MAK Capital reports 6.7% stake in Standard BioTools

MAK Capital and related entities reported beneficial ownership of 26,172,626 shares of Standard BioTools Inc. common stock, representing 6.7% of the class.

Rhea-AI Filing Summary

MAK Capital and related entities reported beneficial ownership of 26,172,626 shares of Standard BioTools Inc. common stock, representing 6.7% of the class. The filing states the share count is as of 05/15/2026 and references 390,368,119 shares outstanding as of May 4, 2026.

The Schedule 13G/A lists shared voting and dispositive power over the 26,172,626 shares and identifies MAK Capital Fund LP, MAK Capital One L.L.C., and Michael A. Kaufman as reporting persons. Signatures are dated 05/15/2026.

Insights

Governance Analyst

MAK Capital disclosed a passive 6.7% stake in Standard BioTools.

The filing lists 26,172,626 shares beneficially owned as of 05/15/2026 and reports shared voting and dispositive power. The ownership percentage is calculated against 390,368,119 shares outstanding as of May 4, 2026.

Cash‑flow treatment and sale intentions are not disclosed; subsequent SEC filings would show any transactional activity. Voting alignment and any board engagement should be tracked in future disclosures.

Key Figures

Shares beneficially owned: 26,172,626 shares Percent of class: 6.7% Shares outstanding: 390,368,119 shares +1 more

4 metrics

Shares beneficially owned 26,172,626 shares beneficially owned as of <date>05/15/2026</date>

Percent of class 6.7% calculated using 390,368,119 shares outstanding as of <date>May 4, 2026</date>

Shares outstanding 390,368,119 shares outstanding as of <date>May 4, 2026</date>

Filing date / signature date 05/15/2026 signatures dated in Schedule 13G/A

Key Terms

Schedule 13G/A, beneficially owned, shared dispositive power

3 terms

Schedule 13G/A regulatory

"This /A is being filed by: i. MAK Capital Fund LP"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned financial

"26,172,626 shares of Common Stock beneficially owned as of 05/15/2026"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared dispositive power regulatory

"Shared Dispositive Power 26,172,626.00"

FAQ

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

What stake does MAK Capital hold in Standard BioTools (LAB)?

MAK Capital reported ownership of 26,172,626 shares, equal to 6.7% of the class. The filing states the share count is as of 05/15/2026 and uses 390,368,119 shares outstanding as of May 4, 2026 for the percentage calculation.

Which entities and person filed the Schedule 13G/A for LAB?

The filing was made by MAK Capital Fund LP, MAK Capital One L.L.C., and Michael A. Kaufman. Addresses and citizenships are provided; signatures are dated 05/15/2026 and list Mr. Kaufman as Managing Member.

Does the filing show who controls voting or disposition of the shares?

The Schedule 13G/A reports shared voting and shared dispositive power over 26,172,626 shares. Sole voting and dispositive power are reported as zero, indicating the reporting persons state shared authority rather than exclusive control.

What outstanding share count was used to compute the 6.7% figure?

The percent is calculated using 390,368,119 shares outstanding as of May 4, 2026. That outstanding count is cited from the issuer's Form 10-Q filed on May 6, 2026 in the filing's explanatory comment.

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

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Accepted by SEC EDGAR 05/15/2026 - 06:12 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

STANDARD BIOTOOLS INC.

(Name of Issuer)

Common Stock, $0.001 par value per share

(Title of Class of Securities)

34385P108

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

MAK Capital Fund LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

BERMUDA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 26,172,626.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 26,172,626.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

26,172,626.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.7 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: The calculation is based upon 26,172,626 shares of Common Stock beneficially owned as of 05/15/2026 and a total of 390,368,119 shares of Common Stock, $0.001 par value per share, outstanding as of May 4, 2026, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 6, 2026.

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

MAK Capital One L.L.C.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 26,172,626.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 26,172,626.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

26,172,626.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.7 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: The calculation is based upon 26,172,626 shares of Common Stock beneficially owned as of 05/15/2026 and a total of 390,368,119 shares of Common Stock, $0.001 par value per share, outstanding as of May 4, 2026, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 6, 2026.

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Michael A. Kaufman

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 26,172,626.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 26,172,626.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

26,172,626.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.7 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: The calculation is based upon 26,172,626 shares of Common Stock beneficially owned as of 05/15/2026 and a total of 390,368,119 shares of Common Stock, $0.001 par value per share, outstanding as of May 4, 2026, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 6, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: STANDARD BIOTOOLS INC.
(b)	Address of issuer's principal executive offices: 50 MILK STREET, 10th Floor, BOSTON, MASSACHUSETTS, 02109.
Item 2.
(a)	Name of person filing: This Schedule 13G/A is being filed by: i. MAK Capital Fund LP ("MAK Fund") ii. MAK Capital One L.L.C. ("MAK Capital"); and iii. Michael A. Kaufman ("Mr. Kaufman," and collectively with MAK Fund and MAK Capital, the "Reporting Persons")
(b)	Address or principal business office or, if none, residence: The principal business address of (i) MAK Fund is c/o Wakefield Quin, Victoria Place, 31 Victoria Street, Bermuda; and (ii) MAK Capital and Mr. Kaufman is 590 Madison Avenue, 31st Floor, New York, NY 10022.
(c)	Citizenship: MAK Capital Fund LP is a Bermuda limited partnership. MAK Capital One L.L.C. is a Delaware limited liability company. Mr. Kaufman is a United States citizen.
(d)	Title of class of securities: Common Stock, $0.001 par value per share
(e)	CUSIP No.: 34385P108
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:
(a)	Broker or dealer registered under section 15 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). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 26,172,626
(b)	Percent of class: 6.7% The calculation is based upon 26,172,626 shares of Common Stock beneficially owned as of 05/15/2026 and a total of 390,368,119 shares of Common Stock, $0.001 par value per share, outstanding as of May 4, 2026, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 6, 2026.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 26,172,626
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 26,172,626
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

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.

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.

MAK Capital Fund LP

Signature:	/s/ Michael A. Kaufman
Name/Title:	Managing Member
Date:	05/15/2026

MAK Capital One L.L.C.

Signature:	/s/ Michael A. Kaufman
Name/Title:	Managing Member
Date:	05/15/2026

Michael A. Kaufman

Signature:	/s/ Michael A. Kaufman
Name/Title:	Michael A. Kaufman
Date:	05/15/2026