The P/E Ratio has slowly been climbing again in Q3 which is encouraging, but the overall slope over the past year has been declining. I expect that a trailing P/E ratio of between 70-90 for the coming few quarters until the next Big Thing.
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When it comes to PE/growth ratios, Investors have to factor in the terminal growth rate for Tesla, once the company has scaled to 20 million cars annually. Yes, Elon has said that he thinks 50% annual growth (on average) will be possible to get to 20 million vehicles in ~2030, but he has also made fun of ridiculous long term growth assumptions that end up bigger than the known universe - acknowledging that eventually there is an end to fast paced growth.
When it comes to vehicles, It is entirely reasonable to model growth slowing as we approach 2030, and after that date reducing to growth below 20%, which would still be an extremely high volume increase of up to 4 million additional units in 2031 if 2030 is 20 million units, probably better to use a terminal rate closer to 10% post 2030.
Tesla‘s mission to 20 million cars probably looks like an S curve - and while at 50% growth we are in the steep ascent on that curve, but as we approach 20 million it flattens out, along with the growth rate - and so does its forward expected growth multiple valuation.
Tesla Energy will follow a similar trajectory - but with lower product margins as its more of a commodity product lines (others disagree probably).
Now if you are a believer in RoboTaxis & Optimus/AI and other future non-vehicle tesla product lines conquering the world - then you dont care about a terminal growth rate for vehicles and energy post 2030, because you think that profits from those alternative product lines will continue to drive high tesla growth rates for many decades to come (I actually am closer to this way of thinking, especially on Optimus).
But currently to Wall Street and vast majority of institutional investors TESLA = CARS, and their valuation models are mostly based on that. They wont start including Energy or Services properly until it starts generating significant profits past the current rounding error size, and it definitely wont start including Optimus/Robotaxi in valuation models etc until they are shipping products.
At present most institutional valuations are assuming tesla growth rate slows significantly by the end of this decade, and that tesla gets nowhere near 20 million annual vehicle run rate. The current PE ratio reflects that.