Butterfly Network (BFLY) CTO Victor Ku reports automatic sell-to-cover stock sale

Rhea-AI Filing Summary

Butterfly Network Chief Technology Officer Victor Ku reported an automatic sale of company stock related to tax withholding. On January 5, 2026, he sold 35,968 shares of Butterfly Network Class A common stock at a weighted average price of $3.82 per share in a transaction coded as a sale.

According to the disclosure, Butterfly Network has a "sell-to-cover" policy for equity awards, and these shares were sold automatically to cover tax withholding triggered by the vesting of restricted stock units, rather than at Ku’s discretion. After this transaction, Ku beneficially owned 811,962 shares of Class A common stock directly.

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

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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 MA 01803

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
01/05/2026

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

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

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

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	01/05/2026		S(1)		35,968	D	$3.82(2)	811,962	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 $3.765 to $3.91 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	01/07/2026
	** 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.
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FAQ

What insider transaction did Butterfly Network CTO Victor Ku report on this Form 4 for BFLY?

Victor Ku, Chief Technology Officer of Butterfly Network, Inc. (BFLY), reported a sale of 35,968 shares of Class A common stock on January 5, 2026. The transaction is coded as a sale of non-derivative securities.

At what price were Victor Kue28099s Butterfly Network (BFLY) shares sold in this Form 4?

The shares were sold at a weighted average price of $3.82 per share. A footnote explains that the individual sale prices ranged from $3.765 to $3.91 per share.

Why did Butterfly Network CTO Victor Ku sell shares according to this BFLY Form 4?

The filing states that Butterfly Network has a "sell-to-cover" policy to satisfy tax withholding obligations. The reported sales represent the number of shares required to be sold to cover tax withholding arising from the vesting of restricted stock units, and the sales were automatic rather than at Kue28099s discretion.

How many Butterfly Network (BFLY) shares does Victor Ku own after the reported transaction?

Following the January 5, 2026 sale, Victor Ku beneficially owned 811,962 shares of Butterfly Network Class A common stock, held directly.

What role does Victor Ku hold at Butterfly Network (BFLY) in this Form 4 filing?

In this filing, Victor Ku is identified as an officer of Butterfly Network, serving as the companye28099s Chief Technology Officer.

Was the Butterfly Network (BFLY) insider sale by Victor Ku discretionary?

No. The filing explains that the issuere28099s sell-to-cover policy resulted in automatic sales of shares to satisfy tax withholding from restricted stock unit vesting, and that the sales were not at the discretion of the reporting person.