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POCI vs XGN

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Precision Optics Corporation, Inc. Common Stock and Exagen Inc. Common Stock

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Daily close · 2026-10-20

Price return

Both stocks start at 0% on the first shared trading day.

POCI-11.25%
XGN-46.69%
Price return: POCI and XGNHistorical recorded observations on the same scale. Missing metrics leave gaps.-102%-59%-15%28%71%202120222023202420252026

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Split-adjusted closing prices. Dividends are excluded.Year ranges begin January 1 of the end year minus the selected years.
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CONTEXT ATTACHEDPOCI + XGNPrices, financials and SEC filing evidence

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Similarity
28.1%
2 shared / 7 total tags

How similar are their businesses?

The score compares business activities in annual filings released in 2025. Core activities receive four times the weight of material activities. Industries that fewer companies share carry more weight.

HealthcareMedical Devices
How we measure overlap ↗
The businesses behind the score

Industry overlap

Filing-derived business activity overlapCounts of retained positive business classifications. Circle sizes do not encode the counts or the weighted similarity score.POCI only5Shared2XGN only0

POCI only · 5

Shared activities · 2

XGN only · 0

No activities in this group.

Positive activities from the two selected annual filings. Expand each group to view all its activities, or use the complete table below. These are classification sets, not revenue shares. The weighted similarity score also accounts for exposure and how common each activity is.
Show business activity table · 7 rows, 3 columns

Core activities receive full weight; material activities receive one quarter. Select a tag to read the filing evidence.

Business activityPOCIXGN
CoreCore
CoreCore
CoreNot tagged
CoreNot tagged
CoreNot tagged
CoreNot tagged
CoreNot tagged

Healthcare

POCI Core

Annual filing released 2025-09-29 · GPT 6 Luna

We have been manufacturing medical products such as endoscopes and endocouplers since our formation in 1982. In 1985 we introduced a proprietary product line of endocouplers. We also design and manufacture custom optical medical devices to satisfy our customers’ specific requirements, incorporating various optical technologies, servicing a variety of minimally invasive surgical and diagnostic procedures, using both reusable and single-use medical devices. In addition to medical devices, we also manufacture and sell components and assemblies specially designed for defense/aerospace and industrial uses.
Domestic Regulation. We currently develop, manufacture and sell several medical products, the marketing of which is subject to governmental regulation in the United States. Medical devices are regulated in the United States by the Food and Drug Administration, or FDA, and, in some cases, by certain state agencies. The FDA regulates the research, design, testing, manufacture, safety, effectiveness, labeling, promotion and distribution of medical devices in the United States. Generally, medical devices require clearance or approval prior to commercial distribution. Additionally, certain material changes to, and changes in, intended uses of, medical devices are also subject to FDA review and clearance or approval.
Read the annual filing ↗

XGN Core

Annual filing released 2025-03-11 · GPT 6 Luna

Item 1. Business. Overview We are a medical technology company primarily focused on the design, development and commercialization of a next-generation portfolio of innovative testing products under our AVISE® brand, which allow for the differential diagnosis, prognosis and monitoring of complex rheumatic, autoimmune and autoimmune-related disease including, among others, systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA). We believe our strong focus and extensive background in the field of rheumatology, combined with our commitment to exceptional customer service and support, position us well to respond to the needs of rheumatologists, primary care physicians, other specialists, and the patients they serve. Our tests are used in a variety of clinical settings to provide clarity in autoimmune disease decision-making with the goal of improving patients' clinical outcomes.
The TC4d test is patent protected through 2035, representing a proprietary expansion of CB-CAPs, involving a biochemical process wherein complement activation products are measured on T-cells. Our Tests We offer 10 commercialized tests under our AVISE® brand, offering next-generation insights to aid the diagnosis, prognosis and monitoring of autoimmune conditions. Our flagship product, AVISE® CTD, represents approximately 90% of our current annual revenue. AVISE® CTD (Including AVISE® Lupus) Our flagship testing product, AVISE® CTD, is a comprehensive test that aids in distinguishing overlapping symptoms and the differential diagnosis of a wide variety of CTDs and other diseases in one convenient blood draw. These diseases include SLE, RA, Sjögren’s syndrome, APS, other autoimmune-related diseases and other disorders that mimic these diseases, such as fibromyalgia.
Read the annual filing ↗

