Form 4 Filing for Gregory Hughes

This filing details a transaction by Gregory Hughes, a director at Blackline, Inc. On May 21, 2026, Mr. Hughes sold 1,637 shares of Common Stock at a price of $30.25 per share, for a total transaction value of $49,506.25. This sale was conducted under a Rule 10b5-1 trading plan adopted on February 19, 2026. Following this transaction, Mr. Hughes directly owns 7,755 shares of Blackline, Inc. stock. The filing was signed by Karole Morgan-Prager, Attorney-in-Fact, on May 22, 2026.