Operating Income. Operating income was $458.6 million for the three-months ended September 30, 2020, an increase of approximately $63.2 million, or 16.0% higher than operating income of $395.4 million for the three-months ended September 30, 2019. Operating income as a percentage of net sales increased to 36.8% for the three-months ended September 30, 2020 from 34.9% for the three-months ended September 30, 2019. Operating income was $96.6 million and $72.6 million for the three-months ended September 30, 2020 and 2019, respectively, for our operations in EMEA, Asia Pacific and South America.
Operating income for the Monster Energy® Drinks segment, exclusive of corporate and unallocated expenses, was $502.4 million for the three-months ended September 30, 2020, an increase of approximately $68.5 million, or 15.8% higher than operating income of $433.8 million for the three-months ended September 30, 2019. The increase in operating income for the Monster Energy® Drinks segment was primarily the result of the $102.0 million increase in net sales and the $12.5 million decrease in operating expenses for the three-months ended September 30, 2020.
Operating income for the Strategic Brands segment, exclusive of corporate and unallocated expenses, was $43.9 million for the three-months ended September 30, 2020, an increase of approximately $8.8 million, or 25.0% higher than operating income of $35.1 million for the three-months ended September 30, 2019. The increase in operating income for the Strategic Brands segment was primarily the result of the $8.0 million increase in net sales, offset by a decrease of $2.2 million in advertising costs and a $1.4 million decrease in sponsorship and endorsement costs.
Operating income for the Other segment, exclusive of corporate and unallocated expenses, was $2.4 million for the three-months ended September 30, 2020, an increase of approximately $1.4 million, or 135.5% higher than operating income of $1.0 million for the three-months ended September 30, 2019.
Interest and Other (Expense)/Income, net. Interest and other non-operating (expense)/ income, net, was ($4.6) million for the three-months ended September 30, 2020, as compared to interest and other non- operating (expense)/ income, net, of $3.1 million for the three-months ended September 30, 2019. Foreign currency transaction losses were $4.8 million and $2.8 million for the three-months ended September 30, 2020 and 2019, respectively. Interest income was $1.5 million and $6.1 million for the three-months ended September 30, 2020 and 2019, respectively.
Provision for Income Taxes. Provision for income taxes was $106.4 million for the three-months ended September 30, 2020, an increase of $6.7 million, or 6.8% higher than the provision for income taxes of $99.6 million for the three-months ended September 30, 2019. The effective combined federal, state and foreign tax rate decreased to 23.4% from 25.0% for the three-months ended September 30, 2020 and 2019, respectively. The decrease in the effective tax rate was primary attributable to lower income taxes in certain foreign jurisdictions as well as an increase in the equity compensation deduction.
Net Income. Net income was $347.7 million for the three-months ended September 30, 2020, an increase of $48.7 million, or 16.3% higher than net income of $298.9 million for the three-months ended September 30, 2019. The increase in net income was primarily due to the $63.5 million increase in gross profit for the three-months ended September 30, 2020.
Results of Operations for the Nine-Months Ended September 30, 2020 Compared to the Nine-Months Ended September 30, 2019.
Net Sales. Net sales were $3.40 billion for the nine-months ended September 30, 2020, an increase of approximately $218.7 million, or 6.9% higher than net sales of $3.18 billion for the nine-months ended September 30, 2019. The COVID-19 pandemic had an adverse impact on net sales for the nine-months ended September 30, 2020. Net changes in foreign currency exchange rates had an unfavorable impact on net sales of approximately $41.1 million for the nine-months ended September 30, 2020.
Net sales for the Monster Energy® Drinks segment were $3.18 billion for the nine-months ended September 30, 2020, an increase of approximately $232.7 million, or 7.9% higher than net sales of $2.95 billion for the nine-months ended September 30, 2019. Net sales for the Monster Energy® Drinks segment increased primarily due to increased worldwide sales by volume of our Monster Energy® brand energy drinks and increased sales by volume for our Reign Total Body Fuel® high performance energy drinks, both as a result of increased consumer demand . The COVID-19 pandemic had an adverse impact on net sales of the Monster Energy® Drinks segment for the nine-months ended September 30, 2020. Net changes in foreign currency exchange rates had an unfavorable impact on net sales for the Monster Energy® Drinks segment of approximately $38.3 million for the nine-months ended September 30, 2020.