Clack Amy 4

What Happened

• Amy Clack, Chief Administrative Officer of Tradeweb Markets Inc. (TW), sold 271 shares in an open-market transaction on March 20, 2026 at $125.75 per share, generating proceeds of approximately $34,078. The trade is reported as a sale (S) and was executed under a pre-arranged trading plan.

Key Details

• Transaction date and price: March 20, 2026 — 271 shares at $125.75 each.
• Value: Approximately $34,078 total proceeds.
• Plan/authority: Executed pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 3, 2025 (Footnote F1).
• Shares owned after transaction: Not specified in the provided filing text. The filing does disclose unvested RSUs tied to Clack (see next point).
• Unvested awards disclosed (Footnote F2):
  • 2,434 RSUs vesting Jan 1, 2027
  • 2,434 RSUs vesting Jan 1, 2028
  • 4,418 RSUs vesting in equal installments on Mar 17, 2027 and Mar 17, 2028
  • 6,429 RSUs vesting in equal installments on Mar 15, 2027, Mar 15, 2028 and Mar 15, 2029 (All subject to continued employment.)
• Filing timeliness: Transaction reported on Form 4 filed March 24, 2026 for a March 20, 2026 trade. This meets the typical two-business-day reporting requirement and is not marked as late.

Context

• The sale was through a pre-set 10b5-1 plan, which allows insiders to transact automatically according to a schedule or formula and is generally considered a routine means to sell shares rather than an ad hoc signal about the company. As a sale, it is less informative than a purchase about the insider’s view of the stock.