Jane Street’s reported three-fund bitcoin ETF value rose 93%

Jane Street reported $1.790 billion of long share positions across BlackRock’s iShares Bitcoin Trust ETF, Fidelity’s Wise Origin Bitcoin Fund and the ARK 21Shares Bitcoin ETF at September 30, up 93.3% from $926.0 million at June 30, according to Coinburn calculations from two Form 13F filings.

The change matters because the trading firm substantially rearranged its holdings among three of the largest U.S. spot bitcoin funds during the third quarter. It does not establish a bullish $864.1 million cash purchase, however. Form 13F reports quarter-end fair value, so bitcoin’s rise during the quarter lifted fund share prices, and the disclosure omits short positions and some other hedges.

Jane Street filed the September snapshot with the Securities and Exchange Commission on November 12. Coinburn is reporting the comparison on November 14; it is not a current portfolio reading.

Fidelity and ARK gained shares as BlackRock declined

The clearest change occurred in Fidelity’s fund. Jane Street reported 7,010,008 FBTC shares worth $509.2 million at September 30, compared with 886,736 shares worth $45.3 million three months earlier. The share count increased 690.5%, or nearly eightfold, over the quarter.

Its ARKB position rose to 11,689,194 shares valued at $323.7 million from 2,700,151 shares valued at $52.5 million. That was a 332.9% increase in shares.

IBIT moved in the opposite direction by share count. Jane Street reported 20,221,140 shares worth $957.3 million at September 30, down 18.7% from 24,878,191 shares at June 30. The position’s reported value nevertheless increased from $828.2 million because the quarter-end value per share was higher.

All values and share counts combine the separate manager rows shown for each fund in Jane Street’s information tables. The percentages are Coinburn calculations using the June 30 and September 30 snapshots. They measure changes between two dates, not the path, timing or prices of trades within the quarter.

Why the $864 million increase is not a flow figure

The three positions’ combined reported value increased by approximately $864.1 million. That difference mixes two effects: changes in the number of shares and changes in each fund’s market value. It therefore cannot be treated as money newly allocated to bitcoin ETFs.

Nor does a larger long position reveal Jane Street’s directional view on bitcoin. The filing separately reports put and call positions in the funds, while SEC guidance says managers do not include short equity positions, do not subtract shorts from longs and do not report options they have written. The public table consequently cannot produce the firm’s net economic exposure.

That limitation is especially relevant for a trading firm active in exchange-traded funds. Inventory held for market making, client facilitation or arbitrage can appear as a large quarter-end long position while being offset elsewhere. The filings do not identify the strategy behind any position, the beneficial clients, or whether shares were held as inventory or an investment.

The comparison also covers only IBIT, FBTC and ARKB. Jane Street’s information tables contain other crypto-linked securities, so the $1.790 billion figure is not its complete digital-asset portfolio or even a complete tally of every bitcoin fund position.

What the filing does establish

The defensible conclusion is narrower: by September 30, Jane Street reported far more FBTC and ARKB shares and fewer IBIT shares than at June 30, while the combined fair value of those three long positions nearly doubled.

The Q3 filing was accepted on November 12, 43 days after the measurement date. Positions could have changed before the filing became public and again before Coinburn’s November 14 close edition. Form 13F can also be amended, and the SEC states that accepting a filing does not mean the agency has determined it is accurate or complete.

The next comparable disclosure will cover December 31 and will arrive after that quarter ends. Until then, the September filing is useful evidence of a major shift in reported quarter-end holdings, but not proof of present exposure, investor demand or an unhedged bet on bitcoin.