Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1,F2	Oct 22, 2018	C	52,690	—	A	52,690	I	By Hatteras Venture Partners I, LP
Common Stock^F1,F3	Oct 22, 2018	C	1,683,420	—	A	1,683,420	I	By Hatteras Venture Partners III, LP
Common Stock^F3	Oct 22, 2018	P	137,513	$5.00	A	1,820,933	I	By Hatteras Venture Partners III, LP
Common Stock^F1,F3	Oct 22, 2018	C	150,612	—	A	150,612	I	By Hatteras Venture Affiliates III, LP
Common Stock^F3	Oct 22, 2018	P	12,487	$5.00	A	163,099	I	By Hatteras Venture Affiliates III, LP
Common Stock^F1,F2	Oct 22, 2018	C	4,846	—	A	4,846	I	By Catalysta Ventures, LLC
Common Stock^F1,F3	Oct 22, 2018	C	266,481	—	A	266,481	I	By Venture Capital Multiplier Fund
Common Stock^F3	Oct 22, 2018	P	150,000	$5.00	A	416,481	I	By Venture Capital Multiplier Fund

Table II — derivative securities

Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Warrants to Purchase Series B Preferred Stock^F3,F5,F1	$0.12	Oct 22, 2018	X	19,061	D	—	—	Series B Preferred Stock	19,061	0	I
Series B Preferred Stock^F3,F1	—	Oct 22, 2018	X	19,061	A	—	—	Common Stock	19,061	1,045,222	I
Series B Preferred Stock^F3,F1	—	Oct 22, 2018	S	458	D	—	—	Common Stock	458	1,044,764	I
Warrants to Purchase Series B Preferred Stock^F3,F5,F1	$0.12	Oct 22, 2018	X	1,731	D	—	—	Series B Preferred Stock	1,731	0	I
Series B Preferred Stock^F3,F1	—	Oct 22, 2018	X	1,731	A	—	—	Common Stock	1,731	94,916	I
Series B Preferred Stock^F3,F1	—	Oct 22, 2018	S	42	D	—	—	Common Stock	42	94,874	I
Warrants to Purchase Series C-1 Preferred Stock^F3,F5,F1	$0.12	Oct 22, 2018	X	47,458	D	—	—	Series C-1 Preferred Stock	47,458	0	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	X	47,458	A	—	—	Common Stock	47,458	150,459	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	S	1,139	D	—	—	Common Stock	1,139	149,320	I
Warrants to Purchase Series C-1 Preferred Stock^F3,F5,F1	$0.12	Oct 22, 2018	X	4,309	D	—	—	Series C-1 Preferred Stock	4,309	0	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	X	4,309	A	—	—	Common Stock	4,309	13,662	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	S	104	D	—	—	Common Stock	104	13,558	I
Warrants to Purchase Series C-1 Preferred Stock^F3,F5,F1	$0.12	Oct 22, 2018	X	41,414	D	—	—	Series C-1 Preferred Stock	41,414	0	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	X	41,414	A	—	—	Common Stock	41,414	41,414	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	S	994	D	—	—	Common Stock	994	40,420	I
Series 1 Preferred Stock^F2,F1	—	Oct 22, 2018	C	52,690	D	—	—	Common Stock	52,690	0	I
Series 1 Preferred Stock^F3,F1	—	Oct 22, 2018	C	42,530	D	—	—	Common Stock	42,530	0	I
Series 1 Preferred Stock^F3,F1	—	Oct 22, 2018	C	3,862	D	—	—	Common Stock	3,862	0	I
Series 1 Preferred Stock^F2,F1	—	Oct 22, 2018	C	4,846	D	—	—	Common Stock	4,846	0	I
Series AA Preferred Stock^F3,F1	—	Oct 22, 2018	C	174,699	D	—	—	Common Stock	174,699	0	I
Series AA Preferred Stock^F3,F1	—	Oct 22, 2018	C	13,609	D	—	—	Common Stock	13,609	0	I
Series B Preferred Stock^F3,F1	—	Oct 22, 2018	C	1,044,764	D	—	—	Common Stock	1,044,764	0	I
Series B Preferred Stock^F3,F1	—	Oct 22, 2018	C	94,874	D	—	—	Common Stock	94,874	0	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	C	149,320	D	—	—	Common Stock	149,320	0	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	C	13,558	D	—	—	Common Stock	13,558	0	I
Series C-1 Preferred Stock^F3,F1	—	Oct 22, 2018	C	40,420	D	—	—	Common Stock	40,420	0	I
Series D Preferred Stock^F3,F1	—	Oct 22, 2018	C	272,107	D	—	—	Common Stock	272,107	0	I
Series D Preferred Stock^F3,F1	—	Oct 22, 2018	C	24,709	D	—	—	Common Stock	24,709	0	I
Series D Preferred Stock^F3,F1	—	Oct 22, 2018	C	226,061	D	—	—	Common Stock	226,061	0	I

Explanation of responses

F1Each share of Preferred Stock converted into Common Stock on a one-for-one basis upon the closing of the Issuer's initial public offering and has no expiration date.
F2Catalysta Ventures, LLC ("Catalysta") is under common control with Hatteras Venture Advisors III, LLC ("HVA III"). Catalysta is the general partner of Hatteras Venture Partners I, LP ("HVP I"). The securities held directly by HVP I are indirectly held by Catalysta, which may be deemed to share voting and dispositive power with regard to the securities directly held by HVP I. Catalysta disclaims beneficial ownership of the securities held by HVP I except to the extent of its pecuniary interest therein. The individual managers of Catalysta are Clay B. Thorp and John Crumpler (the "Managers"), who may be deemed to share voting and dispositive power with regard to the securities held directly by Catalysta and HVP I. The Managers disclaim beneficial ownership of the securities held by Catalysta and HVP I except to the extent of their pecuniary interest therein. Mr. Thorp is a director of the Issuer and files Section 16 reports separately.
F3HVA III is the general partner of Hatteras Venture Partners III, LP ("HVP III"), Hatteras Venture Affiliates III, LP ("HV Affiliates") and Venture Capital Multiplier Fund ("Multiplier Fund"). The securities held directly by HVP III, HV Affiliates and Multiplier Fund are indirectly held by HVA III. The individual managers of HVA III are Clay B. Thorp, Robert A. Ingram, Kenneth B. Lee, Douglas Reed, MD and John Crumpler (the "GP Directors"). HVA III and the GP Directors may be deemed to share voting and dispositive power with regard to the securities directly held by HVP III, HV Affiliates and Multiplier Fund. HVA III and the GP Directors disclaim beneficial ownership of the securities held by HVP III, HV Affiliates and Multiplier Fund except to the extent of their pecuniary interest therein. Mr. Thorp is a director of the Issuer and files Section 16 reports separately.
F4Represents the net exercise of the warrants immediately prior to, and contingent upon, the closing of the Issuer's initial public offering.
F5The warrants were exercisable until, and were scheduled to expire upon, the closing of the Issuer's initial public offering.