 RALEIGH, N.C., April 11, 2022 GLOBE NEWSWIRE -- Martin Marietta Materials, Inc. NYSE:MLM Martin Marietta or the Company will host its first-quarter 2022 earnings conference call on Tuesday, May 3, 2022 at 11:00 a.m. Eastern Time. The Company will release results for the quarter ended March 31, 2022, that morning before the market opens. 