I do not think a repurchase is realistic. They probably ended q2 around 1.5-1.6 billion, which is too close for comfort in case of some unforeseen event. They'll be able to show cash growth in q3, and the sp would have recovered.
Trying to eke out that little bit with repurchase is not worth much in the big scheme of things.
Your $1.5 - $1.6 billion in Cash & Equivalents at Q2 end looks reasonable as does your conclusion.
At the end of Q1, (ignoring restricted cash) the Cash & Equivalents balance was $2.7 billion, having dropped $702 million during the quarter. During Q1, Tesla gained about $90 million in cash by transferring almost all of the direct-lease vehicles to the ABS debt issue and repaying related Warehouse line draws, so essentially a non-recurring benefit that reduces future gross margin and cash from those transferred direct leases.
Inventory will be a large consumer of cash during Q2. Changes compared to the prior quarter include:
-S & X in-house inventory increased by 1,256 vehicles while S & X in-transit dropped by 168. At a carrying cost of $85k/vehicle that uses an additional $92 million.
-M3 in-house inventory increased by 1,012 vehicles while M3 in transit increased by 9,126. At a carrying cost of $40k/vehicle that uses an additional $ 406 million.
-as M3 production ramps there will also be increased use of cash for Raw Material, Work-in-Progress, and Parts Inventory. Total Inventory increased by ~$300 million during Q1. I'll guess it will increase by closer to $700 million during Q2.
Q3 will increase Cash over the balance at the end of Q2, but luvb2b's latest estimate of the year-end balance only gets back to $2.0 billion and Tesla has to redeem $0.92 billion in 2019 notes by March 1, 2019
In 4 days last week, 57.4 million shares traded. It was a high volume week, but using the arithmetic average of the high & low trades, that's about $19 billion in trades. Any open market buy-backs by Tesla may be indiscernible in share price movements. Also, Tesla has sold follow-on equity every year since the IPO (other than in 2014 when it sold $2.3 billion in convertible notes.) Tesla's expansion plans for completing GF-1, financing GFs 3-X (?), the Semi, MY, and TE projects will all require new capital. For a open-market buy-back to make sense, Tesla would need reasonable assurances that any new equity offering would be higher than the price of shares bought back
What ever cash Tesla has ought to be deployed in its own operations rather than dabbling in the market.