Viking Global Reports 15% Stake in Standard BioTools Following Treeline Merger Voting Agreement

On June 12, 2026, Viking Global Investors LP and associated entities filed a Schedule 13D reporting a 15.0% beneficial ownership stake in Standard BioTools Inc. (LAB), representing 58,651,170 shares of Common Stock. This filing marks a transition from Schedule 13G to Schedule 13D following the execution of a Voting Agreement on June 6, 2026. The agreement was entered into in connection with Standard BioTools' planned merger with Treeline Biosciences, Inc. Under the terms, Viking has agreed to vote its shares in favor of the merger, a name change to 'Treeline Biosciences Holdings, Inc.', a reverse stock split, and new equity incentive plans. The shares were originally acquired through the conversion of Series B-2 Convertible Preferred Stock. Viking Global Opportunities Illiquid Investments Sub-Master LP holds 39,296,310 shares, while Viking Global Opportunities Drawdown (Aggregator) LP holds 19,354,860 shares. The reporting persons are currently subject to a 10-day 'cooling-off' period following this filing.