Viking Global (LAB) holds 58.65M shares (~15%) of Standard BioTools

Rhea-AI Filing Summary

Standard BioTools Amendment No. 2 to a Schedule 13G/A: Viking Global Investors and affiliated entities report beneficial ownership of 58,651,170 shares of Common Stock. The filing states this represents 15.0% of 390,141,000 shares outstanding as of March 31, 2026. The amendment removes David C. Ott as a reporting person effective March 31, 2026.

The disclosure breaks the position into 39,296,310 shares held through Viking Global Opportunities (VGOP) and 19,354,860 shares held through Viking Global Opportunities Drawdown (VGOD), and shows shared voting and dispositive power across the listed Viking entities and two executive committee members.

Key Figures

Aggregate beneficial ownership: 58,651,170 shares VGOP direct holdings: 39,296,310 shares VGOD direct holdings: 19,354,860 shares +2 more

5 metrics

Aggregate beneficial ownership 58,651,170 shares aggregate held by VGI and affiliates

VGOP direct holdings 39,296,310 shares directly owned by VGOP

VGOD direct holdings 19,354,860 shares directly owned by VGOD

Percent of class 15.0% based on 390,141,000 shares outstanding as of March 31, 2026

Shares outstanding anchor 390,141,000 shares shares outstanding as of March 31, 2026 per issuer 10-Q

Key Terms

beneficially own, shared dispositive power, Rule 13d-3, Schedule 13G/A amendment

4 terms

beneficially own regulatory

"VGI beneficially owns 58,651,170 shares of Common Stock"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

shared dispositive power regulatory

"Shared Dispositive Power 58,651,170.00"

Rule 13d-3 regulatory

"Based on Rule 13d-3 under the Act, VGI may be deemed to beneficially own"

Rule 13d-3 defines who is treated as the beneficial owner of a company’s shares for U.S. securities disclosure rules — essentially anyone who has the power to vote or direct how shares are voted, or the power to buy or sell them, even if they don’t hold the certificates. For investors this matters because crossing certain ownership thresholds triggers public filing and disclosure obligations and signals potential control or influence, much like having the keys to a car implies you can drive it even if it’s registered to someone else.

Schedule 13G/A amendment regulatory

"Amendment No. 2 to a Schedule 13G/A is being filed to remove Mr. Ott"

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)

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

VIKING GLOBAL INVESTORS 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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 58,651,170.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 58,651,170.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

58,651,170.00

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)

15 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Viking Global Opportunities Parent GP 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 58,651,170.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 58,651,170.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

58,651,170.00

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)

15 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Viking Global Opportunities GP 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 39,296,310.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 39,296,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

39,296,310.00

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)

10.1 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Viking Global Opportunities Portfolio GP 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 39,296,310.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 39,296,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

39,296,310.00

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)

10.1 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Viking Global Opportunities Illiquid Investments Sub-Master 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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 39,296,310.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 39,296,310.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

39,296,310.00

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)

10.1 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Viking Global Opportunities Drawdown GP 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 19,354,860.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 19,354,860.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

19,354,860.00

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)

5 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Viking Global Opportunities Drawdown Portfolio GP 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 19,354,860.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 19,354,860.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

19,354,860.00

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)

5 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Viking Global Opportunities Drawdown (Aggregator) 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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 19,354,860.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 19,354,860.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

19,354,860.00

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)

5 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

HALVORSEN OLE ANDREAS

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

NORWAY

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 58,651,170.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 58,651,170.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

58,651,170.00

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)

15 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: See Item 4

SCHEDULE 13G

CUSIP Number(s): 34385P108

1

Names of Reporting Persons

Shabet Rose Sharon

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 58,651,170.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 58,651,170.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

58,651,170.00

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)

