Limit fills around option fair value

Two clocks for one fill

The archive presents waiting for a pre-chosen price as the usual way to enter, and it judges cheapness or richness against a five-input model. TradersWeek reads that historical workflow as a two-clock execution problem. The first clock is the five-factor premium model that sets the cheap-versus-rich band for the week. The second is a same-session limit fill that decides whether the listed premium lands inside that band.

The editorial lesson is regime-aware fill hygiene, not a new directional signal. In editorial terms, paying through the band is an exception reserved for a discontinuity tape, not the default way to express a view.

How fair value is judged

Theoretical cheapness or richness is judged with a five-input pricing model whose primary input is volatility. Time to expiration, interest rates, the underlying price, and dividend flow are the remaining inputs. Theoretical richness is the point or percent gap between the live premium and that five-factor model value.

Why the fill level is material

Most at-the-money front-month options in the illustrated tape typically span about one to two points inside a single session, so the fill level is material to the trade result.

On a static, range-bound day an option marked fair at 4-1/2 can still print 5, about 11 percent rich, and 4, about 11 percent cheap, before the close. That session is a range-bound premium: a quiet tape in which the option oscillates around fair value rather than trending away from it.

A buyer of the August 255 calls who paid 5 near the session high, rather than 4, would later show a 1-1/4-point loss if the option printed 3-3/4, versus a 1/4-point loss from the lower fill. The higher print fits a premium chase: lifting an offer near the session high instead of waiting for a pre-set limit.

Premium chase versus a limit fill

Waiting for the option to trade down to a pre-chosen price is presented as the usual execution choice. That wait is the limit fill: a resting bid or offer that lets the listed premium trade to a chosen price. Paying through the market is reserved for the uncommon case of a move that would otherwise be missed.

Habitual paying-up versus fair value is framed as surrendering the edge, with 85 percent of such chasers remaining active no longer than 18 months.

A half-dollar premium above the model is not treated as an automatic short. It can reflect elevated near-term rally expectations, while a long at 5 is framed as having weaker odds than a long at 4-1/2 or 3-3/4.

The discontinuity exception

A discontinuity exception is a rare break in the underlying that can justify paying a premium far above the model. Far out-of-the-money puts on a name that later dropped 48 points were modeled at 1/16 yet offered at 1-1/2 with two days to expiration, then opened at 14 and traded 21 after the break.

TradersWeek treats that tape as the uncommon case, not as a reason to make paying through the band the ordinary entry. The archive facts describe the historical workflow. The two-clock reading is editorial and is not attributed to the archive.