How the boards work

Every rule behind every leaderboard.

The windows, the turnover floors, how each ranking is worked out, and what every mark beside a figure means. The same wording sits under each board on the site — this page is generated from it, not retyped, so the two cannot drift apart.

Free to read. No account needed.

ASX announcements, ranked by what the market did about them

Ranked by the company’s close-to-close move on the day it filed — the day’s price, not a measure of the announcement’s impact.

Exploration & resource announcements · Biotech & healthcare announcementsranked by close-of-day move, A$250k+ traded, one row per company, announcements filed after the close sit out until their market day.
What “move” meansMove is the company’s close-to-close move on the day it filed — the day’s price, not a measure of this announcement’s impact.

ASX risers and fallers

The biggest price moves in mining and healthcare, with the volume behind them — and the companies that moved hard with no announcement lodged.

Weekly risers · Weekly fallersClose-to-close move over the last 5 trading sessions, A$250k+ traded across the week. ×VOL is the week’s average daily volume against the week before it.
Monthly risers · Monthly fallersClose-to-close move over the last 21 trading sessions, A$1m+ traded across the month. ×VOL is the month’s average daily volume against the month before it.
Moved up — no news · Moved down — no newsMoved 5%+ on the day with A$250k+ traded, and no ASX announcement that day or the 2 sessions before it. ×VOL is the day’s volume against its daily average over the month before.
When weekly has no rowsNo riser cleared the A$250k weekly turnover floor — a quiet stretch, not a fault.
When monthly has no rowsNo riser cleared the A$1m monthly turnover floor — a quiet stretch, not a fault.
When moved with no news has no rowsNothing moved up 5%+ without news — a company lands here only after 3 announcement-free sessions, and most movers have news. Empty is the usual answer.

Biggest ASX market cap gains and falls

A company is worth its shares on issue × its share price. These boards rank by the dollars that number moved, which is not the same as the percentage the share price moved — a big company can gain more money on a small move than a small one gains on a large one. Each window and each size band is listed below in full. The rule is the same shape every time; what changes is the window it measures over and the size of company it admits.

Weekly — AllMarket cap is shares on issue × close — what the whole company is worth. Ranked by the A$ change across the last 5 trading sessions, A$250k+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Weekly — Under A$1bMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$1b at the last close. Ranked by the A$ change across the last 5 trading sessions, A$250k+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Weekly — Under A$500mMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$500m at the last close. Ranked by the A$ change across the last 5 trading sessions, A$250k+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Weekly — Under A$100mMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$100m at the last close. Ranked by the A$ change across the last 5 trading sessions, A$250k+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Monthly — AllMarket cap is shares on issue × close — what the whole company is worth. Ranked by the A$ change across the last 21 trading sessions, A$1m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Monthly — Under A$1bMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$1b at the last close. Ranked by the A$ change across the last 21 trading sessions, A$1m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Monthly — Under A$500mMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$500m at the last close. Ranked by the A$ change across the last 21 trading sessions, A$1m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Monthly — Under A$100mMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$100m at the last close. Ranked by the A$ change across the last 21 trading sessions, A$1m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Quarterly — AllMarket cap is shares on issue × close — what the whole company is worth. Ranked by the A$ change across the last 63 trading sessions, A$3m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Quarterly — Under A$1bMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$1b at the last close. Ranked by the A$ change across the last 63 trading sessions, A$3m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Quarterly — Under A$500mMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$500m at the last close. Ranked by the A$ change across the last 63 trading sessions, A$3m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Quarterly — Under A$100mMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$100m at the last close. Ranked by the A$ change across the last 63 trading sessions, A$3m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Yearly — AllMarket cap is shares on issue × close — what the whole company is worth. Ranked by the A$ change across the last 250 trading sessions, A$12m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Yearly — Under A$1bMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$1b at the last close. Ranked by the A$ change across the last 250 trading sessions, A$12m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Yearly — Under A$500mMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$500m at the last close. Ranked by the A$ change across the last 250 trading sessions, A$12m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
Yearly — Under A$100mMarket cap is shares on issue × close — what the whole company is worth. Companies worth under A$100m at the last close. Ranked by the A$ change across the last 250 trading sessions, A$12m+ traded over the period. The percentage beside each figure is that same A$ change against the company’s market cap at the start of the window. Rows marked * are measured on today’s share count, so they are what today’s shareholders gained or lost on the price — not the company’s change in market cap.
The * mark and the ↑shares flagA row marked * is measured on today’s share count rather than a dated one from the start of the window. A row flagged ↑shares is one whose shares on issue are known to have changed inside the window, so part of its market-cap move is new shares rather than a new price.
When a market-cap board has no rowsNo company under A$100m gained market cap on A$250k+ of trade over the week window — a quiet stretch, not a fault.

The daily email

Why the email is shorter than the site.

Why does the email show fewer boards than the site?An email cannot have tabs, so every board it carries is printed one after another and nothing is hidden behind one. That means it can only carry a few of them before a mail client starts cutting the message off — so it sends the weekly boards on a weekday, the monthly ones at the weekend, and the smallest size band of the market-cap boards. Every other board, every other period and every other size band is on the site, free, with no account needed.
Why are the boards in the email cut short?Each board in the email is cut to its top few rows for the same reason. The row count is stated on every board — “Showing 4 of 9” — so a short board can never read as the whole one, and the full board is one tap away on the site.
Where did the rules under each board go?Here. They were printed inside the email until 2026-08-27, which cost roughly five kilobytes of every send on a message Gmail cuts at about a hundred — space that is now company rows instead. Nothing was dropped: every sentence on this page is generated by the same code that writes it under the live board, and the plain-text version of the same email still prints every rule under its own board.
Is any of this a recommendation?No. Every figure on every board is a close-to-close price move and the money traded behind it, measured from public ASX data. A company appearing on a board is not a view about that company.

Catalyst Ahead is a research tool, not financial advice. See .

Not financial advice. Catalyst Ahead is an AI-driven research tool. All projections are inferences from public company announcements. Always do your own research and consult a licensed adviser before trading.