Medical Devices

POCI Core

Annual filing released 2025-09-29 · GPT 6 Luna

We have been manufacturing medical products such as endoscopes and endocouplers since our formation in 1982. In 1985 we introduced a proprietary product line of endocouplers. We also design and manufacture custom optical medical devices to satisfy our customers’ specific requirements, incorporating various optical technologies, servicing a variety of minimally invasive surgical and diagnostic procedures, using both reusable and single-use medical devices. In addition to medical devices, we also manufacture and sell components and assemblies specially designed for defense/aerospace and industrial uses.
Domestic Regulation. We currently develop, manufacture and sell several medical products, the marketing of which is subject to governmental regulation in the United States. Medical devices are regulated in the United States by the Food and Drug Administration, or FDA, and, in some cases, by certain state agencies. The FDA regulates the research, design, testing, manufacture, safety, effectiveness, labeling, promotion and distribution of medical devices in the United States. Generally, medical devices require clearance or approval prior to commercial distribution. Additionally, certain material changes to, and changes in, intended uses of, medical devices are also subject to FDA review and clearance or approval.
Read the annual filing ↗

XGN Core

Annual filing released 2025-03-11 · GPT 6 Luna

The TC4d test is patent protected through 2035, representing a proprietary expansion of CB-CAPs, involving a biochemical process wherein complement activation products are measured on T-cells. Our Tests We offer 10 commercialized tests under our AVISE® brand, offering next-generation insights to aid the diagnosis, prognosis and monitoring of autoimmune conditions. Our flagship product, AVISE® CTD, represents approximately 90% of our current annual revenue. AVISE® CTD (Including AVISE® Lupus) Our flagship testing product, AVISE® CTD, is a comprehensive test that aids in distinguishing overlapping symptoms and the differential diagnosis of a wide variety of CTDs and other diseases in one convenient blood draw. These diseases include SLE, RA, Sjögren’s syndrome, APS, other autoimmune-related diseases and other disorders that mimic these diseases, such as fibromyalgia.
We perform our tests like AVISE® CTD, AVISE® SLE Prognostic and AVISE® MTX assays in our Vista, California clinical laboratory, and although the performance of such tests is primarily regulated under CLIA, as administered by CMS, as well as by applicable state laws, as described above, the FDA has in recently promulgated regulations asserted its authority over the safety and efficacy of such laboratory developed tests (LDTs), including through pre-market review, and the controls necessary to maintain assay quality. The U.S. Food and Drug Administration (FDA) regulates any diagnostic tests that meet the definition of a medical device, except under specific, narrow circumstances.
Read the annual filing ↗

Aerospace

POCI Core

Annual filing released 2025-09-29 · GPT 6 Luna

We have been a developer and manufacturer of advanced optical instruments since 1982, and we operate primarily in two key market segments: medical devices and advanced defense/aerospace products. Within our proprietary optical and imaging technology, our unique custom designs, expert manufacturing capabilities, and advanced engineering and development capabilities have generated traditional endoscopes and endocouplers, digital imaging endoscopes using CMOS sensor technology, some designed and manufactured for single-use, as well as other, more advanced, custom imaging and illumination products for our customers’ use in minimally invasive surgical procedures.
We have been manufacturing medical products such as endoscopes and endocouplers since our formation in 1982. In 1985 we introduced a proprietary product line of endocouplers. We also design and manufacture custom optical medical devices to satisfy our customers’ specific requirements, incorporating various optical technologies, servicing a variety of minimally invasive surgical and diagnostic procedures, using both reusable and single-use medical devices. In addition to medical devices, we also manufacture and sell components and assemblies specially designed for defense/aerospace and industrial uses.
Read the annual filing ↗

XGN Not tagged

Annual filing released 2025-03-11 · GPT 6 Luna

This activity has no positive tag in the selected filing snapshot.

Read the annual filing ↗

Defense

POCI Core

Annual filing released 2025-09-29 · GPT 6 Luna

We have been a developer and manufacturer of advanced optical instruments since 1982, and we operate primarily in two key market segments: medical devices and advanced defense/aerospace products. Within our proprietary optical and imaging technology, our unique custom designs, expert manufacturing capabilities, and advanced engineering and development capabilities have generated traditional endoscopes and endocouplers, digital imaging endoscopes using CMOS sensor technology, some designed and manufactured for single-use, as well as other, more advanced, custom imaging and illumination products for our customers’ use in minimally invasive surgical procedures.
We design and manufacture components for the defense industry, and import, export and manufacture optical products for the defense industry, some of which is controlled by U.S. regulations. Generally, these regulations require strict control over technical data in documented form and as embodied in products, both within our company and as part of exported shipments. In particular, we maintain a technology control plan, we are ISO certified, and ITAR (International Traffic in Arms Regulations) registered with the U.S. State Department, and we maintain a number of technology assistance agreements with overseas suppliers that have been approved by the U.S. State Department.
Read the annual filing ↗

XGN Not tagged

Annual filing released 2025-03-11 · GPT 6 Luna

This activity has no positive tag in the selected filing snapshot.

