IPOs, Offerings & Buybacks

Supply events, lockups, dilution, buybacks. Share count is the trade.

Track 6. Wrappers first: ETF & Index Investing (Course 55). Share-count language sits on statements from Financial Statements for Traders (Course 51) and on multiples from Valuation Ratios (Course 52). Next: Float, Short Interest & Supply (Course 57). Hub: stock courses. Term: IPO.

Share Count Is the Event

Price times shares outstanding is market capitalisation. Change the share count and you change the claim: EPS, P/E, ownership percentage, and often the float that the next course treats as a trading object. An IPO, a follow-on, a selling-shareholder secondary, and a buyback are not four “stories.” They are four ways the supply of the equity changes — cash into the firm, cash out of the firm, or cash that never touches the firm at all.

This course is the operator map for those events: how an IPO is primary supply, not a guaranteed pop; how follow-on and secondary offerings differ on who gets the cash while both can still hit the tape; why lockup length is issuer-specific (TODO:VERIFY in the prospectus — this page will not invent a standard day count); how dilution math actually works; and why a buyback is a share-count event funded by something, not a free lunch. Educational only; not personalized investment advice. No invented IPO-pop averages, lockup calendars, buyback ROIs, or fake SEC URLs.

1. IPO — Primary Supply, Not a Setup

An initial public offering is the firm’s first listed sale of stock to public investors. In the ordinary primary IPO, the company issues new shares and receives the proceeds (minus underwriting spread and expenses). That cash shows up on the balance sheet. Diluted share count steps up. A public float is created — usually a slice of the cap table, not the whole thing. Insiders and pre-IPO holders often remain locked (Section 3). The listed name you can click is not “the whole company became tradeable.”

What the IPO is not:

• Not a guaranteed first-day pop. This page will not invent an average opening premium, a win rate, or a “leave money on the table” statistic. Those tables exist in academic and practitioner literature with their own samples and years. They are not a DennTech backtest and not a reason to market-on-open a name you cannot size.
• Not an allocation you are owed. Institutional books get filled, or not, by the syndicate. A retail fill in the aftermarket is a different price than the offering price. Do not journal the offering price as your entry if you bought the open.
• Not a quiet-period folklore clock you invent. Research and marketing restrictions around offerings are real and rule-specific. Read the deal documents. Do not paste a fake SEC URL or a “banks go silent for N days” rule of thumb as law. TODO:VERIFY the live restriction that applies to the deal in front of you.
• Not automatically a growth story. Course 53 still applies: the statements and the multiple have to agree. An IPO can be a cash-raising event for a firm that is shrinking, cyclical, or already expensive on Course 52 terms.

Tape on day one is an event tape. Spreads are wide, trading halts happen, and pre-market (when it exists for the name) is not a fair-value session. Know the clock on the U.S. stock market session hours 2026 page. A news/event process still binds — news and event-driven equity trading (Course 29) and earnings and catalyst trading (Course 28) are the playbooks for binary prints; an IPO is a supply print, not a free catalyst. Stock Pulse is a pulse, not a new-issue scanner. A stock scanner is coming soon; it is not live.

Underwriting spread, greenshoe / overallotment, and stabilization are deal plumbing. They affect how much stock can still come in the first days and who is leaning on the tape. You do not need a fake “overallotment is always 15%” rule. You need the deal’s prospectus: how many shares primary, how many secondary (selling holders in the IPO itself — common), whether an overallotment option exists, and who can sell when. TODO:VERIFY those lines per deal. This page will not inventory them as a standard.

2. Follow-On and Secondary Supply

After the IPO, the firm (or its holders) can sell more stock. Language is sloppy in the wild, so pin it:

• Follow-on / primary offering — the company issues new shares. Cash hits the issuer. Diluted share count rises. This is equity financing, the same family as the IPO’s primary piece.
• Secondary offering (selling-shareholder) — existing holders sell shares they already own. Cash hits the sellers, not the issuer. Share count of the firm does not increase because of that sale; float often does, because previously untradeable or concentrated stock is now in public hands.
• Mixed / “re-opening” deals — both in one prospectus: some primary, some secondary. Split the cash-flow question. Do not let the headline “secondary” hide a primary slug, or the reverse.

There is no dedicated “secondary offering” glossary slug on this site. Do not invent one. Use IPO for the first listing, and keep follow-on vs selling-shareholder as operator language on this page. Do not invent form numbers or EDGAR shortcuts as if they were DennTech URLs.

