PRTA SEC Filings: 8-K, 10-Q, S-3 & 424B – Prothena

Financials

TYPE

HEADLINE

FILED AT

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Nov 5, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Aug 6, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

May 7, 2026

10-K

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]

Feb 27, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Nov 6, 2025

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Aug 4, 2025

News

TYPE

HEADLINE

FILED AT

8-K

Prothena Reports Third Quarter 2026 Financial Results and Business Highlights

Nov 5, 2026

8-K

Bristol Myers Squibb Terminates PRX019 Global License Agreement with Prothena

Oct 29, 2026

8-K

Prothena Announces Resignation of Chief Development Officer Chad J. Swanson

Oct 2, 2026

8-K

Prothena Reports Second Quarter 2026 Financial Results and Business Highlights

Aug 6, 2026

8-K

Prothena Corporation Announces Results of 2026 Annual General Meeting

May 15, 2026

8-K

Prothena Reports First Quarter 2026 Financial Results and Business Highlights

May 7, 2026

Prospectus

TYPE

HEADLINE

FILED AT

424B5

SHELF OFFERING | Shares amount: 3,250,000 | Share price: $56.50 | Offering amount: $183,625,000.00 | Bank: Jefferies, Evercore ISI, Cantor Oppenheimer & Co., JMP Securities, a Citizens Company, H.C. Wainwright & Co.

Dec 16, 2022

424B5

Shares amount: 3,000,000 | Bank: Jefferies, Evercore ISI, Cantor

Dec 13, 2022

424B5

Up to $250,000,000-

Dec 23, 2021

424B5

Up to $100,000,000-

May 28, 2021

424B5

3,500,000 Shares-

Mar 24, 2021

424B5

295,380-

Mar 23, 2021

Registrations

TYPE

HEADLINE

FILED AT

POS AM

Form POS AM - Post-Effective amendments for registration statement

Feb 27, 2026

POSASR

Form POSASR - Post-effective Amendment to an automatic shelf registration statement

Feb 27, 2026

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

Aug 8, 2025

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

Aug 8, 2024

S-3ASR

SHELF | ATM | Offering amount: $250,000,000.00

Feb 22, 2024

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

Aug 3, 2023

Proxies

TYPE

HEADLINE

FILED AT

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Mar 27, 2026

DEF 14A

Form DEF 14A - Other definitive proxy statements

Mar 27, 2026

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Nov 6, 2025

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Oct 7, 2025

DEF 14A

Form DEF 14A - Other definitive proxy statements

Oct 7, 2025

PRE 14A

Form PRE 14A - Other preliminary proxy statements

Sep 25, 2025

Ownerships

TYPE

HEADLINE

FILED AT

SCULLY WILLIAM P (Reporting)

Oct 29, 2026

SCULLY WILLIAM P (Reporting)

Oct 26, 2026

SCULLY WILLIAM P (Reporting)

Oct 15, 2026

SCULLY WILLIAM P (Reporting)

Oct 9, 2026

SCULLY WILLIAM P (Reporting)

Oct 6, 2026

SCULLY WILLIAM P (Reporting)

Sep 30, 2026

Other

TYPE

HEADLINE

FILED AT

EFFECT

Form EFFECT - Notice of Effectiveness

Mar 3, 2026

LETTER

Form UPLOAD - SEC-generated letter

Aug 23, 2023

CORRESP

Form CORRESP - Correspondence

Aug 4, 2023

LETTER

Form UPLOAD - SEC-generated letter

Jul 25, 2023

CT ORDER

Form CT ORDER - Confidential treatment order

Apr 20, 2021

EFFECT

Form EFFECT - Notice of Effectiveness

Dec 13, 2019

Prothena Corporation plc PRTA · SEC Filings