M.E. Allison & Company Inc. M.E. Allison & Company Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Other >> Investment Banking M.E. Allison & Company Inc. 950 E Basse Rd Floor 2San Antonio, TX 78209 | View on Google Maps (210) 930-4000 Visit Site M. E. Allison & Co., Inc. was founded in San Antonio, Texas in 1946. Today it is the oldest privately owned investment firm in the State of Texas. Member since: 1956 If your business isn't here, please contact our Membership Department at (210) 229-2103 or 2107 for information about joining.