Final answer:
David Wallace created a company called Saticoy Steel after losing his job at Dunder Mifflin in the television series 'The Office'.
Step-by-step explanation:
The company that David Wallace created after he lost his job is called Saticoy Steel. This is a storyline in the popular television series 'The Office.' David Wallace, the former Chief Financial Officer of Dunder Mifflin, started Saticoy Steel as his venture after being fired from Dunder Mifflin. The other options provided in the question, such as Wuphf.com and Dunder Mifflin 2.0, are not associated with David Wallace's entrepreneurial efforts following his dismissal.