Nov 7 (Reuters) - Rivian posted its first drop

in quarterly revenue on Thursday since the electric vehicle

maker went public three years ago.

Due to short supply of a part Rivian last month slashed its

full-year production forecast to between 47,000 and 49,000

vehicles, from its earlier projection of 57,000 units.

This would mean a decline in annual production from last

year for the Amazon.com ( AMZN )-backed company. However it

expects deliveries to grow to between 50,500 and 52,000 vehicles

in 2024, from 50,122 units last year.

Revenue in the third quarter slumped 34.6% to $874 million,

missing analysts' average estimate of $989.6 million, according

to data compiled by LSEG.

EV startups like Rivian and Saudi PIF-backed rival Lucid

have been burning cash as they grapple with ballooning

costs to ramp up production to take on market leader Tesla

.

Loss-making Rivian is set to post its first adjusted core

profit only in the third quarter of 2026, according to LSEG data

and analysts have said that the company may need to raise funds

in the next two years to shore up cash balances.

It posted a net loss of $1.1 billion for the July-September

quarter, compared with a loss of $1.37 billion a year earlier.

In the quarter ended Sept. 30, Rivian said its cash and cash

equivalents were $5.4 billion, compared with $7.86 billion in

the fourth quarter of last year.

Rivian also announced a multi-year supply deal for batteries

with LG Energy Solution's Arizona subsidiary for its

R2 midsized SUV.

The agreement will help the EV maker stick to the domestic

manufacturing requirements as part of the Biden Administration's

Inflation Reduction Act, which provides incentives for EV

buyers.