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Humor Rainbow, Inc. operates online dating site. It uses math to get customer dates. The company was founded by Chris Coyne, Sam Yagan, Max Krohn, Nicholas Abramovic and Christian Rudder in 2003 and is headquartered in New York, NY.

Grindr, Inc. engages in the operations of a social networking app. The company is headquartered in West Hollywood, CA.

Ounce of Prevention Fund is a non-profit organization, which provides care and education to children who were born in poverty. It offers childhood education, research, and program models that focus on the physical, social, and emotional development of children from birth to age of five. The company was founded by Irving B. Harris in 1982 and is headquartered in Chicago, IL.

11 Roniin LLC provides business support services. The company was founded by Paul H. Lee in 2014 and is headquartered in Chicago, IL.

Rush University Medical Center engages in the provision of health care services. The company was founded in 1972 and is headquartered in Chicago, IL.

Chicagoland Entrepreneurial Center /Incubator/ (Chicagoland Entr Center) is a venture capital subsidiary of Chicagoland Chamber of Commerce founded in 2012. The firm is headquartered in Chicago, Illinois.

Firestarter Fund (Firestarter Fund) is an Independent Venture Capital firm founded in 2012 by Matthew Moog, Sam Yagan and Brian Hand. The firm is headquartered in Chicago, Illinois.

Part of Elliott Capital Advisors LP, SparkNotes LLC is an American company that operates a platform to assist students in understanding books, writing papers, and studying for tests online. The company was founded by Sam Yagan.

Sparknotes.com provides an academic resource site that features online study guides in a variety of subjects. The company is headquartered in Cambridge, CA.

Chicagoland Entrepreneurial Center provides business development advisory services. It helps clients by providing financing, sales and client development, mentoring, peer-to-peer exchange, grant and new ventures accelerating services. The company was founded in 1999 and is headquartered in Chicago, IL.

LitCharts LLC provides literature guides. Its LitCharts includes a color-coded Themes Key, which assigns a specific color to each theme. Readers can then trace the prevalence of themes throughout the book. The company was founded by Benjamin Florman and Justin Kestler and is headquartered in Brooklyn, NY.

Part of Elliott Capital Advisors LP, Thespark.com, Inc. operates a website that provides content geared towards students and young adults. The company is based in Cambridge, MA. The company was founded by Sam Yagan, Max Krohn, Chris Coyne.

Meetic SAS provides online dating and matchmaking services. It offers online and mobile social networking services and markets complementary economic models. The company was founded by Marc Simoncini on October 30, 2001 and is headquartered in Paris, France.

Excelerate Labs provides investment services. It offers startup capital, mentorship, and consultancy services. The company was founded by Troy Henikoff, Sam Yagan and Nick Rosa and is headquartered in Chicago, IL.

Corazon Group LLC (Corazon Group) is a venture capital firm founded in 2013 by Sam Yagan and Steven M. Farsht. The firm is headquartered in Chicago, Illinois.

Match.com LLC operates online dating sites. In addition to the company's flagship site, the company connects with Web-bound singles through country-specific sites. Registered members can post a personal profile and browse the site in search of a potential match. Match.com is an operating business of IAC/InterActiveCorp. Match.com was founded in April, 1995 and is located in Dallas, TX

SpotHero, Inc. provides mobile applications and website for drivers to find reserve parking spot. The company was founded by Mark Lawrence, Jeremy Smith and Lawrence Kiss in 2011 and is headquartered Chicago, IL.

Tinder, Inc. develops online dating applications. It provides a software that can be connected to social media and can be downloaded to mobile phones. The company was founded by Sean Rad, Justin Mateen, Jonathan Badeen, Christopher Gulczynski, Joe Munozm, and Whitney Wolfe in 2012 and is headquartered in Dallas, TX.

O'Brien Veterinary Management LLC operates veterinary services clinics. Its practice management and consulting services cover all aspects of animal hospital administration including operations, strategy, human resources, purchasing and vendor management, finance and marketing. The company was founded by Emily O’Brien and Gregory M. O'Brien in 2005 and is headquartered in Lake Forest, IL.

Brilliant Worldwide, Inc. provides online software that connects students to discuss and solve mathematics and physics problems. The company was founded by Sam Solomon, Silas Hundt and Suyeon Khim in 2012 and is headquartered in San Francisco, CA.

ShopRunner, Inc. engages in the design, development, and operation of a shopping platform for merchants. The firm offers ShopRunner platform. The company was founded by Michael Golden in 2009 and is headquartered in Chicago, IL.