 Dallas, Texas, Aug. 04, 2021 GLOBE NEWSWIRE -- NL Industries, Inc. NYSE: NL today reported net income attributable to NL stockholders of 12.7 million, or .26 per share, in the second quarter of 2021 compared to net income attributable to NL stockholders of 4.6 million, or .09 per share, in the second quarter of 2020. NL results include an unrealized gain of 4.5 million in the second quarter of 2021 related to the change in value of marketable equity securities compared to a 2.2 million unrealized loss in the second quarter of 2020. For the first six months of 2021, NL reported net income attributable to NL stockholders of 26.0 million, or .53 per share, compared to net income of 6.5 million, or .13 per share for the first six months of 2020. NL results include an unrealized gain of 10.9 million in the first six months of 2021 related to the change in value of marketable equity securities compared to a 14.3 million unrealized loss in the first six months of 2020. 