Prothena (PRTA) Form 3 shows Todd W. Fennell as ten percent owner

Rhea-AI Filing Summary

PROTHENA CORP PUBLIC LTD CO filed an initial statement of beneficial ownership identifying Todd W. Fennell as a ten percent owner of the company. The filing does not report any specific transactions or detailed holdings and includes a reference to a Power of Attorney as an exhibit.

Key Terms

ten percent owner, Power of Attorney, beneficial ownership

3 terms

ten percent owner regulatory

"identifying Todd W. Fennell as a ten percent owner of the company"

Power of Attorney regulatory

"Exhibit 24 - Power of Attorney is referenced in the remarks"

A power of attorney is a legal document that allows one person to make decisions and act on behalf of another person, often in financial or legal matters. It’s like giving someone a trusted helper or agent the authority to handle important tasks if you are unable to do so yourself. This matters to investors because it can impact how their assets are managed or transferred if they become unable to oversee their affairs.

beneficial ownership financial

"an initial statement of beneficial ownership identifying Todd W. Fennell"

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.

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

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FAQ

What does the Form 3 filed for PRTA and Todd W. Fennell show?

The Form 3 identifies Todd W. Fennell as a ten percent owner of Prothena Corp Public Ltd Co. It is an initial statement of beneficial ownership and does not list any specific transactions.

Are any stock transactions reported for PRTA in this Form 3?

No. The Form 3 for PRTA shows no reported transactions for Todd W. Fennell. It only establishes his status as a ten percent owner without detailing trades or positions.

What role does Todd W. Fennell have at PRTA according to this filing?

According to the Form 3, Todd W. Fennell is reported as a ten percent owner of PRTA and is not listed as a director or officer. No other roles are indicated.

Does the PRTA Form 3 include a Rule 10b5-1 trading plan disclosure?

No. The data for the PRTA Form 3 shows the Rule 10b5-1 trading plan indicator as null, and there are no transactions or footnotes describing any trading plan.

What exhibits are referenced in Todd W. Fennell’s Form 3 for PRTA?

The remarks section references an exhibit titled Exhibit 24 - Power of Attorney. This typically authorizes someone to sign SEC documents on the reporting person’s behalf.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Fennell Todd W.

(Last) (First) (Middle)

979 BEACHLAND BOULEVARD

(Street)

VERO BEACH FLORIDA 32963

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
08/06/2026

3. Issuer Name and Ticker or Trading Symbol
PROTHENA CORP PUBLIC LTD CO [ PRTA ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

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

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit List: Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	Reid E. Buchanan by POA from Todd W. Fennell	08/11/2026
	** 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 5 (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 3: SEC 1473 (03-26)