Guardant Health
NASDAQ: GHRedwood City, US Β· Founded 2011 Β· Delaware corporation Β· 4,797 employees on LinkedIn Β· Public Β· 13 known investors
Guardant Health develops blood-based testing (liquid biopsy) for cancer detection and monitoring across all stages of the disease. The company serves oncologists, patients, and biopharmaceutical firms with FDA-approved tests for cancer screening, early-stage risk assessment, and treatment selection.
Also known as GH Β· Guardant Health, Inc.
Founders & leadership
Guardant Health was founded in 2011 by AmirAli Talasaz and Helmy Eltoukhy.

Board

Investors Β· 13
Reported raises Β· per SEC filings
Form D private placements$500M disclosed across 5 of 8 rounds Β· 2013β2018
βΆ$320.4MraisedAug 2017 Β· 17 investors Β· BiotechnologyRule 506(b)
- Samir KaulDirector
- Michael WileyExecutive Officer
- Helmy EltoukhyExecutive Officer, Director
- AmirAli TalasazExecutive Officer, Director
- Aaref HilalyDirector
- Offering amount
- $320.4M
- Amount sold
- $320.4M
- First sale
- May 2017
- Incorporated
- Corporation, Delaware
- Federal exemptions
- 06b
βΆ$82.8MraisedMar 2016 Β· 14 investors Β· BiotechnologyRule 506(b)
- Samir KaulDirector
- Michael WileyExecutive Officer
- Helmy EltoukhyExecutive Officer, Director
- AmirAli TalasazExecutive Officer, Director
- Aaref HilalyDirector
- Offering amount
- $100M
- Amount sold
- $82.8M
- First sale
- Dec 2015
- Incorporated
- Corporation, Delaware, 2011
- Federal exemptions
- 06b
βΆ$56MraisedMar 2015 Β· 21 investors Β· BiotechnologyRule 506(b)
- AmirAli TalasazExecutive Officer, Director
- Warren HogarthDirector
- Michael WileyExecutive Officer
- Helmy EltoukhyExecutive Officer, Director
- Samir KaulDirector
- Offering amount
- $60M
- Amount sold
- $56M
- First sale
- Dec 2014
- Incorporated
- Corporation, Delaware, 2011
- Federal exemptions
- 06b
βΆ$31.5MraisedApr 2014 Β· 7 investors Β· BiotechnologyRule 506(b)
- Michael WileyExecutive Officer
- AmirAli TalasazExecutive Officer, Director
- Warren HogarthDirector
- Samir KaurDirector
- Helmy EltoukhyExecutive Officer, Director
- Offering amount
- $32.5M
- Amount sold
- $31.5M
- First sale
- Apr 2014
- Incorporated
- Corporation, Delaware, 2011
- Federal exemptions
- 06b
βΆ$9.2MraisedFeb 2014 Β· 36 investors Β· BiotechnologyRule 506(b)
- Helmy EltoukhyExecutive Officer, Director
- AmirAli TalasazExecutive Officer, Director
- Michael WileyExecutive Officer
- Warren HogarthDirector
- Offering amount
- $10M
- Amount sold
- $9.2M
- First sale
- Apr 2013
- Incorporated
- Corporation, Delaware, 2011
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
Valuation Β· disclosed
Disclosed eventsSource: SEC prospectus filings, and round valuations the company or its investors disclosed β follow each entry's link for the claim.
Company profile
researched Aug 2026Guardant Health, Inc. is an American biotechnology company that develops and sells liquid biopsy tests, which detect cancer from mutations and other modifications found in blood samples. Its portfolio spans the stages of cancer care: a screening test for colorectal cancer from a routine blood draw (Shield), tests that help identify risk of recurrence and monitor recurrence in early-stage cancer, comprehensive genomic tests that guide treatment selection and monitor treatment response in advanced cancer, and services for biopharmaceutical drug development.
Core products include Guardant360, a biopsy-free tumor sequencing test launched commercially to oncologists in 2014 that sequences circulating tumor DNA to track tumor genomics and identify associated treatment options; GuardantOMNI, launched in 2017 for biopharmaceutical research; Guardant Reveal, used for residual and recurrent disease monitoring; and the Lunar early-stage cancer assay released for academic and biopharmaceutical research in 2019. The company states it secured the first U.S. FDA-approved blood tests for comprehensive genomic testing and for primary colorectal cancer screening. Guardant360 required two blood samples and examined 73 genes as of 2019, had been used across 50 cancer types by 6,000 oncologists for 100,000 patients, and Japan's Ministry of Health, Labour and Welfare granted regulatory approval of Guardant360 CDx as a companion diagnostic.
