IteractiveBrokers (IB) now supports fractional shares

Hello everyone, in case someone missed this, IB now supports fractional shares for securities!

What products can I trade in fractions?
U.S. stocks listed on NYSE, AMEX, NASDAQ, ARCA, or BATS

I believe this should work for ETFs also, if I am not mistaken (I am yet to try this). Personally I am excited as this will simplify my calculations for my buy-ins and I will consider setting up automated investing.

What do you think about this feature? Will you consider buying fractional shares?


Nice, I’ll try it on Tuesday.

Are you too poor to buy a whole share?


Lol I think it’s more about using all the money that you got on IBKR.


And it’s much simpler to rebalance, no need to fiddle as much with spreadsheets.

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Rebalancing should take into account relative price developments between the funds to push portfolio towards your desired allocation so I don’t see how fractional shares helps avoid “fiddling with spreadsheet”. Both price development and buying integer shares will cause your portfolio to deviate from target, you must correct it periodically either way.

I don’t know abotu you but to me 100-200 fr (cost of a typical share) is less than a rounding error and i don’t care if it’s kept as cash at a broker or my wallet or as fractional share

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Also, it might create potential headaches further down the line, when doing the tax return.

I have had to sell fractional shares manually at other brokers, have seen them settling on another date (than the “integer part”), the numbers might fail to add up exactly on a tax return or personal finance application, etc. Not really worth the potential hassle for me for a larger ETF position in my portfolio, if it’s just a few dozens of USD/CHF.


At least the ZH tax software supports fractional shares, but yeah, there’s point to keeping it simple

I find it a bit easier to e.g. buy 9420 USD worth of shares, instead of 121 shares (translation is currently done by my spreadsheet, it’s just I can avoid an extra USD → shares conversion when using fractional shares).

For Berkshire Hathway class A may be?

That’s why they offer class B now. Only ~ 200 bucks.

+/- $9420/121 = $77 deviation from your desired target allocation is pretty much a negligible rounding error and doesn’t matter. Unless maybe you have low 3-4 figures portfolio or so

If you’re trying to roll-your-own-hedge-fund buying dozens-hundreds of different shares, then it can be worth something to think about it. But if you’re just buying VT or a few other broad index funds, it simply DOESN’T MATTER!

I guess we agree :slight_smile:, the fractional part doesn’t matter for the allocation. I just like the simplicity of not having to care about shares/share price, that’s all (you can have a USD denominated order instead of number of shares).

(of course IB will convert behind the scenes, but I don’t care :))

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