IPO (Initial Public Offering) is the process by which a private company sells shares to the public for the first time on a stock exchange. For active traders, the relevant question is rarely whether to invest in the company long-term — it’s how to navigate the volatile, often mispriced price action that unfolds in the days and weeks following the debut.
Key Takeaways
- Retail traders almost never receive IPO allocations at the offering price — the first tradeable price is typically already elevated by institutional demand captured during the roadshow.
- The lock-up expiration date (usually 90–180 days post-IPO, disclosed in the S-1) is a predictable catalyst for insider selling pressure worth tracking in advance.
- A broken IPO — a stock opening below its offering price — is a high-signal bearish indicator; Uber’s broken IPO in May 2019 preceded six months of continued decline.
How an IPO Works
A company preparing to go public files an S-1 registration with the SEC, which discloses financials, risk factors, and the lock-up expiration date. The company then conducts a roadshow, pitching institutional investors to gauge demand and set a final offering price. On IPO day, shares begin trading on NYSE or Nasdaq through an opening auction that determines the first price.
The gap between the offering price and the opening trade is called the IPO pop. Airbnb (ABNB) priced at $68 in December 2020 and opened at $146 — a 115% jump that retail traders could not access. Rivian (RIVN) priced at $78 in November 2021, peaked near $179 within a week, then fell below $15 by 2023. These examples illustrate both the upside retail misses and the downside retail absorbs.
Three mechanics matter most for active traders:
- Opening auction volatility — IPO stocks frequently have wide bid-ask spreads and chaotic first-hour price discovery. Thin order books amplify moves in both directions.
- Lock-up expiration — Insiders are contractually barred from selling for roughly 90–180 days. The expiration date is publicly disclosed in the S-1 filing and functions as a predictable supply event.
- Broken IPOs — When a stock opens below its offering price, it signals that institutional buyers who received allocations are already underwater and likely to sell. This creates sustained downward pressure, not a buy-the-dip opportunity.
Practical Example
On December 10, 2020, ABNB opened at $146 — the offering price of $68 was inaccessible to retail. A trader sets a limit buy at $155 expecting opening momentum, gets filled, and the stock runs to $165 by end of day. They sell for a $10/share gain on 50 shares: $500 profit. The journal entry reads: “entered IPO day 1, wide spreads, stopped out of half at open, held remainder.”
Six months later, the trader has the ABNB lock-up expiration — June 2021 — flagged in their calendar. They short 20 shares at $152, cover at $138 over four days: $280 gain. Journal note: “lock-up expiration sell pressure, 4-day hold.”
Two trades, two IPO-specific mechanics, two logged outcomes. Over time, that log becomes a repeatable edge reference — not a vague memory of “I traded ABNB once.”
An IPO is when a company sells shares to the public for the first time. Retail traders can’t buy at the offering price — only institutions get that. Active traders focus on day-one volatility, lock-up expiration sell-offs, and whether the stock opens strong or broken.
Common Mistakes
- Chasing the IPO pop — Entering at the open on day one without accounting for the spread between the offering price and the opening trade. The pop already happened before retail had access.
- Ignoring the lock-up date — The S-1 discloses the exact lock-up expiration. Failing to note it means getting caught off guard by predictable insider selling.
- Treating a broken IPO as a discount — Uber opened at $42 against a $45 offering price and kept falling. A broken IPO is a sign of weak demand, not a bargain.
- Trading the first 30 minutes without adjusting for spreads — Wide bid-ask spreads on IPO day mean slippage is significantly higher than on established stocks. Position sizing should reflect that cost.
How JournalPlus Tracks IPO Trades
JournalPlus lets traders tag entries with custom labels like “IPO day-1” or “lock-up expiration,” making it straightforward to filter and review all IPO-related trades as a group. The notes field supports logging IPO-specific context — offering price, lock-up date, spread width at entry — so the data is retrievable when the next IPO comes around.
