X0202 SCHEDULE 13D/A 0001138995 XXXXXXXX LIVE 8 Class A common stock, par value $0.0001 per share 08/13/2026 false 0001804176 124155102 Butterfly Network, Inc.

1600 District Avenue Burlington MA 01803

Mark Horowitz (212) 812-4700 Glenview Capital Management, LLC 520 Madison Avenue, 33rd Floor New York NY 10022 0001138995 N GLENVIEW CAPITAL MANAGEMENT, LLC AF DE 0 11743530 0 11743530 11743530 N 4.8 OO (1) Shared voting power and shared dispositive power includes 11,743,530 shares of Common Stock held directly by the Glenview Funds. (2) Percent of class is calculated based on 244,858,246 shares of Common Stock outstanding as of July 24, 2026, as reported in the Issuer's Form 10-Q filed on July 30, 2026. 0001228603 N ROBBINS LARRY AF X1 412597 14707717 412597 14707717 15120314 N 6.17 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) 25,447 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 2027 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) 11,743,530 shares of Common Stock held directly by the Glenview Funds and (ii) 2,964,187 shares of Common Stock held directly by Longview Investors LLC. (5) Percent of class is calculated based on 244,858,246 shares of Common Stock outstanding as of July 24, 2026, as reported in the Issuer's Form 10-Q filed on July 30, 2026, 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. 8 ("Amendment No. 8") amends and supplements the information set forth in the Schedule 13D filed by the Reporting Persons (as defined in Amendment No. 4) 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, Amendment No. 5, filed with the SEC on June 17, 2025, Amendment No. 6, filed with the SEC on November 24, 2025, and Amendment No. 7, filed with the SEC on February 17, 2026 (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. 8 does not modify any of the information previously reported in the Schedule 13D. Item 4 of the Schedule 13D is hereby amended and supplemented as follows: On June 22, 2026, Mr. Robbins was granted 25,447 shares of unvested restricted stock units, each representing the right to receive one share of Common Stock upon vesting, which vest in full on the date of the Issuer's 2027 Annual Stockholders Meeting, subject to Mr. Robbins' continued service on the Issuer's board of directors on such date. 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: Item 4 of this Amendment No. 8 is incorporated herein by reference. Except for the transactions listed in Exhibit G of this Amendment No. 8, the Reporting Persons have not effected any transactions with respect to the Common Stock during the past 60 days. As of August 13, 2026, Glenview ceased to be the beneficial owner of more than five percent of the class of securities. Item 7 of the Schedule 13D is hereby amended and supplemented as follows: Exhibit G: Schedule of Transactions for Item 5(c) of Amendment No. 8 GLENVIEW CAPITAL MANAGEMENT, LLC /s/ Mark J. Horowitz 08/17/2026 ROBBINS LARRY /s/ Mark J. Horowitz 08/17/2026