Eight of the biggest U.S. technology companies added a combined $69 billion to their stockpiled offshore profits over the past year, even as some corporations in other industries felt pressure to bring cash back home.

Microsoft Corp., Apple Inc., Google Inc., and five other tech firms now account for more than a fifth of the $2.10 trillion in profits that U.S. companies are holding overseas, according to a Bloomberg News review of the securities filings of 304 corporations. The total amount held outside the U.S. by the companies was up 8 percent from the previous year, though 58 companies reported smaller stockpiles.

The money pileup, reflecting companies' incentives to park profits in low-tax countries, has drawn the attention of President Barack Obama and U.S. lawmakers, who see a chance to tap the funds for spending programs and to revamp the tax code. That effort is stalled in Washington, and there are few signs that tech companies will bring the profits back to the U.S. until Congress gives them an incentive or a mandate.