Mount Atlas is the second of six foals out of Highland Pass (Passing Glance), who won three races, and is the best of her three winners. His half-brothers are the dual winner Solar Pass (Phoenix Reach) and the winner Broza Beach (Shirocco).

Second dam Lady Brora (Dashing Blade) won at three and has eight other winners, among them Elm Park (Phoenix Reach), winner of the Gr.1 Futurity Trophy (then the Racing Post Trophy) and a sire, and Brorocco (Shirocco), who won four races and was twice Group-placed, including at Group 2 level.

Third dam Tweed Mill (Selkirk) won at three and produced three other winners, including Tweedledrum (Beat Hollow), a Listed winner who was placed in the Gr.1 Long Walk Hurdle.

This is the family of Risk Me (Sharpo), a dual Group 1 winner and sire.

Coming through for Highland Pass are a yearling filly by Study Of Man plus a filly foal by Ulysses.