[Form 3] Phathom Pharmaceuticals, Inc. Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Anne Marie Cook has filed an initial Form 3 Statement of Beneficial Ownership following her appointment as Chief Legal Officer & Corporate Secretary at Phathom Pharmaceuticals (PHAT). The filing, dated June 28, 2025, discloses her beneficial ownership status as of June 23, 2025.

Key details of the filing:

• Cook currently owns no securities of Phathom Pharmaceuticals
• No derivative securities (options, warrants, etc.) are reported as beneficially owned
• The filing is made as an individual submission, not as part of a group
• Direct ownership form is indicated for the zero securities position

This Form 3 filing is a standard regulatory requirement for new officers, directors, and 10% shareholders under Section 16(a) of the Securities Exchange Act of 1934, establishing a baseline for future transaction reporting.

SEC Form 3

FORM 3

UNITED 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

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1. Name and Address of Reporting Person^*

Cook Anne Marie

(Last) (First) (Middle)

C/O PHATHOM PHARMACEUTICALS, INC.

100 CAMPUS DRIVE, SUITE 102

(Street)

FLORHAM PARK NJ 07932

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
06/23/2025

3. Issuer Name and Ticker or Trading Symbol
Phathom Pharmaceuticals, Inc. [ PHAT ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Legal Off. & Corp. Sec.

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form 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)
No securities are beneficially owned.	0	D

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 Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Anne Marie Cook	06/24/2025
	** Signature of Reporting Person	Date
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.

FAQ

Who is the new Chief Legal Officer of Phathom Pharmaceuticals (PHAT)?

Anne Marie Cook was appointed as Chief Legal Officer & Corporate Secretary of Phathom Pharmaceuticals (PHAT), as reported in a Form 3 filing dated June 28, 2025.

How many shares does Anne Marie Cook own in PHAT upon appointment?

According to the Form 3 filing, Anne Marie Cook owns no securities (0 shares) beneficially in Phathom Pharmaceuticals (PHAT) at the time of her appointment as Chief Legal Officer.

When did Anne Marie Cook join PHAT as Chief Legal Officer?

The Form 3 filing indicates that Anne Marie Cook's appointment event date was June 23, 2025, requiring this initial statement of beneficial ownership filing.

Does PHAT's new Chief Legal Officer hold any derivative securities in the company?

According to Table II of the Form 3 filing, Anne Marie Cook does not hold any derivative securities (such as stock options, warrants, or convertible securities) in Phathom Pharmaceuticals at the time of the filing.

What is the business address for PHAT's new Chief Legal Officer?

The business address listed for Anne Marie Cook is c/o Phathom Pharmaceuticals, Inc., 100 Campus Drive, Suite 102, Florham Park, NJ 07932.