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Ed-tech companies serving higher education in 2015 attracted investments totaling $658.3 million, according to a white paper released this week by market research firm Ambient Insight. Higher education is a small piece of the total dollars poured into educational technology, however. Ambient Insight estimates the sector attracted $6.54 billion last year, a dramatic increase from $2.42 billion in 2014.

The white paper identifies a number of reasons behind the increase: more funding going to companies based in China, a growing interest in consumer-facing companies and a greater number of investments at $50 million or more. The single largest funding amount last year went to online program management service provider HotChalk, which in November sold a $230 million minority stake to the media corporation Bertelsmann SE & Co. KGaA.