First Data Corp. said on Tuesday its shareholders voted in favor of its $26 billion leveraged buyout by Kohlberg Kravis Roberts & Co., but some investors remained unsure about whether the deal will close on time at current terms.

First Data said the company is still on track to close its sale to KKR by the end of the third quarter.

But the company's shares traded on Tuesday morning at 5.1 percent below the expected purchase price of $34.00.

Analysts have said the large gap between the planned sale price and where the shares were trading signal investor doubt about whether the deal would close at current terms.

The long-term financing for the deal is on shaky ground given recent turmoil in the debt markets.

But the deal will close in the third quarter even if only short-term financing is in place, the company's chief executive said earlier this month.

The company's shares traded at $32.35 on Tuesday morning on the New York Stock Exchange, or 5.1 percent below the KKR offer price of $34.