Butterfly Network (BFLY) insider Rothberg discloses holdings and stock sales

Rhea-AI Filing Summary

Butterfly Network, Inc. major shareholder Jonathan M. Rothberg filed Amendment No. 8 to update his beneficial ownership of the company’s Class A and Class B common stock.

He now beneficially owns 4,750,704 shares of Class A common stock, or 2.1% of that class, including personal holdings, stock options exercisable within 60 days of December 16, 2025, shares held by entities owned by trusts for his children, and shares held by his spouse. He also beneficially owns 26,426,937 shares of Class B common stock, representing 100% of that class, primarily through 4C Holdings I–V, LLC and related entities, based on shares outstanding as of October 21, 2025.

The amendment also reports multiple sales of Class A shares made in connection with estate planning and pursuant to a Rule 10b5-1 trading plan entered into on March 5, 2025, including 769,327 shares sold on December 8, 2025 at a weighted average price of $3.2727 per share and 601,308 shares sold on December 15, 2025 at a weighted average price of $3.1642 per share.

Insights

Equity ownership and governance analyst

Amended disclosure shows planned insider sales while maintaining large Butterfly Network stake.

The disclosure details Jonathan M. Rothberg’s updated beneficial ownership in Butterfly Network’s dual-class stock structure. He reports 4,750,704 Class A shares, or 2.1% of that class, and 26,426,937 Class B shares, or 100% of that class, based on shares outstanding as of October 21, 2025. These positions include personal holdings, options exercisable within 60 days of December 16, 2025, family trusts, and his spouse’s holdings.

The amendment also lists a series of Class A sales between December 4 and December 16, 2025, described as connected to estate planning and executed under a Rule 10b5-1 trading plan entered into on March 5, 2025. Examples include 769,327 shares sold on December 8, 2025 at a weighted average price of $3.2727 per share and 601,308 shares sold on December 15, 2025 at a weighted average price of $3.1642 per share. Despite these transactions, he continues to hold multi-million-share positions in both classes, so the amendment primarily refines transparency around his ownership and recent trading activity.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 8)

Butterfly Network, Inc.

(Name of Issuer)

Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share

(Title of Class of Securities)

124155102

(CUSIP Number)

Jonathan M. Rothberg, Ph.D.
c/o Butterfly Network, Inc.,, 1600 District Avenue
Burlington, MA, 01803
(781) 557-4800

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

12/16/2025

(Date of Event Which Requires Filing of This Statement)

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

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP No. 124155102

1

Name of reporting person

Rothberg Jonathan M.

2

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

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

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

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 4,024,008.00
8	Shared Voting Power 726,696.00
9	Sole Dispositive Power 4,024,008.00
10	Shared Dispositive Power 726,696.00

11

Aggregate amount beneficially owned by each reporting person

4,750,704.00

12

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

13

Percent of class represented by amount in Row (11)

2.1 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

This Reporting Person's table is for Class A common stock. Rows 7, 9 and 11 consists of (i) 2,799,818 shares of Class A common stock of Butterfly Network, Inc. (f/k/a Longview Acquisition Corp.) (the "Issuer") held by Jonathan M. Rothberg, Ph.D., (ii) stock options to purchase 21,645 shares of Class A common stock of the Issuer which are exercisable within 60 days of December 16, 2025, held by Dr. Jonathan M. Rothberg, (iii) 1,202,545 shares of Class A common stock of the Issuer held by entities owned by trusts created for the benefit of Dr. Jonathan Rothberg's children. Rows 8, 10 and 11 consists of 726,696 shares of Class A common stock of the Issuer held by Dr. Rothberg's spouse. Row 13 is calculated based on 226,175,175 shares of Class A common stock of the Issuer outstanding as of October 21, 2025.

SCHEDULE 13D

CUSIP No. 124155102

1

Name of reporting person

Rothberg Jonathan M.

2

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

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

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

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 26,426,937.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 26,426,937.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

26,426,937.00

12

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

13

Percent of class represented by amount in Row (11)

100 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

This Reporting Person's table is for Class B common stock. Rows 7, 9 and 11 consists of 26,426,937 shares of Class B common stock of the Issuer held by 4C Holdings I, LLC, 4C Holdings II, LLC, 4C Holdings III, LLC, 4C Holdings IV, LLC and 4C Holdings V, LLC and shares distributed from 4C Holdings I, LLC and held by entities owned by trusts created for the benefit of Dr. Jonathan Rothberg's children. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025.

SCHEDULE 13D

CUSIP No. 124155102

1

Name of reporting person

4C Holdings I, LLC

2

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

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

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

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 4,716,596.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 4,716,596.00

11

Aggregate amount beneficially owned by each reporting person

4,716,596.00

12

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

13

Percent of class represented by amount in Row (11)

17.8 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025.

SCHEDULE 13D

CUSIP No. 124155102

1

Name of reporting person

4C Holdings II, LLC

2

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

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

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

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,621,701.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,621,701.00

11

Aggregate amount beneficially owned by each reporting person

2,621,701.00

12

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

13

Percent of class represented by amount in Row (11)

9.9 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025.

SCHEDULE 13D

CUSIP No. 124155102

1

Name of reporting person

4C Holdings III, LLC

2

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

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

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

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,621,701.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,621,701.00

11

Aggregate amount beneficially owned by each reporting person

2,621,701.00

12

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

13

Percent of class represented by amount in Row (11)

9.9 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025.

SCHEDULE 13D

CUSIP No. 124155102

1

Name of reporting person

4C Holdings IV, LLC

2

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

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

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

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 2,621,701.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 2,621,701.00

11

Aggregate amount beneficially owned by each reporting person

2,621,701.00

12

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

13

Percent of class represented by amount in Row (11)

9.9 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025.

