Anthropic Filed Its IPO. Should You Sell Your Peninsula Home Before the Lockup Ends?

The filing raises the same questions for every Peninsula owner, in several forms. Should we list before the IPO or after it? Does the money reach Menlo Park or stay in the city? Is this the year?

Most of the answers below come down to a calendar and a table, and both are on this page.

One caution before the detail. A headline is a poor reason to price a house. The numbers that should set your list price are the closings on your street last month, whichever way the stock trades.

What Did Anthropic File, and Why Does San Francisco Expect a Housing Effect?

Anthropic's S-1, the registration statement for its initial public offering, became public on October 26, 2026. The company says it intends to list its Class A common stock on the Nasdaq Global Select Market under the symbol ANT. The number of shares to be offered and the price range haven't been determined.

The scale is why City Hall is paying attention. Ted Egan, chief economist for the City and County of San Francisco, told ABC7 on October 27 that the company could be "potentially worth $2 trillion dollars." The city's last reference point for a wave of employee wealth was Uber's 2019 debut, valued near $82 billion at the time. Egan said the city is counting on more property and sales tax as employees turn shares into spending.

Reporting points at a debut before Thanksgiving. Bloomberg Government reported on October 1 that formal marketing could begin as soon as the week of November 9, with trading to follow before the holiday. None of that is confirmed until the registration statement becomes effective and the price range is set. Anthropic's own announcement says neither has happened yet.

For a Peninsula owner, the listing date is the headline. The dates that affect your sale come after it.

Does IPO Money Reach Peninsula Prices Before the Lockup Ends?

Some of it does. Employees generally can't sell during the lockup that follows a listing, but, as Egan told ABC7, "nothing stops them from getting a loan on the basis of those shares" and buying a house with it.

That's the mechanism to understand. A lockup, which the SEC says most agreements set at 180 days, delays the sale of shares. A lender willing to count those shares can fund a purchase before the lockup ends.

If Anthropic begins trading in mid-November, a 180-day lockup would lift in May 2027, with the exact terms set by the prospectus. The buyers tied to that date begin looking months earlier, and the ones with other liquidity or a share-backed loan are looking now.

Laura Pallin, an agent with The Agency, told ABC7 that cash offers have become common while inventory stays thin. A buyer up against ten or twenty others, she said, ends up "willing to do a lot more" than they had planned. The report's example was a Presidio Heights house with eight bedrooms, listed at $18.5 million, that closed $10 million above its list price.

For a buyer, that's one house in one San Francisco neighborhood. The Peninsula's September table below is the better read on what a competing offer looked like here.

For a seller, the question is whether your street is one those buyers shop, and whether your town's bidding is wide enough to price against.

Seven Things to Settle Before You List Into the Anthropic IPO

This is the list to keep, in the order I'd work through it with a seller this winter.

1. Your own date

The IPO may add a second wave of buyers in 2027, on top of the ones writing offers this winter, and a February sale is still right if February is when your life says to move. Set the month from your plans first, then see what the calendar adds.

2. The band your town is in this month

What buyers paid, read five ways: homes sold, median, price per square foot, days on market, and how far over the asking price the average home closed. September's figures for seven towns are in the table below, and Page One carries them for yours.

3. Whether your street is one these buyers shop

Walking distance to downtown Menlo Park or Palo Alto, a particular school attendance area, a direct Caltrain ride to the city: these are the filters a buyer with a lockup date applies. The street decides them. A town figure averages across every street in it. An estate on a Hillsborough acre is shopped by a different buyer on a different timeline, and the September numbers say so.

4. The pricing strategy, chosen after the band

Strategic underpricing, pricing at value, or pricing above it with room to move. Each is right somewhere. The next section says where, town by town.

5. Your equity and your next address

Selling first and buying after, or the reverse, with Freddie Mac's 30-year fixed at 7.32 percent on October 22. The order decides what the sale has to net and by when. Selling before you buy walks through the sequence.

6. The tax conversation, with your advisor, before the sign

The capital gains exclusion on a primary residence, the Proposition 19 base-year transfer for owners 55 and over, and the timing of both are questions for your CPA or attorney. Walk in with the September number for your town and the month you have in mind. Capital gains when selling in San Mateo County covers the questions to bring.

7. What the house needs before photographs

The sequence every one of my listings follows: the comparables, the position in the band, the number, then the calendar with a date on each step before the sign goes up. Preparation sits inside that calendar. The Home Refresh lists the moves, and the guide offered above puts them in your inbox.

What Does "Strategic Underpricing" Mean on the Peninsula?

It means setting the list price below the number the seller expects, so that the bidding finds the value instead of the list price. Pallin described the San Francisco version plainly.

"For single family homes we do strategically under-price so there is an expectation. What we can't predict is how much."

Laura Pallin, The Agency, to ABC7 News, October 27, 2026

The formula depends on the room being full. September's percent of list, by town, shows where it was.

Single-family residential, September 2026. Source: SAMCAR and SCCAOR, data compiled by MLSListings, Inc. Atherton and Woodside sit at or near the five-sale floor for a readable median, so weigh the count beside the figure.

In Palo Alto, 40 homes closed at an average of 109 percent of list in 16 days. There, a list price set under the expected number is a strategy, and the bidding has been there to finish it. In Hillsborough, 12 homes closed at 98 percent of list after an average of 42 days. There, the same list price is a discount, because the room isn't full enough to bid it back up. Menlo Park sat between the two at 104 percent, down from 106 in August. A list price has to respect that kind of movement month to month.

My read: underpricing is a bet on the count of buyers. One well-funded buyer pays the number they decide on. Ten of them bid each other up, and the tenth one sets the price. The IPO may add to the count on some streets in 2027. The September table says what the count was on yours last month.

Who the Anthropic IPO Doesn't Help

Sam Moss, who runs Mission Housing Development Corporation, told ABC7 that this IPO and the ones behind it will add pressure to a city where, in his words, "most of us can't afford houses already." On the Peninsula the same is true for a different reason. September's table was built by buyers who had no public Anthropic filing to borrow against, since the S-1 didn't become public until October 26. The buyers writing offers now are borrowing at rates above 7 percent.

If you price for a buyer who may never reach your street, you've priced for a headline. Price for the buyers in the table, and treat the IPO as the upside case. San Mateo County's September median was $2,175,000 on 1.4 months of supply, a seller's market by every measure.

Stay informed: Get monthly market updates and neighborhood insights delivered to your inbox. Subscribe to Lisa's Market Minute.

Know anyone weighing a sale this winter? Send them Page One.