Samsara boosts Alumis (ALMS) stake, details $15.2M share purchases

Rhea-AI Filing Summary

Alumis Inc. received an updated ownership report from investment entities affiliated with Srinivas Akkaraju. Samsara BioCapital, L.P. reports beneficial ownership of 4,491,731 shares of Alumis common stock, representing 3.8% of the class, while Samsara Opportunity Fund, L.P. reports 1,853,488 shares, or 1.6%. Dr. Akkaraju is reported to beneficially own 6,345,219 shares in total, equal to 5.4% of Alumis' voting common stock.

The filing details a series of open-market purchases by Samsara Opportunity Fund between late November and early December 2025 at prices generally between about $7.31 and $11.005 per share, plus a purchase of 588,235 shares at $17.00 per share in Alumis' January 2026 public offering. The aggregate purchase price for these securities from November 26, 2025 through January 9, 2026 was $15,209,937.96.

Insights

Equity ownership and filings analyst

Samsara-affiliated funds disclose a modestly increased stake in Alumis through open-market and offering purchases.

The report shows Samsara BioCapital, L.P. holding 4,491,731 Alumis common shares (3.8% of the class) and Samsara Opportunity Fund, L.P. holding 1,853,488 shares (1.6%). Through control of the general partners, Srinivas Akkaraju is reported to beneficially own 6,345,219 shares, or 5.4% of Alumis' voting common stock. These percentages are calculated against 97,208,495 shares outstanding as of November 6, 2025 plus 20,297,500 new shares issued in a January 2026 offering.

The amendment details recent buying activity by Samsara Opportunity Fund, including multiple open-market purchases between November 26, 2025 and December 5, 2025 at prices generally in the high single to low double digits, and a block of 588,235 shares at $17.00 per share in the January 2026 offering. In total, purchases over this period cost $15,209,937.96, funded via capital contributions from partners. The disclosure clarifies current ownership structure and control but does not itself indicate any stated change in strategic intentions.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

ALUMIS INC.

(Name of Issuer)

Common Stock, $0.0001 par value per share

(Title of Class of Securities)

022307102

(CUSIP Number)

Abrar Hussain
Samsara BioCapital GP, LLC, 628 Middlefield Road
Palo Alto, CA, 94301
(650) 285-4270

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

01/09/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

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 ("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).

SCHEDULE 13D

CUSIP No. 022307102

1

Name of reporting person

Samsara BioCapital, L.P.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 4,491,731.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 4,491,731.00

11

Aggregate amount beneficially owned by each reporting person

4,491,731.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

3.8 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP No. 022307102

1

Name of reporting person

Samsara BioCapital GP, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 4,491,731.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 4,491,731.00

11

Aggregate amount beneficially owned by each reporting person

4,491,731.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

3.8 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP No. 022307102

1

Name of reporting person

Samsara Opportunity Fund, L.P.

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

WC

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,853,488.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,853,488.00

11

Aggregate amount beneficially owned by each reporting person

1,853,488.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

1.6 %

14

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13D

CUSIP No. 022307102

1

Name of reporting person

Samsara Opportunity Fund GP, LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,853,488.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,853,488.00

11

Aggregate amount beneficially owned by each reporting person

1,853,488.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

1.6 %

14

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13D

CUSIP No. 022307102

1

Name of reporting person

Srinivas Akkaraju

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

AF

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 6,345,219.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 6,345,219.00

