Regeneron Pharmaceuticals, Inc. insider George L. Sing sells $20.4M in REGN shares

A director at Regeneron Pharmaceuticals, Inc., George L. Sing, sold 21,129 shares of the company's stock on the open market on Nov 2. The sale, at an average of $964.38 a share, comes to about $20 million.

The filing does not mark the sale as made under a Rule 10b5-1 trading plan. The sale reduces the insider's holding by 46%, to 25,147 shares.

The trade was reported within two business days, as Section 16 requires. Three Regeneron Pharmaceuticals, Inc. insiders sold on the open market within 14 days, a pattern known as a cluster sell.

Details from the SEC filing:

The sale

Company	Regeneron Pharmaceuticals, Inc. (REGN)
Insider	George L. Sing
Role	Director
Transaction	Open-market sale (code S)
Shares	21,129
Average price	$964.38
Value	$20,376,358
Trade date	Nov 2, 2026
Filed with the SEC	Nov 4, 2026, 4:11 PM ET
Shares held after	25,147
Ownership	Direct
Rule 10b5-1 plan	Not marked in the filing

Open the full breakdown of this REGN trade

View the Form 4 on SEC.gov

See all the latest insider trades · See earlier insider stories on Regeneron Pharmaceuticals, Inc.

Source: SEC Form 4. Information only, not investment advice. Not affiliated with or endorsed by the U.S. Securities and Exchange Commission.