15 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: See Item 4

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, MA 02109
Item 2.
(a)	Name of person filing: Viking Global Investors LP ("VGI"), Viking Global Opportunities Parent GP LLC ("Opportunities Parent"), Viking Global Opportunities GP LLC ("Opportunities GP"), Viking Global Opportunities Portfolio GP LLC ("Opportunities Portfolio GP"), Viking Global Opportunities Illiquid Investments Sub-Master LP ("VGOP"), Viking Global Opportunities Drawdown GP LLC ("VGOD GP"), Viking Global Opportunities Drawdown Portfolio GP LLC ("VGOD Portfolio GP"), Viking Global Opportunities Drawdown (Aggregator) LP ("VGOD"), O. Andreas Halvorsen and Rose S. Shabet (collectively, the "Reporting Persons") Effective March 31, 2026, David C. Ott ("Mr. Ott") retired from his roles as Advisory Director of VGI and Executive Committee Member of each of Viking Global Partners LLC (the general partner of VGI) and Opportunities Parent. Accordingly, this Amendment No. 2 is being filed to remove Mr. Ott as a Reporting Person from this Schedule 13G, as Mr. Ott is no longer a beneficial owner of any of the shares of Common Stock reported herein.
(b)	Address or principal business office or, if none, residence: The business address of each of the Reporting Persons is: 600 Washington Boulevard, Floor 11, Stamford, Connecticut 06901.
(c)	Citizenship: VGI is a Delaware limited partnership; Opportunities Parent, Opportunities GP, Opportunities Portfolio GP, VGOD GP and VGOD Portfolio GP are Delaware limited liability companies; VGOP and VGOD are Cayman Islands exempted limited partnerships; O. Andreas Halvorsen is a citizen of Norway; and Rose S. Shabet is a citizen of the United States.
(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: VGI: 58,651,170 VGI provides managerial services to VGOP and VGOD. VGI has the authority to dispose of and vote the shares of Common Stock that VGOP and VGOD directly own. VGI does not directly own any shares of Common Stock. Based on Rule 13d-3 under the Securities Exchange Act of 1934, as amended (the "Act"), VGI may be deemed to beneficially own the shares of Common Stock that VGOP and VGOD directly own. VGI beneficially owns 58,651,170 shares of Common Stock consisting of (i) 39,296,310 shares of Common Stock directly owned by VGOP and (ii) 19,354,860 shares of Common Stock directly owned by VGOD. Opportunities Parent: 58,651,170 Opportunities Parent is the sole member of Opportunities GP, which has the authority to dispose of and vote the shares of Common Stock controlled by Opportunities Portfolio GP (which consists of the shares of Common Stock that VGOP directly owns), and is the sole member of VGOD GP, which has the authority to dispose of and vote the shares of Common Stock controlled by VGOD Portfolio GP (which consists of the shares of Common Stock that VGOD directly owns). Opportunities Parent does not directly own any shares of Common Stock. Based on Rule 13d-3 under the Act, Opportunities Parent may be deemed to beneficially own the shares of Common Stock that VGOP and VGOD directly own. Opportunities Parent beneficially owns 58,651,170 shares of Common Stock consisting of (i) 39,296,310 shares of Common Stock directly owned by VGOP and (ii) 19,354,860 shares of Common Stock directly owned by VGOD. Opportunities GP: 39,296,310 Opportunities GP serves as the sole member of Opportunities Portfolio GP and has the authority to dispose of and vote the shares of Common Stock controlled by Opportunities Portfolio GP, which consists of the shares of Common Stock that VGOP directly owns. In addition, Opportunities GP is the general partner of each of Viking Global Opportunities Intermediate LP, Viking Global Opportunities III LP, and Viking Global Opportunities LP. Opportunities GP does not directly own any shares of Common Stock. Based on Rule 13d-3 under the Act, Opportunities GP may be deemed to beneficially own the shares of Common Stock that VGOP directly owns. Opportunities GP beneficially owns 39,296,310 shares of Common Stock consisting of 39,296,310 shares of Common Stock directly owned by VGOP. Opportunities Portfolio GP: 39,296,310 Opportunities Portfolio GP serves as the general partner of VGOP and has the authority to dispose of and vote the shares of Common Stock that VGOP directly owns. Opportunities Portfolio GP does not directly own any shares of Common Stock. Based on Rule 13d-3 under the Act, Opportunities Portfolio GP may be deemed to beneficially own the shares of Common Stock that VGOP directly owns. Opportunities Portfolio GP beneficially owns 39,296,310 shares of Common Stock consisting of 39,296,310 shares of Common Stock directly owned by VGOP. VGOP: 39,296,310 VGOP has the authority to dispose of and vote the shares of Common Stock that it directly owns, which power may be exercised by its general