business from its solar-wafer and solar-energy business. SunEdison Semiconductor, Ltd. spun off in an IPO on the NASDAQ under the ticker "SEMI", with SunEdison, Inc. maintaining a majority stake as the largest shareholder. The IPO generated $94million, used to fund the company's growth. In July 2014, SunEdison created a yieldco subsidiary, called TerraForm Power, Inc., with SunEdison, Inc. maintaining a majority stake as the largest shareholder. TerraForm began publicly trading in an IPO under the ticker "TERP". This IPO of the power-generation subsidiary spin-off raised roughly $500million. SunEdison launched a second yieldco subsidiary, TerraForm Global, in 2015, to manage renewable-energy projects in emerging markets like Brazil, China, and India. This second yieldco trades on the NASDAQ under the ticker "GLBL". In October 2014 SunEdison announced the development of "zero white space" solar modules, which eliminate wasted space on the solar module surface. That month it also announced the implementation of "high-pressure fluidized bed reactor" (HP-FBR) technology, producing high-purity polysilicon up to 10 times more efficiently and with 90% less energy used than non-FBR technologies. In November 2014, with its subsidiary TerraForm Power, SunEdison purchased First Wind, one of the largest wind power developers in the United States, for $2.4billion. The acquisition added wind energy to SunEdison's capacity, and made it the leading renewable energy development company in the world. In 2015, MIT Technology Review named SunEdison #6, and the top energy company, in its annual "50 Smartest Companies" list. The review characterized SunEdison as "Aggressively expanding its renewable energy products and building a business to provide electricity to the developing world." In June 2015, SunEdison, Inc. announced its full divestiture from its semiconductor business, the publicly traded company SunEdison Semiconductor. SunEdison Semiconductors was acquired by GlobalWafers Co., Ltd on December 2, 2016 and subsequently had its name changed back to MEMC LLC. The completion of the sell-off finalized SunEdison's transition into a dedicated renewable-energy company. Bankruptcy Following years of major expansion and the announcement of the intent – which eventually fell through – to acquire the residential-rooftop solar company Vivint Solar in 2015, SunEdison's stock plummeted and its more than $11billion in debt caused it to face bankruptcy in April 2016. It filed for Chapter 11 bankruptcy protection on April 21, 2016. To continue its operations and pay staff, the company received $300 million in bankruptcy debt financing. It continued operations during bankruptcy. The debt financing money came from first-lien