Equinix (EQIX, news, chart, volatility), a Foster City, CA telecom services company, saw increasing options activity Thursday. 4,279 puts and 416 calls traded, or about 4 times the average daily. Shares gave up early gains to close down 2.2 percent to $56.16. Feb and March 55 and 50 puts saw increasing open interest. Top trades include a March 55/50 puts spread 1500X for $1.90. Looked buyer initiated.