# EDGAR Filing Document

**Accession Number:** 0001103804
**File Stem:** 0000905148-26-002940
**Filing Date:** 2026-6
**Character Count:** 39005
**Document Hash:** 92548389c448a3a8dc5ddd7e53a5c694
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000905148-26-002940.hdr.sgml**: 20260612

**ACCESSION NUMBER**: 0000905148-26-002940

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260612

**DATE AS OF CHANGE**: 20260612

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** STANDARD BIOTOOLS INC.
- **CENTRAL INDEX KEY:** 0001162194
- **STANDARD INDUSTRIAL CLASSIFICATION:** LABORATORY ANALYTICAL INSTRUMENTS [3826]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 770513190
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-86635
- **FILM NUMBER:** 261088153

**BUSINESS ADDRESS:**
- **STREET 1:** 50 MILK STREET
- **STREET 2:** 10TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 6502666000

**MAIL ADDRESS:**
- **STREET 1:** 50 MILK STREET
- **STREET 2:** 10TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FLUIDIGM CORP
- **DATE OF NAME CHANGE:** 20011113
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** VIKING GLOBAL INVESTORS LP
- **CENTRAL INDEX KEY:** 0001103804

**ORGANIZATION NAME:**
- **EIN:** 134055118
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D

**BUSINESS ADDRESS:**
- **STREET 1:** 600 WASHINGTON BLVD.
- **STREET 2:** FLOOR 11
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06901
- **BUSINESS PHONE:** 212-672-7050

**MAIL ADDRESS:**
- **STREET 1:** 600 WASHINGTON BLVD.
- **STREET 2:** FLOOR 11
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06901

## Ex-99

**EXHIBIT 1 - JOINT FILING AGREEMENT**

This joint filing agreement is made and entered into as of this 12th day of June, 2026, by and among Viking Global Investors LP, Viking Global Opportunities Parent GP LLC, 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, Viking Global Opportunities Drawdown (Aggregator) LP, O. Andreas Halvorsen and Rose S. Shabet.

The parties to this Agreement hereby agree to prepare jointly and file timely (and otherwise to deliver as appropriate) all filings on any Forms 3, 4, or 5 or Schedules 13D or 13G, and any and all amendments thereto and any other documents relating thereto (collectively, the "Filings") as required to be filed pursuant to the Securities Exchange Act of 1934, as amended. The parties to this Agreement further agree and covenant that each will fully cooperate with such other parties in the preparation, timely filing, and delivery of all such Filings.

IN WITNESS WHEREOF, the parties hereto have executed this agreement as of the date first set forth above.

Dated: June 12, 2026

---

| | |
|:---|:---|
| By:  | /s/ Scott M. Hendler  |
| Name:  | Scott M. Hendler on behalf of O. Andreas Halvorsen (1)  |
| By:  | /s/ Scott M. Hendler  |
| Name:  | Scott M. Hendler on behalf of Rose S. Shabet (2)  |

---

(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).

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**STANDARD BIOTOOLS INC.**

*(Name of Issuer)*

**Common Stock, par value $0.001 per share**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Matthew Bloom**<br>General Counsel<br>600 Washington Boulevard, Floor 11<br>Stamford CT 06901<br>(212) 672-7059

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

**06/06/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**VIKING GLOBAL INVESTORS LP** | Name of reporting person<br>**VIKING GLOBAL INVESTORS LP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**58651170.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**58651170.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**58651170.00** | Aggregate amount beneficially owned by each reporting person<br>**58651170.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**15%** | Percent of class represented by amount in Row (11)<br>**15%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

**Comment for Reporting Person:** All share percentage calculations in this Schedule 13D are based on 390,368,119 shares of Common Stock outstanding as of May 4, 2026, as reported in the Issuer's quarterly report on Form 10-Q filed with the Securities and Exchange Commission on May 6, 2026.

