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Who We Are. What We Do.

Adco General is an independent, family owned, regional wholesale insurance broker with national capabilities.

Adco General is the largest independent wholesale insurance broker based in Colorado.  We do not work with the general public, but with insurance agents.  When an agent can’t place a risk with their in house standard markets, they come to us in order to have access to over 60 specialty excess & surplus lines markets from around the world (including Lloyds of London).

Richard Thomas CPCU - Owner & President

Dick has been in the insurance business since 1968.  His first insurance job was with Liberty Mutual in San Francisco from 1968 to 1970.   Dick started at Adco in 1970 after returning to his native city of Denver.  He became a CPCU in 1974.  Dick co-founded the Surplus Lines Association of Colorado in 1982 and was president of the Colorado SLA from 1987 to 1996.  He served on the NAPSLO Board of Directors from 1987 to 1989 and then sat on the Board of Directors for Guaranty National from 1990 to 1998. 

In 1989 Dick got Adco tribunalized at Lloyds of London. After Adco’s founder Ed Willis passed away in 1990, Dick became the sole owner of Adco. He was named Company Person of the Year by PIIAC (Professional Independent Insurance Agents of Colorado) in 1997.  He has been on various company advisory boards, including Capitol Indemnity, Penn America, Guaranty National, and American Western Home.  Dick is a Colorado native and graduated from the University of Colorado.



ADCO ManagementAlex Thomas CPCU, ASLI - COO / Principal

Alex (Dick’s son) is a Colorado native and graduated from the University of Oregon in 1999.   After college, he did an internship at Scottsdale Insurance Company from 1999 to 2000.  Alex moved back to Denver after the internship and went to work at Adco in 2000.

His duties include overseeing Adco's binding authority markets, production mangement, and marketing.   Alex completed his ASLI (Associate in Surplus Lines Insurance) designation in 2003 and then obtained a CPCU in 2006. In 2003, he was named Young Company Representative of the Year by PIIAC. 


Mark Thomas - CFO / Principal

Mark (also Dick’s son) has been in the insurance business since 1999, when he started at Adco as a transportation underwriter.  His duties at Adco now include financial management, human resources, IT, and assisting with marketing efforts.  He is a member of the Young Agents of Colorado (PIIAC) and the AAMGA Under Forty Organization (UFO).  Mark is a Colorado native and graduated from the University of Colorado.


Stacy Beakes- Brokerage SVP

Stacy has been in the insurance industry since 1973 and he started with Adco in 1998.  Stacy oversees Adco's brokerage markets while at the same time working in a production role.   

Stacy was a regional manager and broker for Cravens, Dargen & Co from 1981 to 1986 and Montgomery & Collins from 1986 to 1998.  He was on the board of directors for the Colorado Surplus Lines Association from 1982 to 1989.  Stacy served on the Shand Morahan advisory board from 2004 to 2005 and currently sits on the Markel advisory board.  Stacy is originally from upstate New York and graduated from St. Lawrence University.


Marilyn Mitchell - Accounting AVP

When Marilyn started at Adco in 1970 there were only five employees compared to nearly 30 now.  Other than Dick Thomas, Marilyn has the longest tenure of any Adco employee.  She started out as an accounting assistant and worked her way up to accounting manager.  Marilyn helps Adco's clients with all their accounting needs including premium finance, invoices, audits, monthly statements, surplus lines tax, cancellations and return premiums.  Marilyn was born in Iowa, but has lived in Colorado most of her life.


Troy Simpson - Information Technology (IT) Director

Troy started with Adco in 2008 as our IT Support Tech, coming to us from his previous position at Oracle.  In 2012, he was promoted to IT Director after the retirement of a long term employee who previously held the position. 

Troy has made a number of key improvements to Adco’s systems and technology since arriving at the company.  He continues to help us adapt and thrive in the ever changing IT environment.  Troy is a Colorado native. 

Need a Quote?

First, you need to be a contracted Adco General producer. If you are not, talk to Alex Thomas. If you are already a contracted Adco producer, you can get a quote from us in the following ways:

  1. If you aren’t sure whether we have a market for a risk or if you want to discuss market strategy, give us a call or send us an email before you send the submission in.
  2. When you’re ready to send the submission in, just email or fax it to us and your broker or underwriter will acknowledge your submission the same day. 
  • About ADCO General

    About ADCO General

  • ADCO Management

    ADCO Management

  • How to Get a Quote

    How to Get a Quote

How Adco is Set Up


Our Account Executives have access to over 100 excess and surplus lines insurance markets; all rated at least A- by AM Best.  The two main differences between the insurance carriers we represent is the fact that some give us in house binding authority while others operate only a brokerage basis.  Some of our companies write binding authority and brokerage business.  


Our binding authority companies generally write lower hazard business and more “main street” type accounts.  Adco’s Account Executives have the ability to quote and bind submissions that fit the guidelines provided by the insurance company.  Classes written by our binding authority markets include general liability, lower limit property, package, commercial auto, garage liability, inland marine, and liquor liability. 


If a risk falls outside of our binding authority then your Account Executive will to submit the account to our brokerage markets.  Brokerage companies do not give us binding authority so we must negotiate with the carrier to secure a quote.  The more unique and one of kind accounts are quoted by our brokerage markets. Typical lines of business written by our brokerage companies include general liability, professional liability, directors and officers liability, employment practices liability, excess and umbrella liability, environmental liability, and high value property.

Send your submission to any of our Account Executives and we will get it where it needs to go.  If you have any questions about working with Adco General please contact our VP of Business Development, Alex Thomas at 303-605-2083 or This email address is being protected from spambots. You need JavaScript enabled to view it.



Thank you for your business!

Mission and Values

ADCO Mission Statement:

Adco General is dedicated to continued growth as a leader in the specialty insurance business through the principles of professional performance, integrity, creativity,  education, and outstanding value added service to our markets, producers, and the community.