Watermark Medical

What Watermark Medical does

Watermark Medical, founded in 2008 and headquartered in West Palm Beach, Florida, is a privately-held medical device and services company that provides home sleep testing solutions for diagnosing obstructive sleep apnea (OSA). Its core product is the ARES (Apnea Risk Evaluation System), an FDA-cleared forehead-worn wearable that records up to nine or ten channels of physiological data over one to three nights — airflow, snoring, dual forehead-based SpO2, heart rate, EEG, EOG, EMG, head position and movement, with optional respiratory effort. The data flows into a HIPAA-compliant cloud portal reviewed by trained sleep technicians and board-certified sleep physicians. Watermark reports an AHI correlation of 0.96 against in-lab polysomnography (PSG), sensitivity/specificity of 0.95/0.94 versus in-lab reference, and what it characterizes as the lowest documented failure rate and 0% clinical correlation gap to PSG in the home sleep testing category.

Watermark monetizes through a hybrid model combining hardware sales (the ARES device and consumable single-use kits sold to practices), per-test diagnostic service fees under a Direct-to-Patient Service Solution, and downstream Medicare and commercial insurance reimbursement support. Go-to-market is organized around three channels: a B2B field-sales motion into physician practices, dental offices, hospitals and clinics; a direct-to-patient logistics service in which Watermark mails devices to patients, processes results, and bills the practice a fixed per-test fee; and an enterprise sales effort to self-insured employers, municipalities, transportation firms and first-responder organizations for annual subscription population-health screening programs. Patient and provider education content, a clinically-validated Sleep Risk Questionnaire, and a mobile app for ARES 620 data transfer support the funnel. An ARES Provider Network of more than 400 board-certified sleep physicians, cardiologists, pulmonologists, dentists and clinics supports interpretation and downstream CPAP/oral-appliance referrals.

The company is founder-led by CEO Sean Heyniger, who previously co-founded PDSHeart (sold to CardioNet in 2007), with Jack Fiedor as President and CFO, Greg Poulos as COO and CIO, and Gregory A. Marsh as VP Transactions. Cumulative scale metrics include 1.3M+ home sleep tests performed and 75,000+ healthcare providers served since inception. The company underwent a 2019 restructuring involving the sale of numerous business segments, and has launched the next-generation ARES 620 device (with Bluetooth, dual SpO2 sensors and a remote-send feature) and a companion mobile app in 2022. Cumulative disclosed funding from 2009 through 2017 totals roughly $33M across multiple rounds including $15M from CA Technologies and $6M led by Ballast Point Ventures; no institutional round has been publicly disclosed since the December 2017 financing.

Name

Watermark Medical

Legal name

Watermark Medical, Inc.

Website

https://watermarkmedical.com

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

101–250 employees

Short description

Watermark Medical provides FDA-cleared ARES home sleep testing devices and a cloud-based diagnostic platform for obstructive sleep apnea, serving U.S. physician practices, dental offices, hospitals, self-insured employers, and a 400+ physician interpreting network.

Ownership category

akta.pro rank

Product category

Sleep Diagnostics

NAICS

Electromedical and Electrotherapeutic Apparatus Manufacturing (334510), Home Health Care Services (621610)

SIC

Surgical & Medical Instruments & Apparatus (3841), Services-Home Health Care Services (8082), Services-Testing Laboratories (8734)

akta.pro primary industry

Sleep Diagnostics & Monitoring (PSG/Home Sleep Testing, Actigraphy) (HLAHAGAB)

akta.pro secondary industries

Remote Diagnostics & Point-of-Care (Connected Testing, Home Lab Devices) (HLACAPAK), Clinical-Grade Vital Signs Monitoring (ECG, SpO2, BP, Temp, Respiration) (HLACAPAI), Home Respiratory & Sleep Therapy Providers (DME-Integrated) (HLAFAEAF), SaMD – Digital Biomarkers & Algorithmic Endpoints (HLACANAF)

Keywords

• Home sleep testing
• Sleep diagnostics devices
• Obstructive sleep apnea diagnosis
• Portable sleep monitoring
• Medical device manufacturing

Headquarters

HQ city

West Palm Beach

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure, Others

Revenue model

1. Home Sleep Test Device and Consumables Sales: Watermark Medical sells the ARES device and single-use test kits to healthcare provider practices, enabling them to conduct home sleep tests. Practices purchase devices and ongoing consumable kits for patient testing.
2. Per-Test Diagnostic Service Fees: Under the Direct-to-Patient Service Solution, Watermark Medical bills healthcare practices a fixed per-test fee for comprehensive diagnostic testing services. The practice retains billing activities with the patient and/or insurance company.
3. Insurance Reimbursement: The ARES home sleep test is reimbursable under Medicare and commercial insurance plans, providing a revenue stream through third-party payer reimbursement. The company assists in organizing insurance coverage on behalf of clients.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

Watermark Medical provides home sleep testing solutions for the diagnosis of obstructive sleep apnea, centered on its FDA-cleared ARES (Apnea Risk Evaluation System) wearable forehead device and proprietary cloud-based platform. The company sells the ARES device and single-use test kits to healthcare providers (physician and dental practices, hospitals, clinics) and operates a Direct-to-Patient Service where it mails devices directly to patients, performs data interpretation by board-certified sleep physicians, and bills providers a fixed per-test fee. The offering also extends to enterprise employer wellness programs targeting population sleep health.

