Oprah just made a big bet on Weight Watchers

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Oprah Winfrey Buys Weight Watchers Shares for $43.2m, About 10%

Oprah Winfrey just made a big bet on Weight Watchers.

In a press release on Monday, the weight-loss assistance company said she joined its board and purchased newly issued stock representing a 10% stake of shares outstanding. She also bought options to acquire an additional 5% of fully diluted shares.

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According to the release, Oprah became an adviser, as well as a regular member of the program who will "candidly share her experiences and perspective along the way".

See photos of Oprah from her early days:

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Oprah just made a big bet on Weight Watchers
Daytime talk show hostess Oprah Winfrey gestures to the crowd at the Southwestern High School in Baltimore on Nov. 29, 1988, for quiet during the taping of her show on school violence. (AP Photo/Jason Lee)
Oprah Winfrey, 1970s. (Photo by Film Favorites/Getty Images)
A portrait of Oprah Winfrey upon becoming co anchor of Eyewitness News on WJZ, with co host Jerry Turner, Baltimore, Maryland, June 26, 1978. (Photo by Afro American Newspapers/Gado/Getty Images)
Oprah Winfrey (Photo by DMIPhoto/FilmMagic)
Oprah Winfrey (Photo by SGranitz/WireImage)
Oprah Winfrey (Photo by Ron Galella/WireImage)
Oprah Winfrey (Photo by Jim Smeal/WireImage)
Oprah Winfrey (Photo by James Devaney/WireImage)
Oprah Winfrey (Photo by Dimitrios Kambouris/WireImage)
Oprah Winfrey (Photo by SGranitz/WireImage)
THE TONIGHT SHOW STARRING JOHNNY CARSON -- Pictured: (l-r) Talk show host Oprah Winfrey during an interview with guest host Joan Rivers on January 27, 1986 -- (Photo by: Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)
Stedman Graham and Oprah Winfrey (Photo by Ron Galella/WireImage)
Talk show host Oprah Winfrey holds her Daytime Emmy for Outstanding Talk or Service Show Host, awarded for the Oprah Winfrey Show, 1987. (Photo by Afro American Newspapers/Gado/Getty Images)
FILE - In this May 22, 1990 file photo, Comedian Bob Hope laughs with television talk show host Oprah Winfrey during the taping of the Oprah Winfrey Show in Chicago. (AP Photo/Charles Bennett, File)
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"Weight Watchers has given me the tools to begin to make the lasting shift that I and so many of us who are struggling with weight have longed for" she said in the statement. "I believe in the program so much I decided to invest in the company and partner in its evolution."

Weight Watchers shares surged by as much as 38% in premarket trading.

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The stock is down 72% year-to-date and over the past year.

The company has struggled to lift sales and increase its membership. A Duke University study found earlier this year that the company faced strong competition from rivals. And, Credit Suisse analysts said free weight-loss apps were a better deal for some consumers than Weight Watchers membership.

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Oprah just made a big bet on Weight Watchers

John Goodman - 1991

Cheerful John Goodman in a scene from the film 'Barton Fink', 1991. (Photo by 20th Century-Fox/Getty Images)

John Goodman - 2015

John Goodman attends the 'Trumbo' Accenture Gala during the BFI London Film Festival at Odeon Leicester Square on October 8, 2015 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

Khloe Kardashian - 2007

Khloe Kardashian at the 'Keeping Up With The Kardashians' premiere party on October 9, 2007 in West Hollywood, California. (Photo by Jeff Vespa/WireImage) 

Khloe Kardashian - 2015

Khloe Kardashian appears At ULTA Beauty's West Hills Store To Promote Kardashian Beauty Hair Care And Styling Line at ULTA Beauty on April 2, 2015 in West Hills, California. (Photo by Frazer Harrison/Getty Images)

Jennifer Hudson - 2010

Jennifer Hudson during 'A Fine Romance' Gala Benefiting the Motion Picture and Television Fund - Arrivals at Sunset Gower Studios in Hollywood, California, United States. (Photo by Jon Kopaloff/FilmMagic)

Jennifer Hudson - 2015

SingerJennifer Hudson attends the Marchesa fashion show during Spring 2016 New York Fashion Week at St. Regis Hotel on September 16, 2015 in New York City. (Photo by Gary Gershoff/WireImage)

Jonah Hill - 2006

Jonah Hill during Universal Pictures Presents the World Premiere of 'Miami Vice' at Mann Village Theater in Westwood, California, United States. (Photo by E. Charbonneau/WireImage)

Jonah Hill - 2012

Actor Jonah Hill attends the premiere of 'The Watch' at Grauman's Chinese Theatre on July 23, 2012 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)

Kelly Osbourne - 2002

Kelly Osbourne, daughter of rocker Ozzy Osbourne at St Martin's Lane Hotel, London, August 21, 2002. Kelly, along with brother Jack, mother Sharon and father Ozzy, are the stars of their own reality television show, 'The Osbournes'. (Photo by Gareth Davies/Getty Images)

Kelly Osbourne - 2015

Special guest Kelly Osbourne celebrates the opening of the new Cost Plus World Market Chelsea, New York store on August 18, 2015 in New York City. (Photo by Jamie McCarthy/Getty Images for World Market)

Chaz Bono - 2010

Chaz Bono arrives at the 21st Annual GLAAD Media Awards held at Hyatt Regency Century Plaza on April 17, 2010 in Century City, California. (Photo by Angela Weiss/Getty Images)

Chaz Bono - 2015

Chaz Bono visit 'Extra' at Universal Studios Hollywood on July 28, 2015 in Universal City, California. (Photo by Noel Vasquez/Getty Images)

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