Read the annual filing ↗

Hardware

POCI Core

Annual filing released 2025-09-29 · GPT 6 Luna

We have been manufacturing medical products such as endoscopes and endocouplers since our formation in 1982. In 1985 we introduced a proprietary product line of endocouplers. We also design and manufacture custom optical medical devices to satisfy our customers’ specific requirements, incorporating various optical technologies, servicing a variety of minimally invasive surgical and diagnostic procedures, using both reusable and single-use medical devices. In addition to medical devices, we also manufacture and sell components and assemblies specially designed for defense/aerospace and industrial uses.
Notes to Financial Statements (1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (a) Nature of Business Precision Optics Corporation, Inc. (the “Company”) designs, develops, manufactures and sells specialized optical and illumination systems and related components. The Company conducts business in one industry segment only and its customers are primarily domestic. The Company performs advanced optical and illumination system design, development, assembly and manufacturing services, and sources for resale specialized optical components for products that fall into two principal areas: (i) medical products for use by hospitals and physicians; and (ii) products used by defense contractors, aerospace and industrial customers. (b) Revenues
Read the annual filing ↗

XGN Not tagged

Annual filing released 2025-03-11 · GPT 6 Luna

This activity has no positive tag in the selected filing snapshot.

Read the annual filing ↗

Manufacturing

POCI Core

Annual filing released 2025-09-29 · GPT 6 Luna

To support these two critical market categories, our business operations are conducted in four areas: systems manufacturing, engineering and product development, Ross Optical components and assemblies, and our micro-optics laboratory. Our systems manufacturing operations assemble and manufacture components and systems for both medical device and advanced aerospace customers who choose to outsource these services based on our ability to handle high complexity components, specific optical technologies, micro-optical assemblies and other advanced manufacturing challenges. Our engineering and product development team assesses specific customer product needs, designs devices to solve those needs, and creates manufacturing processes that enable higher volume production of these devices and assemblies that can then be executed by our manufacturing operations group.
Notes to Financial Statements (1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (a) Nature of Business Precision Optics Corporation, Inc. (the “Company”) designs, develops, manufactures and sells specialized optical and illumination systems and related components. The Company conducts business in one industry segment only and its customers are primarily domestic. The Company performs advanced optical and illumination system design, development, assembly and manufacturing services, and sources for resale specialized optical components for products that fall into two principal areas: (i) medical products for use by hospitals and physicians; and (ii) products used by defense contractors, aerospace and industrial customers. (b) Revenues
Read the annual filing ↗

XGN Not tagged

Annual filing released 2025-03-11 · GPT 6 Luna

This activity has no positive tag in the selected filing snapshot.

Read the annual filing ↗

Technology

POCI Core

Annual filing released 2025-09-29 · GPT 6 Luna

We have been a developer and manufacturer of advanced optical instruments since 1982, and we operate primarily in two key market segments: medical devices and advanced defense/aerospace products. Within our proprietary optical and imaging technology, our unique custom designs, expert manufacturing capabilities, and advanced engineering and development capabilities have generated traditional endoscopes and endocouplers, digital imaging endoscopes using CMOS sensor technology, some designed and manufactured for single-use, as well as other, more advanced, custom imaging and illumination products for our customers’ use in minimally invasive surgical procedures.
Notes to Financial Statements (1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (a) Nature of Business Precision Optics Corporation, Inc. (the “Company”) designs, develops, manufactures and sells specialized optical and illumination systems and related components. The Company conducts business in one industry segment only and its customers are primarily domestic. The Company performs advanced optical and illumination system design, development, assembly and manufacturing services, and sources for resale specialized optical components for products that fall into two principal areas: (i) medical products for use by hospitals and physicians; and (ii) products used by defense contractors, aerospace and industrial customers. (b) Revenues
Read the annual filing ↗

XGN Not tagged

Annual filing released 2025-03-11 · GPT 6 Luna

This activity has no positive tag in the selected filing snapshot.