Product overview

Watermark Medical offers a unified product ecosystem centered on the ARES (Apnea Risk Evaluation System) Home Sleep Test Solution. The core offering combines the FDA-cleared ARES device hardware (now in its 620 generation) with a proprietary cloud-based platform and mobile app. The system collects nine channels of physiological data (airflow, SpO2, EEG, EOG, EMG, heart rate, head position, head movement, snoring) over up to three nights to diagnose obstructive sleep apnea. This data flows through the Watermark Cloud Portal where licensed sleep technicians and Board-Certified physicians review and interpret results. The ecosystem also includes the ARES Sleep Risk Questionnaire for initial screening and an extensive Provider Network connecting patients with sleep specialists, dentists, and therapy providers.

Differentiator

Problem solved

Functional benefit

Brands

• ARES: The ARES (Apnea Risk Evaluation System) is Watermark Medical's proprietary FDA-cleared home sleep test device and platform for diagnosing obstructive sleep apnea

Products and services

• ARES Home Sleep Test (HST) Solution

Quantifiable outcome

• 1,300,000+ home sleep tests performed since company inception
• +6 more outcomes

Named customers3 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability5 records

Feature9 records

Partnerships

One partnership is on record.

• ARES Provider Network MemberscoreChannel Partner/ Reseller/ DistributorWatermark Medical has built a national network of dedicated medical professionals including Primary Care Physicians, Family Practice, Internal Medicine, Board Certified Sleep Physicians, Cardiologists, Pulmonologists, Dentists, and Hospitals & Clinics. These providers collaborate to deliver sleep diagnostic services and treatment, driving patient referrals through the Watermark platform. The network enables physicians to access new patient populations and connect patients with therapy providers.

Scale indicators8 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Itamar Medical (ZOLL Medical / Philips): Itamar's WatchPAT is the leading disposable home sleep apnea test with finger-based PAT signal capture and FDA clearance. It is the closest direct competitor to ARES in the HSAT category, targeting the same physicians, dental practices, and enterprise wellness buyers.
• CleveMed: CleveMed's SleepView is an FDA-cleared Type III home sleep testing device sold to physician practices and sleep specialists. It targets the same HSAT use case as ARES, with comparable channels into primary care, dental sleep medicine, and cardiology.
• Nox Medical: Nox Medical builds the Nox T3 portable sleep monitor used for HSAT and ambulatory PSG. It is a direct peer in hardware-led sleep diagnostics, competing for sleep labs and home testing programs globally.
• SOMNOmedics: SOMNOmedics produces the SOMNOwatch and Domino systems for ambulatory sleep diagnostics, including home-based respiratory and EEG recording. It is comparable to Watermark in offering multi-channel home sleep testing with EEG capabilities.
• NovaSom: NovaSom (now part of Itamar/ZOLL) historically operated a service-based home sleep testing model similar to Watermark's Direct-to-Patient Service Solution. The two companies share the payor-aligned, per-test-billing approach to HSAT delivery.

Broad incumbents

• ResMed: Global sleep apnea leader with the NightOwl HSAT (acquired via Ectosense) and the dominant CPAP therapy franchise. ResMed competes in HSAT as part of a vertically integrated diagnosis-to-therapy portfolio and bundles its home sleep test with CPAP sales.
• Compumedics: Compumedics manufactures both in-lab PSG systems (Compumedics E-Series) and HSAT/home monitoring devices (Somfit, Somte). It overlaps with Watermark on the home testing side while also serving the broader sleep lab market.
• Cadwell Industries: Cadwell builds neurodiagnostic and PSG equipment used in sleep labs and clinics. While more focused on in-lab PSG, Cadwell is comparable as a sleep diagnostics hardware vendor and indirect competitor for sleep lab vs. home-based testing budgets.

Emerging players

• BMC Medical: BMC Medical is a Chinese manufacturer of HSAT, CPAP, and respiratory care devices expanding into the US market. It competes with Watermark on price for entry-level HSAT and increasingly into physician and DME channels.

Regional players

• BioSerenity (SleepMed): BioSerenity operates SleepMed sleep diagnostic centers (including Mid-Atlantic Bio Serenity, an existing Watermark customer) and offers home sleep testing services. It is a comparable service-led HSAT provider competing for the same physician and employer channels.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/watermarkmed
• Facebookfacebook.com/Watermark-Medical-115818989968149
• LinkedInlinkedin.com/company/watermark-medical-llc
• Instagraminstagram.com/watermarkmedical

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds5 records

Investors2 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Watermark Medical