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Prothena (PRTA) Chief Strategy Officer reports 66,942 shares and option grants

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Prothena Corp Public Ltd Co’s Chief Strategy Officer Anne Evans Kingston filed an initial ownership report showing her equity position in the company. She directly holds 66,942 Ordinary Shares and a series of employee stock options over additional Ordinary Shares.

The options cover 5,000 shares at $53.81 per share expiring on May 1, 2033, 3,000 shares at $30.30 per share expiring on February 27, 2034, and 14,080 shares at $14.95 per share expiring on March 5, 2035. Footnotes explain that each grant vests 25% on an initial date, then in equal monthly installments over four years, conditioned on her continued employment with Prothena on each vesting date.

Positive

  • None.

Negative

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Insider Kingston Anne Evans
Role Chief Strategy Officer
Type Security Shares Price Value
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Stock Option (Right to Buy) -- -- --
holding Ordinary Shares, par value $0.01 per share -- -- --
Holdings After Transaction: Stock Option (Right to Buy) — 5,000 shares (Direct); Ordinary Shares, par value $0.01 per share — 66,942 shares (Direct)
Footnotes (1)
  1. The shares subject to the option vested and became exercisable as to 25% of the total number of shares subject to the option on May 1, 2024, and vest and become exercisable with respect to 1/48th of the total number of shares subject to the option in successive, equal monthly installments on each monthly anniversary thereafter, subject to the Reporting Person's continued employment with the Issuer on each such vesting date. The shares subject to the option vested and became exercisable as to 25% of the total number of shares subject to the option on February 27, 2025, and vest and become exercisable with respect to 1/48th of the total number of shares subject to the option in successive, equal monthly installments on each monthly anniversary thereafter, subject to the Reporting Person's continued employment with the Issuer on each such vesting date. The shares subject to the option vested and became exercisable as to 25% of the total number of shares subject to the option on March 5, 2026, and vest and become exercisable with respect to 1/48th of the total number of shares subject to the option in successive, equal monthly installments on each monthly anniversary thereafter, subject to the Reporting Person's continued employment with the Issuer on each such vesting date.
Direct Ordinary Shares 66,942 shares Directly owned Ordinary Shares reported in Form 3
Stock options at $53.81 5,000 shares Stock Option (Right to Buy), exercise price $53.81, expires May 1, 2033
Stock options at $30.30 3,000 shares Stock Option (Right to Buy), exercise price $30.30, expires February 27, 2034
Stock options at $14.95 14,080 shares Stock Option (Right to Buy), exercise price $14.95, expires March 5, 2035
Initial vesting schedule 25% at first vest date Each option grant vests 25% on its initial vesting date
Ongoing vesting schedule 1/48th monthly Remaining option shares vest in equal monthly installments over four years
Stock Option (Right to Buy) financial
"security_title: "Stock Option (Right to Buy)" for multiple entries"
Ordinary Shares financial
"underlying_security_title: "Ordinary Shares" in option descriptions"
Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.
vest and become exercisable financial
"The shares subject to the option vested and became exercisable as to 25%..."
monthly installments financial
"vest and become exercisable with respect to 1/48th ... in successive, equal monthly installments"
Monthly installments are regular, fixed payments made each month to gradually pay off a larger amount, such as a loan or purchase. Think of it like paying for a big item in small, manageable parts instead of all at once. For investors, understanding installment payments helps gauge how debts are structured and how they might affect financial stability or cash flow over time.
continued employment financial
"subject to the Reporting Person's continued employment with the Issuer on each such vesting date"
Continued employment means that an individual remains in their current job without interruption. For investors, it signals stability and ongoing work that can affect company performance and future prospects. Like a steady heartbeat for a business, sustained employment helps ensure consistent operations and financial health.
SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
Kingston Anne Evans

(Last)(First)(Middle)
C/O PROTHENA BIOSCIENCES INC
1800 SIERRA POINT PARKWAY

(Street)
BRISBANE CALIFORNIA 94005

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
04/10/2026
3. Issuer Name and Ticker or Trading Symbol
PROTHENA CORP PUBLIC LTD CO [ PRTA ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Strategy Officer
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares, par value $0.01 per share66,942D
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (Right to Buy) (1)05/01/2033Ordinary Shares5,000$53.81D
Stock Option (Right to Buy) (2)02/27/2034Ordinary Shares3,000$30.3D
Stock Option (Right to Buy) (3)03/05/2035Ordinary Shares14,080$14.95D
Explanation of Responses:
1. The shares subject to the option vested and became exercisable as to 25% of the total number of shares subject to the option on May 1, 2024, and vest and become exercisable with respect to 1/48th of the total number of shares subject to the option in successive, equal monthly installments on each monthly anniversary thereafter, subject to the Reporting Person's continued employment with the Issuer on each such vesting date.
2. The shares subject to the option vested and became exercisable as to 25% of the total number of shares subject to the option on February 27, 2025, and vest and become exercisable with respect to 1/48th of the total number of shares subject to the option in successive, equal monthly installments on each monthly anniversary thereafter, subject to the Reporting Person's continued employment with the Issuer on each such vesting date.
3. The shares subject to the option vested and became exercisable as to 25% of the total number of shares subject to the option on March 5, 2026, and vest and become exercisable with respect to 1/48th of the total number of shares subject to the option in successive, equal monthly installments on each monthly anniversary thereafter, subject to the Reporting Person's continued employment with the Issuer on each such vesting date.
Remarks:
Exhibit List: Exhibit 24 - Power of Attorney
/s/ Michael J. Malecek, as Attorney-in-Fact for Anne E. Kingston04/10/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What does the Form 3 filing by Prothena (PRTA) executive Anne Evans Kingston show?

The Form 3 shows Anne Evans Kingston’s initial ownership in Prothena, including 66,942 Ordinary Shares and multiple stock option grants. These options give rights to buy additional shares at fixed prices over several years, subject to time-based vesting and continued employment conditions.

How many Prothena (PRTA) shares does Anne Evans Kingston directly own?

Anne Evans Kingston directly owns 66,942 Ordinary Shares of Prothena. This position reflects her current direct equity stake, separate from stock options that may be exercised in the future if vesting and other conditions are satisfied over the specified vesting schedule.

What stock options are reported for Anne Evans Kingston in Prothena (PRTA)?

She holds stock options over 5,000 Ordinary Shares at $53.81, 3,000 shares at $30.30, and 14,080 shares at $14.95. Each grant has its own expiration date and vests 25% initially, then monthly in equal installments over four years, contingent on continued employment.

How do the vesting terms work for Anne Evans Kingston’s Prothena (PRTA) options?

Each option grant vests 25% on a stated initial date, then vests 1/48th of the total monthly. Vesting continues on each monthly anniversary as long as she remains employed by Prothena, gradually increasing the portion of options that become exercisable over four years.

Does this Prothena (PRTA) Form 3 indicate stock purchases or sales by Anne Evans Kingston?

The Form 3 does not indicate purchases or sales; it reports existing holdings and option awards. All transactions are coded as holdings, meaning the filing establishes her baseline ownership position rather than recording new market trades in Prothena shares.