Looks like an investor is accumulating Cadence Design Systems (CDNS, news, chart, volatility) May 2.5 calls today. 10,000 have traded. The top trade is 6,000 at the offer for $1.60. The rest of the day’s trades been in smaller sizes, mostly at the offer for $1.55. 10,000 have traded in all. Shares are down 2 cents to $3.82. Note: similar activity surfaced about two weeks ago, but it was in the May 5 puts. Open interest in that contract is up from 4,498 on Dec 18 to 16,956.