Guardant Health vs Laboratory Corporation of America: why the prices moved differently

Weekly · monthly · quarterly news summaries, side by side in time

Guardant Health Inc (GH)

Q3 202624 Jun – 8 Oct 2026

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Guardant Health Q3 2026: Insurance Win, Strong Revenue, But Competition and Patent Costs Loom

UnitedHealth Coverage for Shield Test UnitedHealth became the first major insurer to cover Guardant's Shield colorectal cancer blood test, expanding access to over 100 million people. This should boost test volumes and revenue as more patients can afford the test.
This is a major new commercial milestone that directly expands the addressable market for a key product.
Strong Q2 Revenue and Raised Guidance Q2 revenue rose 44% to $335 million, beating estimates, and full-year guidance was lifted to $1.34–1.36 billion. This shows accelerating growth and management confidence in the business.
Financial results and guidance are core drivers of investor sentiment and stock price.
FDA and Europe Approve Guardant360 CDx for AstraZeneca Drug The FDA and Europe approved Guardant360 CDx for monitoring AstraZeneca's breast cancer drug, adding repeat-use revenue. This expands the test's clinical utility and creates a recurring revenue stream.
Regulatory approvals open new markets and support long-term revenue growth.
Quest Launches Haystack MRD Nationwide and Patent Ruling Upheld Quest's Haystack MRD test launched nationwide, intensifying competition and potentially pressuring pricing and market share. A court also upheld a $245.2 million patent-infringement ruling plus a 6% royalty on certain sales through 2033, a real cash cost.
These are significant headwinds that could limit growth and profitability, weighing on the stock.

September 202617 Aug – 8 Oct 2026

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Guardant's test approvals expand, but patent ruling adds a cost

FDA clears Guardant360 for breast cancer monitoring The FDA approved Guardant360 CDx as a companion test for AstraZeneca's new breast cancer drug Etcamah. This lets doctors use a simple blood draw every three months to catch treatment resistance early. It adds a new, repeat-use market for Guardant's flagship test, supporting revenue growth.
This is a new regulatory approval that directly expands the market for Guardant's core product.
European approval extends the same breast cancer test Guardant360 CDx received CE-marking in Europe for the same Etcamah companion use. This opens the test to European patients and marks Guardant's 31st companion diagnostic approval. It broadens the addressable market beyond the U.S. and Japan, adding another long-term revenue stream.
This is a new geographic expansion of the same test, increasing the potential patient pool.
Court orders $245 million patent payment A U.S. court upheld a jury verdict that Guardant infringed DNA sequencing patents, ordering $245.2 million in damages and royalties, plus a continuing 6% royalty on certain sales until 2033. Guardant plans to appeal. This is a real cash cost and a drag on future profits, though the appeal could reduce it.
This is a new legal ruling with a concrete financial impact that weighs on earnings and sentiment.
Strong revenue growth beats peers Guardant reported quarterly revenue of $335 million, up 44.3% from a year earlier, beating analyst estimates by 6.4% — the biggest beat and fastest growth among testing and diagnostics peers. It also raised full-year guidance the most. This shows the business is scaling quickly and winning share.
This is new financial data showing accelerating demand and execution, a core driver of the stock's value.

Latest17 Aug – 8 Oct 2026

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Guardant's test approvals expand, but patent ruling adds a cost

FDA clears Guardant360 for breast cancer monitoring The FDA approved Guardant360 CDx as a companion test for AstraZeneca's new breast cancer drug Etcamah. This lets doctors use a simple blood draw every three months to catch treatment resistance early. It adds a new, repeat-use market for Guardant's flagship test, supporting revenue growth.
This is a new regulatory approval that directly expands the market for Guardant's core product.
European approval extends the same breast cancer test Guardant360 CDx received CE-marking in Europe for the same Etcamah companion use. This opens the test to European patients and marks Guardant's 31st companion diagnostic approval. It broadens the addressable market beyond the U.S. and Japan, adding another long-term revenue stream.
This is a new geographic expansion of the same test, increasing the potential patient pool.
Court orders $245 million patent payment A U.S. court upheld a jury verdict that Guardant infringed DNA sequencing patents, ordering $245.2 million in damages and royalties, plus a continuing 6% royalty on certain sales until 2033. Guardant plans to appeal. This is a real cash cost and a drag on future profits, though the appeal could reduce it.
This is a new legal ruling with a concrete financial impact that weighs on earnings and sentiment.
Strong revenue growth beats peers Guardant reported quarterly revenue of $335 million, up 44.3% from a year earlier, beating analyst estimates by 6.4% — the biggest beat and fastest growth among testing and diagnostics peers. It also raised full-year guidance the most. This shows the business is scaling quickly and winning share.
This is new financial data showing accelerating demand and execution, a core driver of the stock's value.

