Raytheon Co., Lexington, Mass., has merged its stock ownership plans and nine 401(k) plans into a single defined contribution plan with $6.8 billion in assets. It also expanded the investment options, increased the employer match and raised employee deferral rates, according to documents it filed in July with the SEC. Fidelity Investments continues as record keeper and administrator of the 401(k) plan, said David Polk, Raytheon manager of media relations. The consolidated 401(k) plan has 14 investment options, up from seven in the major plan before the consolidation. Among the options are several Fidelity funds, three from Vanguard, one from T. Rowe Price and one from Templeton, Mr. Polk said.