She has been with us since 2004, having most recently been Vice President of Finance and Investor Relations.
For those who have followed us over the years, you may recall that Orkin was acquired by Rollins in 1964 and as the original company, that first started our venture into pest control.
Today, Orkin remains our largest brand, employing over 8,000 team members and completing millions of services annually worldwide.
Revenue increased 15.3% to $63.2 million compared to $553.3 million for the second quarter of last year.
Net income grew to $98.9 million, or $0.20 per diluted share, compared to $75.4 million, or $0.15 per diluted share, for the same period in 2020.
For the quarter, we experienced solid growth in all our business lines with residential increasing 13.6% and termite, 16.3% over second quarter 2020.
Additionally, commercial, excluding fumigation, delivered an impressive 17.4% growth over second quarter last year.
This is also an improvement of 11.3% growth over two years ago when we weren't experiencing COVID-related shutdowns.
Even as we were all entering a different economic time back in Q2 of last year, our revenue grew at a steady 5.6%.
That was converted into net income growth of 17.2%.
Keys to the quarter included pricing strength, positively impacting revenue growth, continued mosquito service revenue improvement over 30% and commercial pest control revenue improving significantly.
Additionally, for the first time, our mosquito service revenue has surpassed our bedbug revenue in this quarter was over 3% of our total revenue.
The second quarter revenues of $638.2 million was an increase of 15.3% over the prior year's second quarter revenue of $553.3 million.
Our income before income taxes was $133.9 million, or 29.4% above 2020.
Our net income was $98.9 million, up 31.2% compared to 2020.
Our earnings per share were $0.20 per diluted share compared to $0.15 in 2020, or a 33.3% increase.
For the first six months of 2021, revenues were $1.174 billion, which was an increase of 12.7% over the prior year's first six months revenue of $1.014 billion.
Our GAAP income before income taxes was $253.8 million, or 59.7% above 2020.
Our GAAP net income was $191.5 million, or 61.4%, compared to 2020.
Our GAAP earnings per share or earnings per were $0.39 per diluted share compared to $0.24 per diluted share in 2020.
We maintained consistent revenue growth of 5.6% in 2020, followed by a healthy increase of 15.3% in 2021.
Our total revenue increased for the quarter, up 15.3% and included 1.7% from significant acquisitions with the remaining 13.6% from pricing and new customer growth.
Residential pest control made up 40% of our revenue; commercial pest control, 33%; and termite and other services made up approximately 21% of our revenue.
Again, total revenue less significant acquisitions, was up 13.6%.
From that, residential was up 12.3%; commercial, excluding fumigation, increased 14.8%; and termite and ancillary grew by 14.9%.
In total, our gross margin decreased to 53.3% from 53.8% in the prior year's quarter.
Improvements were made in total payroll but were negatively offset by higher overall fleet costs and a write-down of inventory of $2.7 million related to our PPE, or personal protective equipment.
Depreciation and amortization expenses for the quarter increased $1.4 million to $23.3 million, an increase of 6.3%.
Amortization of intangible assets increased $1.3 million due to several acquisitions, including McCall Service in December 2020 and Adams Pest in Australia in July of last year.
Sales, general and administrative expenses presented a 7.1% improvement for the quarter over 2020, decreasing from 30.9% of revenues to 28.7% of revenues in 2021.
As for our cash position, for the six months ending 6/30/2021, we spent $28.4 million on acquisitions compared to $56 million in the same period last year.
We paid $79.7 million on dividends and had $13.2 million of capex compared to $12.4 million in 2020.
We ended the period with $128.5 million in cash, of which $73.6 million is held by our foreign subsidiaries.
Yesterday, the Board of Directors approved a regular cash dividend of $0.08 per share that will be paid on September 10, 2021, to stockholders of record at the close of business August 10, 2021.

Summary:
Net income grew to $98.9 million, or $0.20 per diluted share, compared to $75.4 million, or $0.15 per diluted share, for the same period in 2020.
The second quarter revenues of $638.2 million was an increase of 15.3% over the prior year's second quarter revenue of $553.3 million.
Our earnings per share were $0.20 per diluted share compared to $0.15 in 2020, or a 33.3% increase.