NEW YORK — The stock market is keeping its momentum going, giving shares their best week in more than two months.

Moderate gains yesterday led by health care and utility companies pushed stocks to a 4 percent gain for the week, their best performance since July. The Dow Jones industrial average reached its highest level in a year.

Bond prices tumbled, extending the previous day's losses, as the Treasury market struggled to absorb $71 billion of new supply auctioned off this week in the government's ongoing efforts to fund its stimulus programs.