X0306 4 2021-08-23 0 0001839839 Janus International Group, Inc. JBI 0001246989 FRADIN ROGER C/O JANUS INTERNATIONAL GROUP, INC. 135 JANUS INTERNATIONAL BLVD. TEMPLE GA 30179 1 0 0 0 Common Stock, par value $0.0001 per share ("Common Stock") 2021-08-23 4 S 0 133200 14.68 D 2799499 D Common Stock 574874 I By Juniper GRAT Trust The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $14.57 to $15.00, inclusive. The Reporting Person undertakes to provide to Janus International Group, Inc. ("Janus"), any security holder of Janus, 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 range set forth in this footnote (1) to this Form 4. Shares of Common Stock held directly by The Juniper GRAT Trust. /s/ Scott Sannes, as Attorney-in-Fact for Roger Fradin 2021-08-24