Ticket KPIs · Ticket resale glossary
Stock and Sales Development
Also known as: Development of sales, Development of stock, Stock vs sales chart
Stock and sales development is the pair of time series that shows, for one event, cumulative tickets sold and available tickets over time.
When the sales line climbs while the stock line falls, the event is selling through. When stock jumps up while sales are flat, new inventory has arrived — a restock on the primary market or a wave of new listings on resale.
The point where the stock line approaches zero is the sell-out; the slope of the sales line is sales velocity.
How the sales and stock lines are built
The chart plots two series against time. The sales line is cumulative tickets sold: at each date, every ticket sold up to that point. The stock line is available tickets at that date. On the primary market, where sales are estimated, the two are linked: tickets sold = capacity − available, so one line mirrors the other until capacity changes.
On resale the lines are independent. Sales only go up, but stock rises and falls: change in stock = new tickets listed − tickets sold − tickets withdrawn. Most of the useful information sits in how the two lines move relative to each other.
Worked example: a primary sale with a restock
A 15,000-capacity arena goes on sale. After day one, stock is 4,000 and estimated sales 11,000. Over two weeks stock falls to 1,200, so 13,800 have sold. Then stock jumps to 1,700 overnight: 500 tickets have been added, from released holds or a reconfigured section. Within four days stock is back down to 900.
If sales are estimated as capacity minus available and capacity isn't updated, the restock day appears as 500 tickets “unsold”. Read a dip in an estimated sales line as new inventory, not as refunds — and note how quickly those 500 tickets were absorbed, which is a strong demand signal in itself.
Reading the two lines together
The combinations that matter:
- Sales up, stock down at the same pace: a clean sell-through with no new supply.
- Stock up, sales flat: new inventory has arrived — a restock on primary or a wave of listings on resale.
- Both flat: the market has stalled and neither buyers nor sellers are acting.
- Stock falling, sales flat (resale): sellers are withdrawing listings, often expecting higher prices or moving to another marketplace.
- Sales accelerating while stock is low: classic behaviour before a sell-out, usually with rising prices.
Estimating time to sell-out from the chart
The two lines give a simple projection: days to sell-out ≈ available tickets ÷ average daily sales over the last week. If 900 tickets remain and the last seven days averaged 75 sales a day, stock would last about 12 days at the current pace.
It's a rough guide — restocks, price changes and the late ramp before the event all move it — but it turns two lines into a date. The share of the original stock already gone is the sell-through rate, a useful way to compare events of different sizes.
Track it with Eventory
Eventory charts the development of sales and of stock for every event it tracks, on resale and on Ticketmaster.
Frequently asked questions
What does a stock and sales chart show?
It shows cumulative tickets sold and tickets still available over time for one event. Together they reveal whether the event is selling through, stalling or receiving new inventory.
Why does available stock go up?
On primary sites, because the organiser released more tickets: holds, production seats, cancelled orders or extra capacity. On resale, because new sellers listed tickets. A rise in stock without a matching rise in sales is the visual sign of a restock.
How do I estimate when an event will sell out?
Divide the tickets still available by the recent average daily sales. For example, 2,000 tickets left at 100 sales a day suggests around 20 days, assuming no restocks and steady demand.
Why can estimated tickets sold go down?
When sales are estimated as capacity minus available tickets, any restock lowers the estimate unless capacity is adjusted. The dip doesn't mean tickets were refunded; it means new inventory went on sale.
Where can I see the development of sales and stock?
Eventory event pages chart the development of sales and of stock over time for resale and for Ticketmaster, alongside the daily sales chart.