The fastest growing business subreddit right now is r/ClaudeAI, which added 64,694 members (5.4%) between 18 October and 11 November 2026. r/buildinpublic (+3.9%) and r/LeadGeneration (+3.6%) come next. We track member counts for 99 subreddits where founders, marketers and developers talk shop, and these figures come from five readings taken over 24 days.
How we measure growth
Reddit doesn't publish member history, and the sites that used to keep it, like GummySearch, have shut down. So we record it ourselves: every few days we store the member count Reddit reports for each subreddit. This table compares the first reading (18 October 2026) with the latest (11 November 2026), 24 days apart.
- Growth % is the change in members divided by the starting count. It favours smaller subreddits, where a few thousand new members is a big share.
- Members added is the raw gain, which favours the giants.
- The 99 subreddits are the business, SaaS, AI, developer, marketing and finance communities our tools track. This is not a ranking of all of Reddit, where meme and entertainment subreddits dominate. For that, see the most popular subreddits by members.
The 25 fastest growing subreddits, by growth %
| # | Subreddit | Members 18 Oct | Members 11 Nov | Added | Growth |
|---|---|---|---|---|---|
| 1 | r/ClaudeAI | 1,205,064 | 1,269,758 | +64,694 | +5.37% |
| 2 | r/buildinpublic | 124,774 | 129,646 | +4,872 | +3.90% |
| 3 | r/LeadGeneration | 69,593 | 72,124 | +2,531 | +3.64% |
| 4 | r/SideProject | 872,315 | 899,165 | +26,850 | +3.08% |
| 5 | r/AI_Agents | 464,425 | 477,144 | +12,719 | +2.74% |
| 6 | r/Solopreneur | 77,737 | 79,697 | +1,960 | +2.52% |
| 7 | r/LocalLLaMA | 851,976 | 872,307 | +20,331 | +2.39% |
| 8 | r/SaaS | 827,976 | 843,812 | +15,836 | +1.91% |
| 9 | r/indiehackers | 197,136 | 200,874 | +3,738 | +1.90% |
| 10 | r/agency | 101,918 | 103,707 | +1,789 | +1.76% |
| 11 | r/Startup_Ideas | 347,094 | 352,795 | +5,701 | +1.64% |
| 12 | r/cybersecurity | 1,540,360 | 1,562,381 | +22,021 | +1.43% |
| 13 | r/ObsidianMD | 371,487 | 376,785 | +5,298 | +1.43% |
| 14 | r/automation | 237,665 | 240,955 | +3,290 | +1.38% |
| 15 | r/microsaas | 221,378 | 224,363 | +2,985 | +1.35% |
| 16 | r/b2bmarketing | 102,985 | 104,362 | +1,377 | +1.34% |
| 17 | r/GrowthHacking | 159,900 | 162,034 | +2,134 | +1.33% |
| 18 | r/selfhosted | 857,399 | 868,746 | +11,347 | +1.32% |
| 19 | r/figma | 15,528 | 15,732 | +204 | +1.31% |
| 20 | r/homelab | 1,106,630 | 1,121,024 | +14,394 | +1.30% |
| 21 | r/forhire | 693,664 | 702,305 | +8,641 | +1.25% |
| 22 | r/webscraping | 104,516 | 105,661 | +1,145 | +1.10% |
| 23 | r/recruiting | 219,967 | 222,347 | +2,380 | +1.08% |
| 24 | r/OSINT | 252,814 | 255,511 | +2,697 | +1.07% |
| 25 | r/PPC | 287,781 | 290,750 | +2,969 | +1.03% |
Over the same 24 days the median subreddit in the set grew 0.66%. Anything above about 1% is growing several times faster than the typical business community.
The biggest gains in raw members
| Subreddit | Members added | Growth |
|---|---|---|
| r/ClaudeAI | +64,694 | +5.37% |
| r/wallstreetbets | +56,283 | +0.28% |
| r/ChatGPT | +50,427 | +0.43% |
| r/SideProject | +26,850 | +3.08% |
| r/cybersecurity | +22,021 | +1.43% |
| r/LocalLLaMA | +20,331 | +2.39% |
| r/stocks | +17,804 | +0.19% |
| r/personalfinance | +16,697 | +0.08% |
| r/careerguidance | +15,904 | +0.32% |
| r/SaaS | +15,836 | +1.91% |
What the rising subreddit trends say
- Most of the growth is in AI tooling. r/ClaudeAI, r/AI_Agents, r/LocalLLaMA and r/cursor all sit in the top 30. If you sell to developers building with AI, those people are piling into these communities.
- Founders keep moving into the build-in-public subreddits. r/buildinpublic, r/SideProject, r/Solopreneur, r/indiehackers and r/microsaas all grew faster than the median. Several of them, r/SideProject and r/buildinpublic among them, let founders share their own work within their rules.
- Go-to-market subreddits are growing as well. r/LeadGeneration, r/agency, r/b2bmarketing, r/GrowthHacking and r/PPC show marketers and sellers still bringing their questions to Reddit.
- The slowest growers are the big, mature subreddits. r/javascript, r/personalfinance, r/CryptoCurrency, r/Design and r/ethereum each added well under 0.1%. That isn't a bad sign. It means the audience is already there.
How to use a growing subreddit without getting banned
A fast-growing subreddit lets you get known early, before competitors fill it. It also tends to have new members who don't know the rules yet, so moderators are strict.
- Read the rules first. Our post rule checker checks a draft against them.
- Check size and activity with subreddit stats, and see when its top posts go up with best time to post.
- Answer questions for a few weeks before you mention your product. The Reddit 9:1 rule explains why.
- If the subreddit allows self-promotion only on certain days or in certain threads, use those. See our list of self promotion subreddits.
How often this list is updated
We pull new readings as snapshots come in, roughly every few days, and update this page monthly. Each table shows the two dates it compares. For stats on one subreddit today, use subreddit stats. To find communities like one you already know, use similar subreddits.
Want us to find the growing communities your buyers use and post in them for you? See our Reddit marketing agency.
If you'd rather find these threads yourself, our Reddit monitoring app ranks them by fit and drafts replies. You post them yourself, or on Done for you we post them through our warmed-up accounts.
Put this to work
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