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Likewise from http://www.civilwardata.com/active/hdsquery.dll?RegimentHistory?1363&U - he is a Major and a Lieutenant Colonel. A company is typically commanded by a more junior officer.
Here's a interesting link - https://www.loc.gov/exhibits/lincoln/interactives/long-journey-home/apr_22/pdf/602b1.pdf. Lt. Col. Henry C. Allen of the 106th New York Volunteers is one of five soldiers standing the 9th Watch from 4:00 a.m. to 6:00 a.m. in the Guard of Honor over the body of Abraham Lincoln during its time in New York.
That is really interesting such a great historical detail that nobody probably knew about