Forbes Daily Briefing

The launch of Anthropic’s AI model Mythos a month ago sent shockwaves through the cybersecurity world. The tech was so advanced, the AI company said, that it had found dozens of severe bugs in critical internet code.

Now, cyber startup Depthfirst says its own AI model has found even more bugs that Mythos missed for just a tenth of the cost, including critical flaws that could affect the majority of people using the web today. Depthfirst CEO Qasim Mithani says that because Depthfirst optimizes its models for one task, it can do for $1,000 what Mythos does for $10,000.

Depthfirst, which raised $80 million at a $580 million valuation in March, is also launching Open Defense Initiative, a program that offers companies and open source developers a total of $5 million in credit to use its artificial intelligence to find bugs in their code. It’s similar in concept to Anthropic’s limited release of Mythos, which it gave to a group of nearly 50 companies (and it’s now expanding). Depthfirst won’t pick and choose who can access its model, but will review applicants, at first limiting it to open source developers whose code is widely used or deployed in critical infrastructure.

By Thomas Brewster,

Forbes Staff
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The middle-aged Pennsylvania couple had lived together for more than a decade, buying a home together and sharing other assets. They never got married. It didn’t matter, they thought. But after he died of cancer recently, leaving her his entire estate, it did matter. A lot. Pennsylvania is one of a handful of states that still imposes an inheritance tax–a tax on transfers from a person who has died to the people who inherit, with rates based on the category of recipient. Transfers to spouses, but not to unmarried partners, are exempt. Pennsylvania subjected everything she was left to inheritance tax at the state’s top 15% rate. The woman, who asked not to be identified, was shocked. 

Americans spend a lot of time thinking about where to live for tax purposes. States like Florida and Texas lure both billionaires and ordinary workers by touting their lack of a state income tax. Other states lure seniors with generous exemptions for retirement income. But another question gets less attention: Where is the most expensive place in the U.S. to die?

By Kelly Phillips Erb,

Senior Writer
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For decades, DIYers and construction pros have picked up yellow and red bags of Quikrete concrete mix from the shelves of America’s big box stores like Home Depot and used it for everything from anchoring mailboxes to patching driveways and making outdoor benches and steps. That in turn has generated billions of dollars for the little-known company and the little-known family behind the brand. 

But their time in the shadows may have come to an end. In February 2025, the privately-held building materials firm made a big splash when it paid $11.5 billion to acquire publicly traded competitor Summit Materials. The deal, which Forbes estimates boosted Quikrete’s revenue by around 50% to an estimated $12 billion, helped propel the Atlanta-based company onto Forbes’ first ever ranking of America’s Largest Family Businesses, published this week, at No. 43. Based on Forbes’ estimates, Quikrete is the 17th most valuable privately-held family business in America, making its founding Winchester family one of the country’s richest clans, worth an estimated $18 billion, thanks to their estimated 100% ownership of Quikrete.

“We’re proud of our heritage as an American, family-run company that has helped revolutionize the building and home improvement industries,” said Quikrete’s longtime former CEO Jim Winchester in a press release celebrating the company’s 75th anniversary in 2015. “From day one, my father Gene Winchester was driven to meet the needs of both contractors and homeowners with the highest-quality products at fair market value, and that commitment remains a core value of Quikrete today.”

By Matt Durot,

Forbes Staff

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Onan overcast April day in the middle of Rhode Island’s Narragansett Bay, Paul Lwin looks like he’s playing a vintage video game. He huddles over a laptop on the deck of the spartan vessel he’s taking out on the water today. Tiny boat icons float across the screen; he draws a box around them, selects a few parameters, and clicks “Start Play.” Seconds later, a set of driverless boats in the bay a mile away begin gliding in parallel with the icons, which leave bright blue tracks on the screen in their wake. Lwin flashes an enormous grin.

Each of those autonomous crafts is a “Rampage,” the 14-foot flagship boat of Lwin’s Providence-based company, Havoc, which outfits its vessels with technology that theoretically lets a single human control thousands at once. Lwin, 40, and his cofounder Joe Turner, 42, both Navy vets, aim to become the U.S. military’s go-to maker of specialized software for not just uncrewed boats, but all domains, after recently acquiring a couple of small aerial and land drone startups as well.

“The goal here is to make sure you don’t need to know anything about robotics or autonomy,” Lwin explains, showing the steps again on the laptop. “If it’s not this simple, it’s a science experiment. Operators—especially warfighters who don’t have PhDs in robotics, who don’t have PhDs in search algorithms—will never use it if it’s more difficult than this.”

By Monica Hunter-Hart,

Reporter
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From dinner at the White House for owners of his meme coin to a $400 million jet gifted by a petromonarchy that will be donated to his presidential library after he leaves office, Donald Trump has led the charge on extracting private gains from public office.

His Cabinet appears to have absorbed the lesson.

Take Sean Duffy, the former Fox host-turned-Secretary of Transportation. On Friday, his department dropped a trailer on YouTube unveiling the Great American Road Trip, an initiative purportedly designed as a “guide to the historic landmarks, open roads, and small towns that tell 250 years of this country’s story.” 

But what the trailer showed was a reality show in which Duffy, his still-a-Fox-host wife Rachel Campos-Duffy and their nine children gallivant around America. They meet a Ben Franklin impersonator in Philadelphia, ride snowmobiles in Montana and hang out with Kid Rock along the way. 

All in good fun. “We live in a PornHub world, and this is really good, wholesome family stuff,” Campos-Duffy said in an interview on—where else?—Fox.

By Kyle Khan-Mullins,

Forbes Staff
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