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Viking Global Opportunities Parent GP LLC** | Name of reporting person<br>**Viking Global Opportunities Parent GP LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**58651170.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**58651170.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**58651170.00** | Aggregate amount beneficially owned by each reporting person<br>**58651170.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**15%** | Percent of class represented by amount in Row (11)<br>**15%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Viking Global Opportunities GP LLC** | Name of reporting person<br>**Viking Global Opportunities GP LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**39296310.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**39296310.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**39296310.00** | Aggregate amount beneficially owned by each reporting person<br>**39296310.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**10.1%** | Percent of class represented by amount in Row (11)<br>**10.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Viking Global Opportunities Portfolio GP LLC** | Name of reporting person<br>**Viking Global Opportunities Portfolio GP LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**39296310.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**39296310.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**39296310.00** | Aggregate amount beneficially owned by each reporting person<br>**39296310.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**10.1%** | Percent of class represented by amount in Row (11)<br>**10.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Viking Global Opportunities Illiquid Investments Sub-Master LP** | Name of reporting person<br>**Viking Global Opportunities Illiquid Investments Sub-Master LP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**39296310.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**39296310.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**39296310.00** | Aggregate amount beneficially owned by each reporting person<br>**39296310.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**10.1%** | Percent of class represented by amount in Row (11)<br>**10.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Viking Global Opportunities Drawdown GP LLC** | Name of reporting person<br>**Viking Global Opportunities Drawdown GP LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**19354860.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**19354860.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**19354860.00** | Aggregate amount beneficially owned by each reporting person<br>**19354860.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**5%** | Percent of class represented by amount in Row (11)<br>**5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Viking Global Opportunities Drawdown Portfolio GP LLC** | Name of reporting person<br>**Viking Global Opportunities Drawdown Portfolio GP LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**19354860.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**19354860.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**19354860.00** | Aggregate amount beneficially owned by each reporting person<br>**19354860.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**5%** | Percent of class represented by amount in Row (11)<br>**5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Viking Global Opportunities Drawdown (Aggregator) LP** | Name of reporting person<br>**Viking Global Opportunities Drawdown (Aggregator) LP** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**19354860.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**19354860.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**19354860.00** | Aggregate amount beneficially owned by each reporting person<br>**19354860.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**5%** | Percent of class represented by amount in Row (11)<br>**5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**HALVORSEN OLE ANDREAS** | Name of reporting person<br>**HALVORSEN OLE ANDREAS** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**Q8** | Citizenship or place of organization<br>**Q8** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**58651170.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**58651170.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**58651170.00** | Aggregate amount beneficially owned by each reporting person<br>**58651170.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**15%** | Percent of class represented by amount in Row (11)<br>**15%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Shabet Rose Sharon** | Name of reporting person<br>**Shabet Rose Sharon** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**AF** | Source of funds (See Instructions)<br>**AF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**58651170.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**58651170.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**58651170.00** | Aggregate amount beneficially owned by each reporting person<br>**58651170.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**15%** | Percent of class represented by amount in Row (11)<br>**15%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.001 per share

**(b) Name of Issuer:**
STANDARD BIOTOOLS INC.

**(c) Address of Issuer's Principal Executive Offices:**
50 Milk Street, 10th Floor, Boston, MA, 02109

This Schedule 13D (this "Schedule 13D") is being filed by the Reporting Persons (as defined in Item 2 below) in connection with the execution of a voting agreement with respect to shares of common stock, $0.001 par value per share (the "Common Stock"), of Standard BioTools Inc., a Delaware corporation (the "Issuer").

The information set forth in response to each separate Item below shall be deemed to be a response to all Items where such information is relevant.

**Item 4. Purpose of Transaction**

The response to Item 3 of this Schedule 13D is incorporated by reference herein.

On June 6, 2026, the Issuer, Treeline Biosciences, Inc., a Delaware corporation ("Treeline"), and Siri Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of the Issuer ("Merger Sub"), entered into an Agreement and Plan of Merger and Reorganization (the "Merger Agreement"), pursuant to which, among other matters, and subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Merger Sub will merge with and into Treeline, with Treeline continuing as a wholly owned subsidiary of the Issuer and the surviving corporation of the merger (the "Merger"). Upon the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the Merger ("Effective Time"), each share of capital stock of Treeline will be converted into the right to receive a number of shares of Common Stock in accordance with the Exchange Ratio (as defined in the Merger Agreement).

