 Dallas, Texas, May 05, 2021 GLOBE NEWSWIRE -- NL Industries, Inc. NYSE: NL today reported net income attributable to NL stockholders of 13.3 million, or .27 per share, in the first quarter of 2021 compared to net income attributable to NL stockholders of 1.9 million, or .04 per share, in the first quarter of 2020. NL results include an unrealized gain of 6.4 million in the first quarter of 2021 related to the change in value of marketable equity securities compared to an unrealized loss of 12.1 million in the first quarter of 2020. 