Say I own some shares in a company and their stock rises and I want to buy more shares does my older price change to the new one? And if I sell just the amount I bought the 2nd time what happens? I would love it if you could explain it with an example. Thanks in advance

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    I'm not sure what you mean... are you asking if you'd have to pay more money for your old shares if you wanted to buy more?
    – glibdud
    Commented Nov 18, 2020 at 17:35
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    What do you mean "your price"? Commented Nov 18, 2020 at 18:10
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    "If I buy a TV and then the price goes up and I want to buy another TV does my older price change to the new one? And if I sell just the second TV what happens?" Commented Nov 18, 2020 at 18:10
  • @Brosky There's two relevant prices for shares you own, the cost basis and the current value. Which do you mean when you say the "older price"? (Current value is unaffected by buying, it's just whatever the market says. Cost basis for tax purposes could be affected depending on where you are. For example, Canada uses average cost as cost basis when selling stocks so you could say buying new shares "changes" the cost basis for older shares - it doesn't really, but it kinda looks like it does from a tax perspective.)
    – JBGreen
    Commented Nov 18, 2020 at 18:11
  • @user253751 I meant the price of shares I already owned
    – Brosky
    Commented Nov 20, 2020 at 16:44

3 Answers 3


I would love it if you could explain it with an example.

Say you go to the store and buy 10 apples for $1 each. You then go to the store the next day and the price has risen to $2. How much would you expect to pay for 10 more apples?

Obviously you'd pay $2 each. What you paid for apples yesterday is irrelevant.

Now suppose you buy the 10 extra apples, and and want to sell 10 for $2 (we're ignoring bid/ask spreads in this example). So you sell 10 apples for $2 each. You have 10 apples that you spent a net $10 for (the $30 you spent less the $20 you got for selling the 10). It doesn't really matter (at this point) which 10 apples you sold, except possibly for tax purposes, which I don't think you're asking about.


Just because you buy shares does not "lock in" the price. The shares are worth whatever the market currently values them at. A stock "rising in price" intrinsically means that it now costs more to purchase, unless I'm misunderstanding your question...

Say you buy two shares at $100 each. Your position is currently worth $200. The stock price then rises to $120. You now own two shares, priced at $120 each, for a total of $240. If you buy one more share at this new price, you own three shares, each worth $120, for a total of $360. Note that in this example your position is worth $360, but you only paid $100 x 2 + $120 = $320.


Keeping it simple, buying stock (shares) is a risk. The value of the stock you are holding will most likely change after buying them. If you want to buy more shares at a later date and the price has changed, either up or down, you buy at that new price, no matter what the 'original' price was. So if you sell the same number of shares and the value has gone down you receive less than what you paid originally (you have lost some money). Conversely, if the value has gone up you receive more than what you originally paid (you have made some money).

  • Let's say I own 100 shares and buy 100 more at different prices. So I have 200 and if now decided that I want to sell just 100 shares which shares will be sold(the latest I bought..?)?
    – Brosky
    Commented Nov 20, 2020 at 16:47
  • You will need to pick a methodology and be consistent about it for tax purposes. Either First in First out (FIFO) or (LIFO). Aside from taxes and accounting rules it is irrelevant, a stock is a stock.
    – JohnFx
    Commented Nov 21, 2020 at 13:50

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