You own one share of Tessel Software, a fictional cloud software company. Its year 3 closing snapshot puts that share at $120. Then a share-sale headline appears. Is your piece of the company about to shrink?
First find the seller. Tessel could be creating new shares, another investor could be reselling old ones, or a lock-up could be ending. Your account can still show one share in all three cases. What matters is whether the total grows and where any sale proceeds go.
Follow the seller and the cash
The buyer in a stock-funded takeover may issue shares to pay the target's owners. A public offering can issue shares to raise cash instead.
A follow-on offering is a public share sale after a company's IPO. It can involve two different sellers:
- Primary share issuance: the company creates and sells new shares. It receives the cash, and the total share count grows.
- Secondary share offering: an existing owner, called a selling shareholder, offers shares they already hold. That owner receives the money; the resale creates no extra shares.
Headlines sometimes call either a “secondary offering.” These organized offerings differ from everyday investor-to-investor trades in the secondary market.
In a US prospectus, the offering document, or its supplement, look for shares offered by the company, any selling shareholders, use of proceeds and the share count after the sale.
A deal can contain both kinds of sale. Then the headline total includes shares that merely change hands. Only the newly issued portion belongs in your dilution calculation.
“May sell up to” describes capacity. “Sold” describes a completed sale. Registering shares for a possible sale puts no cash in the company's bank account.
More shares, a smaller fraction
Tessel ends year 3 with 112.5 million shares outstanding. Use that date's share count for ownership, rather than the period average used for earnings per share.
Suppose it then sells new shares equal to 10% of that total at $120 each, all to new investors. You buy none.
- New shares: 10% × 112.5 million = 11.25 million.
- Total afterward: 112.5 million + 11.25 million = 123.75 million.
- Gross company proceeds: 11.25 million × $120 = $1,350 million, before offering costs.
Your share count stays at one. The total it belongs to grows.
You go from owning 1 out of 112.5 million shares to 1 out of 123.75 million. Together, the old holders retain 112.5 ÷ 123.75 × 100 = 90.91% of the company. New investors own 9.09%. Each bar represents the whole company, divided between those groups.
Your ownership fraction falls by 9.09% relative to where it started, not by ten percentage points. The 10% compares new shares with the old total; your ownership uses the larger new total.
Your slice gets smaller, but the company gets cash. Your existing share also has a claim on that cash. That is why 9.09% less ownership does not mean 9.09% less value.
The sale price, offering costs and how management uses the proceeds help determine what your share is worth after the sale. The ownership calculation gives you no automatic new quote.
A resale leaves the share count unchanged
Change just the seller. Suppose an existing holder resells 11.25 million shares instead of Tessel issuing them. The total stays at 112.5 million, Tessel receives no proceeds from the resale, and your one-share fraction stays unchanged.
The price can still move as investors react to the stock offered for sale or interpret the seller's decision. An unchanged share count does not freeze the quote. Interpreting insider sales takes more than a share count.
When an IPO lock-up expires, a restriction on selling ends. Already-issued shares may become available for sale, but other restrictions can still apply. The expiration itself creates no shares and transfers no cash. Permission to sell is not a sale.
For a completed company sale, the useful cash figure is net proceeds: gross proceeds minus offering costs. That is the amount available for the stated plans. For your unchanged one-share holding, the three notices have different consequences:
| Event | New shares? | Cash recipient | Ownership diluted? |
|---|---|---|---|
| Company issues | Yes | Company | Yes |
| Holder resells | No | Selling holder | No |
| Lock-up expires | No | No cash flow | No |
Optional: check a real financing
On June 11, 2024, US-listed GameStop reported completing a sale of 75 million shares for approximately $2.137 billion in gross proceeds, before commissions and offering expenses.
It used an at-the-market offering, a program that sells shares into the trading market over time at market prices. Its June 7 announcement had described capacity to sell up to 75 million shares. The June 11 announcement confirmed the sale.
Dividing the totals gives $2,137 million ÷ 75 million shares = about $28.49 in average gross proceeds per share.
That is an average across the sales, not a single offer price. It is before costs, and it is not an estimate of the stock's fair value.
This fits the table's first row: new shares, company cash and a smaller ownership fraction for an unchanged holding. GameStop said it planned to use the net proceeds for general corporate purposes, including possible acquisitions and investments. A stated use is a plan, not a result.
A spin-off can also add a stock to your account, by distributing a business you already owned through a parent. Follow what changes in the business as well as the number of shares.
In short
- Selling new shares funds the company; reselling existing shares pays the holder.
- New shares shrink an unchanged holding's ownership fraction; a pure resale does not.
- Cash raised can add value even while your ownership percentage falls.
- A lock-up ending lifts a restriction; it does not create shares or prove anyone sold.