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Warren Buffett's Berkshire Hathaway (BRK.A - Get Report) revealed its first investment in online giant Amazon Inc.  (AMZN - Get Report) Wednesday, a stake that is now closing in on $1 billion. 

Berkshire Hathaway owned 483,300 shares in Amazon as of March 31, the investment group said in a regular filing with the Securities and Exchange Commission, a stake that is now worth over $920 million based on last night's closing price of $1,871.15 per share. Buffett told CNBC earlier this month of the stake purchase, his group's first investment in Amazon, while chiding himself as an "idiot" for not buying it sooner.

"Todd (Combs) and Ted (Weschler)," Buffett said on May 2, referring to two of his key portfolio managers. "One of them bought some Amazon, so it will show up on the 13F. It is not true to say that I am buying Amazon. It's true to say that Berkshire is what whatever shows up there."

"I've been a fan (of Amazon CEO Jeff Bezos) and I've been an idiot for not buying," Buffett told CNBC's Becky Quick. "But I just want you to know that it's no personality changes taking place or anything. It's somebody else's."

Amazon shares were marked 2.25% higher at the start of trading Thursday to change hands at $1,913.23 each, a move that would extends the stock's year-to-date gain to around 27.4%.

Amazon has rebounded some 15% since shedding more than $40 billion in market value on a single day following a weaker-than-expected second quarter sales forecast on February 1.

Amazon said earnings for the three months ending in December surged to $6.04 a share, well ahead of the consensus forecast as sales rose 20% to a record $72.4 billion, but the group also guided for first quarter sales in the region of $56 billion to $60 billion, missing the Refiniitv estimate of $60.77 billion, citing regulatory uncertainty in India, a key growth market, raising questions over its uneven international strategy.

"There is much uncertainty as to what the impact of the government rule change is going to have on the e-commerce sector there," CFO Brian Olsavsky told investors on a conference call late Thursday, in reference to new rules that restrict foreign-owed companies from selling good through vendors in which they have an ownership stake. "We remain committed to complying with all laws and regulations, we will, but we're evaluating the situation."

Amazon said earnings for the three months ending in December surged to $6.04 a share, well ahead of the consensus forecast of $5.68, as sales rose 20% to a record $72.4 billion. However, the group also guided for first quarter sales in the region of $56 billion to $60 billion, missing the Refiniitv estimate of $60.77 billion, citing regulatory uncertainty in India, a key growth market, raising questions over its uneven international strategy.

"There is much uncertainty as to what the impact of the government rule change is going to have on the e-commerce sector there," CFO Brian Olsavsky told investors on a conference call late Thursday, in reference to new rules that restrict foreign-owed companies from selling good through vendors in which they have an ownership stake. "We remain committed to complying with all laws and regulations, we will, but we're evaluating the situation."

"We feel very good about the long term prospects in India and doing a good job for both Indian customers and Indian sellers. The new regulations (must not have) unintended consequences," he added. "And again, I don't think it's necessarily consistent with better price, better selection and better convenience for the Indian customer."