Highmore's deal carries an average annual value of $725,000 while Lankinen's pact is worth $800,000 annually. Both are two-way contracts in the first year and transition to one-way deals in the second.
The team also signed forwards Evan Barratt and Andrei Altybarmakyan to three- and two-year, entry-level contracts, respectively. Chicago selected both players in the third round of the 2017 NHL Draft.
Highmore, 24, appeared in 36 games for Chicago in 2019-20, contributing two goals and six points. He also netted four goals and 12 points through 21 games with the AHL's Rockford IceHogs.
Lankinen, 24, owned an 8-10-2 record with a 3.09 goals-against average and .909 save percentage with the IceHogs this season. He led Finland to a gold medal at the 2019 IIHF World Championship, posting a 7-1-0 record with a 1.50 goals-against average and .942 save percentage.