Amazon-backed electric vehicle producer Rivian has begun telling clients who have held the R1S SUV of delivery delays, news sources reported Wednesday.

Its shares fell 4.5% to $114.31 in evening trade.

The company had before said R1S would start creation at the Normal, Illinois plant in December, with the primary deliveries expected in January.

Rivian has now begun sending messages to clients to illuminate them that the delivery window has been changed to among May and July at the most punctual, as per news sources InsideEVs and Electrek.

media couldn’t autonomously confirm the data, and Rivian was not quickly accessible for a remark.

The startup, loaded from a fruitful $100 billion-valued IPO, has declared designs briefly U.S. manufacturing plant and it in the end needs to open plants in Europe and China too. It has not given an area or time span for the second US plant.

Shares of the company had flooded however much 53% in its Nasdaq debut on Nov. 10, solidifying Rivians position as the second most significant U.S. automaker.