national energy services reunited corp. ( nesr ) 777 post oak blvd. 7th floor houston texas 77056 united states of america 6 june 2018 dear sirs, the persons whose names appear on the signature pages to this letter ( the selling stockholders ) refer to the stock purchase agreement dated 12 november 2017 between nesr, hana investments co. wll, nps holdings limited ( nps ) and the selling stockholders ( the agreement ). unless otherwise defined herein, capitalised terms in this letter shall have the meanings given to those terms in the agreement. subject to and conditional upon : ( a ) the satisfaction of nesr ’ s obligations on the nesr closing date ( other than as such obligations are varied on the terms of this letter ) ; and ( b ) ( in addition to the receipt by the selling stockholders of an aggregate amount of us $ 13, 411, 501. 00 from nps on the nesr closing date, in accordance with the agreement ) receipt by the selling stockholders of an aggregate amount equal to us $ 5, 240, 403. 50 ( to be apportioned amongst the selling stockholders in the amounts set forth in the annex hereto ) from nps, as soon as possible but in any case on or prior to 3 july 2018 ( the nps payment ), ( a ) the satisfaction of nesr ’ s obligations on the nesr closing date ( other than as such obligations are varied on the terms of this letter ) ; and ( a ) the satisfaction of nesr ’ s obligations on the nesr closing date ( other than as such obligations are varied on the terms of this letter ) ; and ( b ) ( in addition to the receipt by the selling stockholders of an aggregate amount of us $ 13, 411, 501. 00 from nps on the nesr closing date, in accordance with the agreement ) receipt by the selling stockholders of an aggregate amount equal to us $ 5, 240, 403. 50 ( to be apportioned amongst the selling stockholders in the amounts set forth in the annex hereto ) from nps, as soon as possible but in any case on or prior to 3 july 2018 ( the nps payment ), ( b ) ( in addition to the receipt by the selling stockholders of an aggregate amount of us $ 13, 411, 501. 00 from nps on the nesr closing date, in accordance with the agreement ) receipt by the selling