Will that still happen if you put in a single order to buy 51% of all the shares at a price a little above the current market value ?
That trade will be complete before the market "sees" you are trying to buy a ton.
There is no set price to buy shares. If you just want to buy 100 shares at the current ask, it'll probably go through (but even that is no guarantee), but the next 100 shares might well not be available at that price anymore.
That's not how the market works. There are not enough open sell orders at any price (let alone a little above most recent price) for someone to sweep in and buy 51% (or even just a few percent) at once.
As soon as more than a trivial (in the noise) amount of your buys goes through all the open sell orders will start to move up in price (since it's nearly all automated), so you'll be chasing that ever-increasing price a long way up.
For small-time consumers who are buying a few shares here and there - it will appear like there is always some available, but when you are talking about a majority share of the company there isn't that availability sitting there waiting to be just taken.
Also companies have an obligation to report once they have accumulated a certain percentage of a company.
They'll charge a handsome fee, but they could probably get it done.
> Bid [500 x $64.39], [$64.42 x 100] Ask <
It means that someone currently offers to buy 500 shares at the price of $64.39.
It means that someone currently offers to sell 100 shares at the price of $64.42.
In practice, it means that you can buy 100 shares at the price of $64.42, then, after, it will move to the next price level.
=> You can see the "depth" of offers, it's called Level 2 book:
Ask offers:
$64.42 x 100
$64.43 x 200
$64.46 x 100
$65.00 x 600
$97.00 x 100
$999.99 x 100
=> If you try to buy 400 shares, it will cost you:
100 shares x $64.42 = $6 442
200 shares x $64.43 = $12 886
100 shares x $64.46 = $6,446
Divided by 400 shares.
It means ~$64.435 per share, though you saw $64.42 as price.
If you send very large volumes, you quickly eat these price levels.
In our example, if you try to buy 2000 shares, you will get only 1200 shares.
You will have paid an average price of $145.39 per share.
So, yes it may not go through because, it is possible that there are not enough people interested to sell their share (that there is not enough depth, or not at an acceptable price).
And also, the SEC has certain rules (uptick rules, etc) that makes the stock to be frozen in case the price varies too much.
When we are talking about a massive % of the total share count there simply isn't that many "sell" requests out there for you to take advantage of.