Funds

Money Market Fund: Definition

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Simple Definition

A mutual fund that invests in very short-term debt. It is a security held at a brokerage — not a bank deposit, and not FDIC insured.

Why It Matters

Money market funds are widely used for cash sitting in a brokerage account, and they aim to hold a stable value — but aiming is not guaranteeing, and they carry no FDIC insurance. Brokerage accounts have separate SIPC protection, which covers a failed broker rather than a fund losing value. The naming overlap with money market accounts is the single most common source of confusion here.

Key Points

  • An investment held at a brokerage, not a bank deposit.
  • Not FDIC insured — SIPC covers broker failure, not investment losses.
  • Aims for a stable value, but that is an objective rather than a guarantee.

Related Terms

Common Questions

A mutual fund that invests in very short-term debt. It is a security held at a brokerage — not a bank deposit, and not FDIC insured. Money market funds are widely used for cash sitting in a brokerage account, and they aim to hold a stable value — but aiming is not guaranteeing, and they carry no FDIC insurance. Brokerage accounts have separate SIPC protection, which covers a failed broker rather than a fund losing value.

Money market funds are widely used for cash sitting in a brokerage account, and they aim to hold a stable value — but aiming is not guaranteeing, and they carry no FDIC insurance. Brokerage accounts have separate SIPC protection, which covers a failed broker rather than a fund losing value. The naming overlap with money market accounts is the single most common source of confusion here.

An investment held at a brokerage, not a bank deposit.

Not FDIC insured — SIPC covers broker failure, not investment losses.

Aims for a stable value, but that is an objective rather than a guarantee.