He 'placed/put a lot of stock' in her ability to get the job done. [=he had a lot of trust in her ability to get the job done]
The mayor's 'stock' with voters is high/low right now. [=the mayor is popular/unpopular with voters right now]
He decided to 'exercise his stock options'. [=he decided to buy stock in the company that he works for]
(..) truly believe that such objects exist. Do you? Do you believe they exist, sir? Well... I see no reason to put stock into an old wives' tale. You're lying! You know one exists. You told him about it. You told him about the Elder Wand... and where he could go looking for it. (..)2011 Harry Potter and the Deathly Hallows: Part 2