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O.A.S.
O.C.C.
O.I.D.
O.P.E.C
Objective (mutual funds)
Odd lot
Odd lot dealer
OEX index
Off-balance-sheet financing
Off-board
Offer
Offer price
Offerings
Offering memorandum
Offer wanted
Off-floor order
Official reserves
Official statement
Official unrequited transfers
Offset
Offshore finance subsidiary
Old-line factoring
Omnibus account
On
On a clean up
On balance
On board
On-floor order
On the money
On the print
On the run
On the take
One man picture
On the tape
One-factor APT
One-way market
Organization of Petroleum Exporting Countries (O.P.E.C.)
Open
Open account
Open book
Open contracts
Open depending on the floor
Open-end fund
Opening transaction
Open interest
Open on the print
Open (good-til-cancelled) order
Open position
Open repo
Open-end fund
Open-end mortgage
Open-market operation
Open-market purchase operation
Open-outcry
Opening
Opening price
Opening purchase
Opening sale
Open up
Operating cash flow
Operating cycle
Operating exposure
Operating profit margin
Operating lease
Operating leverage
Operating risk
Operationally efficient market
Opinion shopping
Opportunity cost of capital
Opportunity costs
Opportunity set
Optimal contract
Optimal portfolio
Optimal redemption provision
Optimization approach to indexing
Option
Option-adjusted spread (O.A.S.)
Option elasticity
Option not to deliver
Option premium
Option price
Options Clearing Company (O.C.C.)
Options contract
Options contract multiple
Option seller
Options on physicals
Option writer
Or better
Order
Ordinary shares
Organized exchange
Original face value
Original issue discount debt (O.I.D. debt)
Original margin
Original maturity
Origination
Other capital
Other current assets
Other long term liabilities
Other sources
Out
Out of print
Out-of-the-money option
Out of the name
Outright rate
Outside market
Outside of you
Outsourcing
Outstanding
Outstanding share capital
Outstanding shares
Out there
Out with
Overage
Overbought
Overbought\oversold indicator
Overfunded pension plan
Overhang
Overlap the market
Overlay strategy
Overnight delivery risk
Overnight repo
Overperform
Overreaction hypothesis
Overreaching
Oversold
Overshooting
Oversubscribed issue
Oversubscription privilege
Over-the-counter (O.T.C.)

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