Three Large-Holder Tiers Moved in Three Different Directions Last Week

The Van Rossem hard fork activated on Saturday, September 19, 2026 at 17:44 ET, moving Cardano to Protocol Version 11 — the network's first fork proposed, debated, and ratified entirely through on-chain Voltaire governance, with a DRep supermajority of 78.97% against the 60% threshold. The two days that followed carried the highest network activity of the week. Daily transactions on September 21 reached 33,919, up 71% from the September 16 weekly low of 19,844. Active addresses climbed to 16,388 (weekly high), Plutus script calls reached 11,891, and total fees cleared 11,771 ADA.

CardanoScope on-chain data does not establish the fork as the cause of that activity lift. The rise in transactions began before activation, and external catalysts — including the Cardano Foundation's reported entry into Mastercard's Crypto Partner Program — overlap the same window.

Underneath the activity, the more interesting structural story is a redistribution across the three large-holder tiers tracked in our dataset. Between the September 14 and September 21 snapshots, the three tiers moved in three different directions.

The tier-level movements

Mega tier (largest wallets): 458 holders holding 20,812,709,877 ADA on Sept 21, versus 458 holders holding 20,786,493,988 ADA on Sept 14. Net aggregate change: +26,215,889 ADA. Holder count unchanged.

Whale tier (mid-large wallets): 1,035 holders holding 4,156,652,539 ADA on Sept 21, versus 1,044 holders holding 4,181,178,063 ADA on Sept 14. Net aggregate change: -24,525,524 ADA. Holder count down by nine.

Shark tier (entry-level large wallets): 1,395 holders holding 1,829,098,840 ADA on Sept 21, versus 1,378 holders holding 1,800,107,082 ADA on Sept 14. Net aggregate change: +28,991,758 ADA. Holder count up by 17.

Read as a sequence: aggregate balances grew at the top tier and at the entry-level large-holder tier, while the middle tier contracted in both ADA and wallet count. The three tiers combined added roughly 30.7 million ADA over seven days.

What these numbers can and cannot tell us

These are aggregate tier balances. CardanoScope on-chain data tracks the total ADA held by all addresses currently inside each tier, not matched-wallet flows over the period. A constant mega-tier holder count of 458 does not mean the same 458 wallets held those positions throughout the week — membership can rotate within the tier without changing the count. Similarly, the 17 additional shark-tier wallets on Sept 21 do not establish that they are new entrants to the network; some may be balances reshuffled out of larger wallets, others may be older addresses that crossed the tier threshold during the period.

I am describing these as aggregate tier-balance shifts, not as accumulation by or distribution from specific holders. Saying "mega wallets accumulated" without matched-wallet flow data overstates what a snapshot comparison shows.

The holder-count math supports a more limited structural read. The mega tier held its count constant while adding ADA — consistent with stable membership turning over internally. The whale tier lost both count and balance — a contraction in both dimensions. The shark tier is the only one that added wallet count while also adding ADA.

Transfer activity moved in a different pattern

Large-tier transfer counts and volumes did not peak on the same day. The full series for the seven-day window:

• Sept 15: 13 mega / 52 whale / 29 shark transfers (94 events; 504,829,477 ADA)
• Sept 16: 9 / 47 / 32 (88; 508,007,991)
• Sept 17: 8 / 43 / 27 (78; 571,701,156) — highest total ADA moved
• Sept 18: 6 / 40 / 52 (98; 408,856,152) — highest event count
• Sept 19: 7 / 38 / 25 (70; 374,661,471)
• Sept 20: 7 / 40 / 15 (62; 353,798,237)
• Sept 21: 5 / 38 / 39 (82; 318,063,205)

Total ADA moved peaked on Sept 17 (571.7M ADA), driven by an eight-event mega-tier day that included the week's largest single transfer of 161,106,239 ADA at 06:20 UTC. Total event count peaked the next day, Sept 18, on a shark-heavy 52 events. By Sept 21, both metrics had compressed: total ADA moved fell 44% from the Sept 17 peak; mega-tier transfer count fell 62% from the Sept 15 peak of 13 to 5.

The next-largest transfers of the week — eight separate transactions between 144 and 146 million ADA — settled at near-daily intervals between Sept 16 and Sept 21. The regularity points to a recurring settlement pattern rather than isolated events.

Methodology

Tiers are defined by ADA balance thresholds in the CardanoScope dataset (mega, whale, shark), and wallet aggregation is by current balance. Addresses can move between tiers as balances change. The dataset does not provide matched-wallet flow data, which is why the tier shifts above are reported as aggregate-balance changes rather than as identifiable accumulation or distribution events. The Sept 14 and Sept 21 snapshots are timestamped exports from the CardanoScope database.

What the data does not show

It does not show why the middle tier contracted. Three readings are each consistent with the same numbers: middle-tier holders selling into the recovery with bids absorbed at the top and shark tiers; middle-tier holders splitting balances into smaller operational addresses; or a small number of whale-tier wallets being consolidated or abandoned. Aggregate tier snapshots cannot distinguish these.

It also does not show that the price recovery from the September 16 low near $0.19 to $0.2448 today was caused by large-holder flows. The data is consistent with mega-tier wallets not selling into the move. That is not the same as evidence they drove it.