Not all investments are winners, but when it comes to money placed in shares of Long Island-based companies, some stocks offer better returns than others.

We've taken a look at Long Island opening stock prices on May 5, 2014, and compared those to where prices were trading at the opening bell on May 5, 2015.

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This list was compiled using a chart of local stocks that run in Newsday's business section. Prices were obtained via Yahoo Finance.

See alsoStocks that have performed

Here's a look at the companies that delivered the best return on investments, and how much the return on a $1,000 investment would be.

In other words, had you invested $1,000 a year ago, what would it be worth today?

Mobile readers, click on the link after the third paragraph to see the entire list.