DXYZ soars 10% in overnight trading as Tesla stock tops the $400 milestone.

There doesn't seem to be much stopping Tesla from topping old highs. Fairlead Strategies founder and market technician Katie Stockton is looking at patterns that could see shares hit $429. The charts bode "well for new highs, above the 2021 high," she tells Barron's.

ChartSmarter founder and market technician Douglas Busch believes $480 is in play, adding that he's observed recent call buying in Tesla stock with a $710 strike price.

Call options give the holder the right to buy a stock at a fixed price in the future. Call buyers buying Tesla options at $710 are making a big bet on either the short-term stock move or volatility in Tesla stock -- or both. (Call buyers don't have to hold options to maturity. They can make money as stock prices gain or volatility picks up.)

"Too many [investors] are calling for a top," added Busch. It "won't happen until the chatter dies down."

Technical analysts aren't making fundamental calls on stock prices. They can help fundamentally minded investors understand what traders and other investors are thinking. Right now, the latter group is thinking Tesla stock can work higher.