Butterfly Network (BFLY) reports Class B share sales and conversions

Rhea-AI Filing Summary

Butterfly Network, Inc. reporting person Jonathan M. Rothberg filed Amendment No. 11 to update his beneficial ownership of both classes of common stock. He is reported to beneficially own 828,775 Class A shares, or 0.4% of that class, based on 234,842,768 Class A shares outstanding as of April 20, 2026. This includes shares held directly, options exercisable within 60 days, and shares held by his spouse. He also beneficially owns 22,086,850 Class B shares, representing 100% of that class, largely through 4C Holdings entities and trusts for his children.

The amendment details recent Class B transactions made in connection with estate planning under a Rule 10b5-1 trading plan entered into on March 13, 2026. On July 17, 2026, 1,195,857 Class B shares were sold at a weighted average price of $6.5959 per share; on July 20, 1,177,276 shares at $6.6138; and on July 21, 753,320 shares at $6.7359. Upon each sale, the Class B shares automatically converted into Class A shares on a one-to-one basis.

Filing Explained

As of July 21, Rothberg is disclosed as beneficially owning 100% of Butterfly Network's Class B shares through five 4C entities and related structures.

A Schedule 13D reports ownership above 5%; this Amendment No. 11 updates Jonathan M. Rothberg's beneficial-ownership record for Butterfly Network and the related 4C entities as of July 21, 2026.

The filing reports 828,775 Class A shares, or 0.4% of that class, and 22,086,850 Class B shares, or 100% of that class. The disclosed Class B position is therefore still the full reported Class B share base, while the Class A position is a small disclosed stake relative to its separate class base.

The Class B ownership is allocated among five 4C entities: 4C Holdings I, II, III, and IV each report 2,621,701 shares, while 4C Holdings V reports 8,845,238 shares; Rothberg's table reports sole voting and dispositive power over the aggregate Class B position.

The percentages are not directly comparable across classes because the filing bases Class A on 234,842,768 shares outstanding as of April 20, 2026, but Class B on 22,086,850 shares outstanding as of July 21, 2026.

Key Figures

Beneficial Class A shares: 828,775 shares Class A ownership percentage: 0.4 % Beneficial Class B shares: 22,086,850 shares +5 more

8 metrics

Beneficial Class A shares 828,775 shares Class A common stock beneficially owned by Jonathan M. Rothberg

Class A ownership percentage 0.4 % Percent of Class A common stock represented by 828,775 shares

Beneficial Class B shares 22,086,850 shares Class B common stock beneficially owned by Jonathan M. Rothberg

Class B ownership percentage 100 % Percent of Class B common stock represented by 22,086,850 shares

Class A shares outstanding 234,842,768 shares Class A common stock outstanding as of April 20, 2026

Class B shares outstanding 22,086,850 shares Class B common stock outstanding as of July 21, 2026

July 17, 2026 Class B sale 1,195,857 shares at $6.5959 Class B shares sold at weighted average price per share

July 20–21, 2026 Class B sales 1,177,276 at $6.6138; 753,320 at $6.7359 Class B shares sold at weighted average prices per share

Key Terms

beneficially owned, Rule 10b5-1 trading plan, dispositive power, estate planning, +1 more

5 terms

beneficially owned financial

"Aggregate amount beneficially owned by each reporting person 828,775.00"

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.

Rule 10b5-1 trading plan regulatory

"transactions were effected ... pursuant to a Rule 10b5-1 trading plan entered into on March 13, 2026"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

dispositive power financial

"Sole Dispositive Power 102,079.00; Shared Dispositive Power 726,696.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

estate planning financial

"All transactions below were effected ... in connection with estate planning"

A set of instructions and legal steps that decide who gets your money, property and other assets, and who will manage them if you become unable to do so. For investors it matters because thoughtful planning can reduce taxes and delays, protect heirs, and keep investments from being tied up in court—think of it as a clear map and emergency kit that preserves value and directs where assets go when you can’t.

Class B common stock financial

"Class B common stock, par value $0.0001 per share, of Butterfly Network, Inc."

A class B common stock is one of multiple types of a company’s ordinary shares that carries specific rights—often different voting power or dividend priority—compared with other classes. For investors it matters because those differences affect how much influence you have over company decisions, the income you might receive, and how freely the shares trade; think of it like owning a car with different keys: some keys let you start the engine and open the trunk, others only unlock the door.

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Available on EDGAR 07/21/2026 - 07:59 PM Accepted by SEC EDGAR 07/21/2026 - 07:58 PM Learn about SEC filing dates

FAQ

What Class A ownership does Jonathan M. Rothberg report in Butterfly Network (BFLY)?

