Actually I was referring to BVG, if it's the occupational pension fund:
(found this from http://www.binational.ch/en/fragen/sozial.html )

Occupational pension fund
From the age of 18 and a gross income of currently CHF 25,320.00, all employees have to pay obligatory contributions to the pension fund. Employers have to pay at least half of these contributions. When an employee changes jobs, the saved money is transferred to the pension insurance of the new employer. Insurance contribution gaps arise if a person in part-time gainful employment does not earn the minimum required annual wages or if a person was older when s/he started work and has not worked for the complete insurance period. The paid-in amounts are reserved for old-age pensions.
Exceptions: The accumulated contributions from employers and employees (capital payment) will only be paid out in the case of definitive emigration to a non-EU/EFTA country, becoming self-employed or purchasing a home.