GALVESTON, TX — American National Insurance Company (NASDAQ: ANAT) announced net income for the second quarter of 2019 of $98.8 million or $3.67 per diluted share, up from $84.1 million or $3.12 per diluted share for the same period in 2018. Net income for the second quarter of 2019 included after-tax net gains on equity securities of $53.0 million or $1.97 per diluted share, as compared to after-tax net gains of $45.2 million or $1.68 per diluted share in the second quarter of 2018.In addition, net income for the second quarter of 2019 included after-tax realized investment earnings of $6.4 million or $0.23 per diluted share compared to $9.1 million or $0.34 per diluted share for the same period in 2018.
Net income for the six months ended June 30, 2019 was $357.1 million or $13.28 per diluted share, up from $102.9 million or $3.82 per diluted share for the same period in 2018. Net income for the six months ended June 30, 2019 included after-tax net gains on equity securities of $216.0 million or $8.03 per diluted share, as compared to after-tax net gains of $19.0 million or $0.71 per diluted share for the same period in 2018.In addition, net income for the six months ended June 30, 2019 included after-tax realized investment earnings of $42.0 million or $1.56 per diluted share compared to $10.0 million or $0.37 per diluted share for the same period in 2018. The increase in realized investment earnings was primarily due to the sale of certain real estate holdings in unconsolidated joint ventures during the six months ended June 30, 2019.
After-tax adjusted operating income for the second quarter of 2019 increased to $39.4 million or $1.47 per diluted share compared to $29.8 million or $1.10 per diluted share for the same period in 2018. After-tax adjusted operating income for the six months ended June 30, 2019 increased to $99.1 million or $3.69 per diluted share compared to $73.9 million or $2.74 per diluted share for the same period in 2018. The increase in 2019 adjusted operating income compared to the same periods in 2018 is primarily attributable to increased operating income from our Property & Casualty and Life segments.