Motorola (MOT) shares ended the day in positive territory Monday on the heels of an SEC filing disclosing that two top executives at the company had bought more shares.

According to filings with the Security and Exchange Commission, co-CEO Greg Brown bought 525,000 shares at about $3.83 each. The $2 million purchase brings his holdings to 2.2 million shares. Co-CEO Sanjay Jha, meanwhile, bought 200,000 shares for an average of $3.67 each and now owns about 3.9 million Motorola shares.

Motorola's stock closed Monday trading up 7% to $4.15.

The handset maker last week issued a

do-or-die product plan

after reporting

disappointing earnings

-- not especially unusual amid a deluge of woeful reports in its sector and elsewhere but nonetheless troubling as the company has struggled to keep up with the likes of

Nokia

(NOK) - Get Report

,

(SYMBOL)

,

Research In Motion

(RIMM)

and

Palm

(PALM)

.