Also on June 6, 2026, in connection with the Merger Agreement, the Issuer, Treeline and Merger Sub entered into a voting agreement (the "Voting Agreement") with VGOP and VGOD. Pursuant to the Voting Agreement, VGOP and VGOD have agreed, among other things, subject to the terms and conditions thereof, to: (i) vote their beneficially owned securities of the Issuer: (1) in favor of the approval of (i) the issuance of Common Stock to holders of Treeline stock pursuant to the Merger Agreement, (ii) an amendment to the Issuer's charter pursuant to which the name of Issuer will be changed to "Treeline Biosciences Holdings, Inc.", (iii) a reverse stock split of all outstanding shares of Common Stock at a reverse stock split ratio mutually agreed to by Treeline and the Issuer, and (iv) the adoption of the Post-Closing Equity Incentive Plan and Post-Closing ESPP (each as defined in the Merger Agreement); (2) in favor of any proposal to adjourn to a later date if there is not a quorum or sufficient affirmative votes (in person or by proxy) for approval of any such matters on the date on which the meeting is held; (3) against any action or agreement that would reasonably be expected to result in the conditions set forth in the Merger Agreement not being fulfilled or a breach of a covenant, representation or warranty or any other material obligation or agreement of the Issuer contained in the Merger Agreement; (4) against any action, proposal, transaction or agreement that would reasonably be expected to prevent or materially delay the consummation of the transactions contemplated by the Merger Agreement or the fulfillment of the Issuer's or Merger Sub's conditions to closing under the Merger Agreement; and (5) against any third party acquisition transactions; and (ii) comply with certain restrictions on the disposition of such shares, in each case subject to the terms and conditions contained therein. The maximum number of shares of Common Stock beneficially owned by VGOP and VGOD subject to the Voting Agreement shall not at any time exceed 58,651,170 shares of Common Stock or other voting securities of the Issuer (the "Covered Shares Cap").

The foregoing description of the Voting Agreement does not purport to be complete and is qualified in its entirety by reference to the form of the Voting Agreement, which is filed as an exhibit to this Schedule 13D, and is incorporated by reference herein.

The Reporting Persons acquired shares of Common Stock for investment purposes, and such purchases were made in the Reporting Persons' ordinary course of business. This Schedule 13D amends the statement on Schedule 13G filed by the Reporting Persons to report their beneficial ownership of the shares of Common Stock, as most recently amended on May 15, 2026. The Reporting Persons are filing this Schedule 13D, pursuant to Rule 13d-1(e) under the Act, solely as a result of their entering into the Voting Agreement. As such, the Reporting Persons currently are subject to a "cooling-off" period pursuant to Rule 13d-1(e)(2) under the Act, which ends at the expiration of the tenth day from the date of the filing of this Schedule 13D.

The Reporting Persons expect to review from time to time their investment in the Issuer and may, depending on the Issuer's business, assets, operations, financial condition and/or prospects, legal, regulatory and/or contractual restrictions (such as the expiration of the cooling-off period and the transfer restrictions in the Voting Agreement) and other factors: (i) purchase additional shares of Common Stock, options or other securities of the Issuer in the open market, in privately negotiated transactions or otherwise; (ii) sell all or a portion of the shares of Common Stock, options or other securities now beneficially owned or hereafter acquired by them; (iii) enter into hedging transactions with respect to the shares of Common Stock, options or other securities of the Issuer now beneficially owned or hereafter acquired by them; (iv) engage in communications with, without limitation, one or more holders of the Issuer's securities or derivatives, officers of the Issuer, members of the Issuer's board of directors, advisors, potential strategic partners, investment professionals, and/or other persons regarding the Merger or the Issuer more generally, including but not limited to its operations, governance, and control; and (v) engage in such other proposals as the Reporting Persons may deem appropriate under the circumstances, including plans or proposals which may relate to, or could result in, any of the matters referred to in clauses (a) through (j) of Item 4 of Schedule 13D.

