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Filing Details

Accession Number:: 0000899243-20-013561
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2020-05-19 16:05:33
Reporting Period:: 2020-05-15

Accepted Time:: 2020-05-19 16:05:33
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1447362	Castle Biosciences Inc	CSTL	Services-Medical Laboratories (8071)	770701744

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1572764	Mgc Venture Partners 2013, L.p.	C/O Mountain Group Capital, Llc 3835 Cleghorn Ave., Suite 300 Nashville TN 37215	No	No	Yes	No
1745133	Mgc Venture Partners 2018, L.p.	C/O Mountain Group Capital, Llc 3835 Cleghorn Ave., Suite 300 Nashville TN 37215	No	No	Yes	No
1749814	Mgc Venture Partners Qp 2018, L.p.	C/O Mountain Group Capital, Llc 3835 Cleghorn Ave., Ste. 300 Nashville TN 37215	No	No	Yes	No
1783291	Mgc Venture Partners 2018 Gp, Llc	C/O Mountain Group Capital, Llc 3835 Cleghorn Ave., Suite 300 Nashville TN 37215	No	No	Yes	No
1783292	Mgc Venture Partners 2013 Gp, Llc	C/O Mountain Group Capital, Llc 3835 Cleghorn Ave., Suite 300 Nashville TN 37215	No	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2020-05-15	13,799	$36.39	1,472,137	No	4	S	Indirect	See footnotes
Common Stock	Disposition	2020-05-15	8,117	$37.28	1,464,020	No	4	S	Indirect	See footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnotes
No	4	S	Indirect	See footnotes

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	115,300	Indirect	See footnotes
Common Stock	134,700	Indirect	See footnotes

Footnotes

The transactions on this Form 4 were made pursuant to a Rule 10b5-1 plan adopted by MGC Venture Partners 2013, L.P. ("MGC 2013 LP") on March 13, 2020.
This transaction was executed in multiple trades at prices ranging from $36.00 to $36.98, inclusive. The price reported above reflects the weighted-average sale price. MGC 2013 LP 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.
Held directly by MGC 2013 LP.
MGC Venture Partners 2013 GP, LLC ("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 Venture Partners 2018, L.P. ("MGC 2018 LP") and MGC Venture Partners QP 2018, L.P. ("MGC QP 2018 LP"). Each of MGC 2013 LP, MGC 2013 GP, MGC 2018 LP, MGC QP 2018 LP and MGC 2018 GP directly (whether through ownership or position) or indirectly through one or more intermediaries, may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, to be the indirect beneficial owner of some or all of the shares owned by MGC 2013 LP, MGC 2018 LP and MGC QP 2018 LP and, therefore, a "ten percent holder" hereunder.
Each of Joseph C. Cook, Jr., Joseph C. Cook III, Steven D. Singleton and Byron W. Smith are managing directors of MGC 2013 GP and share voting and investment power over the shares held by MGC 2013 LP. Each of Joseph C. Cook, Jr., Joseph C. Cook III, Steven D. Singleton, Byron W. Smith, Jay Ferguson and Rob Readnour are managing partners of MGC 2018 GP and share voting and investment power over the shares held by MGC 2018 LP and MGC QP 2018 LP. Each of the reporting persons disclaims beneficial ownership of the shares held by any other reporting persons reported herein, except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that the reporting persons are the beneficial owners of such securities for purposes of Section 16 or for any other purposes.
This transaction was executed in multiple trades at prices ranging from $37.00 to $37.50, inclusive. The price reported above reflects the weighted-average sale price. MGC 2013 LP 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.
Reflects number of shares owned as of May 15, 2020.
Held directly by MGC 2018 LP.
Held directly by MGC QP 2018 LP.