Butterfly Network CTO sells shares to cover taxes

Butterfly Network, Inc. Chief Technology Officer Victor Ku sold 35,649 shares of Class A Common Stock at a weighted average price of $7.873 per share.

Rhea-AI Filing Summary

Butterfly Network, Inc. Chief Technology Officer Victor Ku sold 35,649 shares of Class A Common Stock at a weighted average price of $7.873 per share. According to company policy, these automatic “sell-to-cover” transactions were made solely to satisfy tax withholding on vested restricted stock units. After the sale, he directly holds 1,063,639 shares.

Insider Trade Summary

Net Seller: 35,649 shares

Net Sell 1 txn

Insider Ku Victor

Role Chief Technology Officer

Sold 35,649 shs ($281K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	35,649	$7.873	$281K

Holdings After Transaction: Class A Common Stock — 1,063,639 shares (Direct)

Footnotes (2)

1. F1. The Issuer has adopted a "sell-to-cover" policy to satisfy the tax withholding obligations of the Reporting Person. The sales reported on this Form 4 represent the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. Such sales were automatic and not at the discretion of the Reporting Person.
2. F2. Represents the weighted average sales price per share. The shares sold at prices ranging from $7.735 to $8.11 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer.

Key Figures

Shares sold: 35,649 shares Weighted average sale price: $7.873 per share Sale price range: $7.735–$8.11 per share +1 more

4 metrics

Shares sold 35,649 shares Open-market sale to cover RSU tax withholding

Weighted average sale price $7.873 per share Class A Common Stock sale on 2026-07-07

Sale price range $7.735–$8.11 per share Range of prices for shares sold

Shares held after transaction 1,063,639 shares Direct Class A Common Stock ownership after sale

Key Terms

sell-to-cover, restricted stock units, weighted average sales price

3 terms

sell-to-cover financial

"The Issuer has adopted a "sell-to-cover" policy to satisfy the tax withholding obligations"

Sell-to-cover is when part of newly issued or exercised company stock is immediately sold to pay required taxes and fees, so the recipient keeps the remaining shares. For investors this matters because it reduces the number of shares insiders or employees actually hold after a grant, can create small, routine share sales that aren’t signal of cashing out, and slightly increases share supply on the market—like selling a portion of a paycheck to cover the tax bill.

restricted stock units financial

"tax withholding obligations in connection with the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

weighted average sales price financial

"Represents the weighted average sales price per share."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Butterfly Network (BFLY) report for Victor Ku?

Butterfly Network reported that Chief Technology Officer Victor Ku sold 35,649 shares of Class A Common Stock. The shares were sold automatically under a company sell-to-cover policy to satisfy tax withholding on vested restricted stock units, not as a discretionary open-market sale.

At what price did Victor Ku’s Butterfly Network (BFLY) shares sell?

Victor Ku’s shares sold at a weighted average price of $7.873 per share. The Form 4 notes individual trades occurred between $7.735 and $8.11 per share, and detailed trade breakdowns are available upon request to regulators, the company, or its shareholders.

Why did Butterfly Network (BFLY) CTO Victor Ku sell shares?

The shares were sold to cover tax withholding obligations from the vesting of restricted stock units. Butterfly Network has a sell-to-cover policy, so these sales occurred automatically and were not made at Victor Ku’s personal discretion as a typical open-market decision.

How many Butterfly Network (BFLY) shares does Victor Ku hold after the sale?

Following the reported transaction, Victor Ku directly holds 1,063,639 shares of Butterfly Network Class A Common Stock. This post-transaction balance is disclosed in the Form 4 and shows his remaining equity position after the tax-related sale of 35,649 shares.

Is Victor Ku’s Butterfly Network (BFLY) share sale a routine tax event?

Yes. The Form 4 explains the issuer adopted a sell-to-cover policy for tax withholding on RSU vesting. The 35,649 shares sold represent only the amount needed for taxes, and the sales were automatic rather than discretionary trading by Victor Ku.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 07/08/2026 - 04:32 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Ku Victor

(Last) (First) (Middle)

C/O BUTTERFLY NETWORK, INC.

1600 DISTRICT AVENUE

(Street)

BURLINGTON MASSACHUSETTS 01803

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Butterfly Network, Inc. [ BFLY ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Technology Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/07/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	07/07/2026		S(1)		35,649	D	$7.873(2)	1,063,639	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The Issuer has adopted a "sell-to-cover" policy to satisfy the tax withholding obligations of the Reporting Person. The sales reported on this Form 4 represent the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. Such sales were automatic and not at the discretion of the Reporting Person.

2. Represents the weighted average sales price per share. The shares sold at prices ranging from $7.735 to $8.11 per share. Full information regarding the number of shares sold at each price shall be provided upon request to the staff of the U.S. Securities and Exchange Commission, the Issuer, or a security holder of the Issuer.

	/s/ Nick Caezza, Attorney-in-Fact	07/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)