**Item 5. Interest in Securities of the Issuer**

**(a)**
As of the date hereof, each of VGI, Opportunities Parent, Mr. Halvorsen and Ms. Shabet may be deemed the beneficial owner of 58,651,170 shares of Common Stock, which represents approximately 15.0% of the outstanding shares of Common Stock. This amount consists of 39,296,310 shares of Common Stock directly owned by VGOP and 19,354,860 shares of Common Stock directly owned by VGOD.

As of the date hereof, each of Opportunities GP, Opportunities Portfolio GP and VGOP may be deemed the beneficial owner of 39,296,310 shares of Common Stock, which represents approximately 10.1% of the outstanding shares of Common Stock. This amount entirely consists of 39,296,310 shares of Common Stock directly owned by VGOP.

As of the date hereof, each of VGOD GP, VGOD Portfolio GP and VGOD may be deemed the beneficial owner of 19,354,860 shares of Common Stock, which represents approximately 5.0% of the outstanding shares of Common Stock. This amount entirely consists of 19,354,860 shares of Common Stock directly owned by VGOD.

The foregoing beneficial ownership percentages are based on 390,368,119 shares of Common Stock outstanding as of May 4, 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.

**(b)**
VGI, Opportunities Parent, Mr. Halvorsen and Ms. Shabet have shared voting power and shared dispositive power with regard to the 39,296,310 shares of Common Stock directly owned by VGOP and the 19,354,860 shares of Common Stock directly owned by VGOD. Opportunities GP, Opportunities Portfolio GP and VGOP have shared voting power and shared dispositive power with regard to the 39,296,310 shares of Common Stock directly owned by VGOP. VGOD GP, VGOD Portfolio GP and VGOD have shared voting power and shared dispositive power with regard to the 19,354,860 shares of Common Stock directly owned by VGOD.

**(c)**
No transactions in the Issuer's securities have been effected by the Reporting Persons during the past 60 days.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

The responses to Items 2, 3 and 4 of this Schedule 13D are incorporated by reference herein.

Registration Rights Agreement

The shares of Common Stock that VGOP and VGOD acquired upon conversion of the Series B-2 Convertible Preferred Stock of the Issuer held by VGOP and VGOD, respectively, are subject to a registration rights agreement with the Issuer, dated January 23, 2022, (the "Registration Rights Agreement") pursuant to which VGOP and VGOD have certain customary registration rights.

The foregoing description of the Registration Rights Agreement does not purport to be complete and is qualified in its entirety by reference to the full text thereof, which is filed as an exhibit to this Schedule 13D, and is incorporated by reference herein.

Except as otherwise set forth in this Schedule 13D, there are no contracts, arrangements, understandings or relationships between the Reporting Persons named in Item 2 and any other person with respect to any securities of the Issuer.

### 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.

**Reporting Person:** VIKING GLOBAL INVESTORS LP

**Signature:** /s/ Scott M. Hendler

**Name/Title:** Scott M. Hendler on behalf of VIKING GLOBAL INVESTORS LP (1)(2)

**Date:** 06/12/2026

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.

**Reporting Person:** 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:** 06/12/2026

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.

**Reporting Person:** 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:** 06/12/2026

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.

**Reporting Person:** 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:** 06/12/2026

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.

**Reporting Person:** 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:** 06/12/2026

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.

**Reporting Person:** 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:** 06/12/2026

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.

**Reporting Person:** 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:** 06/12/2026

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.

**Reporting Person:** 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:** 06/12/2026

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.

**Reporting Person:** HALVORSEN OLE ANDREAS

**Signature:** /s/ Scott M. Hendler

**Name/Title:** Scott M. Hendler on behalf of O. Andreas Halvorsen (1)

**Date:** 06/12/2026

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.

**Reporting Person:** Shabet Rose Sharon

**Signature:** /s/ Scott M. Hendler

**Name/Title:** Scott M. Hendler on behalf of Rose S. Shabet (2)

**Date:** 06/12/2026