IBM Corporation's first-quarter net income and revenue declined due to delays in closing several of the technology company's large software and mainframe computer deals.

The results fell short of Wall Street's expectations, sending IBM's stock lower in after-hours trading.

IBM is seen as a good gauge of technology demand because it sells to major companies and governments around the world. But itt is not immune to economic uncertainty and currency fluctuations.

IBM said last night that it earned $3.03 billion, or $2.70 per share, in the three months from January to March - down 1% from $3.07 billion, or $2.61 per share, the same time a year earlier.

Last year's quarter had more outstanding shares, which lowers per-share results. Earnings excluding one-time items were $3 per share in the latest quarter, below Wall Street's expectations of $3.05 per share.

Revenue fell 5%, to $23.41 billion from $24.67 billion. Analysts had expected revenue to be nearly unchanged at $24.65 billion.

"Despite a solid start and good client demand, we did not close a number of software and mainframe transactions that have moved into the second quarter," said IBM chief executive Ginni Rometty in a statement.

"The services business performed as expected with strong profit growth and significant new business in the quarter," she added.

IBM has an Irish workforce of over 3,000 and has plants in Dublin, Cork and Galway.

Chief financial officer Mark Loughridge said on a conference call last night that weakness in the Japanese yen hurt earnings. A weak yen translates to fewer dollars for IBM on sales in Japan.

Adjusted for currency fluctuations, IBM said its revenue would have only declined by 3% for the quarter, rather than 5%.

Despite the fall in revenues, IBM kept its full-year guidance intact. It still expects adjusted, per-share earnings of at least $16.70 for 2013.

Rometty said the company expects to close the delayed transactions and expects to benefit from investments in growth initiatives. She said IBM is also trying to improve the weaker parts of its business.

The company has been focusing on growing its software business, which is more profitable, over hardware.

Revenue from technology services declined 4% during the quarter, to $9.6 billion, and business services revenue fell 3%, to $4.5 billion. Software revenue was flat at $5.6 billion, while hardware revenue dropped 17% to $3.1 billion.

IBM has had a good track record of beating or at least meeting Wall Street's expectations -the shortfall in profit and revenue is a rare miss. The company has now been able to grow its earnings per share for 41 consecutive quarters - more than a decade - even though it has not always increased net income.