CASTLE BIOSCIENCES INC — Director's Dealing 2020

Dec 9, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: CASTLE BIOSCIENCES INC (CSTL)
CIK: 0001447362
Period of Report: 2020-12-07

Reporting Person: Cook Joseph C. III (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-12-07	Common Stock	S	2600	$55.84	Disposed	159578	Direct
2020-12-08	Common Stock	S	7400	$55.975	Disposed	152178	Direct
2020-12-08	Common Stock	S	27176	$56.284	Disposed	871234	Indirect
2020-12-08	Common Stock	S	5388	$56.233	Disposed	865846	Indirect
2020-12-08	Common Stock	S	4612	$56.204	Disposed	861234	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	717	Indirect

Footnotes

F1: These transactions were made pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on September 10, 2020.

F2: This transaction was executed in multiple trades at prices ranging from $55.750 to $56.040, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F3: This transaction was executed in multiple trades at prices ranging from $55.750 to $56.330, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F4: This transaction was made pursuant to a Rule 10b5-1 plan adopted by MGC Venture Partners 2013, L.P. ("MGC 2013 LP") on August 13, 2020, as amended on September 10, 2020.

F5: This transaction was executed in multiple trades at prices ranging from $56.150 to $56.900, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F6: Held by 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.

F7: 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.

F8: This transaction was made pursuant to a Rule 10b5-1 plan adopted by MGC 2018 QP LP on August 13, 2020, as amended on September 10, 2020.

F9: This transaction was executed in multiple trades at prices ranging from $56.150 to $56.455, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F10: This transaction was made pursuant to a Rule 10b5-1 plan adopted by MGC 2018 LP on August 13, 2020, as amended on September 10, 2020.

F11: This transaction was executed in multiple trades at prices ranging from $56.150 to $56.590, inclusive. The price reported above reflects the weighted-average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F12: 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.