Revenue
Our revenue for the three months ended March 31, 2023 increased $276.4 million, or 8.6%, to $3,490.1 million as compared to $3,213.7 million for the corresponding period last year.
Our revenue for the six months ended March 31, 2023 increased $392.1 million, or 6.1%, to $6,872.5 million as compared to $6,480.4 million for the corresponding period last year.
The increase in revenue for the three months ended March 31, 2023 was primarily attributable to an increase in our Americas segment of $230.3 million, as discussed further below.
The increase in revenue for the six months ended March 31, 2023 was primarily attributable to an increase in our Americas segment of $346.1 million, as discussed further below.
In the course of providing our services, we routinely subcontract for services and incur other direct costs on behalf of our clients. These costs are passed through to clients and, in accordance with industry practice and GAAP, are included in our revenue and cost of revenue. Because these pass-through revenues can change significantly from project to project and period to period, changes in revenue may not be indicative of business trends. Pass-through revenues for the three months ended March 31, 2023 and 2022 were $1.8 billion and $1.6 billion, respectively. Pass-through revenues for the six months ended March 31, 2023 and 2022 were $3.6 billion and $3.3 billion, respectively. Pass-through revenue as a percentage of revenue was 52% and 50% during the three months ended March 31, 2023 and 2022, respectively. Pass-through revenue as a percentage of revenue, was 52% and 51% during the six months ended March 31, 2023 and 2022, respectively.
Gross Profit
Our gross profit for the three months ended March 31, 2023 increased $18.1 million, or 8.6%, to $228.1 million as compared to $210.0 million for the corresponding period last year. For the three months ended March 31, 2023, gross profit, as a percentage of revenue, was 6.5%, which was the same as in the three months ended March 31, 2022.
Our gross profit for the six months ended March 31, 2023 increased $32.9 million, or 8.0%, to $443.1 million as compared to $410.2 million for the corresponding period last year. For the six months ended March 31, 2023, gross profit, as a percentage of revenue, increased to 6.4% from 6.3% in the six months ended March 31, 2022.
Gross profit changes were due to the reasons noted in Americas and International reportable segments below.
Equity in Earnings of Joint Ventures
Our equity in earnings of joint ventures for the three months ended March 31, 2023 was $7.5 million as compared to $12.0 million in the corresponding period last year.
Our equity in earnings of joint ventures for the six months ended March 31, 2023 was $17.3 million as compared to $19.9 million in the corresponding period last year.
The decreases in earnings of joint ventures for the three and six months ended March 31, 2023 compared to the same period in the prior year were primarily due to decreased earnings in our AECOM Capital segment compared to the prior year.
General and Administrative Expenses
Our general and administrative expenses for the three months ended March 31, 2023 decreased $3.0 million, or 8.1%, to $34.2 million as compared to $37.2 million for the corresponding period last year. For the three months ended March 31, 2023, general and administrative expenses, as a percentage of revenue, decreased to 0.9% from 1.1% in the three months ended March 31, 2022.
Our general and administrative expenses for the six months ended March 31, 2023 decreased $3.8 million, or 5.2%, to $69.8 million as compared to $73.6 million for the corresponding period last year. For the six months ended March 31, 2023, general and administrative expenses, as a percentage of revenue, decreased to 1.0% from 1.1% in the six months ended March 31, 2022.