It’s been a rough year to invest in stocks, with the stock market going through a seemingly never-ending cycle of volatility. The major US indexes fell last week, with the Dow Jones Industrial Average ending the week at 29,888.78 – just a day after it fell below the key 30,000 level for the first time since January 2021. Meanwhile, the S&P 500 posted its worst week since 2020 and the Nasdaq Composite ended the week 4.8% lower. And with the Fed poised to pursue a more aggressive policy of rate hikes, that could trigger even more volatility in equities. Venture capitalist Kevin O’Leary believes that trying to correct the market is futile. “I can’t time the market. I can’t. I’ve tried so many times, but you can’t,” O’Leary, president at O’Leary Ventures, told CNBC’s “Squawk Box Asia” on Thursday. Instead, he prefers to own companies that he considers sustainable. O’Leary said: “What I like to own are non-zero companies. Moderna isn’t zero, Pfizer isn’t zero and Nestle isn’t zero. They have businesses. very sustainable”. Moderna and Pfizer are both pharmaceutical companies – an area that typically enjoys substantial cash flow and steady dividends and is therefore considered more resilient to a downturn. Both companies are at the forefront of global Covid-19 vaccination efforts. The U.S. Food and Drug Administration on Friday approved Pfizer’s three-dose vaccine for children 6 months to 4 years old, and Moderna’s two-dose vaccine for children 6 months to 5 years old. Biopharma stock currently accounts for about 4.5% of O’Leary’s portfolio, while the broader healthcare sector accounts for about 20%. Investors also prefer consumer staples like Nestle because they are less susceptible to economic cycles and enjoy relatively steady earnings growth and dividend payments. “I own companies with strong balance sheets and make money. Now their stock prices go up and down based on people’s perception of what the price-to-earnings ratio should be. And even care Healthcare hasn’t escaped the downturn, either, but he added.In addition to their strong balance sheets, O’Leary also likes these companies for their good cash flow – part of which is financed redistributed to investors in the form of dividends Three stocks are all in the red this year, but Nestle and Pfizer continue to pay dividends Nestle has a 2.6% dividend yield, while Pfizer is 3.4% Moderna currently pays no dividend ‘Never more than 20% in any sector’ The massive market correction this year has certainly taken some investors by surprise, but O’Leary isn’t fazed by the short-term drop in price, in fact, he’s doubling down on names he believes in. “We weren’t successful and we’ve had a rough few months k Like everyone else, but I’m a long-term thinker on this… What I do is I try and find re-entry points because I’m always trying to deploy capital. If I believe the company’s story, I’ll put in more money to fix it,” he said. O’Leary said he recently bought undisclosed shares in Walt Disney, Adobe and DocuSign, he admitted. that stocks have fallen “a lot” but is adamant that they will rise again at some point.He is also careful about managing risk in his portfolio. His golden rule? “Never more than 20% in any sector and never more than 5% in any stock,” he said, describing it as a strategy. strategy worked for him “for decades.”