Quote from TriPack:
Note that the question being asked is not, "When does the March contract expire", but rather "when do we roll over". Of course you may roll over whenever you choose to do so. But if you wish to always be trading the most liquid contract month, then you will do so on the trading day preceding the 2nd Friday of the expiration month. At least this is the date when the volume and open interest has rolled to the next contract month for at least the last 10+ years in the S&Ps. If you wish to trade an illiquid contract, then by all means be my guest, but advising others to roll over on the 15th is simply misinformation.
MTH/ ---- DAILY ---- PT EST ---- PRIOR DAY ----
STRIKE OPEN HIGH LOW LAST SETT CHGE VOL SETT VOL INT
MAR04 1120.25 1126.50 1104.50 1105.25B 1105.50 -1475 306K 1120.25 930475 595948
JUN04 1119.50 1125.25 1103.25 1104.50 1104.25 -1500 1036K 1119.25 62494 169436
TOTAL EST.VOL VOL OPEN INT.
TOTAL 1342977 992969 765384
e-mini s&p 500 futures
settlement prices as of 03/12/04 07:00 pm (cst)
MTH/ ---- DAILY ---- PT EST ---- PRIOR DAY ----
STRIKE OPEN HIGH LOW LAST SETT CHGE VOL SETT VOL INT
MAR04 1105.75 1120.75 1102.25 1119.00 1119.25 +1375 119K 1105.50 306870 570982
JUN04 1104.50 1119.75 1101.00 1118.50 1118.00 +1375 741K 1104.25 36107 263051
TOTAL EST.VOL VOL OPEN INT.
TOTAL 860693 1342977 834033