Dear Pankaj,
To give u idea abt. share trading vis a vis the co. records:
A. Physical Shares : 1. All the sharees floated by the co. are earmarked by the Distinctive Numbers (DNR). ie. if the co. has 50 Lac shares it has DNR of 1 to 500000.
2. Each individual holers gets shares allotted against the DNR. i.e u could be holding 100 shares under DNR 101-200 and I hodling DNR 111001-111100.
3. Each holders is issued a certificate with details of name / no. of shares / DNR etc.
4. The ROM - Register of members is kept and updated whenever transfer take place.
B. Electronic or demat holding:
1. Your holding of 100 shares stated above if to be demated then u need to approach a DP- open an account and demat your shares. The co. would transfer your physical shares in favour of the Depository and in turn it will credit those shares into your demat a/c. displayed in your demat statmt.
2. In co.s book the shares will stand in Depost. name agaisnt those same DNR and certificate will be systematically shredded .
C. Share trading: 1. In spot market, traded electronically, there has to be equal no. of purchases matching the sales. i.e. for every share purchased equal no. of shares are sold.
2. T+2 settlement: All the trasactions that takes place today 7/10/11 will be settled on 11/10/11 i.e. Transaction + 2 working days. On which day the purchser's pays in the sellers delivers. practically, the investors a/c are debited on the day of transaction to facilitate the broker to pay on the day of settlment. the shares get credited with the deposirtory and in turn in to your a/c at closing hrs. of thar date.
3. what happens if you dont pay for purchse or do not have credit of your shares sold.
for non payt. against purchse - the broker will keep delivery into his account untill it is settled.
for non delivery of shares sold- there is a system called "auction of shares", wherein your shares will be auctioned on the platform of the exchange and profit / loss will be settlled thru your a/c. with broker.
4. Derivatives - Future and options: These are not traded in spot but are traded now for future. i.e. the buyer buys now assuming the price of the particular share would go up in future and the seller does exactly the other way. each shares has different trade lot and margin amount. one can trade by pauing certain margin amount insteas the full amount , applicable in the spot market.
The co. is not at all connected with the daily transaction of its shares at the exchanges. the depositories provide the beneficiary position to the co. - once a week. this carries the details of the invesors holding the shares of the co. at the closing hrs.of the preceeding working day.
The co. relies on this data for all purposes including the corporate actions like payt. of dividend etc.
I tried to cover all the areas, in brief. should u need more info. pl feel free to ask.