Are .si domains a good investment? (2026)

Clerion Research Team14 October 2026Updated 18 October 202612 min read

Are .si domains a good investment? For most buyers in October 2026, no. Registrations jumped past 400,000 names while only a handful of public resales cleared $5,000, so buy the .si name you will use and skip the pile you hope to flip.

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Are .si domains a good investment? For most people buying in October 2026, no. Registrations jumped from about 3,500 a month to over 400,000 names in total, while only a handful of resales have cleared $5,000. A .si name is worth buying if you will build on it. As a pile of names to flip, the math is against you.

That is the short version. The longer one matters because the boom is real, the sales are real, and the gap between those two facts is where most of the money gets lost.

Say you run an AI note-taking tool, you watched the "super intelligence" news last month, and a friend in a group chat says he grabbed forty .si names on a Sunday night. You are wondering if you missed the window. This post is the numbers you would want before you open a registrar tab.

Are .si domains a good investment right now?

A single .si name you plan to use is a cheap, sensible buy at around $10 to $24 a year. A portfolio bought to resell is a weak bet in late 2026: supply exploded past 400,000 names, the highest reported sale is $50,000, and very few buyers so far are companies that need the name.

Two things got mixed up in the excitement. One is whether .si will become a common extension for AI products. The other is whether a random .si name you register today will sell for more than it costs to hold. The first might happen slowly. The second needs a buyer for your specific name, and the data says those buyers are rare.

Domain investing has always worked like this. Most of what sits in any portfolio never sells. The few that do have to pay for all the renewals on the rest. A sudden boom makes that harder, not easier, because thousands of other people just did the exact same thing on the same weekend.

How big was the 2026 .si registration rush?

The rush was enormous. Before late September 2026, Slovenia's registry handled about 3,500 new .si names a month, according to a dpa report. By 14 October 2026 the register.si homepage showed 400,768 names in total, with 6,837 added in the previous 24 hours. When we checked again on 18 October 2026, the counter read 426,559.

The trigger was political. A UN speech on 22 September and an executive order on 29 September made "super intelligence" (SI) the official US federal term for AI. Our guide on what SI means covers that part. Domain buyers did the rest.

One registrar gives a closer look at who piled in. Hostinger counted 34,582 new .si names bought by 11,623 of its customers between 23 September and 7 October 2026. Daily sign-ups went from 529 on 29 September to 4,279 the next day, peaking at 5,654 on 5 October. US customers bought 8,917 of them and India 7,770. Slovenia didn't make the top 20.

For a feel of scale: the registry listed 102 accredited registrars on 18 October 2026 and sells only through them, so the rush hit dozens of storefronts at once.

What have .si domains actually sold for?

The best-publicised .si sales since the boom run from about $5,000 to $50,000. The highest so far is Staffing.si at $50,000, sold through Spaceship around 9 October 2026. Asking prices in the millions exist, such as build.si at $10 million reported by a .si reseller citing N1/STA, but an asking price is not a sale.

The average is far lower than the headlines. TLD Investors counted 194 reported .si sales worth $658,400 in the 30 days to 9 October 2026, using NameBio data, which works out to about $3,400 per sale.

Here is what has been reported in public, as of 14 October 2026:

Name	Price	Type	Date	Source
Staffing.si	$50,000	Sale (Spaceship)	~9 Oct 2026	Domain Blog
Recursive.si	$20,000	Sale to an AI company	Spring 2026	Hostinger
TravelAgent.si	$19,988	Sale (Spaceship)	4 Oct 2026	Crunch.id
Rate.si	$5,750	Wholesale (Dynadot)	4 Oct 2026	Crunch.id

Look at the names. Staffing, travel agent, rate: short, plain English words that a business in that trade could use anywhere. Recursive is the one clear case of an AI company paying for a match to its own brand, and Hostinger notes it still redirects visitors to its .com.

Before the boom, the market was thin. Hostinger cites a Domain Name Wire count of 35 public .si sales from 1 January to 9 June 2026, and only two of those buyers planned to use the name. The rest were investors selling to other investors.

On the forum side, the mood is split. A NamePros thread from late September argues keyword .si names will get "very expensive very quick", yet nobody in it names a single sale with a price. Replies point out that most deals so far are domainer to domainer, or brands buying their own name defensively.

Who is buying .si domains, investors or startups?

Mostly people who are neither AI startups nor serious investors. In Hostinger's sample only 3.2% of new .si names contained an explicit AI term, and 58.3% had no clear topic at all. Its customers averaged three names each, which looks more like curious individuals than bulk speculators or funded companies.

Hostinger's head of domains reads the same data as "still mostly end users rather than bulk speculators." That sounds bullish until you think about what it means for resale. If most registrants are individuals grabbing a name or three, very few of them are going to pay you five figures for yours.

The real end buyers are a short list: AI companies protecting a brand, and businesses that want a short generic word for their trade. That list is not 400,000 names long. A broker quoted in the comments on DomainInvesting.com said he had seen zero end-user inquiries for .si, while getting regular requests for .gg, .vc and .world.

Supply matters here. In the first week of October alone, Hostinger customers registered thousands of names. Each one competes with yours for the same small pool of buyers.

What does it cost to hold .si domains for resale?

Holding costs are low per name but they add up fast once you own a stack of them. As of October 2026, Porkbun lists .si at $20.35 for the first year on sale and $23.70 regular, with renewal on sale at $17.48. Hostinger's own page shows both $9.99 and $11.99 first-year prices, so check checkout totals.

Prices read on Porkbun and Hostinger on 14 October 2026. Hostinger's page contradicts itself: the header says $9.99 then $10.99 a year, the FAQ says $11.99 then $16.99. Plan on the higher one.

