Butterfly Network (NYSE: BFLY) insider may sell millions of Class B shares

Rhea-AI Filing Summary

Butterfly Network, Inc. insider Jonathan M. Rothberg, Ph.D. filed Amendment No. 12 to his Schedule 13D, updating his ownership and trading arrangements in the company’s dual-class common stock. He is reported as beneficially owning 828,775 shares of Class A common stock, representing 0.3% of the Class A shares outstanding as of July 24, 2026, including 80,434 shares held directly, options for 21,645 shares exercisable within 60 days, and 726,696 shares held by his spouse. He is also reported as beneficially owning 21,426,937 shares of Class B common stock, equal to 100% of the Class B shares outstanding, held through 4C Holdings I–V, LLC. The filing discloses a Rule 10b5-1 trading plan for estate-planning purposes, permitting potential sales of up to 363,348 Class A shares and 8,049,929 Class B shares through November 12, 2027, subject to minimum price and volume conditions, with no assurance any sales will occur.

It also reports that on July 22, 2026, 659,913 Class B shares were sold at a weighted average price of $6.4698 per share, and those shares automatically converted into Class A common stock on a one-to-one basis upon sale.

Key Figures

Class A shares beneficially owned: 828,775 shares Class A ownership percentage: 0.3 % Class B shares beneficially owned: 21,426,937 shares +5 more

8 metrics

Class A shares beneficially owned 828,775 shares Beneficial ownership by Jonathan M. Rothberg, including spouse and options, as reported

Class A ownership percentage 0.3 % Percentage of 244,858,246 Class A shares outstanding as of July 24, 2026

Class B shares beneficially owned 21,426,937 shares Class B common stock beneficially owned through 4C Holdings I–V, LLC

Class B ownership percentage 100 % Percentage of 21,426,937 Class B shares outstanding as of July 24, 2026

Potential Class A sales under plan 363,348 shares Maximum Class A shares that may be sold under the Rule 10b5-1 plan

Potential Class B sales under plan 8,049,929 shares Maximum Class B shares that may be sold under the Rule 10b5-1 plan

Recent Class B shares sold 659,913 shares Class B shares sold on July 22, 2026 under a Rule 10b5-1 trading plan

Weighted average sale price $6.4698 per share Weighted average price for the 659,913 Class B shares sold on July 22, 2026

Key Terms

beneficially owned, Rule 10b5-1, cooling-off period, weighted average price, +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 regulatory

"entered into a trading plan pursuant to Rule 10b5-1 , as amended"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

cooling-off period regulatory

"plan sales period beginning following the cooling-off period contained"

A cooling-off period is a temporary pause around a planned securities offering or major corporate action during which the company, underwriters and insiders limit promotional statements and certain transactions so investors can review official documents and regulators can assess disclosures. It matters to investors because it reduces the risk of decisions driven by hype, gives time to read the prospectus and legal filings, and helps ensure a fairer, more orderly market — like a mandatory waiting period before a big sale so buyers can compare facts calmly.

weighted average price financial

"shares of Class B common stock were sold at a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Class B common stock financial

"21,426,937 shares of Class B common stock of the Issuer held by"

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.

FAQ

What ownership stake in Butterfly Network (BFLY) does Jonathan Rothberg report in this Schedule 13D/A?

Jonathan Rothberg reports beneficial ownership of 828,775 Class A shares (about 0.3% of Class A outstanding) and 21,426,937 Class B shares, which equals 100% of the Class B common stock as of July 24, 2026.

How many Butterfly Network (BFLY) shares can be sold under Jonathan Rothberg’s Rule 10b5-1 plan?

The Rule 10b5-1 plan permits potential sales of up to 363,348 Class A shares and 8,049,929 Class B shares through November 12, 2027, subject to minimum price and volume conditions, and there is no assurance any shares will be sold.

What recent Butterfly Network (BFLY) share sale does the amended Schedule 13D report?

On July 22, 2026, the reporting persons sold 659,913 shares of Class B common stock at a weighted average price of $6.4698 per share. Upon sale, these Class B shares automatically converted into Class A common stock on a one-to-one basis.

