A Sayville student who voluntarily participated in an online stock market game proved his skills in a big way by placing first in the state.

Matthew Laskowitz, a junior at Sayville High School, had the highest-grossing portfolio among more than 3,900 students statewide in The Stock Market Game, a mock investment program in which teams invest a fictional $100,000 over a 10-week span. The program is coordinated by the SIFMA Foundation.

Laskowitz participated in the program last year as part of a business and investment class, then inquired with teacher Chad Cross if he could register again this year.

The teen's portfolio was valued at $120,699.27 after the 10 weeks, compared with only about $100 last year, he said.

"I took more risks this year," Laskowitz, 17, said of his strategy. "It ended up working out."

Laskowitz's investments ranged from Apple to Tesla Motors to Plug Power, a provider of alternative energy technology. His portfolio at one point was more than $138,000, he said.

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"He played on his own time, did his own research, and met with me when he needed advice," Cross said. "Matt was doing so well, I would advise him to make his own decisions with regard to investments."

Laskowitz also is a member of the high school's golf team.