BlackRock just upped its stake in 3 US tech giants

BlackRock has upped its stake in some big-name tech companies.

The world's largest asset manager, with assets under management of $4.5 trillion, now has a 5.6% stake in Facebook, a 5.6% stake in HP, and a 5.7% stake in Apple, according to SEC filings published in recent days.

Apple's stock has taken a slide in recent months and is currently trading below $100. HP's stock is trading around $9.50.

Facebook, meanwhile is up from a year ago, and trading around $97, versus $77 last January.

Apple will release fourth-quarter earnings later on Tuesday.

We've reached out to BlackRock for comment.