Small investors only have so much say at a company because each individual only owns a tiny fraction of the outstanding stock. But activist investors buy a lot of stock, often amassing multimillion-dollar (or larger) positions so they can get a seat at the decision table.

Right now, relatively small biotech company Azenta (NASDAQ: AZTA) and entertainment giant Disney (NYSE: DIS) are both facing activist calls for change. Here's how to think about such activist activity.

Azenta has a market cap of $2.9 billion, which isn't tiny, but it's hardly a large company in the healthcare sector. The company provides products and services around sample management. Sample management involves the selection, collection, storage, and retrieval of samples (often biological) plus the related data.

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Source Fool.com