Shares of Apple and Tesla rose sharply on Monday, the to start with day soon after their lately announced inventory splits took influence, as buyers continued to pile into the common names.

Apple advanced 4% and was the finest-carrying out part in the Dow Jones Industrial Ordinary. Tesla, meanwhile, jumped close to 10%.

Monday’s gains are just the hottest in a string of solid performances considering that the two firms declared they would be splitting their shares.

Apple reported July 30 its board approved a 4-for-1 stock break up. Considering that then, the stock is up more than 32%. Tesla declared a 5-for-1 inventory break up on Aug. 11 and the inventory has skyrocketed additional than 70% considering that then.

Having said that, famous investor Leon Cooperman thinks these run-ups on the back again of inventory-split announcement are a troublesome signal for the industry.

“Glimpse at Tesla and Apple: Everyone understands that [stock] splits will not produce worth,” Cooperman, the founder of Omega Advisors, advised CNBC’s “Squawk Box” on Monday. “My dad when advised me if you gave me five singles for a $5 bill, I am no superior off.”

Monday’s gains in Apple and Tesla come amid significant volume as scaled-down traders are able to snap up shares in both equally firms at a significantly reduce value stage than Friday.

As a result of the initial hour and  a 50 % of Monday’s session, Apple experienced traded 82.7 million shares, which is roughly 46% of the stock’s 30-day volume typical of 178.588 million. Tesla shares experienced exchanged hands 37.4 million situations, a lot more than 50 % of its 30-working day volume common of 73.369 million.

This 12 months, scaled-down traders have been additional actively participating in the industry as fee-absolutely free on line brokerage Robinhood grows in attractiveness. But Cooperman sees this as a likely indication of staying overheated.

“I see indicators of euphoria creeping into the sector: the IPO SPAC market is a single, [and] the craziness in several of the stocks that the Robinhood crowd has latched onto,” Cooperman claimed. “You see a Kodak go from $1.50 to $60 and from $60 to $6 in a really quick interval of time … and when you glance into it, it is the Robinhood crowd taking it up.”

Subscribe to CNBC Pro for unique insights and evaluation, and dwell business working day programming from about the world.