# EDGAR Filing Document

**Accession Number:** 0001045463
**File Stem:** 0001193125-23-038726
**Filing Date:** 2023-2
**Character Count:** 12112
**Document Hash:** 74cb5208b4b0d254efde84d0029c3f86
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-038726.hdr.sgml**: 20230214

**ACCESSION NUMBER**: 0001193125-23-038726

**CONFORMED SUBMISSION TYPE**: SC 13G/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230214

**DATE AS OF CHANGE**: 20230214

**SUBJECT COMPANY**: 

**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:** SC 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-87112
- **FILM NUMBER:** 23627236

**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
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SCULLY WILLIAM P
- **CENTRAL INDEX KEY:** 0001045463

**FILING VALUES:**
- **FORM TYPE:** SC 13G/A

**MAIL ADDRESS:**
- **STREET 1:** C/O MCGRATH DOYLE & PHAIR
- **STREET 2:** 150 BROADWAY
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10038

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**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

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**SCHEDULE 13G/A** 

**Under the Securities Exchange Act of 1934** 

**(Amendment No. 1) \*** 

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## Prothena Corporation PLC
**(Name of Issuer)** 

**Ordinary Shares, $0.01 par value** 

**(Title of Class of Securities)** 

**G72800108** 

**(CUSIP Number)** 

**Diana L. Hayes, Esq.** 

**Trenam Law** 

**2700 Bank of America Plaza** 

**Tampa, Florida 33602** 

**813-227-7433** 

**(Name, Address and Telephone Number of Person Authorized to** 

**Receive Notices and Communications)** 

**December 31, 2022** 

**(Date of Event which Requires Filing of this Statement)** 

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Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☒ Rule 13d-1(c)

☐ Rule 13d-1(d)

\* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 (the "Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, *see* the *Notes*).

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| | | |
|:---|:---|:---|
| **CUSIP No. G72800108** | **Schedule 13G/A** | **Page 2 of 5 Pages** |

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|:---|:---|
| &nbsp;&nbsp;&nbsp; 1 | &nbsp;&nbsp;&nbsp;&nbsp;NAME OF REPORTING PERSON<br>&nbsp;&nbsp;&nbsp;&nbsp;William P. Scully |
| &nbsp;&nbsp;&nbsp; 2 | &nbsp;&nbsp;&nbsp;&nbsp;CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP<br> &nbsp;&nbsp;&nbsp;&nbsp;(a) ☐ (b) ☐ |
| &nbsp;&nbsp;&nbsp; 3 | &nbsp;&nbsp;&nbsp;&nbsp;SEC USE ONLY |
| &nbsp;&nbsp;&nbsp; 4 | &nbsp;&nbsp;&nbsp;&nbsp;CITIZENSHIP OR PLACE OF ORGANIZATION<br>&nbsp;&nbsp;&nbsp;&nbsp;Florida |

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| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5 | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;316,000\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6 | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;2,147,000\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7 | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;316,000\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8 | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp; 2,147,000\* |

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| | |
|:---|:---|
| &nbsp;&nbsp;&nbsp; 9 | &nbsp;&nbsp;&nbsp;&nbsp;AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>&nbsp;&nbsp;&nbsp;&nbsp;2,463,000\* |
| &nbsp;&nbsp;&nbsp;10 | &nbsp;&nbsp;&nbsp;&nbsp;CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES<br>&nbsp;&nbsp;&nbsp;&nbsp;☐ |
| &nbsp;&nbsp;&nbsp;11 | &nbsp;&nbsp;&nbsp;&nbsp;PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>&nbsp;&nbsp;&nbsp;&nbsp;4.82%\* |
| &nbsp;&nbsp;&nbsp;12 | &nbsp;&nbsp;&nbsp;&nbsp;TYPE OF REPORTING PERSON<br>&nbsp;&nbsp;&nbsp;&nbsp;IN |

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\* See Item 4.