Both flavors can still be supply on the tape. A primary deal dilutes the claim and often prices at a discount to the last print to clear. A selling-shareholder deal may not dilute EPS, but it can still overhang the name: more stock looking for a bid, a signal that a large holder wants out, a lockup exception written into the deal. Overnight-announced offerings are event risk; the gap is the product. Size as an event, not as “the company is raising growth capital so it must be bullish.” Growth capital is a use-of-proceeds sentence. The print is a supply sentence. They can both be true. Only one of them sizes the ticket.

ATM (at-the-market) programs dribble primary shares into the tape over time instead of one marketed deal. The dilution is the same algebra (Section 4); the tape impact is slower and easier to miss if you only watch headline “offerings.” Read the share-count footnote in the 10-Q you already use from Course 51. Serial ATM plus stock-based compensation is how a “stable” share count story dies in the diluted-shares line while the price looks calm.

3. Lockups — Issuer-Specific, Not a Standard Clock

A lockup is a contractual restriction (typically in the underwriting agreement and described in the prospectus) that keeps specified holders from selling for a stated period after the deal. It is not a law of nature. It is not a DennTech calendar. This page does not invent a standard lockup length. Some deals are longer, some shorter, some staggered, some with early-release clauses, some with leak-out or 10b5-1 exceptions. TODO:VERIFY the actual dates and the actual holder list in the prospectus of the name in front of you. If you did not read it, you do not have a lockup trade.

When a lockup ends, the potential supply of stock that can hit the public market increases. Whether it does is a holder decision. Treating “unlock day” as a short-the-open rule is folklore. Treating it as a date when float can change — and therefore when Course 57’s float and short-interest objects can change — is operator language. The next course is where you sit with float, short interest, and short-squeeze mechanics. Here, you only need: lockup expiry is a supply option, not a scheduled dump and not a pop.

Early release, staggered unlocks, and “a portion may be sold” language are how people get the date wrong. Journal the document’s date, the holders covered, and whether an exception already let stock out. Do not copy a 180-day meme from a forum into the book. If two sources disagree, the prospectus wins.

4. Dilution Math — Write the Share Count

Dilution, in the equity-trading sense, is the reduction in an existing holder’s claim when new shares are issued. The clean identity:

New ownership fraction = old shares ÷ (old shares + new shares)
Dilution of the old claim = 1 − that fraction = new ÷ (old + new)
EPS (simple) = earnings ÷ diluted shares

Primary issuance increases the denominator. If earnings do not rise by at least as much as the share count, EPS falls. That can still be a good financing if the cash earns more than it cost — that is a use-of-proceeds and return-on-capital question from Course 51, not a reason to skip the share-count line. Selling-shareholder secondaries do not change that denominator by themselves. Stock-based compensation, convertibles, warrants, and ATM drips do, over time. Always read diluted shares, not a marketing “we have a tight float” sentence.

Price reaction is not “dilution percent.” The tape can fall more than 9% because the deal priced at a discount, because the raise signals a cash hole, or because leverage on the name was short-covering into a now-larger float. The tape can fall less, or rally, if the cash removes a going-concern bid. Do not treat the 9.09% as a target. Treat it as the mechanical hit to the per-share claim before the use of proceeds.

5. Buybacks as a Share-Count Event — Not a Free Lunch

A repurchase reduces shares (when shares are retired or held in treasury and excluded from the diluted count you actually use). Mechanically it is the inverse of a primary issuance: cash leaves the firm, the denominator shrinks, EPS can rise even if net income is flat. That last sentence is why buybacks get sold as “per-share value.” It is also why they are not a free lunch. The cash came from somewhere.

Write three questions before you stamp “shareholder friendly” on the name:

1. Authorization vs execution. A board authorization is a ceiling, not a purchase. Actual buybacks print in the cash-flow statement and in the share-count footnote (Course 51). A remaining authorization is optional supply from the company as a buyer, not a bid under the stock.
2. Funding source. Free cash flow after dividends (Course 54’s coverage logic still applies — buybacks plus dividends are the full capital-return load)? Cash pile? New debt? Issuing stock to employees with one hand and buying it back with the other is a round trip, not a shrink. Net dilution = issuances − repurchases. Always net.
3. Price paid versus value. Buying stock above a defensible claim on cash is a transfer to exiting holders funded by remaining holders. This page will not invent a buyback ROI or a “buybacks beat dividends by X%” table. The operator check is: would you size a long at the average repurchase price on the same risk rules?

