Previously: seasons 1, 2, 3, 4, 5, 6, 7,8, 9,10, 11, 12, 13, 14, 15, 16, 17 (plus How large are squadrons?)
On each graph, points are on the Y-axis, and squadron position on the leaderboard is on the X-axis. Both scales are logarithmic. The light grey line (diamond marker) is the numbers for the previous season, the dark grey line (triangle marker) is the numbers for the same season last year (season 3), and all stats are PC only. As in previous seasons, the approximate power-law distribution continues, allowing estimates of total activity to be made without spending too long reading the boards.
(Political is excluded, because there are well-known exploits to allow very high scores, and because it's not clear even without the exploits what it's supposed to be measuring: the in-game description of "large and happy faction" is clearly wrong - possibly this will change if they ever implement BGS happiness properly)
Anti Xeno (218 pages)
Winners: Marauders Vanguard with ~37% of all points. AXI and Browncoat Uprising take the other trophies.
After last season's record, the drop this time is quite large. Marauders Vanguard file an extremely large score to take the Gold ... everyone else is down quite a lot on the previous season. The "last year" line on the graph is from before the payment increases for AX work, so isn't directly comparable. Still the second largest season for total number of participating squadrons, but the contribution per squadron is the lowest since the payment increases - perhaps reflecting the relative quietness on the Thargoid fronts compared with recent seasons.
Combat (2441 pages)
Winners: Stellanebula Project with ~1% of all points. Canonn and AXI take the other trophies.
A Gold for Stellanebula Project to add to their earlier Combat Silver and Exploration Silver, and a first combat trophy for Canonn as well. Combat is slightly up in overall activity compared with the previous season, and had the smallest drop in participating squadrons.
CQC (97 pages)
Winners: We Rock You Roll with ~17% of all points. CQC Discord and Black Birds Squadron take the other places.
The usual two entries for Gold and Silver, then a new name taking the Bronze. Overall activity is its lowest ever on this board, which is being hit very severely by the Horizons/Odyssey instancing split. Not much to do but wait until that's over.
Exploration (2673 pages)
Winners: IGAU with ~3% of all points. Canonn and Argus Defence Fleet take the other trophies.
A fairly close contest between leaderboard regulars IGAU and Canonn for the top two places, then a big gap to the third place, where another new name gets the trophy. Overall activity is down quite a bit, though the estimates don't put this as the quietest season.
Powerplay (89 pages)
Winners: Federal Liberal Command with ~13% of all points. Lavigny's Legion and Aisling's Angels take the other trophies.
The same winners as last season in the same order. Total volume is down, though still remains historically high - though a look at the graph shows just how little variation there normally is season to season, with this season, last season and last year all extremely similar.
Trade (2312 pages)
Winners: Pilots Trade Network Squadron with ~3% of all points. Cosmic Independent Agency and New Pilots Initiative take the other trophies.
Similar pattern to last season, with a big score from the winners - who take their second consecutive gold - and a more normal relationship between places for the rest. New Pilots Initiative move to the Trade leaderboard after four seasons in Combat, while Cosmic Independent Agency pick up their first trophy (and also get a Political Silver). You can see on the graph just how anomalous last year's Season 11 was for trade!
Other comments
So here is the first fully Odyssey season. Those paying close attention will have noticed the biggest change - unlike every other season, the total number of active squadrons has gone down! ... by 39 pages, which is not significantly different to where the long term trend would have put it anyway. Not exactly "doom", but still a sign of how shaky the Odyssey launch has been that it dropped at all. Pretty good chance that it'll return to trend next time, though, as it doesn't seem to be anywhere near as affected by ... well, anything ... as other activity measures are.
In terms of activity, most boards are down a bit - except Combat, which is generally slightly higher. It's hard to tell how much of this is due to lower activity in general, and how much of it is due to Odyssey activity not being scored. (Combat can get points from Odyssey activity, which may explain its stability compared with Season 17) The exception here is CQC, which is really suffering - perhaps a chance for a surprise Gold next time, if anyone is looking for an opportunity?

