Here is the relevant excerpt from Teslas employee stock purchase program:
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The employee stock purchase program is divided into six month time periods with two purchase dates: Feb 26th and Aug 31st.
First period is Sept 1 - Feb 26th
Second period is March 1st - Aug 31st
What is interesting is how Tesla determines the price for the shares.
Tesla looks at the closing price on the first and last trading days of the period. For the Feb purchase this could be Sept 1 and Feb 26th assuming both days are trading days.
Tesla then takes the lower of the two closing prices, applies a 15% discount on the lower price, and applies this share price as the purchase price for employees.
So the important dates are Sept 1st and Feb 26th, and also March 1st and Aug 31st. Since the dates are adjoining at the beginning and end of each period we can just focus on the purchase dates: Feb 26th and Aug 31st.
Here is how a beneficial stock buyback program could work:
For the time period Sept 1st to Feb 26th. Take the closing price on Sept 1st and apply the 15% discount that employees will receive. This will be the share floor that activates the buyback program. Between Sept 1st and Feb 26th anytime the closing share price breaks below this number Tesla may buyback shares.
This can be applied to the March 1st to aug 31st time period as well. The amount of the buyback would be up to Tesla to decide.
This works under the theory that, in the long run, Tesla will continue to grow and increase profitability so any drops in share price are temporary and likely exacerbated by Fud and shorting.