system
A chat on subreddit /r/wallstreetbets
human
This is why you use a secure service like iMessage, can't be turned over by your carrier. Apple has denied the FBI access numerous times, no way in hell the SEC would ever get access. Not to mention not even Apple can read your messages if they wanted to.

gpt
Or, you know, just don't do any insider trading. The SEC might not be able to read iMessage but they probably have the resources to dig so deep that texting is the least of your problems.