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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13D/A 0001076352 XXXXXXXX LIVE 8 Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share 12/16/2025 false 0001804176 124155102 Butterfly Network, Inc. 1600 District Avenue Burlington MA 01803 Jonathan M. Rothberg, Ph.D. (781) 557-4800 c/o Butterfly Network, Inc., 1600 District Avenue Burlington MA 01803 0001076352 N Rothberg Jonathan M. PF N X1 4024008.00 726696.00 4024008.00 726696.00 4750704.00 N 2.1 IN This Reporting Person's table is for Class A common stock. Rows 7, 9 and 11 consists of (i) 2,799,818 shares of Class A common stock of Butterfly Network, Inc. (f/k/a Longview Acquisition Corp.) (the "Issuer") held by Jonathan M. Rothberg, Ph.D., (ii) stock options to purchase 21,645 shares of Class A common stock of the Issuer which are exercisable within 60 days of December 16, 2025, held by Dr. Jonathan M. Rothberg, (iii) 1,202,545 shares of Class A common stock of the Issuer held by entities owned by trusts created for the benefit of Dr. Jonathan Rothberg's children. Rows 8, 10 and 11 consists of 726,696 shares of Class A common stock of the Issuer held by Dr. Rothberg's spouse. Row 13 is calculated based on 226,175,175 shares of Class A common stock of the Issuer outstanding as of October 21, 2025. Y Rothberg Jonathan M. PF N X1 26426937.00 0.00 26426937.00 0.00 26426937.00 N 100 IN This Reporting Person's table is for Class B common stock. Rows 7, 9 and 11 consists of 26,426,937 shares of Class B common stock of the Issuer held by 4C Holdings I, LLC, 4C Holdings II, LLC, 4C Holdings III, LLC, 4C Holdings IV, LLC and 4C Holdings V, LLC and shares distributed from 4C Holdings I, LLC and held by entities owned by trusts created for the benefit of Dr. Jonathan Rothberg's children. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025. Y 4C Holdings I, LLC PF N DE 0.00 4716596.00 0.00 4716596.00 4716596.00 N 17.8 OO This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025. Y 4C Holdings II, LLC PF N DE 0.00 2621701.00 0.00 2621701.00 2621701.00 N 9.9 OO This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025. Y 4C Holdings III, LLC PF N DE 0.00 2621701.00 0.00 2621701.00 2621701.00 N 9.9 OO This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025. Y 4C Holdings IV, LLC PF N DE 0.00 2621701.00 0.00 2621701.00 2621701.00 N 9.9 OO This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025. Y 4C Holdings V, LLC PF N DE 0.00 8845238.00 0.00 8845238.00 8845238.00 N 33.5 OO This Reporting Person's table is for Class B common stock. Row 13 is calculated based on 26,426,937 shares of Class B common stock of the Issuer outstanding as of October 21, 2025. Class A common stock, par value $0.0001 per share, Class B common stock, par value $0.0001 per share Butterfly Network, Inc. 1600 District Avenue Burlington MA 01803 Explanatory Note This Amendment No. 8 to Schedule 13D ("Amendment No. 8") amends and supplements the Schedule 13D filed on February 22, 2021, as amended by Amendment No. 1 filed on March 26, 2021, Amendment No. 2 filed on March 28, 2022, Amendment No. 3 filed on September 16, 2022, Amendment No. 4 filed on September 13, 2023, Amendment No. 5 filed on August 30, 2024, Amendment No. 6 filed on March 7, 2025 and Amendment No. 7 filed on December 1, 2025 (as amended, the "Schedule 13D") relating to the Class A common stock, par value $0.0001 per share, and Class B common stock, par value $0.0001 per share, of Butterfly Network, Inc. (f/k/a Longview Acquisition Corp.), a Delaware corporation (the "Issuer"). Information reported in the Schedule 13D remains in effect except to the extent that it is amended, restated or superseded by information contained in this Amendment No. 8. Capitalized terms used but not defined herein have the meanings ascribed to them in the Schedule 13D. Item 5(c) of Schedule 13D is hereby amended and supplemented by adding the following: The following transactions were effected by the Reporting Persons in respect of the Class A common stock since the most recent filing of the Reporting Persons on Schedule 13D. All transactions below were effected by the Reporting Persons in connection with estate planning and pursuant to a Rule 10b5-1 trading plan entered into on March 5, 2025. On December 4, 2025, 64,198 shares of Class A common stock were sold at a weighted average price per share of $3.076. On December 5, 2025, 37,598 shares of Class A common stock were sold at a weighted average price per share of $3.0744. On December 8, 2025, 769,327 shares of Class A common stock were sold at a weighted average price per share of $3.2727. On December 9, 2025, 176,070 shares of Class A common stock were sold at a weighted average price per share of $3.1054. On December 10, 2025, 288,918 shares of Class A common stock were sold at a weighted average price per share of $3.1332. On December 11, 2025, 123,354 shares of Class A common stock were sold at a weighted average price per share of $3.0816. On December 12, 2025, 193,293 shares of Class A common stock were sold at a weighted average price per share of $3.0804. On December 15, 2025, 601,308 shares of Class A common stock were sold at a weighted average price per share of $3.1642. On December 16, 2025, 284,986 shares of Class A common stock were sold at a weighted average price per share of $3.1364. Rothberg Jonathan M. /s/ Jonathan M. Rothberg Jonathan M. Rothberg, Ph.D. 12/17/2025 Rothberg Jonathan M. /s/ Jonathan M. Rothberg Jonathan M. Rothberg, Ph.D. 12/17/2025 4C Holdings I, LLC /s/ Jonathan M. Rothberg Jonathan M. Rothberg, Ph.D., Manager 12/17/2025 4C Holdings II, LLC /s/ Jonathan M. Rothberg Jonathan M. Rothberg, Ph.D., Manager 12/17/2025 4C Holdings III, LLC /s/ Jonathan M. Rothberg Jonathan M. Rothberg, Ph.D., Manager 12/17/2025 4C Holdings IV, LLC /s/ Jonathan M. Rothberg Jonathan M. Rothberg, Ph.D., Manager 12/17/2025 4C Holdings V, LLC /s/ Jonathan M. Rothberg Jonathan M. Rothberg, Ph.D., Manager 12/17/2025