X0306 4 2021-12-06 0 0000277135 W.W. GRAINGER, INC. GWW 0001187060 HOWARD JOHN L 100 GRAINGER PARKWAY LAKE FOREST IL 60045 0 1 0 0 Sr. VP and General Counsel Common Stock 2021-12-06 4 M 0 9728 231.88 A 30295 D Common Stock 2021-12-06 4 S 0 1100 493.1054 D 29195 D Common Stock 2021-12-06 4 S 0 696 493.8303 D 28499 D Common Stock 2021-12-06 4 S 0 1500 495.3063 D 26999 D Common Stock 2021-12-06 4 S 0 1623 496.6968 D 25376 D Common Stock 2021-12-06 4 S 0 2168 497.537 D 23208 D Common Stock 2021-12-06 4 S 0 1232 498.3647 D 21976 D Common Stock 2021-12-06 4 S 0 1409 499.5148 D 20567 D Common Stock 19000 I Family Trust Stock Option 231.88 2021-12-06 4 M 0 9728 0.00 D 2018-04-01 2025-03-31 Common Stock 9728 0 D Stock Option 234.38 2019-04-01 2026-03-31 Common Stock 12390 12390 D Stock Option 231.20 2020-04-03 2027-04-02 Common Stock 8607 8607 D Stock Option 276.64 2021-04-02 2028-04-01 Common Stock 8979 8979 D Stock Option 311.26 2029-03-31 Common Stock 5977 5977 D Transaction pursuant to a previously adopted Rule 10b5-1 trading program. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $492.62 to $493.61, inclusive. The reporting person undertakes to provide W.W. Grainger, Inc., any security holder of W.W. Grainger, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2), (3), (4), (5), (6), (7), and (8). The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $493.62 to $494.02, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $495.00 to $495.83, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $496.00 to $496.97, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $497.01 to $497.94, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $498.06 to $499.03, inclusive. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $499.07 to $499.95, inclusive. Shares held in a family trust of which the reporting person's spouse and children are beneficiaries. The reporting person has sole voting and investment power with respect to all shares held by the family trust. The stock option will fully vest in three years, where 1/3 shall vest on April 1, 2020, 1/3 shall vest on April 1, 2021, and the remainder shall vest on April 1, 2022. Hugo Dubovoy, Jr., as attorney-in-fact 2021-12-07