Signaling is real and overrated. A repurchase can mean management thinks the stock is cheap. It can also mean they have an EPS target, a compensation metric tied to per-share numbers, or a need to offset option dilution. Read the net share count, not the press-release adjective. Open-market programs, tender offers, and ASR (accelerated share repurchase) structures differ in speed and in how much of the float they take in one window. TODO:VERIFY the structure in the 8-K or 10-Q; do not assume “buyback” means a standing bid at last week’s VWAP.

6. How Share Count Changes the Trade

Map the event to the objects you already trade:

Float and short interest are the next course. A thin post-IPO float plus a large short is a different trading problem than a seasoned large-cap with a slow buyback — see short selling and squeeze mechanics (Course 47) for the short side, then Course 57 for the supply stack. Do not diagnose a squeeze from an IPO headline. Do not assume a buyback “covers the shorts.”

Multiples move because the numerator (price) and the denominator (EPS, book, FCF per share) both move. A buyback that lifts EPS 2% does not make a 40× name cheap. A primary raise that cuts EPS 9% does not make a 8× name a trap by itself. Course 52 still owns the multiple. Course 53 still owns the style. This course owns the share-count shock you have to put into those formulas before you trust them.

If you use margin around an offering print, typical equity minimum is about $2,000 to use margin (broker-dependent; house rules may be stricter). Intraday, firms monitor equity versus risk during the session — intraday margin requirements. This page will not teach a 4-day-trade count or a $25,000 day-trading equity floor as current law; that Pattern Day Trader framing is historical only (pattern day trader rule). Size the $10,000 examples, not a relic. Offerings gap; stops are not fill guarantees. Event risk is why Risk Management 101 still sizes the name, not the press release.

EXAMPLE — $10,000 Book, Two Supply Events

EXAMPLE. Illustrative prices, not live quotes, not a recommendation, not a backtest, not an IPO-pop study. Account: $10,000 cash. Risk budget per idea: 1% of equity = $100. Shares always rounded down. Notional cap: 10% of equity = $1,000 per name. Tighter of dollar-risk size and notional cap. No leverage.

Name I (post-IPO, hypothetical). You did not get the offering. Aftermarket price $32.00. You refuse to invent a “typical pop.” Invalidation $28.00 (structure, not a lockup meme). Risk per share = 32.00 − 28.00 = $4.00.

Shares by $100 risk = floor(100 ÷ 4.00) = 25
Notional at 25 × $32.00 = $800 (under the $1,000 cap)
Dollar risk = 25 × 4.00 = $100
Twenty-six shares × $4.00 = $104 — over budget, so you round down.

Binding constraint: the $100 risk budget. The name can still halt, gap through $28, and deliver more than $100 of damage. That is event risk, not a reason to size up because “IPOs run.” Float is small by construction of many new issues; that is a Course 57 input, not a size bonus.

Name B (buyback headline, hypothetical). Price $50.00. Authorization announced; you do not assume execution. Invalidation $47.00. Risk per share = $3.00.

Shares by $100 risk = floor(100 ÷ 3.00) = 33
Notional at 33 × $50.00 = $1,650 — breaks the $1,000 cap
Notional-capped shares = floor(1,000 ÷ 50) = 20
Notional = 20 × 50 = $1,000
Dollar risk = 20 × 3.00 = $60

Binding constraint: the notional cap. The buyback headline did not increase the dollars you are allowed to lose. If you want the indicated EPS lift from Section 5 on this sized position, you do not get it as income; you get a smaller denominator on a name you still have to be right about. Use the risk calculator the same way: live UI is crypto-branded; for stocks treat the unit as shares and round down.

Sanity-check stop distances: (32 − 28) ÷ 32 = 12.50% on I; (50 − 47) ÷ 50 = 6.00% on B. Size I from dollar risk, B from notional. Do not pick a winner. The pedagogical point: supply events change the claim and the tape; they do not change the 1% rule or the round-down.

