Standard BioTools investor reports 7.3% ownership stake

STANDARD BIOTOOLS INC. received an amended Schedule 13G filing from MAK Capital Fund LP, MAK Capital One LLC, and Michael A. Kaufman, reporting a significant ownership position.

Rhea-AI Filing Summary

STANDARD BIOTOOLS INC. received an amended Schedule 13G filing from MAK Capital Fund LP, MAK Capital One LLC, and Michael A. Kaufman, reporting a significant ownership position. The reporting persons collectively beneficially own 28,813,904 shares of Common Stock, representing 7.3% of the outstanding class.

This percentage is calculated based on 28,813,904 shares beneficially owned as of June 30, 2026, and 392,578,808 shares outstanding as of August 3, 2026. The reporting persons have 0 shares with sole voting or dispositive power and 28,813,904 shares with shared voting and dispositive power, indicating coordinated control over this stake.

Key Figures

Shares beneficially owned: 28,813,904 shares Percent of class: 7.3% Shares outstanding: 392,578,808 shares +3 more

6 metrics

Shares beneficially owned 28,813,904 shares Common Stock beneficially owned as of 06/30/2026 by the reporting persons

Percent of class 7.3% Portion of STANDARD BIOTOOLS INC. Common Stock represented by the reported holdings

Shares outstanding 392,578,808 shares Common Stock outstanding as of August 3, 2026 used for ownership calculation

Shared voting power 28,813,904 shares Number of shares over which the reporting persons share voting power

Sole voting power 0 shares Number of shares over which the reporting persons have sole voting power

Shared dispositive power 28,813,904 shares Number of shares over which the reporting persons share dispositive power

Key Terms

beneficially owned, shared voting power, shared dispositive power, percent of class, +1 more

5 terms

beneficially owned financial

"The calculation is based upon 28,813,904 shares of Common Stock beneficially owned as of 06/30/2026"

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 voting power financial

"Shared Voting Power 28,813,904.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 28,813,904.00"

percent of class financial

"Percent of class: 7.3%"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

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.

FAQ

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

What ownership stake in STANDARD BIOTOOLS INC. (LAB) is reported in this Schedule 13G/A?

The reporting group holds a 7.3% stake in STANDARD BIOTOOLS INC., representing 28,813,904 shares of Common Stock, based on 392,578,808 shares outstanding as of August 3, 2026.

Who are the reporting persons in the STANDARD BIOTOOLS INC. (LAB) Schedule 13G/A?

The filing is submitted by MAK Capital Fund LP, MAK Capital One LLC, and Michael A. Kaufman, who are collectively referred to as the reporting persons and share voting and dispositive power over the reported shares.

How many STANDARD BIOTOOLS INC. (LAB) shares have shared voting power?

The reporting persons have shared voting power over 28,813,904 shares of STANDARD BIOTOOLS INC. Common Stock and no sole voting power, reflecting coordinated control over this entire reported position.

What is the share count used to calculate the 7.3% ownership of LAB?

The 7.3% ownership is based on 28,813,904 shares beneficially owned and a total of 392,578,808 shares of Common Stock outstanding as of August 3, 2026, as reported by the issuer.

Does MAK Capital report sole or shared dispositive power over STANDARD BIOTOOLS (LAB) shares?

The reporting persons disclose 0 shares with sole dispositive power and 28,813,904 shares with shared dispositive power, meaning decisions to sell or otherwise dispose are held jointly rather than individually.

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

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Available on EDGAR 08/14/2026 - 04:41 PM Accepted by SEC EDGAR 08/14/2026 - 04:37 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. 2)

STANDARD BIOTOOLS INC.

(Name of Issuer)

Common Stock, $0.001 par value per share

(Title of Class of Securities)

34385P108

(CUSIP Number)

06/30/2026

(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 ONE LLC

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 28,813,904.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 28,813,904.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

28,813,904.00

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)

7.3 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: The calculation is based upon 28,813,904 shares of Common Stock beneficially owned as of 06/30/2026 and a total of 392,578,808 shares of Common Stock, $0.001 par value per share, outstanding as of August 3, 2026, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 5, 2026.

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 28,813,904.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 28,813,904.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

28,813,904.00

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)

7.3 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: The calculation is based upon 28,813,904 shares of Common Stock beneficially owned as of 06/30/2026 and a total of 392,578,808 shares of Common Stock, $0.001 par value per share, outstanding as of August 3, 2026, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 5, 2026.

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Kaufman Michael A

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 28,813,904.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 28,813,904.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

28,813,904.00

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)

7.3 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: The calculation is based upon 28,813,904 shares of Common Stock beneficially owned as of 06/30/2026 and a total of 392,578,808 shares of Common Stock, $0.001 par value per share, outstanding as of August 3, 2026, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 5, 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: 28,813,904
(b)	Percent of class: 7.3% The calculation is based upon 28,813,904 shares of Common Stock beneficially owned as of 06/30/2026 and a total of 392,578,808 shares of Common Stock, $0.001 par value per share, outstanding as of August 3, 2026, as reported by the Issuer on its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 5, 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: 28,813,904
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 28,813,904
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 ONE LLC

Signature:	/s/ Michael A. Kaufman
Name/Title:	Managing Member
Date:	08/14/2026

MAK Capital Fund LP

Signature:	/s/ Michael A. Kaufman
Name/Title:	Managing Member
Date:	08/14/2026

Kaufman Michael A

Signature:	/s/ Michael A. Kaufman
Name/Title:	Michael A. Kaufman
Date:	08/14/2026