He's been racing full-time in either the Xfinity Series or the Cup Series since 1997.
2004 turned out to be Sadler's best year at NASCAR's top level.
Elliott Sadler, 43, made the same announcement Wednesday.
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Currently, all publicly traded companies in the US must file reports with the SEC four times a year, every three months. SEC spokesmen didn't immediately respond to a request for comment.
Citing the toll the "grueling schedule" has taken, Kahne said he plans to spend more time with his son, Tanner, and with his sprint vehicle teams.
The former Hendrick Motorsports driver has 18 victories, including a playoff-clinching win last season at Indianapolis Motor Speedway. Sadler, along with his brother Hermie, have had a lasting impact in motorsports in Virginia from racing go-karts at age seven to his 1995 track championship at South Boston Speedway to competing full-time in the Monster Energy NASCAR Cup Series and NASCAR Xfinity Series (NXS).
That was the only time he finished in the top 10 in the Cup points.
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Kahne says he's "at ease" with his decision because when it comes down to it - "The highs didn't outweigh the lows and the grueling schedule takes a toll on your quality of life". "I need to spend more time doing things I enjoy".
"I've had a great career in racing and met so many fantastic people and fans along the way, some that I'll remain in touch with for life. With that said, we're going to fight as hard as we can no matter what next year looks like - fight as hard as we can throughout the season and try to repeat what we did last year".
"Thanks to everyone that believed in this kid from Enumclaw, Washington". I think in another week or two I'll have a better answer for you. That win came amid speculation that Hendrick would part ways with Kahne following six seasons, and Hendrick made it official two weeks later.
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His best points finish was in 2012, when he was fourth in the standings. A total of 20 races in the Camping World Truck Series rounds out his experience in each rung of NASCAR's three nationwide leagues.