Liquidity Pillar: The Hidden Tax Destroying Your Trades

The Hidden Tax Nobody Talks About

You found a great setup. The VALUE is there. The SENTIMENT is bullish.

You buy calls. The stock moves in your favor.

But when you try to exit... you realize you're down 15% even though the stock went up.

What happened?

You traded an illiquid option. The bid-ask spread ate your profit.

This is the hidden tax that destroys retail traders — and most platforms don't even show you the data to avoid it.

Why Liquidity Matters More Than You Think

The bid-ask spread is the price you pay to enter AND exit a trade.

Let's do the math on UNP:

• ATM Spread: 11.51%
• You buy at the ask, sell at the bid
• Round-trip cost: ~11.51% just in spread
• Add slippage for larger orders: another 5-10%

That means you need UNP to move 15-20% just to break even.

This is why professionals obsess over liquidity. It's not glamorous. But it's the difference between making money and donating it to market makers.

The 4 Components of Options Liquidity

Most traders only look at volume. That's a mistake.

Real liquidity comes from four factors:

1. Bid-Ask Spread

The tighter the spread, the less you lose on entry/exit.

Spread	Quality	Impact
<1%	Excellent	Minimal cost
1-2%	Good	Acceptable
2-5%	Moderate	Use limit orders
5-10%	Poor	Significant drag
>10%	Very Poor	Avoid or size down

UNP: 11.51% — Very wide. Difficult execution.

2. Open Interest (OI)

More open contracts = more counterparties = easier fills.

OI	Quality
>1M	Excellent
100K-1M	Good
10K-100K	Moderate
<10K	Thin

UNP: 93K — Adequate, but not deep.

3. Daily Volume

Higher volume = more activity = better price discovery.

Volume	Quality
>500K	Excellent
100K-500K	Good
10K-100K	Moderate
<10K	Thin

UNP: 6.1K — Low daily activity.

4. Order Book Depth

How many contracts sit at the bid/ask? Thin books mean slippage on larger orders.

UNP: 130 bid / 101 ask — Adequate for small orders, problematic for size.

Real Example: UNP

Let's look at Union Pacific (UNP) using Options Pilot:

LIQUIDITY Score: 46/100 — Poor. Wide spreads, be careful.

Here's what the 8 Risk Checks tell us:

Check	Threshold	UNP	Status
Tradeable Spread	≤5.0%	11.5%	Wide
Adequate OI	≥10,000	92,999	Deep
Active Volume	≥500/day	6,123	Active
Reasonable Cost	≤$0.50	$0.58	Expensive
Strike Coverage	≥5 strikes	10 liquid	Good
Sector Relative	≤40%	50%	Neutral vs sector
Order Book Depth	≥100 contracts	230	Adequate
Execution Quality	<1.0%	5.00%	Poor

Only 4 of 8 checks passed.

Translation: UNP has enough open interest and volume to trade, but the wide spreads make execution expensive. Every trade starts at a disadvantage.

The Spread Analysis: Where It Gets Expensive

Spreads by Delta (Moneyness)

Delta Range	Spread	Cost to Cross	Grade
40-60 (ATM)	11.51%	$0.10	D
25-40	17.27%	$0.12	D
10-25	28.77%	$0.15	D
<10 (Deep OTM)	57.55%	$0.08	D

The insight: Spreads widen dramatically as you move away from ATM. Deep OTM options have 57% spreads — essentially untradeable.

Slippage by Order Size

Order Size	Est. Slippage	Execution Risk
1-10 contracts	~5.75%	Low
11-50 contracts	~9.21%	Moderate
51-100 contracts	~17.27%	Moderate
100+ contracts	~34.53%	High

The math is brutal: If you try to trade 100 contracts, expect 17-35% slippage on top of the spread.

Strategy Execution Cost

Strategy	Legs	Spread Cost
Single-leg (calls/puts)	1	1x spread
Vertical spreads	2	2x spread
Iron Condors	4	4x spread

Warning: Wide spreads make multi-leg strategies expensive.

With UNP's 11.51% ATM spread:

• Vertical spread: ~23% round-trip cost
• Iron Condor: ~46% round-trip cost

At that cost, the strategy needs to be nearly perfect to profit.

Best Execution Times

Trade during: 10:00-11:30 AM, 2:00-3:30 PM

Avoid: First 15 minutes, Last 15 minutes (widest spreads, most volatile)

The Simple Framework

Here's how to use LIQUIDITY in your trading:

LIQUIDITY Score	Spread Quality	What To Do
80-100	Excellent (<1%)	Trade freely, market orders OK
60-79	Good (1-2%)	Normal trading, limit orders preferred
40-59	Moderate (2-5%)	Use limit orders, be patient
20-39	Poor (5-10%)	Size down, wide limits, or avoid
0-19	Illiquid (>10%)	Experienced traders only

UNP at 46? Poor liquidity. If you must trade, use limit orders and expect slippage. Better yet, find a more liquid alternative.

Why Poor Liquidity Equals Poor Trades

Here's what happens when you ignore liquidity:

Scenario: You're right on direction, wrong on execution

1. You buy UNP calls at $2.00 (the ask)
2. The stock moves 3% in your favor
3. Your calls are now worth $2.20 theoretically
4. But the bid is only $1.90 (11.5% spread)
5. You sell at $1.90
6. Result: -5% loss despite being right

This happens every day to traders who don't check liquidity first.

What Good Liquidity Looks Like

For comparison, here's what a LIQUIDITY score of 80+ looks like:

• ATM Spread: <1% (not 11.5%)
• Daily Volume: 100K+ (not 6K)
• OI: 500K+ (not 93K)
• Slippage: <1% for 100 contracts (not 17%)

Stocks like AAPL, SPY, QQQ, NVDA have this kind of liquidity. UNP doesn't.

The Liquidity Checklist

Before every options trade, ask:

1. What's the ATM spread? (>5% = caution, >10% = avoid)
2. What's the daily volume? (<10K = thin)
3. What's the OI? (<10K = limited counterparties)
4. How does slippage scale? (Check execution guidance)
5. Is my strategy multi-leg? (Multiply spread cost by legs)

If liquidity fails these checks, either:

• Find a more liquid alternative
• Size down significantly
• Use very wide limit orders and be patient
• Skip the trade entirely

Get the Full Picture

LIQUIDITY is one of five pillars we analyze:

• VALUE — Are options cheap or expensive?
• SENTIMENT — What are traders betting?
• ACTIVITY — Is something unusual happening?
• LIQUIDITY — Can you trade efficiently?
• TIMING — Is now the right moment?

We score 4,000+ stocks across all five pillars. Every trading day.