all the public companies are listed,after the ipo

There are 50 companies listed in Nifty and 30 companies in 
SENSEX.Some of the companies are ACC, Bajaj Auto, SBI, 
ICICI, Infosys etc.

Top 30 Companies listed in BSE on the base of turnover.
Top 50 Companies listed in NSE on the base of turnover.

don't giv fuckoff answers like bse consist of 30 top 
companies and nse 50,i want to know how would one knows 
that this company is under nifty or bse

I also have same question. What I would like to have is 
list of 30 SENSEX and 50 NIFTY companies as of today.

icici bank, reliance industries, ntpc, power grid, reliance
communication, jp associates,tcs, tata steel,

the company,which is performance is better in all of the 
index and growth and turn over is high.second is that 
company is listed,after the ipo.

stocks under nifty 
ABB Ltd.,ELECTRICAL EQUIPMENT,ABB,EQ,INE117A01022
ACC Ltd.,CEMENT AND CEMENT PRODUCTS,ACC,EQ,INE012A01025
Ambuja Cements Ltd.,CEMENT AND CEMENT
PRODUCTS,AMBUJACEM,EQ,INE079A01024
Axis Bank Ltd.,BANKS,AXISBANK,EQ,INE238A01026
Bharat Heavy Electricals Ltd.,ELECTRICAL
EQUIPMENT,BHEL,EQ,INE257A01018
Bharat Petroleum Corporation
Ltd.,REFINERIES,BPCL,EQ,INE029A01011
Bharti Airtel Ltd.,TELECOMMUNICATION -
SERVICES,BHARTIARTL,EQ,INE397D01016
Cairn India Ltd.,OIL
EXPLORATION/PRODUCTION,CAIRN,EQ,INE910H01017
Cipla Ltd.,PHARMACEUTICALS,CIPLA,EQ,INE059A01026
DLF Ltd.,CONSTRUCTION,DLF,EQ,INE271C01023
GAIL (India) Ltd.,GAS,GAIL,EQ,INE129A01019
Grasim Industries Ltd.,CEMENT AND CEMENT
PRODUCTS,GRASIM,EQ,INE047A01013
HCL Technologies Ltd.,COMPUTERS -
SOFTWARE,HCLTECH,EQ,INE860A01027
HDFC Bank Ltd.,BANKS,HDFCBANK,EQ,INE040A01018
Hero Honda Motors Ltd.,AUTOMOBILES - 2 AND 3
WHEELERS,HEROHONDA,EQ,INE158A01026
Hindalco Industries Ltd.,ALUMINIUM,HINDALCO,EQ,INE038A01020
Hindustan Unilever Ltd.,DIVERSIFIED,HINDUNILVR,EQ,INE030A01027
Housing Development Finance Corporation Ltd.,FINANCE -
HOUSING,HDFC,EQ,INE001A01028
I T C Ltd.,CIGARETTES,ITC,EQ,INE154A01025
ICICI Bank Ltd.,BANKS,ICICIBANK,EQ,INE090A01013
Idea Cellular Ltd.,TELECOMMUNICATION -
SERVICES,IDEA,EQ,INE669E01016
Infosys Technologies Ltd.,COMPUTERS -
SOFTWARE,INFOSYSTCH,EQ,INE009A01021
Larsen & Toubro Ltd.,ENGINEERING,LT,EQ,INE018A01030
Mahindra & Mahindra Ltd.,AUTOMOBILES - 4
WHEELERS,M&M,EQ,INE101A01018
Maruti Suzuki India Ltd.,AUTOMOBILES - 4
WHEELERS,MARUTI,EQ,INE585B01010
NTPC Ltd.,POWER,NTPC,EQ,INE733E01010
National Aluminium Co. Ltd.,ALUMINIUM,NATIONALUM,EQ,INE139A01026
Oil & Natural Gas Corporation Ltd.,OIL
EXPLORATION/PRODUCTION,ONGC,EQ,INE213A01011
Power Grid Corporation of India
Ltd.,POWER,POWERGRID,EQ,INE752E01010
Punjab National Bank,BANKS,PNB,EQ,INE160A01014
Ranbaxy Laboratories
Ltd.,PHARMACEUTICALS,RANBAXY,EQ,INE015A01028
Reliance Capital Ltd.,FINANCE,RELCAPITAL,EQ,INE013A01015
Reliance Communications Ltd.,TELECOMMUNICATION -
SERVICES,RCOM,EQ,INE330H01018
Reliance Industries Ltd.,REFINERIES,RELIANCE,EQ,INE002A01018
Reliance Infrastructure Ltd.,POWER,RELINFRA,EQ,INE036A01016
Reliance Petroleum Ltd.,REFINERIES,RPL,EQ,INE475H01011
Reliance Power Ltd.,POWER,RPOWER,EQ,INE614G01033
Siemens Ltd.,ELECTRICAL EQUIPMENT,SIEMENS,EQ,INE003A01024
State Bank of India,BANKS,SBIN,EQ,INE062A01012
Steel Authority of India Ltd.,STEEL AND STEEL
PRODUCTS,SAIL,EQ,INE114A01011
Sterlite Industries (India) Ltd.,METALS,STER,EQ,INE268A01031
Sun Pharmaceutical Industries
Ltd.,PHARMACEUTICALS,SUNPHARMA,EQ,INE044A01028
Suzlon Energy Ltd.,ELECTRICAL EQUIPMENT,SUZLON,EQ,INE040H01021
Tata Communications Ltd.,TELECOMMUNICATION -
SERVICES,TATACOMM,EQ,INE151A01013
Tata Consultancy Services Ltd.,COMPUTERS -
SOFTWARE,TCS,EQ,INE467B01029
Tata Motors Ltd.,AUTOMOBILES - 4
WHEELERS,TATAMOTORS,EQ,INE155A01014
Tata Power Co. Ltd.,POWER,TATAPOWER,EQ,INE245A01013
Tata Steel Ltd.,STEEL AND STEEL
PRODUCTS,TATASTEEL,EQ,INE081A01012
Unitech Ltd.,CONSTRUCTION,UNITECH,EQ,INE694A01020
Wipro Ltd.,COMPUTERS - SOFTWARE,WIPRO,EQ,INE075A01022