Read the annual filing ↗
What each company does

Compare the businesses

Precision Optics Corporation, Inc. Common Stock

POCI · XNAS

Precision Optics Corporation, Inc. designs, develops, manufactures, and sells specialized optical and illumination systems and related components primarily in the United States. The company offers medical instrumentation products, including endoscopes and endocouplers, as well as other custom imaging and illumination products, such as Microprecision lenses and micro medical cameras, and 3D endoscopes for use in minimally invasive surgical procedures by hospitals and physicians. It also provides components and assemblies for industrial and military use. It markets its products to medical device companies. Precision Optics Corporation, Inc. was incorporated in 1982 and is based in Gardner, Massachusetts.

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Exagen Inc. Common Stock

XGN · XNAS

Exagen Inc. designs, develops, and commercializes various testing products under the AVISE brand in the United States. The company enables healthcare providers to care for patients through the diagnosis, prognosis, and monitoring of complex rheumatic, and autoimmune and autoimmune-related diseases, including systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA). Its lead testing product is AVISE CTD that enables differential diagnosis for patients presenting with symptoms indicative of various connective tissue diseases (CTDs) and other related diseases with overlapping symptoms. The company offers AVISE Lupus platform, a cornerstone of the SLE assessment that begins by quantifying the level of CB-CAPs biomarkers (EC4d and BC4d) in the patient's blood; and AVISE APS that aids in the diagnosis and management of APS. In addition, it provides AVISE Vasculitis AAV, which utilizes a testing panel of individual analytes to provide physicians with results in the assessment and monitoring of anti-neutrophil cytoplasmic antibody associated vasculitis; AVISE Anti-Histone, a test for autoantibodies to histone proteins; AVISE SLE Prognostic, a panel of autoantibodies for assessing the potential for complications affecting the kidney, brain, and cardiovascular system; and AVISE Anti-CarP, a biomarker-driven RA prognostic test. Further, the company offers AVISE SLE Monitor, a blood test that employs CB-CAPs technology; AVISE MTX, a patented and validated blood test; and AVISE HCQ, a blood test to monitor levels of hydroxychloroquine. It has a research collaboration and license agreement with Allegheny Health Network (AHN) Research Institute to develop T-Cell biomarkers. The company was formerly known as Exagen Diagnostics, Inc. and changed its name to Exagen Inc. in January 2019. Exagen Inc. was incorporated in 2002 and is headquartered in Vista, California.

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Financial data

Fundamentals side by side

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Show fundamentals table · 11 rows, 3 columns
MetricPOCIXGN
ExchangeXNASXNAS
SectorHealthcareHealthcare
IndustryMedical Instruments & SuppliesDiagnostics & Research
Market observation2026-10-202026-10-20
Closing price (USD)$4.26$7.41
Market cap (USD)$46.74M$179.51M
P/E (TTM)UnavailableUnavailable
Latest annual period2026-06-302025-12-31
Revenue (annual, USD)$31.53M$66.58M
Net income (annual, USD)$-3.63M$-19.95M
Gross margin (annual)17.22%58.28%

USD values from stored observations. Fiscal period endings and availability dates may differ.

POCI period ended 2026-06-30 · available 2026-09-28 · SEC filing ↗XGN period ended 2025-12-31 · available 2026-03-10 · SEC filing ↗

Related stock comparisons

Browse all POCI comparisons ↗ · Browse all XGN comparisons ↗

Behind the comparison

Sources and methodology

Price return uses split-adjusted daily closes and excludes dividends. Both stocks start on the first shared trading day within the selected window. Unavailable metrics leave gaps.

Financials use SEC canonical statements available by the displayed cutoff, retaining each company's fiscal period end. Annual and quarterly amounts are shown separately. P/E is unavailable when earnings do not support a positive ratio.

Business overlap uses industry tags from annual filings released in 2025. Each core activity receives full weight; each material activity receives one quarter of that weight. Rarer industries carry more weight. We sum the smaller exposure for each shared activity and divide it by the sum of the larger exposure for every activity in either company. This measures business overlap, rather than price correlation or expected returns.

Search eligibility requires distinct issuers, a shared core category and at least 20% weighted overlap, supported by industry or sector evidence and specific business activities. Broad classifications require stronger overlap within the same sector. Comparisons also need at least 252 shared price observations within two years, recent trading and a common sourced revenue or net-income trend. Missing P/E or gross margin alone does not exclude a comparison. The eligibility snapshot refreshes daily. Related comparisons use a separate, stricter peer rule; their ten-peer discovery limit does not limit search eligibility. Other stock pairs remain available in the comparison tool.

Statements available through 2026-10-22. Industry snapshot: 2025-12-31 · 5,721 classified issuers.

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