He reports beneficial ownership of 828,775 Class A shares, equal to 0.4% of that class. This consists of 80,434 shares held directly, 21,645 options exercisable within 60 days, and 726,696 shares held by his spouse.

How many Butterfly Network (BFLY) Class B shares does Rothberg beneficially own and what is his percentage?

He is reported to beneficially own 22,086,850 Class B shares, representing 100% of the Class B common stock. The percentage is based on 22,086,850 Class B shares outstanding as of July 21, 2026.

What July 2026 Class B stock sales are disclosed for Butterfly Network (BFLY)?

The filing lists three sales of Class B shares: 1,195,857 shares on July 17 at $6.5959, 1,177,276 shares on July 20 at $6.6138, and 753,320 shares on July 21 at $6.7359, all at weighted average prices.

How are Butterfly Network (BFLY) Class B shares treated in the reported transactions?

In each transaction, the Class B shares automatically converted into Class A shares on a one-to-one basis upon sale. This automatic conversion is described as occurring “in accordance with its terms” for every reported Class B sale.

Was a Rule 10b5-1 plan used for the Butterfly Network (BFLY) insider sales?

Yes. The sales were effected pursuant to a Rule 10b5-1 trading plan entered into on March 13, 2026. The disclosure also states the transactions were made in connection with estate planning by the reporting persons.

On what share counts are Butterfly Network (BFLY) ownership percentages calculated?

The 0.4% Class A ownership is based on 234,842,768 Class A shares outstanding as of April 20, 2026. The 100% Class B ownership is based on 22,086,850 Class B shares outstanding as of July 21, 2026.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 11)

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)

07/21/2026

(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).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 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 102,079.00
8	Shared Voting Power 726,696.00
9	Sole Dispositive Power 102,079.00
10	Shared Dispositive Power 726,696.00

11

Aggregate amount beneficially owned by each reporting person

828,775.00

12

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

13

Percent of class represented by amount in Row (11)

0.4 %

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) 80,434 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. and (ii) stock options to purchase 21,645 shares of Class A common stock of the Issuer which are exercisable within 60 days of July 21, 2026, held by Dr. Jonathan M. Rothberg. 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 234,842,768 shares of Class A common stock of the Issuer outstanding as of April 20, 2026.

SCHEDULE 13D

CUSIP Number(s): 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 22,086,850.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 22,086,850.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

22,086,850.00

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 22,086,850 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 22,086,850 shares of Class B common stock of the Issuer outstanding as of July 21, 2026.

SCHEDULE 13D

CUSIP Number(s): 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)

21.4 %

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 22,086,850 shares of Class B common stock of the Issuer outstanding as of July 21, 2026.

SCHEDULE 13D

CUSIP Number(s): 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)

11.9 %

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 22,086,850 shares of Class B common stock of the Issuer outstanding as of July 21, 2026.

SCHEDULE 13D

CUSIP Number(s): 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)

11.9 %

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 22,086,850 shares of Class B common stock of the Issuer outstanding as of July 21, 2026.

SCHEDULE 13D

CUSIP Number(s): 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)

11.9 %

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 22,086,850 shares of Class B common stock of the Issuer outstanding as of July 21, 2026.

SCHEDULE 13D

CUSIP Number(s): 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)

40.0 %

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 22,086,850 shares of Class B common stock of the Issuer outstanding as of July 21, 2026.

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. 11 to Schedule 13D ("Amendment No. 11") 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, Amendment No. 7 filed on December 1, 2025, Amendment No. 8 filed on December 17, 2025, Amendment No. 9 filed on March 17, 2026 and Amendment No. 10 filed on July 17, 2026 (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. 11. 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 of the Schedule 13D is hereby amended and supplemented by adding the following: The following transactions were effected by the Reporting Persons 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 13, 2026. On July 17, 2026, 1,195,857 shares of Class B common stock were sold at a weighted average price per share of $6.5959. In accordance with its terms, the Class B common stock automatically converted into Class A common stock, on a one-to-one basis, upon sale. On July 20, 2026, 1,177,276 shares of Class B common stock were sold at a weighted average price per share of $6.6138. In accordance with its terms, the Class B common stock automatically converted into Class A common stock, on a one-to-one basis, upon sale. On July 21, 2026, 753,320 shares of Class B common stock were sold at a weighted average price per share of $6.7359. In accordance with its terms, the Class B common stock automatically converted into Class A common stock, on a one-to-one basis, upon sale.

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:	07/21/2026

Rothberg Jonathan M.

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D.
Date:	07/21/2026

4C Holdings I, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	07/21/2026

4C Holdings II, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	07/21/2026

4C Holdings III, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	07/21/2026

4C Holdings IV, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	07/21/2026

4C Holdings V, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	07/21/2026