Level 1
A trading service consisting of real-time bid/ask quotes for securities trading on the Nasdaq stock market and comparable information for securities quoted in the OTC Bulletin Board Service.

Investopedia Says:
Basically, this just consists of real-time quotes. Also known as Level I.

Related Terms:
Bid/Ask Spread
Level II
Level III
Nasdaq

• Pari-passu
• Paris Club
• Parity
• Parity Bond
• Parity Price
• Parking
• Parking Violation
• Parsonage Allowance
• Partial Redemption
• Partial Release
• Participating Policy
• Participating Preferred Stock
• Participation Rate
• Participatory Notes
• Partnership
• Par Value
• Passive Activity
• Passive Foreign Investment Company (PFIC)
• Passive Foreign Investment Company (PFIC)
• Passive Income
• Passive Investing
• Passive Loss
• Passive Management
• Pass-Through Certificate
• Pass-Through Rate