The Same Option Contract Cost $0.55 More at My Broker and It Added Up to $11,000

Two laptops sat open on my kitchen island at 12:15 PM on a Thursday, both logged into different brokers, both showing the same SPX put option, same expiry, same strike, and two different mid quotes eleven cents apart. I was not day trading. I was checking whether my memory of a price was right, outta a nagging feeling I could not name. The feeling had a name by 12:16. It was called execution quality, and I had been paying for it, invisibly, for two years.

the nagging that started it

Nothing was broken, that is the peculiar part. Fills arrived, confirmations matched, statements looked clean. But my option fills invariably read to sit slightly on the wrong side of fair value, a few cents handed away here, a dime there, the way a bar of ice loses weight in a glass of water. Individually negligible. I decided to test it properly because the position I was building, selling weekly options on index products, would run 200 trades a year, and pennies at that frequency are not pennies.

the experiment, thirty trades

I funded a second account at a different broker with $25,000 and for the next six weeks I entered every trade in both, same contract, same side, entered within a minute of each other, and kept whichever fill was better, closing the orphan leg same day. Thirty paired trades. On sells, my old broker's fills averaged $0.55 below the better venue. On buys, $0.48 above. Never once did the old broker win a pair. Not once in thirty attempts. That is not bad luck, that is a payment stream, mine to em.

where the 55 cents actually goes

Options markets are fragmented across sixteen exchanges, and retail orders can be routed anywhere, including to wholesalers who pay for the order flow and monetize the spread. My old broker routed everything to one wholesaler by default, price improvement optional, apparently rare. The new broker routed smartly and showed me the national best bid and offer at the moment of entry on screen, so I could see, before clicking, whether my limit was inside the market. The difference was not a fee, not a commission, nothing printable on a schedule. It was the spread, silently widened, on both ends of every round trip.

the two-year invoice

I reconstructed the damage from statements. Approximately 190 option trades over two years, average 5 contracts on names with $3 to $8 premiums, my estimated give-up of about $0.50 a trade in hidden spread. Call it $95 per round trip of value leaked. Across two years, $11,000, on an account where total commissions over the same period were $1,780. I had audited the visible cost, commissions, obsessively, and never once audited the invisible one, cuz the invisible one never appears on a line. It just makes every entry slightly worse and every exit slightly worse, in the direction of the house.

switching is not enough by itself

Moving accounts fixed routing but the real fix was behavioral, and it cost nothing. Now, before any option order, I look at the consolidated quote, place a limit at or inside the mid, and let it work. If it does not fill in five minutes, I step the limit a nickel toward the market, never a market order, not ever, on anything with a spread wider than a nickel. Market orders in options are an open invitation to be the other side of someone's spread capture. Patience at the mid turned out to be worth more than any routing decision, maybe half the leaked cents come back from the limit discipline alone.

the $95 fill I framed

One paired trade from the experiment deserves its own line. A 20-lot on a mid-month expiry, my old broker filled the sell at $2.10, the new account printed $3.05 on the same contract within forty seconds. That is $19 on one ticket, twenty contracts times ninety-five cents, and I remember sitting back thinking a single trade paid for the entire month of my dual-account experiment. Wren, the ex-desk trader I consult when fills confuse me, looked at the two confirms and said the quiet part, that wholesalers call retail flow uninformative and pay for the privilege of pricing it. Uninformative. My two years of careful strikes and sizing, worth nothing at the moment of execution except as spread fodder. That word did more to change my order entry than any article ever written about fees.

the spreadsheet I run monthly

There is a modest sheet now, one row per trade, columns for mid at entry, my fill, and the difference. Thirty-eight rows since the switch, average slippage from mid, $0.07. Not zero, retail never gets zero in options, but $0.07 against $0.55 is a different sport. Annualized against my trade frequency, the improvement projects to about $9,200 a year, which is more than my entire options premium income in my first selling year, recovered from a leak I could not see and can now measure.

thursday, again

This past Thursday at 12:15, same island, same two open tabs out of habit more than need, I placed a spread order at the mid on the same SPX product and watched it fill in ninety seconds, three cents off mid on one leg, even on the other. I closed both laptops and went back to lunch. The nagging is gone. In its place is a habit, limits at the mid, five minutes, a nickel at a time, and a row on a spreadsheet that proves the habit works every month it runs.