Credit firm Equifax says 143m Americans' social security numbers exposed in hack

• Atlanta-based company says 'criminals' accessed personal data
• Before notifying public, Equifax executives sold $1.8m in shares

Credit monitoring company Equifax says a breach exposed the social security numbers and other data of about 143 million Americans.

After discovering the breach, but before notifying the public, three Equifax senior executives sold shares in the company worth almost $1.8m. Since the public announcement, the company's share price has tumbled.