July 202624 Jun – 30 Jul 2026

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Guardant's Shield Wins Insurance Coverage and Sales Surge, Lifting Guidance

UnitedHealth covers Shield blood test UnitedHealth, America's largest commercial insurer, became the first big insurer to cover Guardant's Shield blood test for colorectal cancer screening. Over 100 million people can now get it. More covered patients means more test sales, pushing revenue and the stock up.
This is a major new demand catalyst that directly expands the market for Guardant's key screening product.
Q2 revenue jumps 44%, guidance raised Guardant reported second-quarter revenue of $335 million, up 44% from a year ago, and raised its full-year 2026 revenue outlook to $1.34–$1.36 billion. Oncology test volume grew 63% and Shield screening revenue more than tripled. Strong growth signals the business is scaling, which supports a higher stock price.
This is the latest hard financial evidence of accelerating demand and management confidence, a core driver of the stock.
Quest's Haystack MRD test goes nationwide Quest Diagnostics won New York approval for its Haystack MRD liquid biopsy test, clearing it for use in all 50 states. This puts a large, well-funded competitor directly into cancer monitoring, where Guardant also plays. More competition could pressure Guardant's pricing and market share, a real counterweight.
It is a new competitive threat that could limit Guardant's growth in the cancer-monitoring market.

24 Jun – 30 Jul 2026

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Guardant's Shield Wins Insurance Coverage and Sales Surge, Lifting Guidance

UnitedHealth covers Shield blood test UnitedHealth, America's largest commercial insurer, became the first big insurer to cover Guardant's Shield blood test for colorectal cancer screening. Over 100 million people can now get it. More covered patients means more test sales, pushing revenue and the stock up.
This is a major new demand catalyst that directly expands the market for Guardant's key screening product.
Q2 revenue jumps 44%, guidance raised Guardant reported second-quarter revenue of $335 million, up 44% from a year ago, and raised its full-year 2026 revenue outlook to $1.34–$1.36 billion. Oncology test volume grew 63% and Shield screening revenue more than tripled. Strong growth signals the business is scaling, which supports a higher stock price.
This is the latest hard financial evidence of accelerating demand and management confidence, a core driver of the stock.
Quest's Haystack MRD test goes nationwide Quest Diagnostics won New York approval for its Haystack MRD liquid biopsy test, clearing it for use in all 50 states. This puts a large, well-funded competitor directly into cancer monitoring, where Guardant also plays. More competition could pressure Guardant's pricing and market share, a real counterweight.
It is a new competitive threat that could limit Guardant's growth in the cancer-monitoring market.

Laboratory Corporation of America Holdings (LH)

Q3 202622 Jun – 22 Sep 2026

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Labcorp launches new tests, raises guidance, but Medicare fee cut proposal weighs

New product launches and Medicare coverage Labcorp launched ColoSense, the first FDA-approved at-home RNA colorectal cancer test, gained Medicare coverage for NASHnext, and introduced the first FDA-cleared Alzheimer's blood test. These expand its testing menu and open new revenue streams.
These launches are new in Q3 and show innovation driving growth.
Strong financial performance and raised guidance Labcorp beat Q2 estimates, raised its 2026 guidance, completed a large buyback, and set long-term revenue growth targets of 5%–8%. This signals confidence in its business and returns cash to shareholders.
These are new financial updates that positively influenced investor sentiment.
Proposed Medicare lab fee cuts CMS proposed cutting Medicare lab fees by up to 15% starting January 2027, citing overpayment versus private insurers. This sharply pressured Labcorp and Quest shares, raising concerns about future margins and revenue.
This is a new regulatory threat that negatively impacted the stock.
Reaffirmed outlook despite reimbursement pressure Labcorp reaffirmed its 2026–2029 outlook, saying it already assumed reimbursement pressure. However, the stock still fell about 3% in Q3, reflecting investor caution over potential margin and revenue risks.
This shows the counterweight: management confidence versus market skepticism.

September 202628 Aug – 22 Sep 2026

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New Alzheimer's Test and Growth Plan Meet Medicare Fee Cut Threat

