Elon Musk is getting a laugh out of a 503-day-old marijuana joke that securities regulators didn’t find so funny.

Tesla Inc. climbed above $420 for the first time Monday as fresh financing arranged from banks in China added to optimism supporting a months-long rally.

Musk, who was sued by the U.S. Securities and Exchange Commission last year for falsely tweeting he had funding to take the company private at that price, cracked a joke about the development on his favorite social-media platform.

Tesla advanced as much as 4% to $422.01, rising a fourth consecutive day. The electric-car maker is said to have lined up more than 10 billion yuan ($1.4 billion) in financing from local banks for its Shanghai factory as it prepares to begin deliveries of China-made Model 3 sedans in the country. An announcement will probably be made as soon as this week, according to a person familiar with the matter.

The SEC said in September 2018 that Musk picked $420 as the price at which Tesla would go private to make a weed joke that would impress his girlfriend. In cannabis culture, April 20, or 4/20, is celebrated as a day for smoking marijuana.

Musk and Tesla each agreed to pay $20 million penalties as part of a settlement that barred him from serving as chairman for three years. The company also added new independent directors to its board and was required to hire or designate a securities lawyer to pre-approve certain social-media posts by its billionaire co-founder.

Tesla shares (TSLA) have now surged about 66% since reporting a surprise profit on Oct. 23. In addition to starting sales of locally built Model 3s in China soon, the company has accelerated the introduction of its newest model, the Model Y crossover, to the summer of next year, rather than the fall.