How many Butterfly Network (BFLY) Class A shares are outstanding according to this filing?

The filing states that 244,858,246 shares of Class A common stock were outstanding as of July 24, 2026. This figure is used to calculate Jonathan Rothberg’s reported 0.3% beneficial ownership of Butterfly Network’s Class A common stock.

How is Jonathan Rothberg’s Butterfly Network (BFLY) Class B ownership structured?

He is reported as beneficially owning 21,426,937 Class B shares, or 100% of the Class B common stock, held through entities 4C Holdings I–V, LLC, with each LLC holding a specified portion of the total Class B shares.

What is the sales period for the Butterfly Network (BFLY) Rule 10b5-1 trading plan?

The Rule 10b5-1 trading plan sales period begins after the Rule 10b5-1(c) cooling-off period and runs until November 12, 2027, during which sales may occur if the plan’s conditions are met.

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Available on EDGAR 08/17/2026 - 06:31 PM Accepted by SEC EDGAR 08/17/2026 - 06:30 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 12)

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)

08/14/2026

(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)

0.3 %

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 August 17, 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 244,858,246 shares of Class A common stock of the Issuer outstanding as of July 24, 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 21,426,937.00
8	Shared Voting Power 0.00
9	Sole Dispositive Power 21,426,937.00
10	Shared Dispositive Power 0.00

11

Aggregate amount beneficially owned by each reporting person

21,426,937.00

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 21,426,937 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. Row 13 is calculated based on 21,426,937 shares of Class B common stock of the Issuer outstanding as of July 24, 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)

22.0 %

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 21,426,937 shares of Class B common stock of the Issuer outstanding as of July 24, 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)

12.2 %

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 21,426,937 shares of Class B common stock of the Issuer outstanding as of July 24, 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)

12.2 %

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 21,426,937 shares of Class B common stock of the Issuer outstanding as of July 24, 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)

12.2 %

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 21,426,937 shares of Class B common stock of the Issuer outstanding as of July 24, 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)

41.3 %

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 21,426,937 shares of Class B common stock of the Issuer outstanding as of July 24, 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. 12 to Schedule 13D ("Amendment No. 12") 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, Amendment No. 10 filed on July 17, 2026 and Amendment No. 11 filed on July 21, 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. 12. Capitalized terms used but not defined herein have the meanings ascribed to them in the Schedule 13D.
Item 4.	Purpose of Transaction
	Item 4 of the Schedule 13D is hereby amended and supplemented by adding the following: In connection with estate planning, Dr. Rothberg, acting on his own and on behalf of 4C Holdings I, LLC, 4C Holdings II, LLC, 4C Holdings III, LLC, 4C Holdings IV, LLC, and Dr. Bonnie Rothberg, Dr. Rothberg's spouse, entered into a trading plan pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the "Plan"), a copy of which is attached hereto as Exhibit 6. Pursuant to the Plan, sales of up to 363,348 shares of Class A common stock and 8,049,929 shares of Class B common stock may be effected during the plan sales period beginning following the cooling-off period contained in Rule 10b5-1(c) and ending on November 12, 2027 in accordance with the terms and conditions of the Plan. The sale of shares of Class A common stock and Class B common stock under the Plan is subject to minimum price and volume parameters included in the Plan, and there is no assurance that any shares of Class A common stock or Class B common stock will be sold under the Plan.
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 22, 2026, 659,913 shares of Class B common stock were sold at a weighted average price per share of $6.4698. 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.
Item 7.	Material to be Filed as Exhibits.
	Item 7 of the Schedule 13D is hereby amended by adding the following exhibit: Exhibit No. 7 - Rule 10b5-1 Trading Plan

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:	08/17/2026

Rothberg Jonathan M.

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D.
Date:	08/17/2026

4C Holdings I, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	08/17/2026

4C Holdings II, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	08/17/2026

4C Holdings III, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	08/17/2026

4C Holdings IV, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	08/17/2026

4C Holdings V, LLC

Signature:	/s/ Jonathan M. Rothberg
Name/Title:	Jonathan M. Rothberg, Ph.D., Manager
Date:	08/17/2026