct, null); Ordinary Shares, par value $0.01 per share — 80,000 shares (Indirect, By Manatee Equity Fund LLC)

Footnotes (1)

[object Object]

Key Figures

Gifted shares: 325,000 shares Gift price: $0.00 per share Direct holdings after gift: 736,000 shares +3 more

6 metrics

Gifted shares 325,000 shares Bona fide gift of ordinary shares on June 15, 2026

Gift price $0.00 per share Reported transaction price for 325,000 gifted shares

Direct holdings after gift 736,000 shares Ordinary shares directly held by Scully following the transaction

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

Indirect holdings via Manatee Equity Fund LLC 80,000 shares Ordinary shares held indirectly through Manatee Equity Fund LLC

Total gifts reported 1 transaction, 325,000 shares Gift disposition count and shares in transaction summary

Key Terms

bona fide gift, ten percent owner, indirect ownership, Ordinary Shares, par value $0.01 per share, +1 more

5 terms

bona fide gift financial

"The transaction is coded as a bona fide gift of ordinary 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.

ten percent owner financial

"The reporting person is identified as a ten percent owner of the issuer."

indirect ownership financial

"Indirect ownership is reported via a spouse and Manatee Equity Fund LLC."

pecuniary interest financial

"He disclaims beneficial ownership except to the extent of his pecuniary interest."

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google

Form 4 Insider Transactions: What Each Field Means →

06/16/2026 - 04:58 PM

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)
06/15/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Ordinary Shares, par value $0.01 per share	06/15/2026		G		325,000	D	$0	736,000	D
Ordinary Shares, par value $0.01 per share								80,000	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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	06/16/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did PRTA holder William P. Scully report?

William P. Scully reported a bona fide gift of 325,000 Prothena ordinary shares. The transfer occurred on June 15, 2026 at a reported price of $0.00 per share, indicating no sale proceeds, only a change in ownership.

How many Prothena (PRTA) shares does William P. Scully hold after this Form 4?

After the reported gift, Scully directly holds 736,000 Prothena ordinary shares. In addition, the filing shows 52,000 shares held indirectly through his spouse and 80,000 shares held indirectly through Manatee Equity Fund LLC.

Was the Prothena (PRTA) insider transaction a purchase or sale?

The filing reports a bona fide gift, not a market purchase or sale. The 325,000 ordinary shares were transferred at a stated price of $0.00 per share, meaning no trading proceeds were involved in this disposition.

What does the bona fide gift of 325,000 PRTA shares imply?

A bona fide gift is a no‑cost transfer of shares to another party. It changes who owns the 325,000 Prothena ordinary shares but does not generate cash for the insider or directly indicate a market view on the stock.

How are indirect Prothena (PRTA) holdings reported for William P. Scully?

Indirect holdings are shown as 52,000 shares owned by his spouse and 80,000 shares owned by Manatee Equity Fund LLC. The filing notes that Scully disclaims beneficial ownership of these securities except to the extent of his pecuniary interest.

Does the Prothena Form 4 show any option exercises or derivative trades?

The Form 4 data provided shows no derivative securities or option exercises. All reported positions are in ordinary shares, with one bona fide gift transaction and separate entries describing indirect holdings through related parties.