IKCO manufactured 188,389 vehicles, registering a drop of 1.8 percent compared to the same period last year, IRNA reported.
SAIPA produced 173,311 vehicles in the said period, three percent more than the figure for the five-month period of the previous year.
Pars Khodro also manufactured 24,821 vehicles in the period under review, 5.6 percent lower than the figure for the same period last year.
In the said five months, passenger cars had the lion’s share in the country’s car production, with 91.8 percent of the total, 354,541 cars.
Also, 27,804 pickup trucks were produced by Iranian manufacturers during the five months to August 22.
The country also produced 63,251 vehicles during the month to August 22, registering 4.9 percent rise compared to corresponding figure for last year.
IKCO, SAIPA, and Pars Khodro manufactured 900,714 vehicles in the previous Iranian year (ended on March 20), which was 4.3 percent more than the figure of the preceding year.
The Iranian Ministry of Industry reported a 19.1 percent surge in car production for the last Iranian year.
It expects output to increase by over 21 percent this Iranian year, to 1.2 million units.
Iran has seen a major boom in its homegrown automotive industry in recent years as major international brands have almost no presence in a market affected by US sanctions.
Experts say the increased output has become possible thanks to growing investment in local manufacturing of auto parts that used to be imported.