A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
o
on margin
on open
on order
on spec
on the close order
on the opening
on-floor order
on-the-run Treasuries
on-the-spot loan
one man picture
one time charge
on the opening
An order to buy or sell a given equity at the opening price. If the transaction cannot occur at this price, the order is cancelled. Also known as at the opening order.