SeaChange International Inc. of Acton understated how much it paid a top officer last year by $200,000.

And a Bedford medical products maker, Hologic Inc., misstated the compensation for several executives by as much as $275,000 each.

These
are among the dozens of mistakes publicly traded companies in
Massachusetts made in reporting executive compensation to shareholders
and federal regulators over the past few years, according to a Globe
review of documents filed with the Securities and Exchange Commission.

The
errors ranged from $20 to more than half a million dollars. And
companies seemed as likely to overstate pay as to underreport it.