Smoothie Shops:

A smoothie is a thick and creamy beverage made from pureed raw fruit, vegetables, and sometimes dairy products (e.g. milk, yogurt, ice-cream or cottage cheese), typically using a blender. Smoothies may be made using other ingredients, such as water, crushed ice, fruit juice, sweeteners (e.g. honey, sugar, stevia, or syrup), whey powder, plant milk, nuts, nut butter, seeds, tea, chocolate, herbal supplements, or nutritional supplements. A smoothie containing dairy products is similar to a milkshake, though the latter typically contains less fruit and often uses ice cream or frozen yogurt.
Source:  Wikipedia

Example Smoothie Shop Operators:

Smoothie Market Future:
The global smoothie market is presumed to experience a healthy CAGR during the forecast period (2018-2023) owing to the increasing awareness about health benefits, asserts Market Research Future (MRFR). Smoothie is a thick beverage which is usually prepared by blending vegetables and fruits and is rich in fiber, vitamins, and other nutrients. Smoothies made of yogurt or milk offer a good source of probiotics which are responsible for good health and helps to build immunity, repair skin, ensure overall wellbeing, and increase energy level. The smoothie market is expanding in the developed as well as in the emerging markets.
Source:  Market Research Future

More Details on the Smoothie Industry (Food Service and Retail)
Smoothie Shops and Manufacturers (Market Research Future):
A new brand, Thrive!, dedicated to promoting a healthy, on-the-go lifestyle, has recently launched a delicious line of ready-to-blend frozen smoothie cups which has been designed to offer healthy and convenient nutrition for people looking to power up for their daily adventures. The pre-portioned superfood cups feature natural ingredients which are freshly cut and flash frozen and are perfectly proportioned in a single serve cup, ready to blend with your favorite liquid base.
Major Key Players Review:
The noteworthy players operating the global smoothie market are Suja Life LLC (US), Innocent Drinks (UK), MTY Food Group Inc. (Canada), Bolthouse Farms Inc. (US), Jamba Juice Company (US), Boost Juice (Australia), Tropical Smoothie Café (US), Smoothie King (US), Barfresh Food Group (US), and Crussh (Australia).
Segment Analysis:
The global smoothie market has been segmented on the basis of packaging, type, distribution channel, and region.
By mode of type, the global smoothie market has been segmented into vegetable-based, fruit-based, and blends. Among these, the fruit-based smoothie is anticipated to fastest and largest market share owing to the wide variety of fruit-based smoothies available in the global market.
By mode of distribution channel, the global smoothie market has been segmented into store and non-store-based. Among these, the store-based segment has been further sub-segmented into specialty stores, hypermarkets/supermarkets, and others. The store-based channel is considered to exhibit a larger share, with supermarkets/hypermarkets dominating the global market.
Among all the regions, the North American region is considered to dominate the global smoothie market due to the growing health-conscious population in this region. The United States is the major contributor in this region owing to the presence of several key players and a growing number of smoothie bars in the country.