Butterfly Network CTO sells shares to cover taxes

Rhea-AI Filing Summary

Butterfly Network, Inc. Chief Technology Officer Victor Ku reported an automatic sale of 48,540 shares of Class A common stock on July 20, 2026 to cover tax withholding from vesting restricted stock units, at a weighted average price of $6.56 (range $6.46–$6.665). After these sell-to-cover transactions, he directly holds 1,015,099 shares.

Insider Trade Summary

Net Seller: 48,540 shares

Net Sell 1 txn

Insider Ku Victor

Role Chief Technology Officer

Sold 48,540 shs ($318K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F1, F2	48,540	$6.56	$318K

Holdings After Transaction: Class A Common Stock — 1,015,099 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 $6.46 to $6.665 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: 48,540 shares Weighted average sale price: $6.56 per share Sale price range: $6.46–$6.665 per share +1 more

4 metrics

Shares sold 48,540 shares Class A Common Stock sold on July 20, 2026

Weighted average sale price $6.56 per share Automatic sale to cover RSU tax withholding

Sale price range $6.46–$6.665 per share Range of execution prices for reported sales

Shares owned after sale 1,015,099 shares Direct holdings following the sell-to-cover transaction

Key Terms

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

4 terms

sell-to-cover financial

"Issuer has adopted a sell-to-cover policy to satisfy tax 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

"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"

tax withholding obligations financial

"shares required to be sold to cover tax withholding obligations"

FAQ

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

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

Victor Ku sold 48,540 Butterfly Network Class A shares on July 20, 2026 at a weighted average price of $6.56 per share. The automatic sell-to-cover sale was for RSU tax withholding, leaving him with 1,015,099 shares directly owned.

Why were Victor Ku’s Butterfly Network (BFLY) shares sold?

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 the transactions were automatic and not at Ku’s discretion, according to the Form 4 footnote disclosure.

How many Butterfly Network (BFLY) shares does Victor Ku own after this sale?

After the reported tax-related sale, Victor Ku directly owns 1,015,099 shares of Butterfly Network Class A common stock. This post-transaction holding reflects his position following the automatic sell-to-cover transactions disclosed in the insider report.

At what prices were Victor Ku’s BFLY shares sold in this insider trade?

The shares were sold at a weighted average price of $6.56 per share, with individual trades executed between $6.46 and $6.665. Detailed breakdowns by price level are available upon request to the SEC staff, the company, or its security holders.

Was Victor Ku’s BFLY share sale part of an automatic policy or trading plan?

The company states it has a sell-to-cover policy, and these sales were automatic to satisfy RSU tax withholding, not at Ku’s discretion. The Rule 10b5-1 trading-plan affirmation box on the Form 4 is not marked as being pursuant to such a plan.

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 07/21/2026 - 04:26 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)
07/20/2026

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	07/20/2026		S(1)		48,540	D	$6.56(2)	1,015,099	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 $6.46 to $6.665 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	07/21/2026
	** 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)