Segment leader
also called LeaderTop domain by share
Definition
The tracked domain holding the highest CTR-modeled search market share in a segment for the period, reported with its share value.
How it's calculated
Every roster row's share value is collected, columns that are not finite numbers dropped, the list sorted by share descending on the PRECISE value, and the first entry taken as the leader, domain plus share, the share rounded to one decimal place for display. Computed in the MCP over values the semantic layer returns; nothing about the leader is asked of the warehouse.
Scope, grain and dimensions
- Grain
- One segment × period × medium.
- Dimensions
- intent · brand · keyword · page · country · device
- Required filters
- segment_id · selected_period · source_medium
- Aggregation
- Not aggregatable. It is a selection over one period's standings; a leader across periods must be recomputed per period, not averaged.
- Metric type
- derived metric · competitor domain, with its share as a % of tracked search demand
Data sources
Where you'll see this
Named reports that normally include this metric.
Skills and analyses that use it
Skills carry the judgment; the analysis verbs do the reading.
Analysis verbs
market_share_overviewmarket_share_query
Method rungs and levers
A rung tells you what a movement here can and cannot explain, read the rungs below it first.
levers L2 Demand modeling
Ask Quattr
- "Who leads this segment?" Simulate this →
- "Did the leader change this month?" Simulate this →
- "Is the leader a direct rival or an aggregator?" Simulate this →
How to read it
The leader is whoever takes the most results-page real estate for this tracked demand, routinely an aggregator, marketplace or forum rather than the rival named on an org chart. A surprising leader is usually correct and worth saying out loud.
Caveats, freshness and failure modes
Only tracked domains can lead: an untracked competitor with a larger real presence will never appear.
You can be the leader yourself; the standings mark your own row and exclude it from the competitor list.
Leadership does NOT flip on rounding, the sort runs on the precise share values and only the displayed figure is rounded to a tenth. Two domains can therefore publish the same share and still have a determinate order, which reads as an arbitrary tie unless the ordering is explained.
- Freshness
- ~1 day behind, Daily observation, available the following day.
Common failure modes
- Reporting a leader change as a market event when it is a roster change (a competitor added or removed from the segment).
- Explaining a leader-versus-runner-up ordering by the published shares when those two shares are equal after rounding.
- Naming a leader for a segment whose share columns are entirely unpopulated, the verbs return a stated no-data note instead.
Not the same as
The confusions that cause the most wrong decisions.
Segment leader Your rank in the standings Compare definitions →
The leader is an identity (which domain is first); the standings rank is your own ordinal position in the same sorted list.
Watch this metric read in a real run
All runs →
1 min 44 secTraffic just dropped. Is it you, or the market?Search Console + Rank tracking · Market share review◐Recreated from an anonymized session
2 min 18 secThe deck is due tomorrow. The numbers live in five places.Search Console + Rank tracking + AI visibility + Web analytics + Google Ads · Monthly exec review◐Recreated from an anonymized session
2 min 20 secWhere do we stand? Five questions answer it, in order.Search Console + Rank tracking + AI visibility · Monthly exec review◐Recreated from an anonymized session
Related metrics and workflows
Verification
A definition is the smallest part of this.
The measurement matters because something acts on it. Here is the rest of the showcase, in the order most people find useful.