Verizon may boost size of bond offering: Sources

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Verizon's jumbo $25 billion multitranche bond offering could be upsized because of strong investor demand, sources said on Tuesday.

The order book is approaching $100 billion, those sources said. Verizon was initially expected to sell about $25 billion of debt. But with the strong demand, the market is now expecting a $30 billion to $40 billion issue. Management hasn't made a decision yet on the ultimate size of the deal.

Books will close at 3 p.m. on Tuesday.

The deal is already set to surpass Apple's $17 billion debt offering earlier this year, which was the largest on record.

Verizon has launched the multi-tranche debt offering to fund its $130 billion buyout of Vodafone's stake in Verizon Wireless.

Verizon, Vodafone strike $130 billion deal
Verizon, Vodafone strike $130 billion deal

(Read more: Why $130 billion Verizon-Vodafone deal makes sense)

The multi-tranche bond deal consisting of three-year fixed and floating notes, five-year fixed and floating notes and four fixed-rate tranches with seven-, 10-, 20- and 30-year maturities, according to a filing with the Securities and Exchange Commission.

The 10- and 30-year tranches are seeing the most demand, sources said.

Barclays, BofA Merrill Lynch, JPMorgan and Morgan Stanley are the active bookrunners on the deal, with pricing scheduled for Wednesday.

Reporting by CNBC's Kayla Tausche