First FDA-cleared single-biomarker Alzheimer's blood test Labcorp launched the first FDA-cleared single-biomarker Alzheimer's blood test, a simple blood draw that could replace costly PET scans. It also allied with the largest US primary care network to drive routine orders, supporting future test volume and revenue.
New product and partnership that can lift future demand and revenue.
Investor Day reaffirms 2026 guidance and sets 5%-8% growth target Labcorp reaffirmed 2026 adjusted EPS guidance above Wall Street estimates and set long-term targets of 5%-8% annual revenue growth and 8.5%-11.5% EPS growth through 2029. The plan includes margin expansion and AI/robotics, giving investors a clearer growth path.
Directly supports earnings expectations and long-term valuation.
CMS proposes up to 15% cut in Medicare lab fees CMS proposed cutting Medicare lab payments by up to 15% starting January 2027, saying Medicare pays 16% more than private insurers. Labcorp and Quest shares fell sharply. If finalized, this would lower reimbursement for routine tests and pressure revenue and margins.
A major regulatory threat that directly reduces future payments.
Labcorp says CMS cuts won't change 2026-2029 outlook Labcorp reaffirmed its 2026-2029 growth targets despite the proposed Medicare cuts, saying it already accounted for continued reimbursement pressure. It warned the cuts could hurt patient access and backs the RESULTS Act. The stock still fell about 3%, showing investors remain cautious.
Company response to the cut is key to whether the negative is already priced in.

Latest28 Aug – 22 Sep 2026

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New Alzheimer's Test and Growth Plan Meet Medicare Fee Cut Threat

First FDA-cleared single-biomarker Alzheimer's blood test Labcorp launched the first FDA-cleared single-biomarker Alzheimer's blood test, a simple blood draw that could replace costly PET scans. It also allied with the largest US primary care network to drive routine orders, supporting future test volume and revenue.
New product and partnership that can lift future demand and revenue.
Investor Day reaffirms 2026 guidance and sets 5%-8% growth target Labcorp reaffirmed 2026 adjusted EPS guidance above Wall Street estimates and set long-term targets of 5%-8% annual revenue growth and 8.5%-11.5% EPS growth through 2029. The plan includes margin expansion and AI/robotics, giving investors a clearer growth path.
Directly supports earnings expectations and long-term valuation.
CMS proposes up to 15% cut in Medicare lab fees CMS proposed cutting Medicare lab payments by up to 15% starting January 2027, saying Medicare pays 16% more than private insurers. Labcorp and Quest shares fell sharply. If finalized, this would lower reimbursement for routine tests and pressure revenue and margins.
A major regulatory threat that directly reduces future payments.
Labcorp says CMS cuts won't change 2026-2029 outlook Labcorp reaffirmed its 2026-2029 growth targets despite the proposed Medicare cuts, saying it already accounted for continued reimbursement pressure. It warned the cuts could hurt patient access and backs the RESULTS Act. The stock still fell about 3%, showing investors remain cautious.
Company response to the cut is key to whether the negative is already priced in.

July 202622 Jun – 12 Aug 2026

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Labcorp's new tests and raised guidance drive positive outlook

New at-home colorectal cancer test Labcorp launched ColoSense, the first FDA-approved RNA-based at-home colorectal cancer screening test, now covered by Medicare. This expands its test menu and could add recurring revenue from a large screening market.
New product launch with Medicare coverage directly supports future revenue growth.
Medicare coverage for NASHnext liver test Medicare will cover and reimburse Labcorp's NASHnext blood test for liver disease starting August 2026, at about $252 per test. This should boost test volume and create a new recurring revenue stream.
New reimbursement approval expands market access and revenue potential.
Raised profit forecast on strong testing demand Labcorp beat Q2 estimates and raised its 2026 earnings and revenue guidance, driven by steady diagnostic testing and growth in drug-development services. This signals management confidence and supports a higher stock price.
Upgraded guidance and earnings beat are key positive catalysts for the stock.
Expanded oncology testing and buyback Labcorp launched the first FDA-approved PTEN companion diagnostic for prostate cancer and completed a large share buyback. These moves strengthen its precision oncology position and return cash to shareholders, supporting the stock.
New oncology test and buyback completion reinforce growth and shareholder value.

22 Jun – 12 Aug 2026

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Labcorp's new tests and raised guidance drive positive outlook

New at-home colorectal cancer test Labcorp launched ColoSense, the first FDA-approved RNA-based at-home colorectal cancer screening test, now covered by Medicare. This expands its test menu and could add recurring revenue from a large screening market.
New product launch with Medicare coverage directly supports future revenue growth.
Medicare coverage for NASHnext liver test Medicare will cover and reimburse Labcorp's NASHnext blood test for liver disease starting August 2026, at about $252 per test. This should boost test volume and create a new recurring revenue stream.
New reimbursement approval expands market access and revenue potential.
Raised profit forecast on strong testing demand Labcorp beat Q2 estimates and raised its 2026 earnings and revenue guidance, driven by steady diagnostic testing and growth in drug-development services. This signals management confidence and supports a higher stock price.
Upgraded guidance and earnings beat are key positive catalysts for the stock.
Expanded oncology testing and buyback Labcorp launched the first FDA-approved PTEN companion diagnostic for prostate cancer and completed a large share buyback. These moves strengthen its precision oncology position and return cash to shareholders, supporting the stock.
New oncology test and buyback completion reinforce growth and shareholder value.