Deep ITM LEAPS: Stock Replacement

A deep in-the-money LEAPS call is a long-dated option trading well above its strike price, and active traders hold one as a stock replacement: a single contract stands in for 100 shares at a fraction of the cash. A LEAPS (Long-term Equity AnticiPation Security) is simply an option with more than a year until it expires. "Deep in the money" means the strike sits far below the current stock price, so the option is built mostly of intrinsic value (real, dollar-for-dollar stock value) and carries a high delta. This post follows one real SPY LEAPS call through its deep-ITM life to show what the swap buys and what it costs.

The contract is a SPY $600 call option expiring January 16, 2026. We pick it up in early June 2025, with SPY back above $600 and the call already in the money, and follow it toward expiry.

What stock replacement means

Owning 100 shares of an S&P 500 ETF gives you a dollar of gain for every dollar the fund rises. A deep-ITM call on the same fund does nearly the same thing for far less money down. The link is delta: the amount the option moves per $1 move in the stock. A share has a delta of exactly 1. When a call's delta sits near 0.9, it captures about 90 cents of every dollar the stock adds while tying up a small slice of the cash a share position needs. That gap between exposure and cash is the whole appeal.

Delta climbs toward 1

As SPY pushed further above the $600 strike over the second half of 2025, the call's delta climbed steadily toward a share's:

SELECT toStartOfWeek(date, 1) AS week,
       round(avg(delta), 3) AS delta
FROM global_markets.options_greeks
WHERE ticker = 'O:SPY260116C00600000' AND date BETWEEN '2025-06-02' AND '2026-01-13' AND implied_volatility > 0.02
GROUP BY week ORDER BY week

Delta opened the window at 0.586 in early June and reached 0.962 by mid-January. A delta of 0.962 means the LEAPS moved almost exactly like the stock, near enough one-for-one that a holder felt the same daily profit and loss a shareholder did per dollar of SPY. The full set of sensitivities behind that number are the option greeks.

The capital efficiency

The point of the swap is the cash it frees. Watch the same inputs at three deep-in-the-money dates:

SELECT date,
       round(avg(underlying_close), 2) AS spy_close,
       round(avg(underlying_close) * 100, 0) AS shares_cost,
       round(avg(option_close), 2) AS leaps_price,
       round(avg(option_close) * 100, 0) AS leaps_cost,
       round(avg(underlying_close) / avg(option_close), 1) AS leverage_x,
       round(avg(delta), 3) AS delta
FROM global_markets.options_greeks
WHERE ticker = 'O:SPY260116C00600000' AND date IN ('2025-07-01', '2025-10-09', '2025-12-01') AND implied_volatility > 0.02
GROUP BY date ORDER BY date

In October, with SPY closing at $671.96, one hundred shares cost about $67,200. The LEAPS traded at $82.03 a share, so a single contract on the same 100 shares ran about $8,200: roughly 8.2 times less capital for a position carrying delta 0.897. A trader can hold the SPY exposure and park the other ~$59,000 in cash or Treasuries. The leverage multiple actually shrinks as the call goes deeper, from 12.7 times in July to 8 times in December. A deeper call costs more, so it commands less leverage per dollar even while its delta keeps rising.

Leverage, indexed

Index SPY and the LEAPS to 100 at the start and the amplification is plain:

SELECT week,
       round(spy / first_value(spy) OVER w * 100, 1) AS spy_index,
       round(leaps / first_value(leaps) OVER w * 100, 1) AS leaps_index
FROM (
  SELECT toStartOfWeek(date, 1) AS week,
         avg(underlying_close) AS spy,
         avg(option_close) AS leaps
  FROM global_markets.options_greeks
  WHERE ticker = 'O:SPY260116C00600000' AND date BETWEEN '2025-06-02' AND '2026-01-13' AND implied_volatility > 0.02
  GROUP BY week
)
WINDOW w AS (ORDER BY week)
ORDER BY week

SPY finished the window near 116.6 on that scale, a mid-teens percentage gain. The LEAPS, indexed the same way, reached 265.8, more than a double. One contract turned a mid-teens move in the fund into a triple-digit percentage gain on the premium. This is the same leverage the low cash outlay implies, read as a return rather than a price.

Why the decay stays small

The usual knock on options is time decay. Deep in the money, that worry mostly falls away. Almost all of a deep-ITM premium is intrinsic value, which does not decay; only the thin extrinsic (time) portion erodes as expiry nears.

SELECT toStartOfMonth(date) AS month,
       round(avg((option_close - greatest(underlying_close - 600, 0)) / option_close) * 100, 1) AS extrinsic_pct,
       round(avg(theta), 3) AS theta
FROM global_markets.options_greeks
WHERE ticker = 'O:SPY260116C00600000' AND date BETWEEN '2025-06-02' AND '2026-01-13' AND implied_volatility > 0.02
GROUP BY month ORDER BY month

In early June, with SPY sitting near the $600 strike, 92.7% of the premium was time value. By December, deep in the money, that had thinned to 3.6%: only a few dollars of the $84.49 December premium was decayable time value. Theta, the dollars of value lost per day, ran near -0.106 through most of the hold and only steepened to -0.441 in the final month as the last of the time value drained. A stock-replacement trader closes or rolls the position well before that final-weeks ramp, sidestepping the steep decay entirely. How that curve behaves over an option's life is its own topic: how the greeks change over time.

The trade-offs

The swap is not free. Three costs ride along with it:

1. No dividend. A shareholder collects SPY's quarterly distribution; a call holder does not. Over a long hold that forgone yield is real money.
2. A fixed expiry. Stock never expires; the LEAPS does. Keeping the exposure alive means rolling into a later-dated contract before the option expires, paying a fresh spread each time.
3. A wider spread. Options cost more to enter and exit than the underlying ETF, and a mispriced roll eats into the capital the strategy saves.

Leverage also cuts both ways. The low outlay caps the dollar loss at the premium, yet a sharp drop in SPY shrinks the call faster in percentage terms than the stock moves. The same delta that rewards the upside sharpens the downside. The strategy fits a trader who wants defined-risk, capital-efficient exposure and will actively manage the roll, not a set-and-forget shareholder. The bearish mirror of the idea uses puts instead: see buying and selling put options.

FAQ

What is a deep-ITM LEAPS stock-replacement strategy?

It is holding one long-dated, deep in-the-money call in place of 100 shares of a stock or ETF. The call's delta near 1 makes it track the shares closely while tying up far less cash. Traders use it for leverage without a margin loan, with the loss capped at the premium paid.

How much cheaper is a LEAPS than buying 100 shares?

In this trace, in October the SPY $600 LEAPS cost about 8.2 times less than 100 shares: roughly $8,200 against $67,200 for the same 100-share exposure. The multiple shrinks as the call goes deeper in the money.

Do deep-ITM LEAPS have much time decay?

Very little, until the very end. Deep in the money the premium is mostly intrinsic value, which does not decay. This call carried only 3.6% time value by December, and its theta stayed shallow until the final month before expiry.

What are the downsides of replacing stock with a LEAPS?

Three: no dividend, a fixed expiry that forces a roll, and a wider bid-ask spread than the underlying. Leverage also amplifies losses in percentage terms, though the total loss is still capped at the premium paid.

Every price above is a stored query you can rerun on the Strasmore terminal.