11

Aggregate amount beneficially owned by each reporting person

6,345,219.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

5.4 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock, $0.0001 par value per share
(b)	Name of Issuer: ALUMIS INC.
(c)	Address of Issuer's Principal Executive Offices: 280 East Grand Avenue, South San Francisco, CALIFORNIA , 94080.
Item 1 Comment: This Amendment No. 1 (this "Amendment No. 1" or this "Schedule 13D/A") amends and supplements the statement on Schedule 13D originally filed with the Securities and Exchange Commission (the "SEC") on November 24, 2025 (the "Statement") by the Reporting Persons. Unless otherwise defined herein, capitalized terms used in this Amendment No. 1 shall have the meanings ascribed to them in the Statement. Unless amended or supplemented below, the information in the Statement remains unchanged.
Item 3.	Source and Amount of Funds or Other Consideration
	Item 3 of the Statement is hereby amended and supplemented as follows: On November 26, 2025, Samsara Opportunity Fund purchased 48,537 shares of voting common stock at prices ranging from $7.46 to $7.74 and a weighted-average price of $7.64 per share through open market purchases. On November 28, 2025, Samsara Opportunity Fund purchased 38,702 shares of voting common stock at prices ranging from $7.56 to $7.73 and a weighted-average price of $7.64 per share through open market purchases. On December 1, 2025, Samsara Opportunity Fund purchased 86,350 shares of voting common stock at prices ranging from $7.31 to $7.84 and a weighted-average price of $7.46 per share through open market purchases. On December 2, 2025, Samsara Opportunity Fund purchased 96,000 shares of voting common stock at prices ranging from $7.41 to $7.92 and a weighted-average price of $7.55 per share through open market purchases. On December 3, 2025, Samsara Opportunity Fund purchased 100,000 shares of voting common stock at prices ranging from $7.41 to $7.96 and a weighted-average price of $7.75 per share through open market purchases. On December 4, 2025, Samsara Opportunity Fund purchased 66,027 shares of voting common stock at prices ranging from $7.65 to $8.41 and a weighted-average price of $8.18 per share through open market purchases. On December 5, 2025, Samsara Opportunity Fund purchased the following shares of voting common stock in open market transactions: - 64,969 shares at prices ranging from $8.48 to $9.4793 per share (a weighted-average price of $8.95 per share); - 70,028 shares at prices ranging from $9.48 to $10.47 per share (a weighted-average price of $10.01 per share); and - 51,380 shares at prices ranging from $10.48 to $11.005 per share (a weighted-average price of $10.73 per share). On January 9, 2026, Samsara Opportunity Fund purchased 588,235 shares of voting common stock at a price of $17.00 per share from the underwriters of the Issuer's public offering (the "January 2026 Offering"). The aggregate purchase price for all securities acquired by Samsara Opportunity Fund from November 26, 2025 through January 9, 2026 was $15,209,937.96. Samsara Opportunity Fund funded its purchase of the foregoing securities from capital contributions from its general and limited partners.
Item 5.	Interest in Securities of the Issuer
(a)	Rows 11 and 13 of each Reporting Person's cover page to this Schedule 13D/A set forth the aggregate number of shares of voting common stock and percentages of the shares of voting common stock beneficially owned by such Reporting Person and are incorporated by reference. The percentage set forth in each row 13 is based upon the sum of (i) 97,208,495 shares of voting common stock outstanding as of November 6, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on November 13, 2025 and (ii) 20,297,500 shares of voting common stock issued in the January 2026 Offering, as reported in the Issuer's Current Report on Form 8-K filed with the SEC on January 9, 2026. The Reporting Persons' beneficial ownership of the Issuer's securities consists of (i) 4,491,731 shares of voting common stock directly held by Samsara LP; and (ii) 1,853,488 shares of voting common stock directly held by Samsara Opportunity Fund. Samsara GP is the sole general partner of Samsara LP and Dr. Akkaraju is the managing member of Samsara GP. Each of Samsara GP and Dr. Akkaraju possesses power to direct the voting and disposition of the securities held by Samsara LP. Samsara Opportunity GP is the sole general partner of Samsara Opportunity Fund and Dr. Akkaraju is the managing member of Samsara Opportunity GP. Each of Samsara Opportunity GP and Dr. Akkaraju possesses power to direct the voting and disposition of the securities held by Samsara Opportunity Fund.
(b)	Rows 7 through 10 of each Reporting Person's cover page to this Schedule 13D/A set forth the number of shares of voting common stock as to which such Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition and are incorporated by reference.
(c)	Except as set forth herein, none of the Reporting Persons has effected any transactions with respect to the securities of the Issuer since the filing of the Statement.
(d)	No other person is known to have the right to receive or the power to direct the receipt of dividends from, or any proceeds from the sale of, the securities beneficially owned by any of the Reporting Persons.
(e)	Not applicable.
Item 7.	Material to be Filed as Exhibits.
	Exhibit 99.1 Joint Filing Agreement (incorporated by reference to Exhibit 99.1 to the Reporting Persons' Schedule 13D filed with the SEC on November 24, 2025).

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Samsara BioCapital, L.P.

Signature:	/s/ Srinivas Akkaraju
Name/Title:	By Samsara BioCapital GP, LLC, its General Partner, By Srinivas Akkaraju, Managing Member
Date:	01/13/2026

Samsara BioCapital GP, LLC

Signature:	/s/ Srinivas Akkaraju
Name/Title:	By Srinivas Akkaraju, Managing Member
Date:	01/13/2026

Samsara Opportunity Fund, L.P.

Signature:	/s/ Srinivas Akkaraju
Name/Title:	By Samsara Opportunity Fund GP, LLC, its General Partner, By Srinivas Akkaraju, Managing Member
Date:	01/13/2026

Samsara Opportunity Fund GP, LLC

Signature:	/s/ Srinivas Akkaraju
Name/Title:	By Srinivas Akkaraju, Managing Member
Date:	01/13/2026

Srinivas Akkaraju

Signature:	/s/ Srinivas Akkaraju
Name/Title:	Srinivas Akkaraju
Date:	01/13/2026

FAQ

How many Alumis (ALMS) shares does Samsara BioCapital, L.P. beneficially own?

Samsara BioCapital, L.P. beneficially owns 4,491,731 shares of Alumis voting common stock, representing 3.8% of the outstanding class based on the share counts cited.

What is Samsara Opportunity Fund, L.P.'s ownership stake in Alumis (ALMS)?

Samsara Opportunity Fund, L.P. beneficially owns 1,853,488 Alumis voting common shares, which the report states is 1.6% of the class under the referenced share count assumptions.

What total Alumis (ALMS) stake is attributed to Srinivas Akkaraju in this Schedule 13D/A?

Through control of the relevant general partners, Srinivas Akkaraju is reported to beneficially own 6,345,219 shares of Alumis voting common stock, or 5.4% of the outstanding class.

What Alumis (ALMS) share purchases did Samsara Opportunity Fund make in late 2025 and early 2026?

From November 26, 2025 through December 5, 2025, Samsara Opportunity Fund made multiple open-market purchases at prices ranging from about $7.31 to $11.005 per share, and on January 9, 2026 it bought 588,235 shares at $17.00 per share in Alumis' public offering.

What was the aggregate cost of Samsara Opportunity Fund's recent Alumis (ALMS) share purchases?

The aggregate purchase price for all Alumis securities acquired by Samsara Opportunity Fund from November 26, 2025 through January 9, 2026 was $15,209,937.96, funded by capital contributions from its general and limited partners.

How were the ownership percentages in the Alumis (ALMS) Schedule 13D/A calculated?

The percentages are based on 97,208,495 Alumis voting common shares outstanding as of November 6, 2025, plus 20,297,500 additional shares issued in the January 2026 offering, as cited from Alumis' Form 10-Q and Form 8-K.