| Item 1. | |
| (a) | Name of issuer:
PROTHENA CORP PUBLIC LTD CO |
| (b) | Address of issuer's principal executive offices:
77 SIR JOHN ROGERSON'S QUAY, BLOCK C, GRAND CANAL DOCKLANDS, DUBLIN 2, IRELAND, D02 VK60. |
| Item 2. | |
| (a) | Name of person filing:
Todd W. Fennell |
| (b) | Address or principal business office or, if none, residence:
979 Beachland Boulevard, Vero Beach, Florida 32963 |
| (c) | Citizenship:
Florida |
| (d) | Title of class of securities:
Ordinary Shares, $0.01 par value |
| (e) | CUSIP No.:
G72800108 |
| Item 3. | If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: |
| (a) |  Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
|
| (b) | Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
|
| (c) | Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
|
| (d) | Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
|
| (e) | An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
|
| (f) | An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
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| (g) | A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
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| (h) | A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
|
| (i) | A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
|
| (j) | A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
|
| (k) | Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
|
| | |
| Item 4. | Ownership |
| (a) | Amount beneficially owned:
The Reporting Person may be deemed to be the beneficial owner of 5,248,846 Ordinary Shares. This amount consists of (i) 215,000 owned by various trusts, for which the Reporting Person serves as an independent trustee, and (ii) 5,033,846 Ordinary Shares owned in the aggregate by various grantor retained annuity trusts, for which the Reporting Person serves as an independent trustee. |
| (b) | Percent of class:
According to the Issuers most recent Quarterly Report on Form 10-Q for the quarter ended June 30, 2026, the number of shares outstanding as of July 30, 2026 was 51,336,974. The Ordinary Shares which the Reporting Person may be deemed to beneficially own constitute approximately 10.22% of such total number of shares.
The Reporting Person disclaims beneficial ownership of all Ordinary Shares to which the Reporting Person does not have a pecuniary interest, and the Reporting Person expressly disclaims any status as a group with any other party. |
| (c) | Number of shares as to which the person has:
|
| | (i) Sole power to vote or to direct the vote:
0
|
| | (ii) Shared power to vote or to direct the vote:
5,248,846
|
| | (iii) Sole power to dispose or to direct the disposition of:
0
|
| | (iv) Shared power to dispose or to direct the disposition of:
5,248,846
|
| Item 5. | Ownership of 5 Percent or Less of a Class. |
| |
Not Applicable
|
| Item 6. | Ownership of more than 5 Percent on Behalf of Another Person. |
| |
Not Applicable
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| Item 7. | Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person. |
| |
Not Applicable
|
| Item 8. | Identification and Classification of Members of the Group. |
| |
Not Applicable
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| Item 9. | Notice of Dissolution of Group. |
| |
Not Applicable
|
Rule 13d-1(c)