Downgrade stings Stamps.com

Stamps.com shares fell 97 cents, or 18 percent, to $4.56 Monday after Goldman Sachs cut the stock from a "trading buy" recommendation to a "market outperform."

Stamps.com (Nasdaq: STMP) has taken its investors on an ugly ride in the past year, falling from a 52-week high of $98.50 in November to a low of $3.50 in August.

In its latest quarter, Stamps.com topped analysts' estimates but still posted a loss of $3.4 million, or 72 cents a share, on sales of $3.7 million.

Including a variety of one-time charges, the company had a net loss of $52.3 million, or $1.09 a share, in the quarter.

First Call Corp. consensus expects it to lose 87 cents a share in its third quarter.

All five analysts following the stock rate it a "buy."

Stamps.com provides a variety of Internet mailing and shipping services.