Founder

Arch Canyon Partners, LLC was founded by Adam McArthur, CFA, ASA-BV, ABV, MAFF. Mr. McArthur leads Arch Canyon’s team of analysts and directs the firm’s valuation and litigation support activities.

Mr. McArthur has been valuing business interests, intellectual property, and related assets for more than 20 years. His extensive valuation and litigation support experience spans numerous asset classes and industries.

Credentials

Mr. McArthur is highly credentialed, having earned credentials from every major business valuation credentialing organization in the United States. He currently holds the Chartered Financial Analyst (CFA) designation from the CFA Institute; the Accredited Senior Appraiser (ASA-BV) designation in business valuation from the American Society of Appraisers; the Accredited in Business Valuation (ABV) designation from the American Institute of Certified Public Accountants (AICPA); and the Master Analyst in Financial Forensics (MAFF) designation from the National Association of Certified Valuation Analysts (NACVA).

Court qualifications and testimony

Mr. McArthur has qualified as an expert witness in Los Angeles County, Fresno County, Santa Cruz County, and Riverside County Superior Courts. He has also qualified and testified in the U.S. Bankruptcy Court and the Delaware Court of Chancery. Additionally, he has provided expert witness services via deposition, arbitration, and mediation.

Practice depth — proof points

While every engagement is fact-specific, the firm’s experience includes:

• Nearly a decade of QSBS-related valuations under IRC Section 1202 planning and compliance contexts
• More than 1,000 gift and estate tax valuations
• More than 1,000 discount and fractional interest appraisals

These are not marketing ornaments. They reflect repeated work in the areas counsel and CPAs ask about most: tax appraisals under scrutiny, fractional interests, and the valuation questions that sit underneath sophisticated planning.

Who we work with

Our clients and referral sources typically include estate and tax counsel, litigation counsel, CPAs, trustees and fiduciaries, boards and special committees, and closely held business owners. Engagements range from compliance valuations to courtroom testimony.

Areas of expertise

• Business valuation
• Discount studies (DLOC/DLOM) and fractional interests
• QSBS valuation (§1202)
• Gift & estate tax
• Real estate valuation (including fractional interests)
• ESOP valuation and fairness opinions
• Financial reporting / fair value
• Litigation support and expert testimony
• Transaction opinions (fairness and solvency)
• Intellectual property
• Hard-to-value assets

How we approach engagements

Whether the audience is the IRS, an auditor, a trustee, or a court, the standard is the same: the opinion must be reasoned, supportable, and defensible. We scope carefully, document thoroughly, and communicate in language counsel and CPAs can use with their clients.

Boutique scale is intentional. Complex valuation questions benefit from senior attention, not assembly-line templates. Mr. McArthur directs the firm’s valuation and litigation support activities and leads the analyst team on engagements that demand that level of oversight.

Engage us

If you are counsel or a CPA with a valuation question — tax, transaction, reporting, or dispute — we are ready to discuss scope, timing, and approach. Tell us the purpose, the valuation date, the interest involved, and your timeline. We will respond with a clear view of scope and next steps.

Call 818.449.6300 or email info@archcanyon.com.

Our highly credentialed experts provide well reasoned, supportable, and defensible opinions.