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Tracked since Sep 27, 2026 — 1 daily snapshot so far. The card below is built from what we track and refreshes nightly.
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Data: Substack public leaderboards and publication archives, refreshed nightly, plus public beehiiv sitemaps and recommendation pages, refreshed weekly. Source for this page: Undiscovered Compounders. Subscriber counts are Substack’s own rounded public figures, so week-on-week changes move in steps. beehiiv audience sizes are self-reported by the publisher and are not verified. Last snapshot: Sep 27, 2026.