
What is a stock symbol?
A stock symbol is an abbreviated designation for a specific share . When a company goes public, it must choose a stock symbol. This often resembles the company’s name and must be unique to create a distinguishing value. Depending on who you talk to, other terms may be used to indicate this. For example, one person may speak of a stock symbol, while another may refer to a ticker or a trading symbol . These terms all mean the same thing.
Stock symbols were once introduced simply because it was more convenient. With just a few letters you could now know exactly which listed company someone was talking about. This has led to increased efficiency on the physical trading floor.
Unique Trading Symbols
Another advantage of stock tickers is that they are unique. Names of companies that are very similar are no longer confused. A good example in this context is the companies Citigroup and CIT Group. Because Citigroup has the ticker ‘C’ and CIT Group has ‘CIT’, both companies – and the corresponding shares – are easier to distinguish.
Where tickers were initially applied in a fairly simple manner, people have now become very creative in creating these tickers. For example, the designations of different classes of a share are often incorporated into the ticker. For example, there is a share A and a share B. If you read the letter ‘Q’ behind the ticker, you can deduce from this that a company has now gone bankrupt.
It is important to remember that tickers only need to be unique within a particular stock exchange . It is not uncommon for different companies to use the same ticker, because they are all listed on a different exchange. When you want to make an investment, it is therefore wise to check whether you are dealing with the right share.
Correct notation
Many investors use tickers that are actually incomplete. A complete stock symbol does not only contain the symbol of the stock as such, but also additional information about the stock exchange on which it is traded. For example, if you are talking about a large and established brand such as ( blue chip stocks for example) Apple, then ‘AAPL’ is incomplete and you should actually speak of ‘NASDAQ:AAPL’. The ‘NASDAQ’ part refers to the stock exchange on which Apple is traded and the ‘AAPL’ part is the symbol of the stock itself. Sometimes the ticker does not mention the stock exchange, but the country.
Not every ticker is the same length. In principle, a ticker should contain between 1 and 4 characters. However, this is not a universally applicable rule. For example, with ‘ NASDAQ’ you are already 6 letters further. It is relevant to note that a ticker does not necessarily have to be a short version of the name of a company. A unique and catchy combination of letters, that does not refer to the name of a company, may be chosen.

ISIN code versus ticker
It was previously discussed that stock symbols are widely used by stock traders. It was also discussed that tickers only need to be unique within a particular exchange. This does not have to cause problems for trading within the boundaries of an exchange, but it is different for international trading. Nowadays, many securities are traded internationally. When you come across the same tickers that belong to completely different companies, this can cause confusion. The solution? An ISIN code.
The ISIN code is a longer code than stock symbols that is used to identify securities. You can compare it to a telephone number or an IP address. At the same time, this means that it is of little use to you without knowing which security it concerns. A code does not say much in itself. For example, you do not immediately know who a random telephone number belongs to. The advantage of an ISIN code is that it is truly internationally unique.
Example ISIN vs ticker
To give a concrete example, the company Apple will be used as an example again. Apple’s ticker is NASDAQ:AAPL. The ISIN code does not look like this and is US0378331005. This example clearly shows that a ticker is generally easier to use. However, the ISIN code does have a higher distinguishing value.
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