Stock futures jumped on Thursday as U.K. citizens headed to the polls to vote on the "Brexit" referendum.

S&P 500 futures were up 0.87%, Dow Jones Industrial Average futures climbed 0.86%, and Nasdaq futures added 0.9%.

The latest poll numbers have tipped in favor of a "remain" vote. An Ipsos Mori poll showed 52% voting for the United Kingdom to remain in the European Union with 48% saying they preferred to leave, backing up a ComRes telephone poll and YouGov poll released on Wednesday. The political and economic repercussions for the eurozone could be dire if a "Brexit" came to pass.

The FTSE 100 rocketed to a two-month high on Thursday on the higher likelihood of a "remain" vote. The London-based index rose 1.1%, while Germany's DAX added 1.7% and the CAC 40 in France increased 1.8%. 

The polling stations close at 10 p.m. London time -- 5 p.m. EDT -- with a clear indication of which way the voting is going likely to emerge from about 11 p.m. EDT. More than 46 million people in Great Britain are registered to vote in the referendum. 

The latest read on initial claims for U.S. unemployment benefits fell for the 68th straight week and hit an eight-week low. Jobless claims fell by 18,000 to 259,000 in the week ended June 18. 

Accenture's (ACN - Get Report) third-quarter profit matched expectations while revenue topped Wall Street forecasts. The company expects current-quarter revenue before reimbursements from $8.25 billion to $8.5 billion, compared to expectations of $8.35 billion.

BlackBerry (BBRY) reported a wider loss and another decline in revenue in its first quarter. The smartphone maker posted a net loss of $670 million in the latest three-month period compared to income of $68 million in the year-ago quarter. Adjusted net income was breakeven, better than an expected loss of 9 cents a share. Revenue fell nearly 40%, though came in above estimates. 

Red Hat (RHT) agreed to acquire 3scale, a software-developing management company, for an undisclosed amount. The deal is expected to close this month. For the fiscal year, non-GAAP operating expenses are expected to rise by $5 million, or 3 cents.

Separately, Red Hat earned 50 cents a share in its first quarter, on par with estimates. The open-source software company posted revenue of $567.9 million in the period, topping forecasts.

Barnes & Noble (BKS) rose nearly 5% in premarket trading after issuing a more confident outlook. The book retailer expects comparable-store sales to be between flat and an increase of 1% over the full year. Earnings are set to come in between $200 million and $250 million. The company said it is focusing on driving online sales, reducing expenses and growing its membership base. 

Bed Bath & Beyond (BBBY - Get Report) was under pressure after reporting a drop in quarterly profit. Comparable-store sales fell 0.5% compared to an increase of 2.2% in the year-ago quarter. Analysts expected a slight increase. The retailer has struggled to boost profits and margins as it weans itself off a reliance on sales promotions. 

Tesla (TSLA - Get Report) was downgraded to equal weight with a price target of $245 at Morgan Stanley. The firm said the proposed acquisition of SolarCity (SCTY) adds more risk to the model and will not benefit its core car business. Oppenheimer and Baird cut their price targets on SolarCity while Barclays revised its rating down to underweight.