ARKBvsXXI
ARK 21Shares Bitcoin ETF vs Twenty One Capital
Side-by-side Bitcoin treasury comparison: holdings, market cap, mNAV ratio, BTC per share, cost basis, and recent purchases. Numbers refresh every 5 minutes from SEC filings and live market data.
ARKB
ARK 21Shares Bitcoin ETF
🇺🇸 US
32,310 BTC
$2.1B market value
XXI
Twenty One Capital
🇺🇸 US
43,514 BTC
$2.8B market value
Metric
ARKB
XXI
BTC holdings
32,310 BTC
43,514 BTC
Market value of BTC
$2.1B
$2.8B
Average cost per BTC
—
$84,865.00
Total cost basis
—
$3.7B
mNAV (market cap ÷ BTC value)
—
0.64×
Sats per share
22.6k
12.5k
- Jul 10, 2026+-2,057 BTC$131.8M
- Jul 9, 2026+-632 BTC$39.9M
- Jul 8, 2026+4,272 BTC$266.0M
- Jul 7, 2026+-132 BTC$8.4M
- Jul 6, 2026+514 BTC$33.0M
ARKB vs XXI: frequently asked
Which company holds more Bitcoin, ARKB or XXI?▾
Twenty One Capital (XXI) holds 43,514 BTC, compared to ARK 21Shares Bitcoin ETF's (ARKB) 32,310 BTC — roughly 1.3× more.
What's the total Bitcoin value on the balance sheets of ARKB and XXI?▾
ARKB holds $2.1B worth of Bitcoin at current market prices. XXI holds $2.8B.
Who has a lower cost basis per BTC, ARKB or XXI?▾
Cost basis disclosure is inconsistent across these two entities; check each company's detail page for per-purchase history.
When did ARKB last buy Bitcoin?▾
ARKB disclosed a -2,057 BTC purchase on July 10, 2026.
When did XXI last buy Bitcoin?▾
XXI disclosed a -1 BTC purchase on May 13, 2026.