7. Common Mistakes and Limits

• Treating the IPO as a setup. It is a supply and price-discovery event. No invented pop average makes it a process.
• Confusing follow-on with secondary. Who gets the cash? Does the denominator move? Split mixed deals.
• Inventing a lockup length. Issuer-specific. TODO:VERIFY. A 180-day meme is not a rule on this page.
• Skipping net share count on buybacks. SBC + ATM + “we bought stock” can still be net dilution.
• Treating authorization as execution. The cash-flow statement is the buyback. The press release is a ceiling.
• Calling buybacks a free lunch. Cash left. Funding source and price paid matter. No invented ROI.
• Using dilution percent as a price target. The 9.09% EXAMPLE is the claim, not the print.
• Sizing from the story. In the EXAMPLE, Name B’s 1% math wanted 33 shares; the cap allowed 20. The cap won.
• Inventing SEC URLs or a secondary-offering glossary slug. Not on this site. Use the IPO glossary entry and this course’s language.
• Ignoring halt and gap risk on day-one and overnight deals. Stops are not a fill into a halt.

Limits. Share-count algebra does not time entries. Prospectuses are incomplete if you do not read the exceptions. Buybacks do not put a bid under your stop. IPOs can remain untradable in size. This course is educational — not personalized investment advice, not a deal calendar, and not a claim that any issuance or repurchase outperforms from here. Jurisdiction and account type matter for how you hold a new issue; not tax or legal advice.

Pre-Trade / Research Checklist

1. Event type: IPO / primary follow-on / selling-shareholder secondary / mixed / ATM / buyback authorization / buyback execution. Who gets or spends the cash?
2. Share count: old diluted, new shares (or shares to be retired), net of SBC and other issuance. Write the dilution or shrink percent.
3. EPS and multiple: recompute EPS with the new denominator before you trust P/E (Course 52). Earnings path is a separate assumption — label it.
4. Float: what became tradeable? Lockup: dates and holders from the prospectus, not a forum clock. TODO:VERIFY. Course 57 next.
5. Deal plumbing: overallotment, discount to last print, use of proceeds. No fake form URLs. No standard spread invented here.
6. Buybacks: authorization vs cash actually spent; funding source; net shares. Do not treat the headline as a bid.
7. Tape: session, halt risk, pre-market if any. Event playbooks 28–29. Pulse, not a live scanner.
8. Short/float context if relevant — preview only; full object is Course 57 and Course 47. Do not diagnose a squeeze from a lockup date.
9. Size: $100 risk on a $10,000 book; shares = floor(risk ÷ stop distance); notional cap; round down. Tighter rule wins.
10. Margin plumbing if used: ~$2,000 typical minimum, broker-dependent; intraday margin still applies. Not a $25,000 PDT story.
11. Journal: “This is a ___ supply event; denominator ___ → ___; wrong if price ___; sized to ___ shares.”

FAQ

What is the difference between an IPO and a follow-on?

An IPO is the first public listing. A follow-on (primary) is a later issuance of new shares by a company that is already public. Both typically put cash on the issuer’s balance sheet and raise the diluted share count. A selling-shareholder secondary is a different object: existing stock changes hands, cash goes to the seller, the firm’s share count usually does not rise.

How do I compute dilution?

New ownership of the old book = old shares ÷ (old + new). Dilution of the old claim = new ÷ (old + new). With earnings held fixed, EPS falls by that same fraction. The Section 4 EXAMPLE: 10m new on 100m old → 9.09% dilution and a 9.09% EPS hit. Then, separately, model whether the cash lifts earnings. Do not skip the first step.

How long is a typical lockup?

There is no “typical” this page will invent. Lockups are issuer- and deal-specific, with exceptions and staggered releases. TODO:VERIFY the prospectus in front of you. Expiry is a date when specified holders may sell, not a date they must.

Are buybacks a free lunch for remaining shareholders?

No. Cash leaves the firm. EPS can rise because the denominator fell, even if the business did not earn more. Net of stock-based compensation the share count can still rise. Authorization is not execution. This page will not publish a buyback ROI.

How does share count change how I size the trade?

It does not replace the 1% rule. On $10,000, risk = $100. Shares = floor($100 ÷ dollars to invalidation), then apply the notional cap, round down. Share-count events change the claim, the float, and often the gap risk — they can justify a wider invalidation or a stand-aside, not a larger budget. Use the risk calculator with unit = shares.

Tools for This Course

• Percentage Change Calculator — dilution and EPS change (EXAMPLE: −9.09% on the 10m/100m primary; +2.04% EPS on the $40m buyback); stop distances (12.50% on Name I, 6.00% on B). Dollar inputs, not coins.
• Risk Calculator — dollars of risk to invalidation, then share count. For stocks: shares, round down. Binding cap in the EXAMPLE was dollar risk on I, notional on B.
• Stock Courses Hub · prev: ETF & Index Investing · next: Float, Short Interest & Supply.