partner, Opportunities Portfolio GP, and by VGI, an affiliate of Opportunities Portfolio GP, which provides managerial services to VGOP. Viking Global Opportunities LP (a Delaware limited partnership) and Viking Global Opportunities III LP (a Cayman Islands exempted limited partnership), through its investment in Viking Global Opportunities Intermediate LP (a Cayman Islands exempted limited partnership), invest substantially all of their assets in Viking Global Opportunities Master LP (a Cayman Islands exempted limited partnership), which in turn invests through VGOP. VGOD GP: 19,354,860 VGOD GP serves as the sole member of VGOD Portfolio GP and has the authority to dispose of and vote the shares of Common Stock controlled by VGOD Portfolio GP, which consists of the shares of Common Stock that VGOD directly owns. In addition, VGOD GP is the general partner of each of Viking Global Opportunities Drawdown (Onshore) LP and Viking Global Opportunities Drawdown (Offshore) LP. VGOD GP does not directly own any shares of Common Stock. Based on Rule 13d-3 under the Act, VGOD GP may be deemed to beneficially own the shares of Common Stock that VGOD directly owns. VGOD GP beneficially owns 19,354,860 shares of Common Stock consisting of 19,354,860 shares of Common Stock directly owned by VGOD. VGOD Portfolio GP: 19,354,860 VGOD Portfolio GP serves as the general partner of VGOD and has the authority to dispose of and vote the shares of Common Stock that VGOD directly owns. VGOD Portfolio GP does not directly own any shares of Common Stock. Based on Rule 13d-3 under the Act, VGOD Portfolio GP may be deemed to beneficially own the shares of Common Stock that VGOD directly owns. VGOD Portfolio GP beneficially owns 19,354,860 shares of Common Stock consisting of 19,354,860 shares of Common Stock directly owned by VGOD. VGOD: 19,354,860 VGOD has the authority to dispose of and vote the 19,354,860 shares of Common Stock that it directly owns, which power may be exercised by its general partner, VGOD Portfolio GP, and by VGI, an affiliate of VGOD Portfolio GP, which provides managerial services to VGOD. Viking Global Opportunities Drawdown (Offshore) LP (a Cayman Islands exempted limited partnership) and Viking Global Opportunities Drawdown (Onshore) LP (a Delaware limited partnership) invest substantially all of their assets in VGOD. O. Andreas Halvorsen and Rose S. Shabet: 58,651,170 Mr. Halvorsen and Ms. Shabet, as Executive Committee Members of Viking Global Partners LLC (general partner of VGI) and Opportunities Parent, have shared authority to dispose of and vote the shares of Common Stock beneficially owned by VGI and Opportunities Parent. Neither Mr. Halvorsen nor Ms. Shabet directly owns any shares of Common Stock. Based on Rule 13d-3 under the Act, each may be deemed to beneficially own the shares of Common Stock that VGOP and VGOD directly own. Mr. Halvorsen and Ms. Shabet each beneficially own 58,651,170 shares of Common Stock consisting of 39,296,310 shares of Common Stock directly owned by VGOP and 19,354,860 shares of Common Stock directly owned by VGOD.
(b)	Percent of class: The percentages set forth herein are based on 390,141,000 shares of Common Stock outstanding as of March 31, 2026, as reported in the Issuer's quarterly report on Form 10-Q, filed with the Securities and Exchange Commission (the "Commission") on May 6, 2026. VGI: 15.0% Opportunities Parent: 15.0% Opportunities GP: 10.1% Opportunities Portfolio GP: 10.1% VGOP: 10.1% VGOD GP: 5.0% VGOD Portfolio GP: 5.0% VGOD: 5.0% O. Andreas Halvorsen and Rose S. Shabet: 15.0%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: VGI: 0 Opportunities Parent: 0 Opportunities GP: 0 Opportunities Portfolio GP: 0 VGOP: 0 VGOD GP: 0 VGOD Portfolio GP: 0 VGOD: 0 O. Andreas Halvorsen and Rose S. Shabet: 0
	(ii) Shared power to vote or to direct the vote: VGI: 58,651,170 Opportunities Parent: 58,651,170 Opportunities GP: 39,296,310 Opportunities Portfolio GP: 39,296,310 VGOP: 39,296,310 VGOD GP: 19,354,860 VGOD Portfolio GP: 19,354,860 VGOD: 19,354,860 O. Andreas Halvorsen and Rose S. Shabet: 58,651,170
	(iii) Sole power to dispose or to direct the disposition of: VGI: 0 Opportunities Parent: 0 Opportunities GP: 0 Opportunities Portfolio GP: 0 VGOP: 0 VGOD GP: 0 VGOD Portfolio GP: 0 VGOD: 0 O. Andreas Halvorsen and Rose S. Shabet: 0
	(iv) Shared power to dispose or to direct the disposition of: VGI: 58,651,170 Opportunities Parent: 58,651,170 Opportunities GP: 39,296,310 Opportunities Portfolio GP: 39,296,310 VGOP: 39,296,310 VGOD GP: 19,354,860 VGOD Portfolio GP: 19,354,860 VGOD: 19,354,860 O. Andreas Halvorsen and Rose S. Shabet: 58,651,170
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.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The response to Item 4 is incorporated by reference herein.
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.