SCHEDULE 13D

CUSIP No. 124155102

1

Name of reporting person

4C Holdings V, LLC

2

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

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

PF

5

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

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 8,845,238.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 8,845,238.00

11

Aggregate amount beneficially owned by each reporting person

8,845,238.00

12

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

13

Percent of class represented by amount in Row (11)

33.5 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share
(b)	Name of Issuer: Butterfly Network, Inc.
(c)	Address of Issuer's Principal Executive Offices: 1600 District Avenue, Burlington, MASSACHUSETTS , 01803.
Item 1 Comment: Explanatory Note This Amendment No. 8 to Schedule 13D ("Amendment No. 8") amends and supplements the Schedule 13D filed on February 22, 2021, as amended by Amendment No. 1 filed on March 26, 2021, Amendment No. 2 filed on March 28, 2022, Amendment No. 3 filed on September 16, 2022, Amendment No. 4 filed on September 13, 2023, Amendment No. 5 filed on August 30, 2024, Amendment No. 6 filed on March 7, 2025 and Amendment No. 7 filed on December 1, 2025 (as amended, the "Schedule 13D") relating to the Class A common stock, par value $0.0001 per share, and Class B common stock, par value $0.0001 per share, of Butterfly Network, Inc. (f/k/a Longview Acquisition Corp.), a Delaware corporation (the "Issuer"). Information reported in the Schedule 13D remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment No. 8. Capitalized terms used but not defined herein have the meanings ascribed to them in the Schedule 13D.
Item 5.	Interest in Securities of the Issuer
(c)	Item 5(c) of Schedule 13D is hereby amended and supplemented by adding the following: The following transactions were effected by the Reporting Persons in respect of the Class A common stock since the most recent filing of the Reporting Persons on Schedule 13D. All transactions below were effected by the Reporting Persons in connection with estate planning and pursuant to a Rule 10b5-1 trading plan entered into on March 5, 2025. On December 4, 2025, 64,198 shares of Class A common stock were sold at a weighted average price per share of $3.076. On December 5, 2025, 37,598 shares of Class A common stock were sold at a weighted average price per share of $3.0744. On December 8, 2025, 769,327 shares of Class A common stock were sold at a weighted average price per share of $3.2727. On December 9, 2025, 176,070 shares of Class A common stock were sold at a weighted average price per share of $3.1054. On December 10, 2025, 288,918 shares of Class A common stock were sold at a weighted average price per share of $3.1332. On December 11, 2025, 123,354 shares of Class A common stock were sold at a weighted average price per share of $3.0816. On December 12, 2025, 193,293 shares of Class A common stock were sold at a weighted average price per share of $3.0804. On December 15, 2025, 601,308 shares of Class A common stock were sold at a weighted average price per share of $3.1642. On December 16, 2025, 284,986 shares of Class A common stock were sold at a weighted average price per share of $3.1364.

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.

Rothberg Jonathan M.

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D.
Date:	12/17/2025

Rothberg Jonathan M.

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D.
Date:	12/17/2025

4C Holdings I, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	12/17/2025

4C Holdings II, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	12/17/2025

4C Holdings III, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	12/17/2025

4C Holdings IV, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	12/17/2025

4C Holdings V, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	12/17/2025

FAQ

What does Butterfly Network (BFLY) insider Jonathan M. Rothberg report in this Schedule 13D/A amendment?

The amendment updates Jonathan M. Rothberg’s beneficial ownership in Butterfly Network’s Class A and Class B common stock and discloses recent sales of Class A shares. It shows his current share counts and percentages for each class, along with details of transactions executed in early December 2025.

How many Butterfly Network (BFLY) Class A shares does Jonathan M. Rothberg beneficially own now?

He beneficially owns 4,750,704 shares of Class A common stock, representing 2.1% of the Class A shares outstanding as of October 21, 2025. This amount includes his personal holdings, stock options exercisable within 60 days of December 16, 2025, shares held by entities owned by trusts for his children, and shares held by his spouse.

What is Jonathan M. Rothberg’s beneficial ownership of Butterfly Network (BFLY) Class B common stock?

He beneficially owns 26,426,937 shares of Class B common stock, which the filing states is 100% of that class, based on Class B shares outstanding as of October 21, 2025. These shares are held through 4C Holdings I–V, LLC and entities owned by trusts created for the benefit of his children.

What recent Butterfly Network (BFLY) stock sales by Jonathan M. Rothberg are disclosed?

The amendment lists several Class A stock sales between December 4 and December 16, 2025, all described as in connection with estate planning and under a Rule 10b5-1 trading plan entered into on March 5, 2025. Examples include 769,327 shares sold on December 8, 2025 at a weighted average price of $3.2727 per share and 601,308 shares sold on December 15, 2025 at a weighted average price of $3.1642 per share.

How are Jonathan M. Rothberg’s Butterfly Network (BFLY) Class A holdings structured?

According to the disclosure, his Class A beneficial ownership includes 2,799,818 shares held directly, stock options to purchase 21,645 Class A shares exercisable within 60 days of December 16, 2025, 1,202,545 Class A shares held by entities owned by trusts for his children, and 726,696 Class A shares held by his spouse.

Which entities hold Butterfly Network (BFLY) Class B shares related to Jonathan M. Rothberg?

The filing attributes Class B holdings to 4C Holdings I, II, III, IV and V, LLC and to entities owned by trusts created for the benefit of his children. For example, 4C Holdings I, LLC reports 4,716,596 Class B shares (17.8% of the class), while 4C Holdings V, LLC reports 8,845,238 Class B shares (33.5% of the class), based on Class B shares outstanding as of October 21, 2025.