A pension fund, also known as a superannuation fund in some countries, is any plan, fund, or scheme which provides retirement income.
Pension funds typically have large amounts of money to invest and are the major investors in listed and private companies. They are especially important to the stock market where large institutional investors dominate. The largest 300 pension funds collectively hold about $6 trillion in assets. In January 2008, The Economist reported that Morgan Stanley estimates that pension funds worldwide hold over US$20 trillion in assets, the largest for any category of investor ahead of mutual funds, insurance companies, currency reserves, sovereign wealth funds, hedge funds, or private equity.
The pension system in Romania is made of three pillars. One is the state pension (Pillar I – Mandatory), the second is a private mandatory pension where the state transfers a percentage of the contribution it collects for the public pension, and the third is an optional private pension (Pillar III – Voluntary).
In addition to the retirement benefit, OYAK pays "disability benefits" to the members on duty when they become partially or fully disabled as well as "death benefits" to the heirs of the deceased member if the death occurs during the member's subscription to the foundation.
OYAK is incorporated as a private entity under its own law subject to Turkish civic and commercial codes. OYAK, while fulfilling its legal duties, as set in the law, also provides its members with social services such as loans, home loans and retirement income systems.
The initial source of OYAK's funds is a compulsory 10 percent levy on the base salary of Turkey's 200,000 serving officers who, together with 25,000 current pensioners, make up OYAK's members.
In the United States, pension funds include schemes which result in a deferral of income by employees, even if retirement income provision isn't the intent. The United States has $19.1 trillion in retirement and pension assets ($9.1 trillion in private funds, $10 trillion in public funds) as of December 31, 2016. The largest 200 pension funds accounted for $4.540 trillion as of September 30, 2009.