Sell Stock or Borrow Against It? How AI Employees Are Financing Peninsula Homes
Here's a pattern we've noticed with buyers coming out of Anthropic and OpenAI: the ones who just went through a tender offer are often the most reluctant to sell more shares to buy a house. It sounds counterintuitive — they have more liquidity than ever, and yet they want to touch as little of it as possible. But it tracks. Anthropic's April tender undersold its own $5–6 billion target because employees chose to hold rather than sell, betting the IPO will price higher. If you believe your equity is worth more next year than it is today, selling a large block of it for a down payment is exactly the move you don't want to make.
That's where securities-backed financing comes in, and it's become a real part of how we structure purchases for equity-rich buyers on the Peninsula.
What a securities-backed line of credit actually does
A securities-backed line of credit lets you borrow against the value of a stock portfolio — public shares, and in some structures, private company shares subject to lender-specific eligibility — without selling the underlying position. You keep the equity, you keep the upside, and you access cash for a down payment or full purchase. The tradeoff is that it's a loan, not free money: it carries interest, and if the value of the pledged shares drops significantly, you may face a call to post additional collateral.
For someone holding Anthropic or OpenAI equity that's appreciated fast and is expected to keep appreciating into an IPO, this structure lets you participate in a home purchase now without locking in a sale price on shares you think are still climbing.
Why this matters more for private, pre-IPO equity
Public stock-backed lending is common and well understood. Private, pre-IPO shares are a different animal — not every lender will extend credit against them, and the ones who do typically require the shares to have a demonstrated recent valuation event, like a tender offer or funding round, to establish a lendable value. The good news for AI-sector employees right now: both Anthropic's $350 billion tender and OpenAI's recent secondary in the $400–500 billion range created exactly that kind of recent, documented valuation. That's useful collateral evidence in a way it wasn't a year ago for employees at either company.
How this plays out on a Peninsula purchase
Jumbo and super-jumbo financing is already the norm for most home purchases in Burlingame, Hillsborough, and San Mateo, where price points routinely exceed conforming loan limits. Layering a securities-backed line of credit into that picture typically shows up one of two ways:
Using the line of credit to fund the full down payment while taking out a traditional jumbo mortgage for the balance — this keeps your equity position completely intact and spreads the home's cost across two financing sources instead of one large stock sale.
Using the line of credit as a bridge to move fast on an all-cash offer, then refinancing into a traditional mortgage after close — this is the structure we've used most often for buyers competing in situations where a clean, fast close matters more than the lowest possible interest rate. It's worth noting the leverage has shifted back toward buyers this year: Belmont's active inventory nearly tripled this spring, and homes closing over asking dropped from about 79% to roughly 50%, so the urgency to compete with an all-cash structure isn't what it was twelve months ago.
What to weigh before you go this route
This only makes sense if you're genuinely confident in your equity's trajectory and comfortable with the fact that a lender can require additional collateral if the value drops. It's not a fit for every buyer, and it's not something we advise on directly — that's a conversation for your wealth advisor and a lender who specializes in this kind of lending. What we can tell you is how it fits into a real estate transaction, what timelines it allows for, and which properties on the Peninsula are realistic given the amount you're able to access this way.
If you're weighing whether to sell shares or finance around them for a Peninsula purchase, we're happy to talk through what we've seen work. Reach Casey Sternsmith at [email protected] or 650-678-5455.
