BTC-MEMPOOLvsXXI
The Mempool Open Source Project 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.
BTC-MEMPOOL
The Mempool Open Source Project
🇺🇸 US
3,721 BTC
$237.9M market value
XXI
Twenty One Capital
🇺🇸 US
43,514 BTC
$2.8B market value
Metric
BTC-MEMPOOL
XXI
BTC holdings
3,721 BTC
43,514 BTC
Market value of BTC
$237.9M
$2.8B
Average cost per BTC
$34,404.59
$84,865.00
Total cost basis
$128.0M
$3.7B
mNAV (market cap ÷ BTC value)
—
0.64×
Sats per share
—
12.5k
Last disclosed purchase
Feb 14, 2025
- Feb 14, 2025+0 BTC$42.6M
- Jul 7, 2023+0 BTC$27.2M
- Aug 26, 2022+0 BTC$28.5M
- Jun 10, 2022+0 BTC$21.9M
- May 13, 2026+-1 BTC$93.7K
BTC-MEMPOOL vs XXI: frequently asked
Which company holds more Bitcoin, BTC-MEMPOOL or XXI?▾
Twenty One Capital (XXI) holds 43,514 BTC, compared to The Mempool Open Source Project's (BTC-MEMPOOL) 3,721 BTC — roughly 11.7× more.
What's the total Bitcoin value on the balance sheets of BTC-MEMPOOL and XXI?▾
BTC-MEMPOOL holds $237.9M worth of Bitcoin at current market prices. XXI holds $2.8B.
Who has a lower cost basis per BTC, BTC-MEMPOOL or XXI?▾
BTC-MEMPOOL's average cost is $34,404.59 per BTC. XXI's is $84,865.00. BTC-MEMPOOL is the lower cost basis.
When did BTC-MEMPOOL last buy Bitcoin?▾
BTC-MEMPOOL disclosed a 0 BTC purchase on February 14, 2025.
When did XXI last buy Bitcoin?▾
XXI disclosed a -1 BTC purchase on May 13, 2026.