The company reports on its website that more than 1,000,000 of its blood tests have been performed by 12,000 doctors to date. Corporate headquarters are at 3100 Hanover Street, Palo Alto, California, with a laboratory at 505 Penobscot Drive, Redwood City, California.
Founding story
Co-founders Helmy Eltoukhy and AmirAli Talasaz met at Stanford University in 2002 and worked together at Illumina until Talasaz departed in 2012. They developed a technique for detecting and monitoring tumor fragments circulating in a patient's bloodstream as an alternative to tissue biopsies, and co-founded Guardant Health during 2012β2013. Early in its history the company acquired multiple patents from Swiss biochemist Maurice Stroun, who became a founding advisor. The company describes its founding premise as making genomic data actionable for routine clinical use through liquid biopsy.
Business model
Guardant Health earns revenue from test fees paid by third-party insurance companies and by drug developers. Tests are ordered by physicians and oncologists; the biopharma segment sells testing and data services supporting drug development. The company reported $374 million in revenue in 2021.
Fee-per-test reimbursement from third-party payers (including Medicare and commercial insurers such as UnitedHealth Group for the Shield colorectal screening test) plus payments from biopharmaceutical customers using its tests in drug development.
Traction
Over 1,000,000 blood tests performed by 12,000 doctors to date per the company website; $374 million in revenue in 2021; Guardant360 used across 50 cancer types by 6,000 oncologists for 100,000 patients and by 50 biopharmaceutical companies as of 2019; Medicare and, as of 2026, UnitedHealth Group coverage for the Shield colorectal screening test.
Latest developments
Company press releases dated July 2026 report second quarter 2026 financial results with increased 2026 revenue guidance, UnitedHealth Group coverage of the Shield blood test for colorectal cancer screening (July 1, 2026), and an awareness campaign featuring actor and cancer advocate Patrick Dempsey memorializing those who died of colorectal cancer (July 28, 2026).
βΈFull profile β market position, technology, go-to-market, geography, history, risks & controversies
Market position
A publicly traded precision oncology company; a directory listing names GRAIL, Freenome and NeoGenomics as competitors. In colorectal cancer screening, a competing stool-based test was reported as 92 percent accurate versus the 83 percent reported for Guardant's blood test in its 2022 study readout.
Positioned as offering biopsy-free, blood-based tumor sequencing that tracks tumor genomics in real time, with claims of the first U.S. FDA-approved blood tests for comprehensive genomic testing and for primary colorectal cancer screening, and a product line spanning screening, early-stage recurrence monitoring, advanced cancer treatment selection and biopharma services.
Technology
The technology sequences circulating tumor DNA β fragments of DNA shed into the bloodstream by dying tumor cells β from blood samples to identify actionable tumor genomic alterations, assess treatment response, detect residual disease and detect early signs of cancer. The company positions this as faster than tissue-based methods and performable in a doctor's office.
Go-to-market
Direct sales of laboratory tests to oncologists and healthcare providers, supported by payer reimbursement (Medicare and commercial coverage) and a patient support program, Guardant Access, that assists with insurance eligibility, claims appeals, billing and financial assistance. The company also partners with the National Cancer Institute, large pharmaceutical companies, academic medical centers and patient advocacy organizations such as Susan G. Komen, the Colon Cancer Coalition and Fight Colorectal Cancer, and used a joint venture with SoftBank to reach markets in Africa, Asia and the Middle East.
Oncologists and other physicians ordering tests for patients across all cancer stages, patients undergoing colorectal cancer screening, third-party insurers as payers, and biopharmaceutical companies using the tests and data for drug development.
Geography
Corporate headquarters in Palo Alto, California (approximately 250,000 sq ft at the former Hewlett Packard Enterprise campus), a laboratory in Redwood City, California, and offices and labs in Torrey Pines, San Diego (37,000 sq ft, 55 employees as of 2022). Roughly 900 of about 1,400 employees were in California as of 2022. International expansion into Africa, Asia and the Middle East ran through the Guardant Health AMEA joint venture, and Guardant360 CDx received Japanese regulatory approval as a companion diagnostic.
History
Wikipedia dates the company's founding to 2012, with co-founders Helmy Eltoukhy and AmirAli Talasaz establishing it during 2012β2013; one directory also lists Michael Wiley among founders. Guardant360 went on sale to oncologists in 2014. The company held 40 patents by 2015, announced clinical trial results in 2016 showing detection of disease-associated mutations also present in 94%β100% of solid tissue samples, and launched GuardantOMNI in 2017. It went public on Nasdaq in 2018, raising $237.5 million at a $3.3 billion valuation. Medicare coverage of Guardant360 began in 2018 for select lung cancer patients and expanded to solid tumors in 2019, followed by FDA approval in 2020. In December 2022 it reported results of a 20,000-participant colorectal cancer screening study begun in 2019, and in 2022 it acquired the Guardant Health AMEA joint venture for roughly $178 million.
