Company: HJ Heinz Company

(Reuters) - Activist investor Nelson Peltz said his Trian Fund Management has picked up a stake of more than 7 percent in Ingersoll Rand Plc <IR.N> to push changes at the manufacturer of air conditioners and security systems.

Activist investor Nelson Peltz said his Trian Fund Management has picked up a more than 7 percent stake in industrial conglomerate Ingersoll Rand, lifting Ingersoll shares.

As manufacturing prices rise, grocery suppliers find it harder to offer consistently low prices, now demanded by their biggest customer: Wal-Mart Stores. 

Stocks closed mixed in thin trading Friday ahead of the three-day holiday weekend, but all major averages logged robust gains for the week following some positive economic news and amid optimism that Greece will soon find a solution to its debt crisis.

CNBC.com ranks the 10 richest people who have sought the U.S. presidency since 1992. Some of the people who made the list might surprise you, but what’s more surprising is who didn’t make it. Click ahead to see the 10 richest people who ran for president in the last 20 years.

Stocks finished mixed in another thin, choppy session Friday, as investors were reluctant to commit to the market ahead of the weekend and amid ongoing nervousness over the debt talks in Europe and Washington.