Investing's newest superstar is having a rough month

New York(CNN Business) Cathie Wood of ARK Invest has become one of the top investment voices on Wall Street over the past few years, thanks to big bets on Tesla (TSLA), Square (SQ), Roku (ROKU) and other momentum stocks.

But investors need an iron-cast stomach to deal with the recent gut-wrenching volatility in her company's ARK exchange-traded funds.

The ARK Innovation ETF (ARKK), which has Tesla as its top holding, is just one of the ARK funds that have been on a wild roller coaster ride as of late.

Tesla makes up more than 10% of the fund's assets — so Wood's success is closely aligned with what the market thinks of Elon Musk. Tesla has soared 25% in just the past five days but is still more than 20% off its record high.

As such, the ARK Innovation ETF is up more than 15% in the past week and nearly 200% in the past 12 months. But it's down almost 20% from its 52-week high due to a plunge in the past month.

It's a similar story of big swings for other ARK ETFs that focus on autonomous technology and robotics (ARKQ), genomics (ARKG), next-generation internet services (ARKW) and fintech (ARKF). The company is also planning to launch a space exploration ETF.

But Wood and her colleagues embrace the volatility that comes with investing in momentum stocks.

She wrote in a letter to shareholders at the end of December that "innovation is evolving at such a rapid pace that traditional equity and fixed income benchmarks are being populated increasingly by so-called value traps, stocks and bonds that are 'cheap' for a reason."

Wood added that investors need to avoid these traps by "avoiding industries and companies in the crosshairs of 'creative destruction.'"

Betting that the value rally may not last much longer

CNN Business spoke to ARK Invest's Ren Leggi about the firm's big and bold stock bets. Leggi works closely with Wood on investment decisions as the company's client portfolio manager.

Leggi isn't worried that investors are going to bail on Big Tech companies like Tesla, the FAANGs and other growth companies. He thinks the recent move into banks, oil stocks and retailers is a "short-lived rotation into value stocks."

"Value industries are becoming more and more vulnerable to disruption," Leggi added, noting that Wood and the rest of the ARK team are thinking about investments over a five- to 10-year horizon.

That's why ARK is happy to bet even more on the companies it is most bullish on when their stock prices go down, Leggi said.

"If there are dislocations in market and big sell-offs, that doesn't scare us. It excites us because you can pick up a good stock at a lower price," he said, adding that volatility can create good buying opportunities.

That's why ARK has bought even more Tesla shares during its recent sell-off.

"Cathie has been focusing on Tesla for a long time. She looks at it not just as an automobile manufacturer. You can't compare it to traditional car companies," Leggi said, adding that Tesla's growing clout with autonomous driving technology will lead to even more recurring revenue.

While Wood and ARK are most known for their bullish stance on Tesla, the funds have top holdings in many other innovative companies as well.

Leggi thinks Square will remain a leader in digital payments thanks to its Cash app, and that Roku will remain a leader in streaming video. He noted that Teladoc (TDOC) is a top holding in several ARK funds too because of its leadership in virtual health.

ARK is also unafraid to make big bets on newly public companies. The funds have bought stakes in Big Data giant Palantir and video game platform Roblox shortly after their direct listings.

Too much of a good thing?

The strategy of picking just a handful of potentially big winners is not for the faint of heart, as witnessed by the recent volatility in the funds. ARK Innovation, for example, has nearly half of the fund's assets in its top 10 stocks.

"There has been this recent rough patch, with a correction in super growthy tech stocks," said Jeremie Capron, head of research at ROBO Global, an investment firm with ETFs that focus on robotics, artificial intelligence and health care tech companies.

But Capron said his firm tries to limit how big an individual stock gets to just 2% of their funds' assets. As a result, the top 10 holdings in the ROBO Global Robotics and Automation Index ETF (ROBO) account for less than 20% of the fund's total assets.

"Our investment approach is similar to ARK in that we are focusing on tech. But we're different in that we avoid concentration," Capron said.

The ROBO fund owns about 80 stocks, while ARK funds typically own only about 30 to 50 companies.

Still, Leggi defended ARK's decision to limit the number of stocks it owns. It's more of a go-big-or-go-home approach. He describes Wood's and the rest of the firm's strategy as looking for companies that are an industries where "it's winner takes most."

That's worked well with Tesla — but it will probably lead to even more big swings in the ARK returns going forward.