How to time the IPO lockup expiration cliff.

The mechanics of a lockup, in one paragraph

When a company goes public, the underwriter contractually restricts insiders, employees, and pre-IPO investors from selling for 180 days (sometimes 90, occasionally 270). On expiration day, the supply of tradable shares can multiply by four, five, or ten times overnight. The new equilibrium price is set by whoever absorbs that supply. Most days, that is the marginal long-only fund — and it absorbs it at a discount.

The lockup expiration is not a black-box event. The S-1 filed with the SEC contains the exact share count subject to the lockup, the date of expiration, and the identity of every party with restricted stock. The fully diluted share count is in the 10-Q. The fund vintage of the lead venture investor is in the prospectus. Everything you need to score the cliff is public the day the company files.

Why most retail loses on lockup day

The retail experience of an IPO is the opposite of the institutional experience. Institutions price the deal, allocate to clients, and underwrite or hedge the position. The 180-day lockup is one stop on a structured calendar. Retail buys the stock in the open market after the IPO pop, watches it grind higher for five months, and then takes the lockup-day drawdown personally.

The asymmetry is built into the market. Institutional desks pre-position with put spreads, collar structures, and short-dated downside hedges. Retail platforms often do not even surface the lockup expiration date. The most expensive day of the IPO calendar is, for many holders, an unscheduled surprise.

The float-multiplication math

Float ratio below 20% is the most mechanical of the nine signals. If a company IPOs 50 million of 250 million fully diluted shares, the trading float is 20% — and the lockup expiration adds 200 million tradable shares to the pool overnight. Even if only 10% of those shares change hands in the first month post-unlock, that is twenty million additional shares of supply against a daily volume of perhaps two million. The math does not require sophistication; it requires arithmetic.

The companies most at risk are the ones with the smallest IPO-day floats. Founder-led, VC-heavy, recent-vintage unicorns are exactly the population that lists 8–15% of the cap and then fights gravity for the next five months. Lockup day is when gravity wins.

Why fund vintage matters more than fund identity

Venture capital funds operate on a ten-year clock. Years one through five are deployment. Years six through eight are management. Years eight through ten are distribution — the period in which LPs expect cash back. A fund whose lead investment in the IPO is in year nine of a ten-year life does not have a discretionary view on the lockup. It has a fiduciary obligation to begin distributions, and lockups are often the first window where that becomes possible.

The S-1 lists the fund vintage of every named pre-IPO investor. Sorting that table by fund age and concentration produces a remarkably reliable predictor of lockup-day selling. The selling is not strategic; it is calendar.

What the option market knows three weeks before you do

Equity options on recently-IPOed stocks tend to be thinly traded for the first 60–90 days, then liquefy as institutional hedging activity ramps up. By the time the lockup is 30 days away, the options skew is one of the cleanest leading indicators in equities. Put-call skew widening at the 25-delta strike is dealers pricing the supply they know is coming. A widening of more than five volatility points in the four weeks pre-unlock is consistent with a 60-percent probability of a double-digit drawdown around the unlock window in the historical sample.

If the option market is pricing the cliff, the option market is usually right. The retail mistake is to interpret the put richness as bearish sentiment to fade. It is not sentiment. It is calendar-driven supply being hedged.

The shelf-registration tell

Companies that anticipate a difficult lockup almost always file a shelf registration on Form S-3 ahead of the unlock and arrange a structured secondary offering. The structured secondary is mediated — banks pre-place the supply with institutions at a known price, and the open-market impact is muted. Companies that do not file a shelf and do not arrange a secondary are signaling either confidence or unawareness; in practice, the unmediated unlock produces the largest open-market drawdowns.

The screen is simple: check EDGAR for any S-3 or 424B filings between the IPO date and the lockup expiration. Their absence is a flag, not a signal of strength.

Trading the cliff — three approaches

There is a long-only approach, a hedged approach, and a directional approach. The long-only approach is to wait. If you want to own the company, the equilibrium price after the unlock is almost always lower than the price two weeks before, and a patient buyer is rewarded with a better cost basis.

The hedged approach uses options. A put spread purchased two to four weeks before the unlock at a 5–10% out-of-the-money strike, financed by selling a further-OTM put, is the standard institutional structure. The cost is meaningful but bounded; the protection is direct.

The directional approach is to short into the cliff when six or more of the nine signals align. This requires borrow, and borrow on recent IPOs is expensive — but the historical sample shows that nine-of-nine alignments produce mean drawdowns of 18–24% around the unlock, well in excess of the typical borrow cost. Position sizing is the discipline. The directional approach is not for the cherry-picker.