Lower Middle Market Portfolio

American Sensor Technologies, Inc. designs, develops, manufactures and markets state-of-the-art, high performance commercial and industrial sensors.

AmeriTech College Operations, LLC is a private, for-profit college providing nursing and healthcare degrees and diplomas through two traditional campuses near Salt Lake City and specialized online programs.

Audio Messaging Solutions provides outsourced solutions for its customers' telephone on-hold messaging requirements through a subscription-based revenue model.

B.J. Alan Company is an industry leading retailer and distributor of consumer fireworks and operator of fireworks showrooms and retail locations across the U.S. under the "Phantom Fireworks" brand name.

Bond-Coat, Inc. provides external casing and tubing coatings for corrosion prevention and cement adhesion to customers in the upstream oil & gas industry.

Bridge Capital Solutions Corporation ("Bridge Capital") is a financial services firm that provides accelerated cash flow solutions to small businesses.

Cafe Brazil, LLC owns and operates nine full service restaurant/coffee houses in the Dallas/Fort Worth Metroplex. Cafe Brazil also operates a wholesale bakery production facility which provides fresh baked goods to each of its restaurants.

California Healthcare Medical Billing, Inc. provides outsourced billing, revenue cycle management, business services, IT and Electronic Health Record (EHR) technology to physician practices and clinics.

CBT Nuggets, LLC produces and sells original content IT certification training videos. CBT Nuggets, LLC's training videos provide comprehensive training for certification exams from Microsoft, CompTIA, Cisco, Citrix and many other professional certification vendors.

Ceres Management, LLC, d/b/a Lamb's Tire and Automotive Centers, is a leading operator of Goodyear tire retail and automotive repair centers in and around Austin, Texas, with fifteen operating locations.

Compact Power Equipment Centers, LLC is a light to medium duty equipment rental operation that owns and operates outdoor equipment rental locations.

Condit Exhibits, LLC is a Denver, Colorado based designer, manufacturer and manager of trade show exhibits and permanent displays.

Drilling Info Inc. is the premier web-based information service for the domestic upstream oil and gas industry, providing an integrated land, production, and well information analysis platform.

Gulf Manufacturing, LLC manufactures, modifies, and distributes specialty flanges, fittings, rings, plates, spacers, and other fabricated metal products utilized primarily in piping applications.

Harrison Hydra-Gen, Ltd. is a Houston, Texas based manufacturer of mobile hydraulic-driven generators for the fire apparatus, oilfield service and aerial work platform markets.

Hawthorne Customs & Dispatch Services, LLC provides "one stop" logistics services to its customers in order to facilitate the import and export of various products to and from the United States.

Hayden Acquisition, LLC is a leading manufacturer and supplier of precast concrete underground utility structures to the construction industry.

Houston Plating & Coatings, LLC is a provider of nickel plating and industrial coating services primarily serving the oil field services industry.

Hydratec Holdings, LLC is engaged in the design, sale and installation of agricultural micro-irrigation products/systems to farmers in the San Joaquin valley in central California.

Indianapolis Aviation Partners, LLC operates a Fixed Base Operation ("FBO") located at the Indianapolis International Airport under the "Million Air" brand name.

Indianhead Pipeline Services, LLC is a Wisconsin-based provider of products and support services to transcontinental pipeline construction companies.

Integrated Printing Solutions, LLC was founded in 1997 and is a premier provider and innovator of print, data programming and management and specialty marketing strategies.

irth Solutions, Inc. is a leading provider of asset management solutions to the utility and energy industries.

Jensen Jewelers of Idaho, LLC is the largest privately owned jewelry chain in the Rocky Mountains with 15 stores in 5 states, including Idaho, Montana, Nevada, South Dakota and Wyoming.

KBK Industries, LLC is a manufacturer of standard and customized fiberglass tanks and related products primarily for use in oil and gas production, chemical production and agriculture applications.

Lighting Unlimited, LLC, originally founded in 1982, is a leading provider of commercial and residential lighting products and design services in the Houston, Texas market.

Marine Shelters Holdings, LLC, d/b/a LoneStar Marine Shelters, is a specialty fabrication company that constructs large living quarters and auxiliary buildings primarily for deep-water drilling and production rigs.

Mid-Columbia Lumber Products, LLC is a manufacturer of finger jointed dimensional framing lumber.

The MPI Group/Metal Products, Inc. is an independent, regional manufacturer of custom hollow metal doors, frames and accessories for the architectural hardware industry.

NAPCO Precast, LLC designs, manufactures, transports and erects precast and pre-stressed concrete products primarily for the non-residential/commercial construction industry.

National Cardiovascular Partners was founded to facilitate the formation of outpatient cardiac cath labs, hospital based cardiovascular programs through physician partnerships.

NRP Jones, LLC manufactures hydraulic, industrial, and oilfield hoses, fittings and assemblies for the oil and natural gas drilling, agricultural, transportation, construction, and mining industries.

Olympus Building Services, Inc. provides custodial and facilities support services to numerous large governmental and commercial facilities throughout the United States.

OMi Holdings, Inc. (OMi) designs, manufactures, and installs overhead material handling equipment including bridge cranes, runway systems, monorails, jib cranes and hoists.

OnAsset Intelligence Inc. is a Texas-based leading provider of wireless devices and software solutions focused on helping customers wirelessly locate, track, connect, and manage fixed and mobile assets in real-time.

OPI International, Ltd. provides offshore construction services to large integrated and independent customers within the oil and gas industry.

