Y! Finance site numbers for me have been unstable and flaky all day, and their after-close market numbers are screwed up for about five dozen items in my watch lists.

page refresh, etc. doesn't adjust, so they must have bad data commits somewhere.

not wildly off, just a few pennies here and there, along with inversion (closing down 3-4 cents instead of up a dime) and bad primaries (e.g. open price correct but day high/low not).

this is compared to vantagewire and cross-referenced against GOOG (which match each other).

no distinct pattern that I can see ... but if they Y! doesn't clean things up, be careful across the markets tomorrow, since a lot of HFT algorithms have some parameters based on HLOC (to calculate S/R).

not to mention the ton of mobile apps (iOS, Android, etc.) and other sites using the free delayed data; for any of them that go with the same market feed as Y! does, they'll be all over the place, but almost imperceptibly. If it continues, you'd have to have a keen eye to catch it.

FI's, brokers, dealers, pro traders and the like of course get multiple feeds direct from the exchanges ... so this could be a case of Joe Retail getting screwed with (again).

Tread/trade carefully.

GLTA,

R.