CASTLE BIOSCIENCES INC — Director's Dealing 2021

Mar 22, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CASTLE BIOSCIENCES INC (CSTL)
CIK: 0001447362
Period of Report: 2021-03-18

Reporting Person: Cook Joseph C. III (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-03-18	Common Stock	M	12229	$16	Acquired	124407	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-03-18	Stock option (right to buy)	$16.0	M	12229	Disposed	2029-07-23	Common Stock (12229.0)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	628410	Indirect
Common Stock	717	Indirect

Footnotes

F1: Held by MGC Venture Partners 2013, L.P. ("MGC 2013 LP"), MGC Venture Partners 2018, L.P. ("MGC 2018 LP"), MGC Venture Partners QP 2018, L.P. ("MGC 2018 QP LP") and MGC Venture Partners 2013 GP, LLC ("MGC 2013 GP"). MGC 2013 GP is the general partner of MGC 2013 LP. MGC Venture Partners 2018 GP, LLC ("MGC 2018 GP") is the general partner of MGC 2018 LP and MGC 2018 QP LP.

F2: The Reporting Person is a managing director of MGC 2013 GP and a managing partner of MGC 2018 GP, and shares voting and investment power over the shares held by MGC 2013 LP, MGC 2018 LP, MGC 2018 QP LP and MGC 2013 GP. The Reporting Person disclaims beneficial ownership of the shares held by MGC 2013 GP, MGC 2018 GP, MGC 2013 LP, MGC 2018 LP and MGC 2018 QP LP as reported herein, except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purposes.

F3: Held by MOD Partners, LLC ("MOD LLC"). The Reporting Person is the President and a member of MOD LLC and has voting and investment power over the shares held by MOD LLC. The Reporting Person disclaims beneficial ownership of the shares held by MOD LLC as reported herein, except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for purposes of Section 16 or for any other purposes.

F4: 25% of the 30,895 shares originally subject to the option vested on August 1, 2020, and the remaining shares vest in 36 equal monthly installments thereafter.