Hi Donald,
I found out that the SEBI data is based on previous days transactions. The custodians submit the FII transaction data of 13 Oct to SEBI a day later on the 14th, but SEBI for some strange reason tags the data as of the day of submission.
So effectively what you see as 14th Oct data is for 13th Oct. This explains the 500 points rise on 13th -as FIIS bought net Rs. 3100 crores that day (not 700 Cr which pertained to Oct 12th). Teh equitymaster table below makes it clear.
| Daily FII buy/sell | |||
|---|---|---|---|
| DAY ENDED | GROSS PURCHASES | GROSS SALES | NET INV. |
| (Rs m) | (Rs m) | (Rs m) | |
| 1-Oct-10 | 45,644 | 26,003 | 19,641 |
| 4-Oct-10 | 47,502 | 28,313 | 19,189 |
| 5-Oct-10 | 43,602 | 33,900 | 9,702 |
| 6-Oct-10 | 52,358 | 29,504 | 22,854 |
| 7-Oct-10 | 50,982 | 33,974 | 17,008 |
| 8-Oct-10 | 36,028 | 27,953 | 8,075 |
| 11-Oct-10 | 35,454 | 24,342 | 11,112 |
| 12-Oct-10 | 30,925 | 23,924 | 7,001 |
| 13-Oct-10 | 67,186 | 36,182 | 31,004 |
| 14-Oct-10 | 54,921 | 25,977 | 28,944 |
| 15-Oct-10 | 29,220 | 22,680 | 6,540 |