VIKING GLOBAL INVESTORS LP

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of VIKING GLOBAL INVESTORS LP (1)(2)
Date:	05/15/2026

Viking Global Opportunities Parent GP LLC

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of Viking Global Opportunities Parent GP LLC (1)(2)
Date:	05/15/2026

Viking Global Opportunities GP LLC

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of Viking Global Opportunities GP LLC (1)(2)
Date:	05/15/2026

Viking Global Opportunities Portfolio GP LLC

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of Viking Global Opportunities Portfolio GP LLC (1)(2)
Date:	05/15/2026

Viking Global Opportunities Illiquid Investments Sub-Master LP

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of Viking Global Opportunities Illiquid Investments Sub-Master LP (1)(2)
Date:	05/15/2026

Viking Global Opportunities Drawdown GP LLC

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of Viking Global Opportunities Drawdown GP LLC (1)(2)
Date:	05/15/2026

Viking Global Opportunities Drawdown Portfolio GP LLC

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of Viking Global Opportunities Drawdown Portfolio GP LLC (1)(2)
Date:	05/15/2026

Viking Global Opportunities Drawdown (Aggregator) LP

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of Viking Global Opportunities Drawdown (Aggregator) LP (1)(2)
Date:	05/15/2026

HALVORSEN OLE ANDREAS

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of O. Andreas Halvorsen (1)
Date:	05/15/2026

Shabet Rose Sharon

Signature:	/s/ Scott M. Hendler
Name/Title:	Scott M. Hendler on behalf of Rose S. Shabet (2)
Date:	05/15/2026

Comments accompanying signature: (1) Scott M. Hendler is signing on behalf of O. Andreas Halvorsen, individually and as an Executive Committee Member of VIKING GLOBAL PARTNERS LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as an Executive Committee Member of VIKING GLOBAL OPPORTUNITIES PARENT GP LLC, on behalf of itself and VIKING GLOBAL OPPORTUNITIES GP LLC, VIKING GLOBAL OPPORTUNITIES PORTFOLIO GP LLC, VIKING GLOBAL OPPORTUNITIES ILLIQUID INVESTMENTS SUB-MASTER LP, VIKING GLOBAL OPPORTUNITIES DRAWDOWN GP LLC, VIKING GLOBAL OPPORTUNITIES DRAWDOWN PORTFOLIO GP LLC and VIKING GLOBAL OPPORTUNITIES DRAWDOWN (AGGREGATOR) LP, pursuant to an authorization and designation letter dated February 9, 2021, which was previously filed with the Commission as an exhibit to a Form 13G filed by Mr. Halvorsen on February 12, 2021 (SEC File No. 005-49737). (2) Scott M. Hendler is signing on behalf of Rose S. Shabet, individually and as an Executive Committee Member of VIKING GLOBAL PARTNERS LLC, on behalf of VIKING GLOBAL INVESTORS LP, and as an Executive Committee Member of VIKING GLOBAL OPPORTUNITIES PARENT GP LLC, on behalf of itself and VIKING GLOBAL OPPORTUNITIES GP LLC, VIKING GLOBAL OPPORTUNITIES PORTFOLIO GP LLC, VIKING GLOBAL OPPORTUNITIES ILLIQUID INVESTMENTS SUB-MASTER LP, VIKING GLOBAL OPPORTUNITIES DRAWDOWN GP LLC, VIKING GLOBAL OPPORTUNITIES DRAWDOWN PORTFOLIO GP LLC and VIKING GLOBAL OPPORTUNITIES DRAWDOWN (AGGREGATOR) LP, pursuant to an authorization and designation letter dated February 9, 2021, which was previously filed with the Commission as an exhibit to a Form 13G filed by Mr. Halvorsen on February 12, 2021 (SEC File No. 005-49737).

Exhibit Information

EXHIBIT A - JOINT FILING AGREEMENT

FAQ

What stake does Viking Global report in Standard BioTools (LAB)?

Viking Global and affiliates report beneficial ownership of 58,651,170 shares, equal to 15.0% of the company's 390,141,000 shares outstanding as of March 31, 2026. The holdings are split between VGOP and VGOD entities.

How are the 58,651,170 shares allocated among Viking entities?

The filing shows 39,296,310 shares directly owned by VGOP and 19,354,860 shares directly owned by VGOD, with VGI and related GPs deemed to beneficially own the aggregate 58,651,170 shares under Rule 13d-3.

Does anyone retain sole voting or dispositive power over these shares?

No reporting person claims sole voting or sole dispositive power; the filing lists 0 shares as sole power and 58,651,170 as shared voting and dispositive power for VGI and related reporting persons.

Why was an amendment filed on this Schedule 13G/A?

The amendment removes David C. Ott as a reporting person effective March 31, 2026, stating he retired and is no longer a beneficial owner of any reported shares; signatures are dated May 15, 2026.

What is the ownership percentage basis used in the filing?

Percentages are calculated using 390,141,000 shares outstanding as of March 31, 2026, reported in the issuer's Form 10-Q referenced in the filing; Viking's aggregate stake is listed as 15.0%.