PCI Holding Company, Inc. is the parent company of Pacific Consolidated Industries LLC ("PCI").

Pegasus Research Group, LLC, dba Televerde provides sales-lead and customer data services to Fortune 500 IT hardware and software companies.

PPL RVs, Inc. is a Houston, Texas based consigner of pre-owned recreational vehicles and online parts retailer.

Principle Environmental, LLCprovides comprehensive noise mitigation solutions including the design and installation of acoustical sound control systems.

Quality Lease and Rental Holdings, LLC. is headquartered in El Campo, Texas and provides drill site services and equipment rentals to the upstream oil & gas industry.

Radial Drilling Services Inc. is a provider of lateral drilling technologies and related services to increase production in mature oil and gas wells through modified coiled tubing technology.

RMB, Inc. and Gault Financial, LLC, two companies under common equity ownership (together, the "Company") are headquartered in Knoxville, Tennessee and provide healthcare revenue cycle management services to customers nationwide.

River Aggregates, LLC supplies sand and gravel products that are utilized in various construction activities, including concrete, asphalt, masonry, utility, landscaping and other applications.

SAMBA Holdings, Inc. is a leading provider of fleet compliance software and services to car and truck fleet owners.

SYNEO designs and manufactures manual, semiautomatic, pneumatic and computer numerically controlled machines and tools used primarily by medical device manufacturers to place access holes in catheters.

Texas ReExcavation, L.C. is a provider of hydro excavation/vacuum excavation services.

Thermal & Mechanical Equipment, LLC is a designer, distributor and representative for manufacturers which specializes in heat transfer.

Uvalco Supply, LLC is a leading provider of farm and ranch supplies to ranch owners and farmers, as well as a leading provider of design, fabrication and erection services for metal buildings throughout South Texas. Uvalco Supply is located in Uvalde, TX.

Van Gilder Insurance Corporation is a full-service regional insurance broker based in Denver, Colorado.

Vision Interests, Inc. is a full service sign company that designs, manufactures, installs and services interior and exterior signage for a wide range of customers.

Walden Smokey Point, Inc. is an established leader in a niche sector of the trucking and logistics industry.

Willis Group, LLC is a Houston, Texas based provider of staffing and recruitment services through three specialized brands: Donovan & Watkins, Genuent, and Seis-Stream Global.

Ziegler's New York Pizza Department is a New York-themed pizzeria and Italian restaurant with locations across the Phoenix metro area.

Zilliant, Inc. is an Austin, Texas-based provider of price optimization and margin management solutions for B2B manufacturing, distribution, high-tech, and industrial service companies.

Select Realized Investments

Affinity VideoNet, Inc. is a leading provider of high-definition video conferencing solutions.

All Hose & Specialty, LLC is a leading distributor of industrial hose, high pressure hose, hydraulic hose and other specialty items such as adapters, fittings and couplers primarily to the industrial and oilfield service industries

Currie Technologies is a designer and distributor of hybrid electric bicycles and other light electric vehicles for personal mobility.

East Teak Fine Hardwoods, Inc. is a leading provider of teak lumber, exotic hardwoods and hardwood products.

EMS Pipeline Services, LLC started its operations in 2003 in Houston, Texas.

Enserv, LLC was formed in 2003 to become a leading national provider of environmentally responsible medical waste collection, transportation, treatment and subsequent disposal services for customers in the healthcare and related industries.

Everyones Internet, Ltd. ("EV1") is a Houston, Texas based company that began its operations in 1998 as an internet service provider ("ISP") in the Houston market.

iDriveonline, Inc. developed and provided customer loyalty and retention programs for the automotive industry.

Lauren Engineers & Constructors, Inc. is a leading "design and build" engineering and construction firm.

Merrick Inc., founded in 1989, is a market leader in providing information technologies to mid-stream and upstream energy companies.

National Trench Safety, LLC engages in the rental and sale of underground equipment and trench safety products, including trench shielding, trench shoring, road plates, pipe lasers, pipe plugs and confined space equipment.

Schneider Sales Management, LLC is a leading publisher of proprietary sales training materials and provider of sales-management consulting services for financial institutions.

Support Systems Homes, Inc. operates drug and alcohol rehabilitation centers offering a wide range of substance abuse treatment programs for recovery from addictions.

TA Acquisition Group, LP mines, processes and sells sand and gravel products that are utilized in various construction activities in the Austin, Texas area.

Texas Taxi, Inc. was founded in 2003 to acquire Greater Houston Transportation Company, Greater Austin Transportation Company and Greater San Antonio Transportation Company and several sister companies in the Houston, Austin and San Antonio markets.

Transportation General, Inc. is a provider of transportation and taxi cab services in the greater New Haven, Connecticut market.

Turbine Air Systems, Ltd. is an industry-leading manufacturer of proprietary, packaged, commercial and industrial chilling systems, serving both domestic and international customers.

WorldCall, Inc. is a holding company which owns both regulated and unregulated communications and information service providers.

Historical Investments

Avail Consulting, LLC is a leading provider of business and equipment valuation services, real estate appraisal services, and related financial advisory and consulting services.

Quanta Services, Inc. currently performs projects nationwide and has principal offices in over 25 states.

U.S. Concrete, Inc. began operations through the acquisition of six founding companies with operations in the San Francisco Bay Area, the Sacramento metropolitan area, Washington D.C. and Northern New Jersey.

ADDRESS:

Main Street Capital Corporation
1300 Post Oak Blvd.
Suite 800
Houston, TX 77056

PH. 713 - 350 - 6000
FX. 713 - 350 - 6042
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