Greybox Investments
Data sourced from SEC public records (and other sources when available). Refreshed weekly • Updated today.
Client AUMClient assets under management
$139,288,619
Clients
104
Advisors
3
across 2 offices
About
Greybox Investments provides fee-only portfolio management primarily to individual and high-net-worth clients, as well as charitable organizations, other registered investment advisers and corporations, managing roughly $177 million across about 104 client relationships. Services emphasize discretionary wealth management delivered through separately managed accounts, unified managed accounts and custom portfolio solutions rather than a packaged financial planning offering.
The firm’s investment approach is quantitative and multi-factor, building style- and sector-based component equity strategies typically composed of 30–60 holdings and incorporating ADRs, ETFs and GDRs where appropriate. Portfolios are constructed using forward-looking risk and return forecasts, internal and external investment components, tax-efficient rebalancing and optional social equity screening, and the firm also offers custom SMA models to other RIAs on negotiated terms.
What is distinctive about Greybox relative to many peer teams is its explicit absence of standalone financial planning services and its focus on scalable, model-driven portfolio construction and distribution to other advisers. The firm also emphasizes institutional custody relationships, block trading and bespoke account constraints that can produce account-level differences from model performance, a set of operational features less commonly emphasized among similar-sized team firms.
Client services
Expertise
Fee options
$0 - $1,000,000: 0.95% $1,000,001 - $2,500,000: 0.85% $2,500,001+: 0.75%
Account minimum: $500,000 Fee-only: Fee-only basis, monthly in arrears based on assets under management.
Main office
See office2301 Morris Avenue, Suite 105
Birmingham AL 35203
Advisors at this office
2
Offices (2)
Most active in
Alabama · Florida
Also doing business as
Dmc Group, LLC · Greybox Investments
Disclosures
Exclamation point means they have disclosures of this type. Check mark means no disclosures of this type were found.
Business activities & affiliations
Is not active or affiliated with:
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Insurance agent
They sell insurance products and may earn commissions on those sales.
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Broker-dealer / trader
They provide brokerage services and may earn transaction-based compensation in addition to advisory fees.
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Bank
They're affiliated with a bank that may offer its own financial products and services.
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Trust company
They provide trust and estate administration services, typically for separate fees.
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Fund sponsor
They manage or sponsor investment funds and may earn management or performance-based fees if clients invest in them.
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Accountant / CPA / tax prep
They offer tax and accounting services, typically for separate fees.
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Lawyer
They provide legal services, typically billed separately.
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Real estate agent
They facilitate real estate transactions and may earn commissions.
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Other specialized services
They may provide services such as pension consulting or municipal advisory work, typically for separate fees.
Advisors at this firm
Donie C
Series 63, Series 65
Birmingham, AL
Greybox Investments
Donie Carlson is a financial advisor at Greybox Investments with 10 years of industry experience. He holds Series 63 and Series 65 licenses. Carlson has been involved with Albemarle Corporation, Martin Farm, and Rockhouse, LLC, entities related to his family farm, where he participates in operational responsibilities outside of trading hours. Greybox Investments provides portfolio and wealth management services to individual and high-net-worth clients, charitable organizations, and other registered investment advisers. The firm employs a quantitative multi-factor approach combined with fundamental analysis to construct equity strategies and offers customized solutions without using hedge funds or structured products.
Len R
CFA®, Series 63
Ft. Lauderdale, FL
Greybox Investments
Len Rittberg is a CFA® charterholder based in Ft. Lauderdale, FL, with three years of industry experience. He currently works at Greybox Investments, where he has been since 2023. Prior to this, he spent six years at Exos Financial and nine years at Adelante Capital Management. Greybox Investments provides fee-only portfolio management primarily to individual and high-net-worth clients, charitable organizations, other registered investment advisers, and corporations. The firm employs a quantitative, multi-factor investment approach focused on scalable, model-driven portfolio construction and distribution to other advisers, emphasizing discretionary wealth management through separately managed and unified managed accounts.
Kenneth C
CFA®, Series 63
Birmingham, AL
Greybox Investments
Kenneth Carlson is a CFA® charterholder with 10 years of industry experience, currently serving at Greybox Investments in Birmingham, AL. He has worked at DMC Group, LLC since 2015 and maintains active roles in several family-owned businesses, including Albemarle Corporation, Martin Farm, and Rockhouse, LLC, where he contributes to farm operations outside of trading hours. Greybox Investments provides portfolio and wealth management services primarily to individual and high-net-worth clients, as well as charitable organizations and other registered investment advisers, using a quantitative multi-factor investment approach combined with fundamental analysis. The firm offers customized single-sleeve models to other RIAs and focuses on forward-looking risk and return estimates while avoiding hedge funds and structured products.
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