These longtime market-beaters still have plenty of fuel in the growth engine.

When a company's shares go on a run, it's reasonable to wonder whether they are still worth investing in. That's a question we can ask about Microsoft ( MSFT 0.56% ) and Shopify ( SHOP 3.98% ) , two tech leaders that have been on a tear this year. The former is up 20% since January, while the latter has climbed 27%. Is there any upside left?

In my view, the answer is a resounding yes. Not only can both companies still deliver superior returns, but they also have many of the qualities required of "forever stocks." Let's dig in.

1. Microsoft

Microsoft is firing on all cylinders. The company's revenue in the fourth quarter of its fiscal year 2025, which ended on June 30, increased 18% year over y

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