X0306 4 2019-12-04 1 0001761940 Diamond S Shipping Inc. DSSI 0001544731 First Reserve GP XII Ltd 290 HARBOR DRIVE, FIFTH FLOOR STAMFORD CT 06902 0 0 1 0 0001544730 First Reserve GP XII, LP 290 HARBOR DRIVE, FIFTH FLOOR STAMFORD CT 06902 0 0 1 0 0001442289 FIRST RESERVE FUND XII LP 290 HARBOR DRIVE, FIFTH FLOOR STAMFORD CT 06902 0 0 1 0 0001442290 FR XII A PARALLEL VEHICLE LP 290 HARBOR DRIVE, FIFTH FLOOR STAMFORD CT 06902 0 0 1 0 Common Stock, $0.001 par value per share 2019-12-04 4 S 0 603241 13.75 D 3549860 I See Footnotes 3,487,257 shares of common stock are held directly by First Reserve Fund XII, L.P. ("Fund XII") after the sale of 592,603 shares of common stock reported herein. 62,603 shares of common stock are held directly by FR XII-A Parallel Vehicle, L.P. ("Parallel Vehicle") after the sale of 10,638 shares of common stock reported herein. This form is filed jointly by First Reserve GP XII Limited ("GP XII Limited"), First Reserve GP XII, L.P. ("GP XII"), Fund XII, and Parallel Vehicle. GP XII Limited is the general partner of GP XII, which in turn is the general partner of each of Fund XII and Parallel Vehicle. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein, and this report shall not be deemed an admission that the reporting persons are the beneficial owners of the reported securities for purposes of Section 16 or for any other purpose. FIRST RESERVE GP XII LIMITED, By: /s/ Anne E. Gold, Name: Anne E. Gold, Title: Chief Compliance Officer, Secretary & Assistant Treasurer 2019-12-05 FIRST RESERVE GP XII, L.P., , by First Reserve GP XII Limited, its general partner, By: /s/ Anne E. Gold, Name: Anne E. Gold, Title: Chief Compliance Officer, Secretary & Assistant Treasurer of the general partner 2019-12-05 FIRST RESERVE FUND XII L.P., by First Reserve GP XII, L.P., its general partner, By: /s/ Anne E. Gold, Name: Anne E. Gold, Title: Chief Compliance Officer, Secretary & Assistant Treasurer of the general partner 2019-12-05 FR XII A PARALLEL VEHICLE, L.P., by First Reserve GP XII, L.P., its general partner, By: /s/ Anne E. Gold, Name: Anne E. Gold, Title: Chief Compliance Officer, Secretary & Assistant Treasurer of the general partner 2019-12-05