[Rivian first quarter revenue of $661 million analyst forecast $660.3 million] Electric car maker Rivian first quarter adjusted loss per share of $1.25, analyst expected loss of $1.56; first quarter revenue of $661 million, analyst forecast of $660.3 million; maintain full year adjusted EBITDA expected loss of $4.5 billion, analyst expected loss of $4.38 billion Maintain full-year production at 50, 000 vehicles, with analysts expecting 51462.