Substantially all of our revenues are derived from the sales of cyclodextrins, bio-pharmaceuticals containing cyclodextrins, cyclodextrin complexes, resale of cyclodextrins manufactured by others for our clients to their specifications, and our own licensed cyclodextrin products. We currently sell our products directly to customers in the diagnostics, pharmaceutical, and industrial chemical industries, and to chemical supply distributors. In 2012, we began offering pulse drying services. Since 2017 we transitioned to an outside company to continue our pulse drying services.
Our core business has transitioned to a biotech drug development company from a business which had been primarily reselling basic cyclodextrin products, which have the least value-added attributes. Our strategy going forward is to pursue opportunities in healthcare where cyclodextrin applications have maximum value.
We market and sell bio-pharmaceuticals containing cyclodextrins, and cyclodextrins and related products to the pharmaceutical and other industries. Our revenues are principally from the sales of chemically modified cyclodextrins. For the year ended December 31, 2014, our revenues consisted of 58% biopharmaceuticals, 40% basic natural and chemically modified cyclodextrins, and 2% cyclodextrin complexes represented. Our business strategy is to increase sales by transitioning to the more value-added biopharmaceuticals and complexes and maintaining profitability for these products.
Our cyclodextrin sales historically involve small quantities (i.e., less than 1.0 Kg). We sell directly to our customers, package the orders at our facility and ship using common carriers.
The majority of our revenues are from five to ten customers who have historically been repeat purchasers. In 2014, one customer (UNO Healthcare, Inc.) accounted for more than 57% of our total revenue. In 2013, two customers (UNO Healthcare, Inc. and Sigma-Aldrich Fine Chemical, Inc.) accounted for more than 10% each of our total revenue, and collectively for 60% of our total revenue. Sigma-Aldrich Fine Chemical, Inc. accounts for almost 100% of our annual sales of Aquaplex®. In a year we typically sell to fewer than 200 individual customers.
We anticipate our customer trend to be moving to long-term or sole source contracts with our customers. In 2012, we signed a four-year supplier agreement for Trappsol® HPB with Siemens Corporation. While no longer under contract we continue to supply major companies on an ongoing basis. Our customers buy products from us as needed primarily for product research and development purposes. Therefore, it is difficult to predict future sales, as it is dependent on the current cyclodextrin related research and development activities of others, which we have monitored in the past by following the issuance and applications of patents in the US and elsewhere.