Alibaba Group Holding Ltd.'s IPO has officially become the biggest in history with $25 billion after underwriters exercised the "greenshoe" option and issued additional shares.

"Last Friday, Alibaba shares soared 38 percent in its first session, as investors clamored for a piece of the company, which is a massive bet on China's growing middle class. If the underwriters issue the maximum amount of 48 million additional shares at the offer price of $68 per share, this increases the amount initially raised last week from $21.8 billion to $25 billion," Reuters reported.

Earlier this month, Ecumenical News reported that Alibaba was going for a $163 billion valuation and $21 billion IPO.

Now, the stakes has gotten even higher as demand surges at a record pace.

Bankers responsible for the 15 percent boost on deal size include Credit Suisse Group AG, Deutsche Bank AG, Goldman Sachs Group Inc., JPMorgan Chase & Co., Morgan Stanley and Citigroup Inc.

This record-breaking traction is a proof that e-Commerce business is booming, and that China is becoming a stronghold of sorts.

The stellar IPO launch is just the beginning of massive opportunities for Alibaba.

In fact, its leaders are targeting to trump Walmart as the world's largest retailer by 2016.

"We want to be bigger than Walmart," said Jack Ma, the founder of Alibaba Group in an interview with CNBC.

"We want to learn from Walmart. They changed the business last century. They stressed the B2C. And we hope 15 years later they say this is a company like Microsoft, like IBM, like Walmart. They changed, shaped the world," Ma added.

Gordon Chang of Forbes, however, thinks otherwise:

"But don't expect Lu's prediction to come true. Alibaba is a great company with a terrific story to tell, but Walmart will still hold the crown as the planet's biggest store when 2017 arrives. I believe Alibaba's growth will slow considerably in 2015, if not in the second half of this year," Chang said.

The strong showing of Alibaba in the stock market underscores the growing appetite of investors for new listings and signals strength in U.S. stocks.