But this heavy focus on just a few stocks has led one portfolio manager to urge investors to diversify, naming two stocks he thinks look particularly attractive. Dunn, who also holds the title of co-head of value equity at Morgan Stanley, said other stocks offered investors "a lot of opportunity," naming two he likes. Thermo Fisher Scientific Healthcare services and biotechnology company Thermo Fisher is another favorite for Dunn, who sees it as an industry leader and "supermarket of tools and analytics." "We think [Thermo Fisher is] really ready to sort of benefit from this as the year progresses." Shares in Thermo Fisher are up around 9.5% year-to-date and 12.8% in the last 12 months.

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Persons: Nvidia, Aaron Dunn, CNBC's, Dunn, Morgan Stanley, They've, BJ's Organizations: Big Tech, Apple, Meta, Microsoft, Tesla, Morgan, Value, Costco Wholesale, Walmart, Sam's, Fisher Scientific Healthcare, . Value Locations: Morgan Stanley's, U.S, Fisher