Jim Cramer worries about tech insider selling, says AI 'mania' could be 'starting to unwind'
1. Jim Cramer warns about declines in the tech sector. 2. Insider selling resembles trends from the dotcom era. 3. Concerns grow over speculative AI stocks and secondary offerings. 4. Profitability of AI megacaps may shield the sector. 5. Cramer describes current market as a potential unwind from a mania.