The stock market enjoyed a big rally in the back half of March, and some corporate executives sold into that strength. Data from InsiderScore.com/Verity Group shows that the chief financial officers at several major companies sold 10% or more of their stock in their own companies over the past week. Sometimes, insider selling can be part of prescheduled plans or for tax reasons. However, some professional investors monitor these moves as a potential sign of future weakness, as they could hint that executives think their stock is overvalued. Here are some companies with notable insider sales over the past week, according to InsiderScore.com/Verity Group and securities filings. Akamai Technologies CFO Edward McGowan sold roughly $457,000 of shares on Tuesday , representing about 20% of his total stake. The security software stock is positive year to date, outperforming the broader market. Shares of Akamai have gained more than 11% in March. Ameriprise Financial The company's finance chief, Walter Berman, sold more than 40% of his shares on Monday in a transaction worth roughly $2.7 million. Shares of Ameriprise fell more than 10% during the first week of March, but they have since rebounded and erased those losses. Broadcom CFO Kirsten Spears sold 5,000 over two days this week , which totals more than 10% of her total stake in Broadcom . The sales were worth more than $3 million. The chip stock has had a volatile first quarter. Shares of Broadcom fell about 20% in the first three weeks of the year but have since rallied sharply. The stock was down about 5% for the year as of Wednesday's close.
Angel Navarrete | Bloomberg | Getty Images
The stock market enjoyed a big rally in the back half of March, and some corporate executives sold into that strength.