Nikkei 225 Index (N225)

The Hindu Business Line  2 hrs ago  Comment 
The broader Topix gained 0.9 per cent to 1,740.78.
The Hindu Business Line  Apr 9  Comment 
24 of broader Topix’s 33 subsectors rise
The Hindu Business Line  Apr 6  Comment 
Japanese stocks were choppy on Friday morning as the perceived safe-haven yen rose after US President Donald Trump warned of further tariffs on Chin
The Economic Times  Apr 5  Comment 
The Nikkei gained 1.5 per cent to 21,645.42, trading above its 200-day moving average of 21,359.22.
The Hindu Business Line  Apr 5  Comment 
Nikkei India Services PMI rises to 50.3 in March from 47.8 in February
The Economic Times  Apr 4  Comment 
The Nikkei added 0.1 per cent to 21,319.55 after traversing positive and negative territory through the session.
The Economic Times  Apr 4  Comment 
Japan's Nikkei added 0.1 per cent in thin volumes, while South Korea eased 0.2 per cent.
The Economic Times  Apr 3  Comment 
The Nikkei ended 0.5 per cent lower, at 21,292.29.
The Economic Times  Apr 2  Comment 
The Nikkei rose 0.6 per cent to 21,572.73 in midmorning trade.
The Economic Times  Mar 30  Comment 
The Nikkei ended 1.4% higher at 21,454.30 points, its highest close in more than a week.


The Nikkei 225 Stock Index maps companies on the Tokyo Stock Exchange (TSE). It is the oldest and the most well known Asian index in the world. The Nihon Keizai Shimbun (Nikkei) newspaper has been commisioned to officially calculate this index since 1971. The Nikkei 225 began to be calculated on September 7, 1950, retroactively calculated back to May 16, 1949. Currently. the Nikkei is used as the major indicator for the Japanese economy, similar to the Dow Jones Industrial Average (.DJIA). In fact, it was known as the "Nikkei Dow Jones Stock Average" from 1975 to 1985.[1]. However, unlike the Dow Jones, as the Nikkei 225 is designed to reflect the overall market, there is no specific weighting of industries. Stock splits, removals and additions of constituents impact upon the effective weighting of individual stocks and the divisor.[2]

Weighting and Components

The Nikkei is a price weighted average index (the unit is Yen), similar to the Dow Jones Index, based on a par value of ¥50 per share. That means, a ¥50 price change in any stock affects the average the same way, regardless of whether the stock is priced at ¥5 or ¥500 per share. The Nikkei 225 index's components are reviewed every year in September. Any changes, if required, are published in October and the index is adapted accordingly.

To calculate an equal weighted index, the market capitalization for each stock used in the calculation of the index is redefined so that each index constituent has an equal weight in the index at each re-balancing date. In addition to being the product of the stock price, the stock’s shares outstanding, and the stock’s float factor – and the exchange rate when applicable; a new adjustment factor is also introduced in the market capitalization calculation to establish equal weighting.

  • Stock Market Value= Price of shares * Number of shares outstanding * Free float factor * Exchange Rate(if applicable) * Adjustment Factor[3]

The Adjustment factor of a stock is assigned to the stock at each re-balancing date, which makes the stock value for each stock equal. For index component, the value would be:

  • Adjustment Factor= Index specific constant "Z"/(Number of shares of the stock*Adjusted stock market value before re-balancing)

The main criticism with this index is that a $5 priced share would have the same weight as the $200 priced share, which gives the smaller shares more weight than their due. Moreover, the stocks keep changing and so does the equality, so the stock has to be rebalanced from time to time[4] as compared to a cap weighted index.


  2. Wikipedia
  3. Calculating Equal weighted index
  4. Definition of a Equal Weighted Index
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