Nvidia CEO Jensen Huang cuts a distinctive image, habitually clad in one of his many leather jackets. But it wasn’t Huang’s outfit that caught the attention of another tech founder who saw him in Manhattan last year: it was the phalanx of security guards walking behind him.

“He had a posse,” said the founder, who estimates Huang had at least five people in his detail.

It’s not just Huang. This founder said he has also noticed increased security around others such Databricks’ Ali Ghodsi and Shopify’s Tobi Lütke at industry events. Their bulked-up protection has made the founder—who would only speak on the condition of anonymity, lest he raise worrisome attention on himself—wonder if he should increase his security, too. (Neither Nvidia, Databricks nor Shopify would comment for this story.)