ARCH Venture Partners X, LLC - Jul 15, 2021 Form 3 Insider Report for Erasca, Inc. (ERAS)

Role: 10%+ Owner
Signature: /s/ ARCH Venture Fund X, L.P., By: ARCH Venture Partners X, L.P., its General Partner, By: ARCH Venture Partners X, LLC, its General Partner, By: Mark McDonnell, attorney-in-fact
Stock symbol: ERAS
Transactions as of: Jul 15, 2021
Transactions value $: $0
Form type: 3
Date filed: 7/15/2021, 09:06 PM
Previous filing: Jun 23, 2021
Next filing: Jul 20, 2021

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	ERAS	Series A Preferred Stock							Jul 15, 2021	Common Stock	1.75M	$0.00	By ARCH Venture Fund X, L.P.	F1, F2, F3
holding	ERAS	Series A Preferred Stock							Jul 15, 2021	Common Stock	1.75M	$0.00	By ARCH Venture Fund X Overage, L.P.	F1, F2, F3
holding	ERAS	Series B-1 Preferred Stock							Jul 15, 2021	Common Stock	2.83M	$0.00	By ARCH Venture Fund X, L.P.	F2, F3, F4
holding	ERAS	Series B-2 Preferred Stock							Jul 15, 2021	Common Stock	944K	$0.00	By ARCH Venture Fund X Overage, L.P.	F2, F3, F4
holding	ERAS	Series B-1 Preferred Stock							Jul 15, 2021	Common Stock	2.83M	$0.00	By ARCH Venture Fund X Overage, L.P.	F2, F4
holding	ERAS	Series B-2 Preferred Stock							Jul 15, 2021	Common Stock	944K	$0.00	By ARCH Venture Fund X Overage, L.P.	F2, F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The shares of Series A Preferred Stock are convertible, at any time, at the holder's election, to shares of the Issuer's common stock at a ratio of 1.2-for-1. In addition, effective immediately prior to the closing of the Issuer's initial public offering of its common stock, each share of Series A Preferred Stock will automatically convert to shares of the Issuer's common stock at a ratio of 1.2-for-1. The Series A Preferred Stock has no expiration date.
F2	ARCH Venture Partners X, L.P. (AVP X LP) is the sole general partner of ARCH Venture Fund X, L.P. (ARCH X). ARCH Venture Partners X Overage, L.P. (AVP X Overage LP) is the sole general partner of ARCH Venture Fund X Overage, L.P. (ARCH X Overage). ARCH Venture Partners X, LLC (AVP X LLC) is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow, Steven Gillis, and Robert Nelsen comprise the investment committee of AVP X LLC (the AVP X Committee Members). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage.
F3	(Continued from Footnote 2) AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to any pecuniary interest therein.
F4	The shares of Series B Preferred Stock are convertible, at any time, at the holder's election, to shares of the Issuer's common stock at a ratio of 1.2-for-1. In addition, effective immediately prior to the closing of the Issuer's initial public offering of its common stock, each share of Series B Preferred Stock will automatically convert to shares of the Issuer's common stock at a ratio of 1.2-for-1. The Series B Preferred Stock has no expiration date.