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SALT LAKE CITY — SEO.com, a Utah-based search engine optimization firm, congratulates four of its clients that made the 2011 Inc. 5000. The list ranks the 5,000 fastest-growing U.S. private companies based on revenue growth over four years.

The diverse group of businesses, from a pet store to a clothing manufacturer, was recognized for rapid growth between 2007 and 2010.

“We compliment them,” SEO.com President Ash Buckles said. “We’re proud to be a part of their online marketing strategy.”

The companies included:

BulkReefSupply.com sells products for aquariums.

Del Sol manufacturers clothing and accessories that change color in the sun.

PetStore.com is a website that offers pet supplies.

Spillman Technologies creates software used by emergency dispatchers.

BulkReefSupply.com ranked highest, cracking the list’s top 300. The company, which ranked 258 on the Inc. 5000, experienced explosive growth since 2007. In four years BulkReefSupply.com grew 1,248 percent, according to Inc. magazine.

Founded in 2007, BulkReefSupply.com retails salt water and reef aquarium supplies. The company, which is headquartered in Golden Valley, Minn., was the fifth highest ranked retailer on the list and third highest among companies in the Minneapolis area. Revenue for BulkReefSupply.com, which employs about 16 people, topped $3.9 million in 2010.

BulkReefSupply.com strives to make aquarium supplies as affordable as possible.

Del Sol was ranked on the Inc. 5000 list for the third time. The company moved up to 4,054 in 2011 from 4,769 last year. Between 2007 and 2010 the company grew about 31 percent. Founded in 1994, Del Sol employs about 105 people and is based in Sandy, Utah.

The company manufactures clothing, accessories and toys that change color in the sun. The products are sold in more than 100 stores in about 23 countries.

PetStore.com, which grew about 9 percent since 2007, ranked 4,811 on the Inc. 5000 list. The company’s revenue last year topped $17.7 million, according to Inc. The business was founded in 1997 and employs 45 people. It is based in Garden Grove, California.

The store supplies pet owners via the Internet.

In 2011, Spillman Technologies fell to No. 4,925 on the Inc. 5000. The company, which employs about 205 people, ranked 4,516 in 2010, 4,738 in 2009 and 4,540 in 2008, according to Inc.

From 2007 to 2010 Spillman grew about 5 percent, with revenue exceeding $31.2 million last year. A leading supplier of dispatch software for police and fire departments, Spillman has been in business since 1982. The company is headquartered in Salt Lake City.

About SEO.com

SEO.com is a professional SEO firm that delivers a big ROI for its clients by driving traffic to their websites through aggressive search engine marketing. Clients range from small startups to Fortune 50 companies.