https://www.reuters.com/article/us-tesla-stocks/so-high-tesla-shares-cross-420-mark-over-a-year-after-musk-buyout-tweet-idUSKBN1YR1VL >Tesla Inc shares traded above $420 on Monday, more than a year after Elon Musk tweeted he had "funding secured" to take the electric car maker private at that price, only to later give up under investor pressure and regulatory concerns.