Butterfly director buys 115K shares at $8.68

Rhea-AI Filing Summary

Butterfly Network, Inc. director Louise S. Phanstiel, through The Phanstiel Trust u/a/d 2/5/02, purchased 115,200 shares of Class A Common Stock on 2026-08-14 at a weighted average price of $8.6763 per share, with trade prices ranging from $8.49 to $8.865 per share.

After this transaction, indirect holdings via the trust total 300,461 shares, and a separate entry reports 390,952 shares held directly. The filing does not indicate use of a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Buyer: 115,200 shares

Net Buy 2 txns

Insider Phanstiel S. Louise

Role Director

Bought 115,200 shs ($1000K)

Type	Security	Shares	Price	Value
Purchase	Class A Common Stock F1	115,200	$8.6763	$1000K
holding	Class A Common Stock	--	--	--

Holdings After Transaction: Class A Common Stock — 300,461 shares (Indirect, By The Phanstiel Trust u/a/d 2/5/02); Class A Common Stock — 390,952 shares (Direct)

Footnotes (1)

1. F1. Represents the weighted average purchase price per share. The shares were purchased at prices ranging from $8.49 to $8.865 per share. Full information regarding the number of shares purchased 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 purchased: 115,200 shares Weighted average purchase price: $8.6763 per share Purchase price range: $8.49–$8.865 per share +3 more

6 metrics

Shares purchased 115,200 shares Class A Common Stock purchased on 2026-08-14

Weighted average purchase price $8.6763 per share Weighted average price for the 115,200-share purchase

Purchase price range $8.49–$8.865 per share Range of prices for trades on 2026-08-14

Indirect holdings after transaction 300,461 shares Shares held indirectly via The Phanstiel Trust u/a/d 2/5/02

Direct holdings reported 390,952 shares Shares held directly following reported activity

Net buy shares 115,200 shares Net share change across reported non-derivative transactions

Key Terms

weighted average purchase price, indirect, open market or private transaction, Rule 10b5-1

4 terms

weighted average purchase price financial

"Represents the weighted average purchase price per share."

The weighted average purchase price is the average cost per share you paid across multiple buys, calculated so larger purchases count more than smaller ones. Imagine buying apples at different prices: the overall price you effectively paid depends on how many apples you bought at each price. Investors use it to measure true cost basis, calculate gains or losses, decide when to sell, and manage taxes and portfolio performance.

indirect financial

"ownership_type is indirect via The Phanstiel Trust"

open market or private transaction financial

"transaction_code_description: Purchase in open market or private transaction"

Rule 10b5-1 regulatory

"Full information ... may be requested by the staff of the U.S. Securities and Exchange Commission"

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.

FAQ

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

What did Butterfly Network (BFLY) director Louise S. Phanstiel report in this Form 4?

Louise S. Phanstiel reported a purchase of 115,200 BFLY shares of Class A Common Stock on 2026-08-14 through a trust. This increased her indirect holdings to 300,461 shares, with an additional 390,952 shares reported as directly held.

At what price did Louise S. Phanstiel buy Butterfly Network (BFLY) shares?

She bought the shares at a weighted average price of $8.6763 per share. According to the disclosure, the shares were purchased in multiple trades at prices ranging from $8.49 to $8.865 per share, with detailed breakdowns available on request.

How many Butterfly Network (BFLY) shares does Louise S. Phanstiel now hold indirectly?

Following the reported transaction, indirect holdings via The Phanstiel Trust u/a/d 2/5/02 total 300,461 shares of Class A Common Stock. This indirect position reflects the trust’s stake in BFLY associated with the reporting person.

What are Louise S. Phanstiel’s direct holdings of Butterfly Network (BFLY) after this filing?

A separate holding line reports that she directly owns 390,952 shares of Butterfly Network Class A Common Stock. This direct position is in addition to the 300,461 shares held indirectly through The Phanstiel Trust u/a/d 2/5/02.

Was the Butterfly Network (BFLY) insider trade made under a Rule 10b5-1 plan?

The Form 4 indicates the Rule 10b5-1 checkbox is not marked as affirming a plan. The transaction is characterized as a purchase in the open market or private transaction, without disclosure that it was executed under a pre-arranged trading plan.

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

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Accepted by SEC EDGAR 08/17/2026 - 04:51 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^*

Phanstiel S. Louise

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

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	08/14/2026		P		115,200	A	$8.6763(1)	300,461	I	By The Phanstiel Trust u/a/d 2/5/02
Class A Common Stock								390,952	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. Represents the weighted average purchase price per share. The shares were purchased at prices ranging from $8.49 to $8.865 per share. Full information regarding the number of shares purchased 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	08/17/2026
	** 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)