Risks & controversies
In December 2022, results of the company's 20,000-participant colorectal cancer screening study showed 83 percent accuracy in detecting cancer with a 10 percent false positivity rate; Bloomberg reported this fell short of the 85 percent investors expected and the stock price declined, with a competing stool-based test reported at 92 percent accuracy. Sources also show inconsistencies in reported founding year (2011 internally versus 2012 per Wikipedia) and total funding figures ($550 million per Wikipedia, more than $500 million per one funding report, $1.9 billion per a startup directory).
Compiled by commissioned research from 8 cited public sources β announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed β not independently audited.
Competitors Β· 6
by search overlapCompanies competing with Guardant Health for the same Google search keywords, organic and paid, via search-intersection analysis.
Timeline Β· 18
launches, deals, and filingsGuardant Health reported second quarter 2026 financial results and increased its 2026 revenue guidance, per a company press release headline.
Company press release states UnitedHealth Group now covers Guardant Health's Shield blood test for colorectal cancer screening.
Guardant Health announced results from a 20,000-participant study, begun in 2019, of its blood-based colorectal cancer screening test in average-risk individuals. The test was reported as 83% accurate at detecting cancer with a 10% false positivity rate; Bloomberg reported the results fell short of the 85% accuracy investors expected and the stock price fell.
Guardant Health purchased the Guardant Health AMEA joint venture for approximately $178 million.
$178M source β
Guardant Health supported the 2022 launch of the Colon Cancer Coalition's first Survivorship Council, comprising 17 patients, survivors and caregivers affected by colorectal cancer.
AmirAli Talasaz has served on the board of directors since January 2013 and occupied the chairman role until August 2021.
Craig Eagle was named chief medical officer in 2021, succeeding Richard B. Lanman, who joined in 2014 and held the CMO role as of 2017.
Guardant Health leased two levels of the former Hewlett Packard Enterprise headquarters in Palo Alto, reported as the largest Silicon Valley lease of the year to date; the company subsequently moved its corporate headquarters to the approximately 250,000-square-foot space.
The Guardant360 test received U.S. Food and Drug Administration approval in 2020.
Guardant Health launched the early-stage cancer assay called Lunar for academic and biopharmaceutical research.
The company's U.S. initial public offering raised $237.5 million and valued Guardant Health at $3.3 billion. Shares trade on Nasdaq under the ticker GH.
$237.5M source β
A joint venture formed by Guardant Health and SoftBank to expand use of Guardant360 in Africa, Asia and the Middle East launched in 2018.
Medicare began covering the Guardant360 test for select lung cancer patients in 2018, prior to FDA approval.
Guardant Health raised $360 million in a round led by SoftBank Group, with participation from prior investors including Khosla Ventures and Sequoia Capital. Proceeds were earmarked for sequencing the DNA of 1 million cancer patients over five years, an early-detection blood screening test, and a test for residual disease in cancer survivors.
$360M source β
The GuardantOMNI test launched in 2017 and has been used for biopharmaceutical research.
Guardant Health launched Project Lunar, studying hundreds of pre-symptomatic, high-risk people for breast, colorectal, lung, ovarian and pancreatic cancer, in collaboration with UCSF, Samsung Medical Center (Seoul), the University of Colorado and the University of Pennsylvania.
The company began selling its Guardant360 liquid biopsy test to oncologists in 2014.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
Legal entities Β· 1
corporate structureIn the news
Guardant Health Raises $50M for Biopsy Free Cancer Screeningtechcrunch.com Β· Feb 2015βΈResearch sources Β· 8
primary sources listed
- Guardant Healthguardanthealth.com Β· web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Guardant Health do?
- Nasdaq-listed biotechnology company selling blood-based liquid biopsy tests for cancer screening, treatment selection and monitoring.
- Who founded Guardant Health?
- Guardant Health was founded by AmirAli Talasaz, Helmy Eltoukhy in 2011.
- Who are Guardant Health's investors?
- Guardant Health's investors include 8VC, AUTHENTIC VENTURES, Cota Capital, Felicis Ventures, Khosla Ventures, Lightspeed Venture Partners, Lotus Capital, Manta Ray Ventures and 5 more.
- How much funding has Guardant Health raised?
- Guardant Health has disclosed $500M raised across 5 of its 8 known rounds.
- Is Guardant Health publicly traded?
- Yes β Guardant Health trades on NASDAQ under the ticker GH.
- Where is Guardant Health headquartered?
- Guardant Health is headquartered in Redwood City, US.






