# EDGAR Filing Document

**Accession Number:** 0001559053
**File Stem:** 0001193125-26-226968
**Filing Date:** 2026-5
**Character Count:** 6330
**Document Hash:** f113745de100a82215aeec0c4f81524d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-226968.hdr.sgml**: 20260515

**ACCESSION NUMBER**: 0001193125-26-226968

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 11

**CONFORMED PERIOD OF REPORT**: 20260514

**ITEM INFORMATION**: Submission of Matters to a Vote of Security Holders

**FILED AS OF DATE**: 20260515

**DATE AS OF CHANGE**: 20260515

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PROTHENA CORP PUBLIC LTD CO
- **CENTRAL INDEX KEY:** 0001559053
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** L2
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35676
- **FILM NUMBER:** 26988559

**BUSINESS ADDRESS:**
- **STREET 1:** 77 SIR JOHN ROGERSON'S QUAY, BLOCK C
- **STREET 2:** GRAND CANAL DOCKLANDS
- **CITY:** DUBLIN 2
- **STATE:** L2
- **ZIP:** D02 VK60
- **BUSINESS PHONE:** 011-353-1-236-2500

**MAIL ADDRESS:**
- **STREET 1:** 77 SIR JOHN ROGERSON'S QUAY, BLOCK C
- **STREET 2:** GRAND CANAL DOCKLANDS
- **CITY:** DUBLIN 2
- **STATE:** L2
- **ZIP:** D02 VK60

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Prothena Corp plc
- **DATE OF NAME CHANGE:** 20121102

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Neotope Corp Ltd
- **DATE OF NAME CHANGE:** 20120926

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): May 14, 2026

## PROTHENA CORPORATION PUBLIC LIMITED COMPANY

#### (Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Ireland** | **001-35676** | **98-1111119** |
| **(State or Other Jurisdiction**<br> **of Incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

---

| |
|:---|
| **77 Sir John Rogerson's Quay, Block C** |
| **Grand Canal Docklands** |
| **Dublin 2, D02 VK60, Ireland** |
| **(Address of principal executive offices, including Zip Code)** |

---

011 353 1 236 2500

#### Registrant's telephone number, including area code: 011-353-1-236-2500

#### (Former Name or Former Address, if Changed Since Last Report.)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (*see* General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of Each Class** | **Trading<br>Symbol** | **Name of Each Exchange<br>on Which Registered** |
| Ordinary Shares, par value $0.01 per share | PRTA | The Nasdaq Global Select Market |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

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| | |
|:---|:---|
| **Item 5.07.** | **Submission of Matters to a Vote of Security Holders.**  |

---

On May 14, 2026, Prothena Corporation plc (the "Company") held its annual general meeting of shareholders, at which the Company's shareholders voted on the following proposals, each of which is described in the Company's definitive proxy statement filed with the Securities and Exchange Commission on March 27, 2026 (the "Proxy Statement"):

**Proposal No. 1: Election of Directors.** The shareholders re-elected the following individuals to the Company's Board of Directors to hold office until no later than the annual general meeting of shareholders in 2029.

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| **Nominee** | **For** | **For** | **Against** | **Against** | **Abstain** | **Abstain** | **Broker Non-Votes** |
|  Shane M. Cooke |  | 22720769 |  | 11923467 |  | 9139 | 7374142 |
|  Dennis J. Selkoe |  | 25226560 |  | 9420544 |  | 6271 | 7374142 |

---

**Proposal No. 2: Ratification of Appointment of the Company's Independent Registered Public Accounting Firm for 2026 and Authorization of the Board of Directors to Approve the Remuneration of that Auditor.** The shareholders ratified, in a non-binding vote, the appointment of KPMG LLP as the Company's independent registered public accounting firm for its fiscal year ending December 31, 2026, and authorized, in a binding vote, the Company's Board of Directors, acting through its Audit Committee, to approve the remuneration of that auditor.

---

| | | |
|:---|:---|:---|
| **For** | **Against** | **Abstain** |
| 41931718 | 82815 | 12984 |

---

**Proposal No. 3: Approval of Compensation of the Company's Named Executive Officers.** The shareholders approved, in a non-binding advisory vote, the compensation of the Company's executive officers named in the Proxy Statement.

---

| | | | |
|:---|:---|:---|:---|
| **For** | **Against** | **Abstain** | **Broker Non-Votes** |
| 32303076 | 1145400 | 1204899 | 7374142 |

---

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
| Date: May 15, 2026 | **PROTHENA CORPORATION PLC** | **PROTHENA CORPORATION PLC** |
|  | By: | /s/ Tran B. Nguyen |
|  | Name: | Tran B. Nguyen |
|  | Title: | Chief Financial Officer |

---