According to figures by shatanews.ir, the production by the trio was just one percent more than the corresponding figure of its preceding year which 203,334.
During the said three months, IKCO manufactured 97,230 vehicles, registering a slight rise of just 0.57 percent compared to the same period last year.
SAIPA produced 81,669 vehicles in the three-month period, 2.7 percent more than the related output of the previous year.
Pars Khodro also manufactured 24,630 vehicles in the period under review, 9.23 percent lower than the figure for the same time span of the past 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 its preceding year.
The Iranian Ministry of Industry reported a 19.1 percent surge in car output for the last Iranian year.
The ministry expects output would 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.