# EDGAR Filing Document

**Accession Number:** 0001559053
**File Stem:** 0001140361-23-015353
**Filing Date:** 2023-3
**Character Count:** 2293
**Document Hash:** d4bc771e3e45b18d72a6055da06ac707
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-23-015353.hdr.sgml**: 20230331

**ACCESSION NUMBER**: 0001140361-23-015353

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230331

**DATE AS OF CHANGE**: 20230331

**FILER**: 

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

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35676
- **FILM NUMBER:** 23787964

**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

### UNITED STATES<br>

### SECURITIES AND EXCHANGE COMMISSION<br>

### Washington, D.C. 20549

### SCHEDULE 14A

#### Proxy Statement Pursuant to Section 14(a) of the<br>

#### Securities Exchange Act of 1934
Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐<br> Preliminary Proxy Statement

☐<br> Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐<br> Definitive Proxy Statement

☒<br> Definitive Additional Materials

☐<br> Soliciting Material Pursuant to § 240.14a-12

### PROTHENA CORPORATION PUBLIC LIMITED COMPANY<br>

### (Name of registrant as specified in its charter) <br>

#### (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of Filing Fee (Check all boxes that apply):

☒ No fee required.

☐ Fee paid previously with preliminary materials.

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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