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| | | |
|:---|:---|:---|
| **CUSIP No. G72800108** | **Schedule 13G/A** | **Page 3 of 5 Pages** |

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**Item 1.** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(a)** **Name of Issuer:** 

Prothena Corporation PLC

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(b)** **Address of Issuer's Principal Executive Office:** 

77 Sir John Rogerson's Quay, Block C

Grand Canal Docklands

Dublin 2, D02 VK60, Ireland

**Item 2.** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(a)** The name of the Reporting Person is William P. Scully.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(b)** The address of the Reporting Person is 771 Manatee Cove, Vero Beach, Florida 32963.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(c)** The citizenship of the Reporting Person is Florida.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(d)** Title and class of securities: Ordinary Shares, $0.01 par value

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(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:

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| | | |
|:---|:---|:---|
| (a) | ☐ | Broker or dealer registered under section 14 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) |
| (g) | ☐ | A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G) |
| (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) |
| (k) | ☐ | Group, in accordance with § 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution: ____ |

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Not applicable

**Item 4.** **Ownership.** <br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) <u>Amount beneficially owned</u>:

As of December 31, 2022, the Reporting Person may be deemed to be the beneficial owner of 2,463,000 Ordinary Shares. This amount consists of (i) 10,000 Ordinary Shares owned directly by the Reporting Person over which he has sole voting and dispositive power, (ii) 54,500 owned by Manatee Equity Fund LLC, of which the Reporting Person is the sole manager with sole voting and dispositive power, (iii) 251,500 Ordinary Shares owned by the Reporting Person's IRA, over which he has sole voting and dispositive power, (iv) 2,000 Ordinary Shares owned by the Reporting Person's spouse, over which he

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| | | |
|:---|:---|:---|
| **CUSIP No. G72800108** | **Schedule 13G/A** | **Page 4 of 5 Pages** |

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may be deemed to have shared voting and dispositive power, (v) 8,000 Ordinary Shares owned by an IRA subject to an investment management agreement over which the Reporting Person may be deemed to have shared voting and dispositive power by reason of his right to terminate such agreement, and (vi) 2,137,000 Ordinary Shares owned in the aggregate by various grantor retained annuity trusts, which have an independent trustee, but over which the Reporting Person may be deemed to have shared voting and dispositive power by reason of his retained right to substitute assets in such trusts.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) <u>Percent of Class</u>:

According to the Issuer's Prospectus filed on December 16, 2022, the number of shares outstanding immediately after the offering to which the prospectus related was 51,135,755. The Ordinary Shares which the Reporting Person may be deemed to beneficially own as of December 31, 2022 constitute approximately 4.82% of such total number of shares. As a result, the Reporting Person has checked the box in Item 5 reporting that he no longer is the beneficial owner of more than 5% of the Ordinary Shares.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) <u>Number of shares as to which the Reporting Person has</u>:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i. Sole power to vote or direct the vote: 316,000

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ii. Shared power to vote or direct the vote: 2,147,000

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iii. Sole power to vote or direct the vote:316,000

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iv. Shared power to vote or direct the vote: 2,147,000

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.

**Item 5.** **Ownership of Five Percent or Less of a Class.** <br>

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5 percent of the class of securities, check the following ☒.

**Item 6.** **Ownership of More than Five Percent on Behalf of Another Person.** <br>

Not applicable.

**Item 7.** **Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.** <br>

Not applicable.

**Item 8.** **Identification and Classification of Members of the Group.** <br>

Not applicable.

**Item 9.** **Notice of Dissolution of Group.** <br>

Not applicable.

**Item 10.** **Certification.** <br>

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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|:---|:---|:---|
| **CUSIP No. G72800108** | **Schedule 13G/A** | **Page 5 of 5 Pages** |

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**SIGNATURE** 

After reasonable inquiry and to the best of his knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

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| | |
|:---|:---|
| Dated: February 14, 2023 | Dated: February 14, 2023 |
| **WILLIAM P. SCULLY,** individually | **WILLIAM P. SCULLY,** individually |
|  | /s/ William P. Scully |
|  | William P. Scully |

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