All three major US stock indexes fell in late-morning trading Monday as tensions between the US and Iran escalated over the weekend.

In company news, QXO (QXO) agreed to acquire TopBuild (BLD) for $17 billion. TopBuild shareholders can elect $505 a share in cash or 20.2 QXO common shares for each TopBuild share they own, subject to a cap that limits cash to 45% of the total consideration. The deal is expected to close in Q3. QXO shares fell 7.2% around midday, and TopBuild rose 17%.

Eli Lilly (LLY) agreed to acquire Kelonia Therapeutics for up to $7 billion in cash, including an upfront payment of $3.25 billion and subsequent payouts based on certain clinical, regulatory and commercial milestones. The deal is expected to close in H2. Eli Lilly shares rose 0.2%.

Alphabet's (GOOG, GOOGL) Google is in talks with Marvell Technology (MRVL) to develop two new processors optimized for AI inference tasks, The Information reported Sunday, citing two people with knowledge of the discussions. Alphabet shares fell 0.9%, and Marvell rose 4.1%.

American Airlines Group (AAL) said late Friday it was not engaged with or interested in talks about a merger with United Airlines Holdings (UAL). American shares fell 4.4%, and United dropped 2.3%.

Brady (BRC) agreed to acquire Honeywell International's (HON) productivity solutions and services business for $1.4 billion in cash. Brady shares eased 0.1%, and Honeywell fell 1.2%.

Price: 23.19, Change: -1.81, Percent Change: -7.24