HubSpot Jumps 7% as the Braze Deal Turns Klaviyo Into the Next Takeout Target

Masthead deck. The $5.66 billion Braze acquisition stopped being a Braze story on Thursday: HubSpot surged as much as 7% on takeover arithmetic, and Jefferies used the deal to float Klaviyo as the next candidate. Underneath the ticker tape, Spamhaus set a November deadline that will start delisting senders whose HELO and reverse-DNS records are broken, the first hard infrastructure rule of the quarter.

At a glance

• The comp sheet moved. HubSpot traded up 6.9% on 22 October as analysts priced the next marketing-software takeout after Salesforce agreed to pay a 58% premium for Braze.
• Klaviyo is now the name in the crosshairs. Jefferies' Samad Samana called the Braze buyout the "spark" that could lead to a strategic takeout of Klaviyo, the last standalone public email platform of scale.
• A hard deliverability deadline landed. Spamhaus will begin enforcing valid HELO, PTR and matching A records for every sending IP starting in November 2026, rolled out over several months.
• The agents got account access. Selzy shipped an MCP server with 56 tools, and beehiiv put its own onboarding playbook inside its agent, in the same 24 hours.