Castle Biosciences, Inc., a molecular diagnostics company, provides test solutions for the diagnosis and treatment of dermatologic cancers, Barrett's esophagus (BE), uveal melanoma, and mental health conditions. The company offers DecisionDx-Melanoma, a risk stratification gene expression profile (GEP) test that predicts the risk of metastasis for patients with uveal melanoma; DecisionDx-SCC, a risk stratification test for cutaneous squamous cell carcinoma; …
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Competitive advantage assessment
Key strengths
Elite Gross MarginsGross margin quality is top-tier vs peers (score 0.96). This signals strong consumable attach-rate economics.
Strong FCF GenerationFCF margin quality is top-tier vs peers (score 0.73). High FCF conversion confirms strong earnings quality.
Key risks
Revenue Growth SlowingRevenue growth trend is weak (score 0.31). Slowing top-line momentum reduces the future consumable base.
The dashed ring is the peer median. Defense scores are percentile ranks
against peers, so 50 is roughly the typical company in this group.
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Castle Biosciences, Inc. ranks #10 of 62
scored companies in Diagnostics & Research by moat score — the top 16%.
The widest moat in the group is IDEXX Laboratories, Inc. (IDXX)
at 78/100.
Moat scores for companies ranked near CSTL in Diagnostics & Research
How CSTL scores on the Medical Devices & Diagnostics defenses
Pricing Power & Consumable Moat
Score 86
· 25% of the moat score
In MedTech, pricing power is rarely about the machine — it is about what the machine consumes.
R&D Pipeline & Capital Returns
Score 58
· 20% of the moat score
Research spending is how a device company keeps its installed base current, but spending alone proves nothing.
FCF Quality & Cash Conversion
Score 68
· 20% of the moat score
MedTech companies grow by acquisition, and the resulting intangible amortisation depresses reported earnings without consuming any cash.
Commercial Execution
Score 51
· 15% of the moat score
Devices are sold into hospitals and labs through committees, tenders and long qualification cycles, which makes the sales organisation expensive and hard to replicate.
Capital Structure & Resilience
Score 91
· 12% of the moat score
Serial acquirers carry debt, and the question is whether the cash flows underneath it are dependable enough to service it through a downturn.
Growth Durability
Score 45
· 8% of the moat score
Growth durability separates an expanding installed base from a good product cycle.
Castle Biosciences, Inc. (CSTL) scores 69 out of 100 on the StatsAlpha Moat Map, which rates its competitive advantage as moderate. It ranks #10 of 62 scored companies in Diagnostics & Research, the top 16%. The score is a weighted composite of 6 competitive defenses, each measured against industry peers of 61 companies in Diagnostics & Research. Its strongest defense is Capital Structure & Resilience (91/100) and its weakest is Growth Durability (45/100).
How does Castle Biosciences, Inc. compare with other Diagnostics & Research companies?
Castle Biosciences, Inc. ranks #10 of 62 scored companies in Diagnostics & Research by moat score. The widest moat in Diagnostics & Research is IDEXX Laboratories, Inc. (IDXX) at 78/100. The companies ranked closest are Veracyte, Inc. (VCYT) at 70 just above it and Revvity, Inc. (RVTY) at 68 just below it.
How is the moat score calculated?
Each company is scored with an industry-specific template — Medical Devices & Diagnostics in this case, chosen because the defenses that matter to a bank are not the ones that matter to a software company. Every defense combines several financial signals, and each signal is measured as a percentile against a peer group of 61 companies in Diagnostics & Research. The defenses are then weighted to produce the overall score out of 100.
Why is Castle Biosciences, Inc. scored with the Medical Devices & Diagnostics template?
Medical device and diagnostics companies place an instrument once and then sell the consumables, reagents and service that instrument needs for the next decade. The economics are a razor-and-blade model wrapped in regulatory approval and clinician habit, so the MedTech template scores the durability of that installed base rather than the size of any single product launch.
Which competitive defenses are measured for Castle Biosciences, Inc.?
The Medical Devices & Diagnostics template measures 6 defenses, and CSTL scores: Pricing Power & Consumable Moat (86), R&D Pipeline & Capital Returns (58), FCF Quality & Cash Conversion (68), Commercial Execution (51), Capital Structure & Resilience (91), Growth Durability (45). Each is scored independently as a percentile against peers, so a company can be strong on one and weak on another — the overall score reflects how those defenses are weighted for this industry.
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