Now the worked example. This is hypothetical, built to show the shape of the math, not a forecast.

Say you registered 40 .si names on that Sunday night and renew them at Porkbun's regular $23.70:

Year one renewal bill: 40 × $23.70 = $948.
Three years of holding: $948 × 3 = $2,844, before marketplace fees.
To break even, one of the 40 has to sell for more than $2,844 after fees, inside three years.
If none sells, you are out $2,844 plus the first-year cost, and you're left holding 40 that nobody wanted.

Compare that to the table above. A handful of publicly reported sales above $5,000, against a pool of 400,000 names. Your 40 would need to beat those odds, and the reported winners so far are all plain dictionary words or an exact brand match.

There is also a rule many first-time buyers miss. If you stop paying, register.si puts the name in a 30-day quarantine, then deletes it so anyone can pick it up. You can cancel a new registration within 16 days, but only if the name has not been activated. Our post on who controls the .si domain covers the registry rules in more detail.

Did .ai and .io domains hold their value after their booms?

.ai did, and that is the case everyone points to. It reached 1,277,727 names by June 2026, renews at a reported rate of around 90%, and fin.ai sold for $1,000,000 in March 2025. But .ai had a decade of real AI startups behind it, and it costs $140 to $200 a year, which kept casual speculators out.

The .ai Wikipedia page puts Anguilla's 2023 income from the extension at about $32 million. That money came from companies that use their .ai names every day. Demand built slowly as AI startups launched, raised money and renewed. The .si rush happened in about ten days, driven by a word in a speech.

Price works as a filter too. A $140 two-year minimum on .ai means people think before they buy. At about $10 to $24 a year, .si invites exactly the forty-names-on-a-Sunday behaviour that floods supply.

.io is the warning on the other side. It became the default for developer tools, then its future got cloudy. The UK signed a deal on 22 May 2025 to hand the Chagos Islands to Mauritius, and the .io Wikipedia entry notes that IANA rules may require the extension to be phased out over at least five years. A country code's value depends on things no buyer controls.

.si has a stable owner, ARNES, Slovenia's academic network, so the .io risk does not apply directly. The lesson still holds: hype tracks a story, and stories change.

When is buying a .si domain worth it?

Buy a .si name when you would use it: your own product name, a redirect that protects your brand, or a short campaign domain. Skip it when the only plan is to sell it later. One name at $20 a year is insurance. Forty names is a bet against a market that just added 400,000 sellers.

Good reasons to buy:

Your brand name. Say your product is called Lumio. Owning lumio.si stops a squatter from parking it, for about the price of a lunch each year.
A redirect. Point it at your main site with a 301 redirect. Our guide on things to know before you buy a .si domain walks through the setup.
A real use in Slovenia or the EU. The extension is still Slovenia's country code, and "si" means "you are" in Slovene.

Weak reasons:

Flipping generic names you registered after 30 September, when tens of thousands of other people were doing the same.
Buying AI-sounding names on a guess that the US term sticks. The order binds federal agencies, not companies, so nobody has to switch.
Paying a reseller's asking price for a name you could build a brand on at .com or .ai for less.

If you already own a pile of these, the honest move is to sort them. Keep the ones tied to something you are building. List a few plain-word ones at a fair price. Let the rest drop at renewal instead of paying to hold hope.

And if you do point a .si name at your site, measure whether it sends anyone. Clerion shows referrals by source, including visits from ChatGPT, Perplexity, Claude and Gemini as their own channel, so you can see in a week whether that redirect earns its renewal.

Do this tonight

List every .si name you own or are about to buy, with its renewal price and date.
Mark each one "build", "protect" or "flip". Be strict about "flip".
For every "flip" name, search recent .si sales for a similar word. If nothing close has sold, set it to expire.
For your one "build" or "protect" name, turn on auto-renew and add a 301 redirect to your main site.
Write down what you paid in total. Check that number again in six months.

Is it too late to buy a .si domain?: which .si names are gone, what is still free, and when rush names may drop.
Things to know before you buy a .si domain: rules, prices and setup in one place.
Which AI startups use .si domains?: the companies actually building on .si so far.
Who controls the .si domain, and is it safe to build a brand on?: ARNES, the registry rules and your rights.

Frequently asked questions

Can you make money flipping .si domains?

Some people have: Staffing.si sold for $50,000 and TravelAgent.si for $19,988 in October 2026. But those are plain English words. Most of the 400,000+ .si names registered in the rush have no clear buyer, and each one costs about $10 to $24 a year to hold.

What is the most expensive .si domain ever sold?

As of 14 October 2026, the highest publicly reported .si sale is Staffing.si at $50,000, sold through Spaceship around 9 October 2026. Seven-figure numbers you may see online are asking prices, not completed sales.

How much does it cost to keep a .si domain each year?

About $10 to $24 a year depending on the registrar. In October 2026 Porkbun listed .si renewal at $17.48 on sale and $23.70 regular. Always check the renewal price, not the first-year promo price.

What happens if I stop renewing a .si domain?

The .si registry puts an unpaid name into a 30-day quarantine, during which you can still renew it. After that the name is deleted and anyone can register it.

Will .si become as valuable as .ai?

Nobody knows. .ai built value over a decade of real AI startups and costs $140 to $200 a year, which kept speculators out. .si demand arrived in about ten days after a political speech, and only 3.2% of new names in one registrar's sample mention AI.

Should my AI startup buy a .si domain?

Buy the .si version of your own brand name and redirect it to your main site. It is cheap brand protection. Do not move your main site to .si or buy extra names hoping to sell them later.

Sources

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