As the number and sophistication of cyberattacks jumps, financial firms are sharing more threat intelligence with each other, according to the Financial Services Information Sharing and Analysis Center, a nonprofit group that facilitates the exchange of cybersecurity intelligence.

The Securities and Exchange Commission’s $10 million settlement this week with an analytics firm suggests regulators are taking a harder line on the data-broker industry that investors increasingly rely on to make trades, legal experts and former SEC officials say.