Question: What company produced the 2015 Best Animated Feature Oscar winning movie?

Context paragraphs:
Annie Award for Best Animated Feature: The Annie Award for Best Animated Feature is an Annie Award introduced in 1992, awarded annually to the best animated feature film.  In 1998 the award was renamed Outstanding Achievement in an Animated Theatrical Feature, only to revert to its original title again in 2001.  Since the inception of Best Animated Feature at the Academy Awards in 2001, the Annie Award winner has matched up every year except for 2006, 2008, 2010, 2012, and 2014.

Chico and Rita: Chico and Rita is a 2010 American-Spanish adult animated music romantic film with Spanish and English languages directed by Tono Errando, Fernando Trueba and Javier Mariscal.  The story of Chico and Rita is set against backdrops of Havana, New York City, Las Vegas, Los Angeles and Paris in the late 1940s and early 1950s.  Chico is a young piano player with big dreams.  Rita is a beautiful singer with an extraordinary voice.  Music and romantic desire unite them, but their journey—in the tradition of the Latin ballad, the bolero—brings heartache and torment.  The film was produced by Fernando Trueba Producciones, Estudio Mariscal, and Magic Light Pictures.  It received financing from CinemaNX and Isle of Man Film.  It won the Goya Award for Best Animated Film at the 25th Goya Awards and was nominated for the Oscar for Best Animated Feature at the 84th Academy Awards (the first nomination for a Spanish full-length animated film).

Chris Williams (director): Chris Williams (born c. 1968/1969) is a Canadian-American film director, screenwriter and animator at Walt Disney Animation Studios.  He directed the short film "Glago's Guest" and co-directed "Bolt", which was nominated for the Oscar for Best Animated Feature in 2009; "Big Hero 6", which won the Oscar for Best Animated Feature in 2015; and "Moana," which was nominated for two Oscars in 2016.

Annie Award for Music in a Feature Production: The Annie Award for Music in a Feature Production (or Annie Award for Music in an Animated Feature Production) is an Annie Award given annually to the best music in an animated feature film, theatrical or direct-to-video.  It began in 1997 as the "Annie Award for Best Individual Achievement: Music in a Feature/Home Video Production".  Throughout the following years, the title was renamed "Outstanding Individual Achievement for Music in an Animated Feature Production", "Outstanding Individual Achievement for Music Score in an Animated Feature Production", and "Outstanding Music in an Animated Feature Production" before changing to its current title in 2005.  It was retitled "Best Music in an Animated Feature Production" in 2006 for three years before being reverted to "Music in an Animated Feature Production" in 2009.

Big Hero 6 (film): Big Hero 6 is a 2014 American 3D computer-animated superhero-comedy film produced by Walt Disney Animation Studios and released by Walt Disney Pictures.  Loosely based on the superhero team of the same name by Marvel Comics, the film is the 54th Disney animated feature film.  Directed by Don Hall and Chris Williams, the film tells the story of Hiro Hamada, a young robotics prodigy who forms a superhero team to combat a masked villain.  The film features the voices of Scott Adsit, Ryan Potter, Daniel Henney, T.J. Miller, Jamie Chung, Damon Wayans, Jr., Genesis Rodriguez, Alan Tudyk, James Cromwell, and Maya Rudolph.

2002 in anime: At the Mainichi Film Awards, "" won the Animation Film Award and "Millennium Actress" won the Ōfuji Noburō Award.  Internationally, "Spirited Away" became the first, and so far only, anime to win both the Academy Award for Best Animated Feature and the Annie Award for Best Animated Feature.  Kōji Yamamura's "Mt. Head" was nominated for the Academy Award for Best Animated Short Film.  "Spirited Away" also won the New York Film Critics Circle Award for Best Animated Film.

Don Hall (filmmaker): Don Hall is an American film director and writer at Walt Disney Animation Studios.  He is known for co-directing "Winnie the Pooh" (2011), "Big Hero 6" (2014), which was inspired by the Marvel Comics of the same name and "Moana" (2016), along with Ron Clements and John Musker.  "Big Hero 6" won the Oscar for Best Animated Feature in 2015.

Chris Buck: Chris Buck (born 1960/1961) is an American film director known for co-directing "Tarzan" (1999), "Surf's Up" (2007) (which was nominated for the 2008 Oscar for Best Animated Feature), and "Frozen" (2013) (which won the Oscar for Best Animated Feature in 2014).  He also worked as a supervising animator on "Home on the Range" (2004) and "Pocahontas" (1995).

2013 in anime: Internationally, "Patema Inverted" and "The Wind Rises" were nominated for the Asia Pacific Screen Award for Best Animated Feature Film.  "The Wind Rises" was also in competition for the Golden Lion at the 70th Venice International Film Festival.  "The Wind Rises" won the New York Film Critics Circle Award for Best Animated Film and was nominated for the Golden Globe Award for Best Foreign Language Film.  "The Wind Rises" and "A Letter to Momo" have been nominated for the Annie Award for Best Animated Feature at the 41st Annie Awards.  "The Wind Rises" has also been nominated for the Academy Award for Best Animated Feature and "Possessions" has been nominated for the Academy Award for Best Animated Short Film at the 86th Academy Awards.

Academy Award for Best Animated Feature: The Academy Awards are given each year by the Academy of Motion Picture Arts and Sciences (AMPAS or the Academy) for the best films and achievements of the previous year.  The Academy Award for Best Animated Feature is given each year for animated films.  An animated feature is defined by the Academy as a film with a running time of more than 40 minutes in which characters' performances are created using a frame-by-frame technique, a significant number of the major characters are animated, and animation figures in no less than 75 percent of the running time.  The Academy Award for Best Animated Feature was first given for films made in 2001.

Supporting paragraphs: Don Hall (filmmaker) Big Hero 6 (film)
Answer: Walt Disney Animation Studios