Our total revenues increased by $23.1 million, or 5.7%, to $426.2 million for the three months ended December 27, 2019, compared with $403.1 million for the three months ended December 28, 2018. This increase was primarily due to an increase in our customers’ demand for both optical and
non-optical
communications manufacturing services during the three months ended December 27, 2019. Revenues from optical and
non-optical
communications products increased by $16.5 million and $6.6 million, or 5.4% and 6.8%, respectively, for the three months ended December 27, 2019.
Our total revenues increased by $45.3 million, or 5.8%, to $825.5 million for the six months ended December 27, 2019, compared with $780.3 million for the six months ended December 28, 2018. This increase was primarily due to an increase in our customers’ demand for both optical and
non-optical
communications manufacturing services during the six months ended December 27, 2019. Revenues from optical and
non-optical
communications products increased by $38.1 million and $7.1 million, or 6.5% and 3.7%, respectively, for the six months ended December 27, 2019.
Our cost of revenues increased by $19.5 million, or 5.5%, to $377.1 million, or 88.5% of total revenues, for the three months ended December 27, 2019, compared with $357.5 million, or 88.7% of total revenues, for the three months ended December 28, 2018. This increase in cost of revenues on an absolute dollar basis was in line with the increase in sales volume.
Our cost of revenues increased by $36.0 million, or 5.2%, to $730.4 million, or 88.5% of total revenues, for the six months ended December 27, 2019, compared with $694.4 million, or 89.0% of total revenues, for the six months ended December 28, 2018. This increase in cost of revenues on an absolute dollar basis was in line with the increase in sales volume.
Our gross profit increased by $3.6 million, or 7.9%, to $49.2 million, or 11.5% of total revenues, for the three months ended December 27, 2019, compared with $45.6 million, or 11.3% of total revenues, for the three months ended December 28, 2018. The increase was primarily due to an increase in revenues and effective cost controls.
Our gross profit increased by $9.3 million, or 10.8%, to $95.1 million, or 11.5% of total revenues, for the six months ended December 27, 2019, compared with $85.8 million, or 11.0% of total revenues, for the six months ended December 28, 2018. The increase was primarily due to an increase in revenues and effective cost controls.
Our SG&A expenses increased by $4.4 million, or 34.3%, to $17.1 million, or 4.0% of total revenues, for the three months ended December 27, 2019, compared with $12.7 million, or 3.2% of total revenues, for the three months ended December 28, 2018. The increase was primarily due to (1) an increase in share-based compensation expenses of $1.9 million; (2) an increase in executive and management expenses of $1.2 million; (3) an increase in severance liabilities of $0.3 million; and (4) an increase in new business
start-up
costs of $0.5 million.
Our SG&A expenses increased by $5.9 million, or 21.8%, to $33.1 million, or 4.0% of total revenues, for the six months ended December 27, 2019, compared with $27.2 million, or 3.5% of total revenues, for the six months ended December 28, 2018. The increase was primarily due to (1) an increase in share-based compensation expenses of $3.1 million; (2) an increase in executive and management expenses of $1.8 million; (3) an increase in severance liabilities of $0.6 million; and (4) an increase in new business
start-up
costs of $0.5 million.
Our operating income decreased by $0.5 million to $32.1 million, or 7.5% of total revenues, for the three months ended December 27, 2019, compared with $32.5 million, or 8.1% of total revenues, for the three months ended December 28, 2018. The decrease was primarily due to an increase in SG&A expenses.