SCHEDULE 13D/A 0001138995 XXXXXXXX LIVE 6 Class A common stock, par value $0.0001 per share 11/21/2025 false 0001804176 124155102 Butterfly Network, Inc.

1600 District Avenue Burlington MA 01803

Mark Horowitz (212) 812-4700 Glenview Capital Management, LLC 767 Fifth Avenue, 44th Floor New York NY 10153 0001138995 GLENVIEW CAPITAL MANAGEMENT, LLC AF DE 0 14468477 0 14468477 14468477 N 6.35 OO (1) Shared voting power and shared dispositive power includes (i) 12,755,144 shares of Common Stock held directly by the Glenview Funds and (ii) 1,713,333 shares of Common Stock issuable to the Glenview Funds upon exercise of the Private Placement Warrants. (2) Percent of class is calculated based on 226,175,175 shares of Common Stock outstanding as of October 21, 2025, as reported in the Issuer's Form 10-Q filed on October 31, 2025, plus the shares of Common Stock the Reporting Person has the right to acquire, which shares have been added to the total shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Act. 0001228603 ROBBINS LARRY AF X1 387150 22047764 387150 22047764 22434914 N 9.71 IN HC (3) Sole voting power and sole dispositive power includes (i) 21,645 shares of Common Stock that Mr. Robbins has the right to acquire upon exercise of stock options and (ii) 80,434 shares of Common Stock underlying unvested restricted stock units that were granted to Mr. Robbins, which vest in full on the date of the Issuer's 2026 Annual Stockholders Meeting, subject to Mr. Robbins' continued service on the Issuer's board of directors on such date. (4) Shared voting power and shared dispositive power includes (i) 12,755,144 shares of Common Stock held directly by the Glenview Funds, (ii) 4,546,687 shares of Common Stock held directly by Longview Investors LLC, (iii) 3,032,600 shares of Common Stock issuable to Longview Investors LLC upon exercise of the Private Placement Warrants, and (iv) 1,713,333 shares of Common Stock issuable to the Glenview Funds upon exercise of the Private Placement Warrants. (5) Percent of class is calculated based on 226,175,175 shares of Common Stock outstanding as of October 21, 2025, as reported in the Issuer's Form 10-Q filed on October 31, 2025, plus the shares of Common Stock the Reporting Person has the right to acquire, which shares have been added to the total shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Act. Class A common stock, par value $0.0001 per share Butterfly Network, Inc. 1600 District Avenue Burlington MA 01803 Explanatory Note: This Amendment No. 6 ("Amendment No. 6") amends and supplements the information set forth in the Schedule 13D filed by the Reporting Persons and Longview Investors LLC ("Longview") with the U.S. Securities and Exchange Commission (the "SEC") on February 17, 2021, as amended by Amendment No. 1, filed with the SEC on March 30, 2021, Amendment No. 2, filed with the SEC on March 11, 2022, Amendment No. 3, filed with the SEC on February 14, 2023, Amendment No. 4, filed with the SEC on September 3, 2024, and Amendment No. 5, filed with the SEC on June 17, 2025 (collectively, the "Schedule 13D"), relating to the Class A common stock, par value $0.0001 per share (the "Common Stock"), of Butterfly Network, Inc. (the "Issuer"). The Issuer's principal executive offices are located at 1600 District Avenue, Burlington, MA 01803. All capitalized terms contained herein but not otherwise defined shall have the meanings ascribed to such terms in the Schedule 13D. Except as specifically provided herein, this Amendment No. 6 does not modify any of the information previously reported in the Schedule 13D. Item 3 of the Schedule 13D is hereby amended and supplemented as follows: Item 5(c) of this Amendment No. 6 is incorporated by reference herein. The funds used for the purchase of the shares of Common Stock reported in Item 5(c) of this Amendment No. 6 was derived from the general working capital of the Glenview Funds. A total of approximately $6,793,859.99, including commissions, was paid to acquire the shares of Common Stock purchased and reported in Item 5(c) of this Amendment No. 6. Item 5(a) of the Schedule 13D is hereby amended and supplemented as follows: Items 7-11 of the cover pages of the Schedule 13D are incorporated herein by reference. Item 5(b) of the Schedule 13D is hereby amended and supplemented as follows: Items 7-11 of the cover pages of the Schedule 13D are incorporated herein by reference. Item 5(c) of the Schedule 13D is hereby amended and supplemented as follows: Except for the transactions listed in Exhibit F of this Amendment No. 6, the Reporting Persons have not effected any transactions with respect to the Common Stock during the past 60 days. Item 7 of the Schedule 13D is hereby amended and supplemented as follows: Exhibit F: Schedule of Transactions for Item 5(c) of Amendment No. 6 GLENVIEW CAPITAL MANAGEMENT, LLC /s/ Mark J. Horowitz 11/24/2025 ROBBINS LARRY /s/ Mark J. Horowitz 11/24/2025