I heard alot on CNBC about the market makers wanting to get the S&P to close as close too they 1400 mark for expiration last friday (3/16). because of all the puts they sold since 2/27 etc. I understand strike pegging etc. but my question is... Which contract did they sell options on? SPY? SPX, ES? Also, the options on the SPX or ES, are those based on the CME Index or are they based on the futures contract? (If I own a 1400 put on the SPX and on friday the closing price was 1386 for the index and 1399 for ES, am I 1 point or 14 points in the money) Thank you.