Michael Peterson, Executive Vice President of SEI Investments Co, filed a Form 4 on September 1, 2026, disclosing the exercise of stock options and an open-market sale of common stock on August 28, 2026.

Key Highlights

  • Option exercise: Peterson exercised options on 37,500 shares of common stock at an exercise price of $56.54 per share on August 28, 2026.
  • Share sale: Peterson disposed of 37,500 shares at a weighted average price of $111.51, within a range of $111.19 to $112.07, on August 28, 2026.
  • Direct ownership following transactions: Peterson directly holds 20,148 shares of common stock following the reported transactions.
  • Indirect ownership: Peterson indirectly holds 454 shares through the company's Employee Stock Purchase Plan, including approximately 91 shares recently purchased through that plan.
  • Options fully disposed: The exercised options, originally received as employment compensation with an expiration date of December 8, 2030, now show zero remaining derivative securities beneficially owned.

Peterson's Option Exercise and Sale at SEI Investments Co

According to the filing, Michael Peterson, an Executive Vice President at SEI Investments Co (NASDAQ:SEIC), executed a same-day exercise-and-sell transaction on August 28, 2026. He acquired 37,500 shares of common stock through the exercise of stock options at a conversion price of $56.54 per share, using transaction code "M," which reflects an exercise of an in-the-money or at-the-money derivative security.

Immediately following that acquisition, Peterson disposed of the same 37,500 shares in an open-market sale coded "S," at a weighted average price of $111.51. The filing notes that the sale price represents a weighted average of a range from $111.19 to $112.07, and that Peterson "undertakes to provide to the Staff of the Securities and Exchange Commission, the Company, or any stockholder of the Company, upon request, full information regarding the number of shares sold at each separate price." Prior to the exercise, Peterson's direct beneficial ownership stood at 57,648 shares; after the disposal, his direct holdings were reduced to 20,148 shares.

The options exercised were originally received as employment compensation, had a date exercisable of December 31, 2024, and were set to expire December 8, 2030. Following the exercise, the filing reports zero derivative securities beneficially owned in that option grant. Separately, Peterson's indirect ownership of 454 shares held through the company's Employee Stock Purchase Plan reflects the addition of approximately 91 shares acquired through that plan. The Form 4 was signed by Lindsay A. Barci as attorney in fact for Michael Peterson.

What Was Disclosed

The filing reports a single-day option exercise of 37,500 shares at $56.54 and a same-day sale of 37,500 shares at a weighted average of $111.51 by SEI Investments EVP Michael Peterson, leaving him with 20,148 directly held shares as of August 28, 2026.