definiens: means ( A ) the Success Payment Value divided by ( B ) $ 4.00 ( as adjusted for anystock dividend, stock split, combination of shares, reorganization, recapitalization, reclassification or other similarevent).”(b ) The definition of in Section 1 of the Original Letter Agreement is hereby deleted andreplaced in its entirety as follows : means ( i ) March 18, 2016 ( the ), ( ii ) with respect to anySuccess Payment arising as a result of a Company Sale Valuation Date, the earlier of ( a ) the date on which anyproceeds from the Company Sale are paid or distributed to any stockholder, and ( b ) the date that is ninety ( 90 ) daysafter the Company Sale Valuation Date, and ( iii ) with respect to any other Success Payment, the date that is ninety(90 ) days after the Valuation Date pursuant to which such Success Payment obligation arises ; provided, however, that for each of clauses ( i ) through ( iii ), if the applicable Success Payment Date would otherwise fall on a date that isnot a business day, the applicable Success Payment Date shall instead occur on the next following business day . ”(c ) The definition of in Section 1 of the Original Letter Agreement is hereby deleted and replacedin its entirety as follows : is any one of the following dates that occur during the Success Payment Period:(i ) December 19, 2014 ( the ) ; ( ii ) the date on which the Company or a successor [ * * * ] Certain information in this document has been omitted and filed separately with the Securities andExchange Commission . Confidential treatment has been requested with respect to the omitted portions.sells, leases, transfers or exclusively licenses all or substantially all of its assets to another company ( an ) ; ( iii ) the date on which the Company merges or consolidates with or into another entity ( other than a merger inwhich the pre - merger stockholders of the Company own a majority of the shares of the surviving entity ) ( a and with an Asset Sale, a, and the Valuation Dates triggered thereby each a ), ( iv ) the dates on which ARCH Venture Fund VII, L.P. ( ) or CL Alaska L.P., or either of suchentity ’s affiliated entities that hold such shares ( ) transfers a majority of its shares of company capitalstock held by such entity on such date to a third party ; ( v ) every second anniversary of any event described in thepreceding clauses ( i ), ( ii ), ( iii ) or ( iv ) ; and ( vi ) the last day of the Success Payment Period . For the avoidance of doubt, and by way of further explanation of clause ( v ) above, a Valuation Date under clause ( v ), with respect to the IPOValuation Date, occurs on December 19, 2016, December 19, 2018 and every even - numbered year thereafter . ”(d ) The following terms shall have the following meanings for all purposes under the Agreement : means any day other than Saturday, Sunday or other day on which commercial banks in TheCity of New York are authorized or required by law to remain closed