NYSE Nifty Fifty constituents:-

American Express 
American Home Products 
AMP Inc. 
Anheuser-Busch 
Avon Products 
Baxter International 
Black & Decker 
Bristol-Myers 
Burroughs Corporation 
American Hospital Supply Corp. 
Chesebrough-Ponds 
The Coca-Cola Company 
Digital Equipment Corporation 
Dow Chemical 
Eastman Kodak 
Eli Lilly and Company 
Emery Air Freight 
First National City Bank 
General Electric 
Gillette 
Halliburton 
Heublein Brewing Company 
IBM 
International Flavors and Fragrances 
International Telephone and Telegraph 
J.C. Penney 
Johnson & Johnson 
Louisiana Land and Exploration 
Lubrizol 
Minnesota Mining and Manufacturing (3M) 
McDonald's 
Merck & Co. 
MGIC Investment Corporation 
PepsiCo 
Pfizer 
Philip Morris Cos. 
Polaroid 
Procter & Gamble 
Revlon 
Schering Plough 
Joe Schlitz Brewing 
Schlumberger 
Sears, Roebuck and Company 
Simplicity Patterns 
Squibb 
S.S. Kresge 
Texas Instruments 
Upjohn 
The Walt Disney Company 
Xerox

Well everybody now knows that there are 30 companies listed 
on the Sensex and 50 on the NIFTY. They are listed based on 
the Market cap.

Now what does Market cap means.
Market cap = numbers of shares * last price traded

This makes Reliance industries the heaviest script on the 
index. It has close to 10% weightage on the indexes.

The market cap for Reliance industries is Rs.295,088 crore

As the value of shares increases and decreases the 
companies move in and out of the index. 

example Satyam - The day Raju made the confession the 
script fell from Rs 200 to Rs 20 and the market cap for the 
company was reduced to just 10 % and so that gave way for 
new script Reliance capital (As far as i remember)

I hope it helps