Alumis CMO exercises options for 26,852 shares

Alumis Inc. Chief Medical Officer Jorn Drappa exercised stock options to acquire 26,852 shares of common stock.

Rhea-AI Filing Summary

Alumis Inc. Chief Medical Officer Jorn Drappa exercised stock options to acquire 26,852 shares of common stock. The Form 4 shows two option exercises on May 22, 2026, covering 15,535 shares at an exercise price of $5.06 per share and 11,317 shares at $8.84 per share. All transactions are coded as exercises of derivative securities, with no open-market purchases or sales reported in this filing.

Insider Trade Summary

26,852 shares exercised/converted

Exercise 4 txns

Insider Drappa Jorn

Role Chief Medical Officer

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy)	11,317	$0.00	$0.00
Exercise	Stock Option (Right to Buy)	15,535	$0.00	$0.00
Exercise	Common Stock	11,317	$8.84	$100K
Exercise	Common Stock	15,535	$5.06	$79K

Holdings After Transaction: Stock Option (Right to Buy) — 324,270 contracts (Direct); Common Stock — 59,339 shares (Direct)

Footnotes (3)

1. F1. Includes 1,037 shares acquired on November 20, 2025 and 3,000 shares acquired on May 20, 2026 under the Issuer's 2024 Employee Stock Purchase Plan.
2. F2. 25% of the shares underlying this option vested on August 22, 2023, and the remaining shares vest in equal monthly installments thereafter over the following 36 months, subject to acceleration and the Reporting Person's continuous service to the Issuer on each such vesting date.
3. F3. 25% of the shares underlying this option vested on February 18, 2026, and the remaining shares vest in equal monthly installments thereafter over the following 36 months, subject to acceleration and the Reporting Person's continuous service to the Issuer on each such vesting date.

Key Figures

Options exercised: 26,852 shares Strike price 1: $5.06/share Strike price 2: $8.84/share +5 more

8 metrics

Options exercised 26,852 shares Total common shares acquired via option exercise on May 22, 2026

Strike price 1 $5.06/share Exercise price for 15,535 options into common stock

Strike price 2 $8.84/share Exercise price for 11,317 options into common stock

Exercised option block 1 15,535 options Stock Option (Right to Buy) exercised at $5.06 on May 22, 2026

Exercised option block 2 11,317 options Stock Option (Right to Buy) exercised at $8.84 on May 22, 2026

Vesting schedule 1 25% on Aug 22, 2023 Remaining option shares vest monthly over 36 months thereafter

Vesting schedule 2 25% on Feb 18, 2026 Remaining option shares vest monthly over 36 months thereafter

ESPP shares 4,037 shares 1,037 shares on Nov 20, 2025 and 3,000 on May 20, 2026

Key Terms

Stock Option (Right to Buy), Employee Stock Purchase Plan, derivative security, vesting, +1 more

5 terms

Stock Option (Right to Buy) financial

"security_title: "Stock Option (Right to Buy)" linked to common stock"

Employee Stock Purchase Plan financial

"acquired under the Issuer's 2024 Employee Stock Purchase Plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

derivative security financial

"transaction_code_description: "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

vesting financial

"25% of the shares underlying this option vested on August 22, 2023"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

continuous service financial

"subject to ... the Reporting Person's continuous service to the Issuer"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Alumis (ALMS) report for Jorn Drappa?

Alumis reported that Chief Medical Officer Jorn Drappa exercised stock options to acquire 26,852 shares of common stock. The Form 4 shows two option exercises on May 22, 2026, without any open-market purchases or sales in this filing.

How many Alumis (ALMS) shares did Jorn Drappa acquire in the latest Form 4?

Jorn Drappa acquired 26,852 shares of Alumis common stock through option exercises. These came from exercising 15,535 options at $5.06 per share and 11,317 options at $8.84 per share, as disclosed in the Form 4.

Were there any Alumis (ALMS) insider stock sales reported for Jorn Drappa?

No insider stock sales were reported for Jorn Drappa in this Form 4. The filing only shows exercises of stock options that increased his common stock holdings, with no open-market dispositions or tax-withholding share transfers disclosed.

What exercise prices applied to Jorn Drappa’s Alumis (ALMS) stock options?

The exercised Alumis stock options had exercise prices of $5.06 and $8.84 per share. Drappa exercised 15,535 options at $5.06 and 11,317 options at $8.84, converting them into an equal number of common shares on May 22, 2026.

What type of securities did Jorn Drappa exercise in the Alumis (ALMS) Form 4?

Jorn Drappa exercised "Stock Option (Right to Buy)" derivative securities to obtain Alumis common stock. Two option positions were exercised, each converting into common shares at fixed exercise prices, with no remaining option positions listed in this filing’s derivative summary.

Does the Alumis (ALMS) Form 4 mention employee stock purchase plan shares?

Yes, a footnote states that Drappa’s holdings include 1,037 shares acquired on November 20, 2025 and 3,000 shares acquired on May 20, 2026 under Alumis’s 2024 Employee Stock Purchase Plan, providing additional context on how some shares were accumulated.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/27/2026 - 07:06 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Drappa Jorn

(Last) (First) (Middle)

C/O ALUMIS INC.

280 EAST GRAND AVENUE

(Street)

SOUTH SAN FRANCISCO CALIFORNIA 94080

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ALUMIS INC. [ ALMS ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Medical Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/22/2026

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

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/22/2026		M		11,317	A	$8.84	43,804(1)	D
Common Stock	05/22/2026		M		15,535	A	$5.06	59,339	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$8.84	05/22/2026		M			11,317	(2)	08/29/2032	Common Stock	11,317	$0	159,805	D
Stock Option (Right to Buy)	$5.06	05/22/2026		M			15,535	(3)	02/17/2035	Common Stock	15,535	$0	164,465	D

Explanation of Responses:

1. Includes 1,037 shares acquired on November 20, 2025 and 3,000 shares acquired on May 20, 2026 under the Issuer's 2024 Employee Stock Purchase Plan.

2. 25% of the shares underlying this option vested on August 22, 2023, and the remaining shares vest in equal monthly installments thereafter over the following 36 months, subject to acceleration and the Reporting Person's continuous service to the Issuer on each such vesting date.

3. 25% of the shares underlying this option vested on February 18, 2026, and the remaining shares vest in equal monthly installments thereafter over the following 36 months, subject to acceleration and the Reporting Person's continuous service to the Issuer on each such vesting date.

	/s/ Sanam Pangali, Attorney-in-Fact	05/27/2026
	** 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 4 (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 4: SEC 1474 (03-26)