Megacap Stocks: UNH, LLY Shine as WMT Faces Challenges

Megacap stocks are behemoths that set the tone for their industries. Their massive scale typically leads to wide moats, but it also means they have already exploited most of their existing market opportunities and must invest heavily to expand further, a risky proposition.

Two such industry titans with attractive long-term potential are UnitedHealth (UNH) and Eli Lilly (LLY). UnitedHealth has seen annual revenue growth of 10.6% over the last five years, beating most of its peers, and its dominant market position allows it to negotiate pricing and reimbursement rates.

Eli Lilly, on the other hand, has experienced outstanding annual revenue growth of 43.1% over the past two years, reflecting market share gains this cycle. The company's adjusted operating margin improvement of 18.7 percentage points over the last two years demonstrates its ability to scale efficiently, and share buybacks have catapulted its annual earnings per share growth to 31.4%, outperforming revenue gains.

However, Walmart (WMT), another megacap stock, faces headwinds due to its large revenue base making it harder to increase sales quickly, and a gross margin of 25.1% is an output of its commoditized inventory. Its operating margin of 4.3% falls short of the industry average, and the smaller profit dollars make it harder to react to unexpected market developments.