Funding profile · Behavioral health data infrastructure

Attunement

No SEC Form D has been filed under the name Attunement or Attunement AI. What exists is a reported Y Combinator seed round of about $500,000, aggregator data that disagrees on whether the company has raised anything at all, and no later round of any kind on record.

$500KTotal raised, per CB Insights and Tracxn (2024)
$0Total raised, per a separate Getlatka profile (2026)
0Form D filings found under Attunement or Attunement AI

Data as of September 25, 2026. Company-reported figures are labeled.

Rounds at a glance

When Round Amount Investors Source
Jan 2024 Y Combinator, Winter 2024 $500,000, aggregator-reported Y Combinator, Ride Home Fund (Chris Messina) Aggregator data
Undated Same or later seed activity, described only in a founder’s own bio “1.5M+ USD,” unconfirmed Ride Home AI Fund, a Pebble Watch co-founder, unnamed “healthtech angels” Founder-stated

What the filings show

Nothing. A search of SEC EDGAR’s company database for issuers named Attunement or Attunement AI, and a full text search of Form D filings for the phrase “Attunement AI,” returned no results as of September 25, 2026. A separate record already on file for this profile, a Form D from PMO Chicago Holdings, LLC filed in December 2015, could not be tied to this company in any way, its name does not match, its filing date predates Attunement’s 2024 founding by nine years, and it is excluded from this page.

Reading the filings

  1. No Form D does not mean no money moved.Y Combinator’s standard deal issues a SAFE, and very early or very small rounds are sometimes closed under exemptions that do not require a Form D, or simply go unfiled for a stretch before a company’s first SEC filing. Either is consistent with what is on the record here: nothing.
  2. The aggregators do not agree with each other.CB Insights and Tracxn both list $500,000 total raised from Y Combinator and Ride Home Fund. A Getlatka profile, last touched in September 2026, lists $0 raised and says explicitly it has no funding information for the company. Neither cites a primary source, and there is no way from public records to say which is closer to current reality.
  3. The only larger figure comes from a founder’s own bio, not a filing.Co-founder Briar Smith’s Forbes Technology Council profile states that Attunement “raised 1.5M+ USD in funding, including from the founder of the hashtag, Chris Messina through Ride Home AI Fund, one of the founders of Pebble Watch, and several healthtech angels.” That is three times the figure the aggregators show, names no specific amounts per investor, and is not corroborated by any filing or independent report found.
  4. Y Combinator’s standard terms give a floor, not a ceiling.Independent reporting on the Winter 2024 batch, via University of Waterloo News, notes that YC funds successful applicants with $500,000 as part of the standard deal. That matches the aggregator figure and is the most defensible number here, but it describes what YC offers broadly, not a confirmed disbursement specific to Attunement.
  5. No later round shows up anywhere.No Series A, bridge, or subsequent seed extension was found in any source, filed or reported, as of September 25, 2026.

Commercial signals

Signal Detail Source type
Accelerator Y Combinator, Winter 2024 batch. Company page currently lists team size 3, status Active, no open jobs listed on the YC platform. Public record
Leadership Co-founder Briar Smith’s own current bio lists him as CEO of a separate company, NeuraWell, and refers to Attunement in the past tense. YC’s current page names only Angie Muller as founder. Differs from earlier record
Hiring Muller was personally recruiting a founding engineer as recently as October 2025, describing Attunement as still early-stage. Company-stated
Customers No named clinic, health system, or payer customer found in any source. Not found
Regulatory or clinical evidence No FDA record, registered trial, NIH or NSF award, or PubMed publication found. Not found

What to watch

  • Any Form D filing under Attunement, Attunement AI, or a related SPV name.
  • Whether the $1.5M figure in Briar Smith’s own bio is ever repeated or confirmed elsewhere, or whether it is a stale or inflated claim.
  • Clarification of current leadership and whether the company still operates with two founders or one.
  • Any named institutional or venture investor beyond Y Combinator and Ride Home Fund.

The Attunement story on Healthcare DiscoveryHealthcare Discovery

Related companies

  • mdhub: Similar focus. An AI native operating system that replaces the EHR, CRM and billing stack a behavioral health clinic normally stitches together from five vendors
  • Sohar Health: Similar focus. An API that tells a behavioral health clinic, in about six seconds, whether a patient’s insurance will actually pay
  • Caelum Health: Similar focus. A Y Combinator company that pitched software as a replacement for irritable bowel syndrome drugs, then shipped a diet coaching app
  • Metriport: Similar focus. An open source platform that pulls a patient’s scattered records out of the national health information networks and returns them as one structured file

Sources

  1. Public recordSEC EDGAR company search and full text search, Attunement and Attunement AI, Form DSEC EDGAR · searched Sep 25, 2026, no results
  2. IndependentAttunement AI company profileCB Insights · accessed Sep 25, 2026, page dated Feb 27, 2024
  3. IndependentAttunement company profileTracxn · accessed Sep 25, 2026
  4. IndependentAttunement company profileGetlatka · accessed Sep 2, 2026
  5. IndependentFour Waterloo-founded startups earn $2 million seed fundingUniversity of Waterloo News · Jul 13, 2026
  6. IndependentMeet the Y Combinator Winter 2024 cohort startups with Canadian rootsBetaKit, Isabelle Kirkwood · Apr 4, 2024
  7. Company-statedBriar Smith, CEO & Cofounder of NeuraWell, Attunement (profile bio)Forbes Technology Council · accessed Sep 25, 2026
  8. Public recordAttunement company and jobs pageY Combinator · accessed Sep 25, 2026
  9. CompanyFounding Engineer at Attunement, LinkedIn hiring postAngie Muller, LinkedIn · Oct 21, 2025

Compiled from SEC and other public records and published reports as of September 25, 2026. Form D notices report offerings under Regulation D; amounts reflect the filing date. Healthcare Venture Capital Fund holds no position in Attunement. This page is not an offer to sell or a recommendation to buy any security.