Squarespace passed Tucows in September 2026 to become the fourth-largest .com domain registrar, according to ICANN and Verisign registration data covering May 2026 reported by Domain Name Wire on September 3, 2026. Squarespace now holds 9,437,739 .com domains after gaining 966,104 over the past year, while Tucows fell to 9,424,186 after losing 1,148,121 — proof that the registrar layer beneath the domain aftermarket is concentrating in ways that matter to any brand owner who assumed portability alone protected a trademark portfolio.

What just flipped in the .com registrar rankings?

The May 2026 data, drawn from Verisign’s monthly registry reports to ICANN and compiled by Domain Name Wire, shows GoDaddy still dominant with 52,681,256 .com domains, followed by Namecheap at 13,660,928 and Newfold Digital at 10,252,673. The real movement is at the fourth spot: Squarespace’s climb to 9,437,739 domains edged out Tucows’s 9,424,186 — a gap of roughly 13,500 domains after a year in which the two firms moved in opposite directions by more than a million registrations each.

New registrations for May 2026 tell a similar story of reshuffling beneath the leaders. GoDaddy added 722,018 new .com domains and Namecheap 592,915, but Hostinger’s 238,628 new registrations marked what Domain Name Wire called potentially its biggest month on record, and NameSilo doubled its prior month’s total. None of this activity required a policy change at ICANN — it happened entirely inside a namespace whose rules stayed fixed.

Why is a supposedly neutral namespace concentrating like a platform?

This blog has argued, most recently in coverage of Namecheap’s 2026 top-level-domain filings and X Corp.’s Handles Marketplace, that the .com aftermarket’s durability rests on registrar-level competition and Internet Corporation for Assigned Names and Numbers (ICANN) rules that guarantee a domain owner can transfer registrars without permission from any single company. That guarantee is real and still holds. What it does not guarantee is that the registrars themselves stay stable.

Tucows’s loss of 1.1 million domains in a single year is the same kind of shift the industry saw when Google exited domain registration entirely. Squarespace agreed on June 15, 2023, to acquire the Google Domains business — roughly 10 million domains across millions of customers, according to Squarespace’s own newsroom announcement and an SEC filing exhibit from that date — and completed the transfer that September. Domain Name Wire reported afterward that new registrations at the migrated accounts plummeted once Google’s promotional pricing lapsed. Portability protected each domain’s ownership through that transition; it did not protect the operational continuity of the accounts sitting on top of it.

What does registrar concentration cost a brand portfolio?

A trademark holder’s domain portfolio — the primary mark, the country-code variants, the defensive misspellings and prior product names — is rarely built at one registrar by design. It accumulates one renewal cycle at a time, often at whichever registrar was cheapest or most convenient years earlier. When that registrar loses market share, gets folded into an acquirer, or simply stops investing in its registrar business, the risk does not show up as a lost domain. It shows up as a lapsed auth code, a support queue that used to answer in minutes now taking days, a DNS management console frozen mid-migration, or a renewal notice that goes to an email address nobody has checked since the portfolio was assembled.

None of that is a portability failure in the ICANN sense — the domain can still move. It is a monitoring failure, because nothing about registrar-level competition forces a brand owner to notice a shift like Tucows’s until something breaks. The domain aftermarket’s advantage over platform handles was never that its infrastructure was risk-free; it was that the risk is visible and manageable, if someone is actually watching the registrar layer rather than assuming portability is a standing insurance policy.

What should IP and brand teams check before the next shift?

The Squarespace-Tucows crossover is a prompt for a portfolio audit most legal and brand teams have not run recently. Three questions matter most: Which registrar holds each domain in the portfolio, and has that registrar’s market position moved meaningfully in the past year? Does the team hold current auth/EPP codes for every domain, or does transferring one require reconstructing account access first? And is portfolio renewal routed to a monitored, role-based email address rather than an individual’s inbox that outlives their tenure but not their attention? A registrar that is shrinking is not an emergency by itself — but it is the signal that should trigger the audit before the emergency, not after.

Key takeaways

  • Squarespace overtook Tucows as the fourth-largest .com registrar in data through May 2026, gaining 966,104 domains over the year while Tucows lost 1,148,121, according to ICANN and Verisign data reported by Domain Name Wire on September 3, 2026.
  • ICANN’s transfer rules guarantee that a domain can move between registrars, but they do not guarantee that a registrar itself stays stable, well-staffed, or committed to the business.
  • Squarespace’s 2023 acquisition of roughly 10 million Google Domains accounts, and the registration slump Domain Name Wire later documented at those accounts, is a precedent for what registrar-side disruption looks like even when every domain remains legally intact.
  • A brand’s domain portfolio accumulates registrars by accident over years of renewals, which means most legal and IP teams do not know how concentrated or exposed their own portfolio is until they audit it directly.
  • The audit that matters now is not whether domains can be transferred — they can — but whether a team holds the access and monitoring needed to notice a registrar-side problem before it becomes a renewal failure.