X0306 4 2021-05-03 0001163739 NABORS INDUSTRIES LTD NBR 0001334321 Restrepo William J C/O NABORS CORPORATE SERVICES, INC. 515 W. GREENS RD., SUITE 1200 HOUSTON TX 77067 1 Chief Financial Officer Common Stock 2021-05-03 4 C 0 991 0 A 91347 D 6.00% Mandatory Convertible Preferred Shares, Series A 0 2021-05-03 4 C 0 7230 0 D Common Stock 991 0 D On May 3, 2021, the mandatory conversion date, each of the 7,230 shares of 6.00% Mandatory Convertible Preferred Shares, Series A (the "Preferred Shares"), held by the Reporting Person was automatically converted into 0.1372 of the Issuer's common shares, for a total of 991 common shares. The Reporting Person also received cash in lieu of fractional common shares pursuant to the mandatory conversion. The acquisition of the Preferred Shares on February 27, 2020 was originally inadvertently disclosed on Table I to a Form 4 filed on February 27, 2020. Mandatory conversion date of May 3, 2021. /s/ Mark D. Andrews by Power of Attorney for William Restrepo 2021-05-05