Are they not already owned by Honeywell?
Maybe not...
from Wikipedia
"On October 1, 2018, Garrett Motion Inc. became an independent publicly-traded company through a pro rata distribution of Garrett shares to Honeywell’s stockholders. Each Honeywell stockholder of record received one share of Garrett common stock for every 10 shares of Honeywell common stock held on the record date. Approximately 74 million shares of Garrett common stock were distributed on October 1, 2018, to Honeywell stockholders"
I guess that could explain the issue.