On each graph, points are on the Y-axis, and squadron position on the leaderboard is on the X-axis. Both scales are logarithmic. The light grey line (diamond marker) is the numbers for the previous season, the dark grey line (triangle marker) is the numbers for the same season last year (season 3), and all stats are PC only. As in previous seasons, the approximate power-law distribution continues, allowing estimates of total activity to be made without spending too long reading the boards.
(Political is excluded, because there are well-known exploits to allow very high scores, and because it's not clear even without the exploits what it's supposed to be measuring: the in-game description of "large and happy faction" is clearly wrong - possibly this will change if they ever implement BGS happiness properly)
Anti Xeno (218 pages)
Winners: Marauders Vanguard with ~37% of all points. AXI and Browncoat Uprising take the other trophies.
After last season's record, the drop this time is quite large. Marauders Vanguard file an extremely large score to take the Gold ... everyone else is down quite a lot on the previous season. The "last year" line on the graph is from before the payment increases for AX work, so isn't directly comparable. Still the second largest season for total number of participating squadrons, but the contribution per squadron is the lowest since the payment increases - perhaps reflecting the relative quietness on the Thargoid fronts compared with recent seasons.
Combat (2441 pages)
Winners: Stellanebula Project with ~1% of all points. Canonn and AXI take the other trophies.
A Gold for Stellanebula Project to add to their earlier Combat Silver and Exploration Silver, and a first combat trophy for Canonn as well. Combat is slightly up in overall activity compared with the previous season, and had the smallest drop in participating squadrons.
CQC (97 pages)
Winners: We Rock You Roll with ~17% of all points. CQC Discord and Black Birds Squadron take the other places.
The usual two entries for Gold and Silver, then a new name taking the Bronze. Overall activity is its lowest ever on this board, which is being hit very severely by the Horizons/Odyssey instancing split. Not much to do but wait until that's over.
Exploration (2673 pages)
Winners: IGAU with ~3% of all points. Canonn and Argus Defence Fleet take the other trophies.
A fairly close contest between leaderboard regulars IGAU and Canonn for the top two places, then a big gap to the third place, where another new name gets the trophy. Overall activity is down quite a bit, though the estimates don't put this as the quietest season.
Powerplay (89 pages)
Winners: Federal Liberal Command with ~13% of all points. Lavigny's Legion and Aisling's Angels take the other trophies.
The same winners as last season in the same order. Total volume is down, though still remains historically high - though a look at the graph shows just how little variation there normally is season to season, with this season, last season and last year all extremely similar.
Trade (2312 pages)
Winners: Pilots Trade Network Squadron with ~3% of all points. Cosmic Independent Agency and New Pilots Initiative take the other trophies.
Similar pattern to last season, with a big score from the winners - who take their second consecutive gold - and a more normal relationship between places for the rest. New Pilots Initiative move to the Trade leaderboard after four seasons in Combat, while Cosmic Independent Agency pick up their first trophy (and also get a Political Silver). You can see on the graph just how anomalous last year's Season 11 was for trade!
Other comments
So here is the first fully Odyssey season. Those paying close attention will have noticed the biggest change - unlike every other season, the total number of active squadrons has gone down! ... by 39 pages, which is not significantly different to where the long term trend would have put it anyway. Not exactly "doom", but still a sign of how shaky the Odyssey launch has been that it dropped at all. Pretty good chance that it'll return to trend next time, though, as it doesn't seem to be anywhere near as affected by ... well, anything ... as other activity measures are.
In terms of activity, most boards are down a bit - except Combat, which is generally slightly higher. It's hard to tell how much of this is due to lower activity in general, and how much of it is due to Odyssey activity not being scored. (Combat can get points from Odyssey activity, which may explain its stability compared with Season 17) The exception here is CQC, which is really suffering - perhaps a chance for a surprise Gold next time, if anyone is looking for an opportunity?