Rivian has released its S-1 filing in preparation for one of the biggest IPOs of the year. I go step by step through the highlights of the filing to analyze Rivian's financials, business, valuation, and what I think will happen after the IPO. Overall, I think Rivian is a cool startup with a lot of potential but absurdly overvalued at $80B, and worth more like $5-10B at most. I'can't wait to see what happens when it starts trading.