Hyperliquid Whale Tied to Fasanara Capital Holds $38M Bitcoin Short

A Hyperliquid whale running a $38 million Bitcoin short, an address that on-chain sleuths have linked to a London asset manager with $5 billion under management, is the kind of trade that gets screenshotted on Crypto Twitter and ignored by everyone else. That would be a mistake. The wallet known as BobbyBigSize has cleared $159 million in profit over seven months. And right now, with Bitcoin clawing back toward $78,000, this trader is short.

Who Is BobbyBigSize and Why Does the $38M Bitcoin Short Matter?

BobbyBigSize is the on-chain handle for the wallet 0x7fda...c517d1, an account that has pushed roughly $11 billion in cumulative volume across Hyperliquid's perpetuals book. According to Hyperliquid BobbyBigSize tracking data, the trader closes profitable on 63% of positions, a hit rate that institutional desks would frame and hang on a wall.

The active book is what raised eyebrows this week. A $38 million short stacked across Bitcoin and a basket of altcoins. A $21 million leveraged long on Ether opened the week prior. Net direction: bearish on BTC, surgically bullish on ETH. Read it however you want, but the trader is paying real money to bet the rally stalls.

63% of its trades result in positive outcomes, which is considered highly successful.

The Fasanara Capital Connection

Arkham Intelligence previously flagged the wallet as belonging to Fasanara Capital, a London-based asset manager that says it runs over $5 billion in client capital. That's the headline most outlets are leading with. The fine print is more interesting.

According to the firm's own disclosures, Fasanara Capital Bitcoin short operations sit inside Fasanara Digital, an arm launched in 2018 that manages around $400 million across market-neutral strategies and venture bets, plus another $150 million through a quantitative multi-manager approach in liquid markets. Nowhere in the public materials does the firm spell out whether this Bitcoin short is a directional view, a hedge against a long book held elsewhere, or a delta-neutral leg of an arbitrage trade. That ambiguity matters. A $38 million short from a directional fund is a bearish signal. The same position from a market-neutral desk is just plumbing.

Negative Funding Rates Tell Their Own Story

Even if you ignore the whale entirely, the broader derivatives setup is flashing the same color. Bitcoin negative funding rates on Binance and Bybit have flipped negative, meaning short sellers are paying longs to keep their positions open. Under typical market conditions, longs pay shorts an annualized rate of roughly 6% to 12% to hold leverage. When that math inverts, it's because the shorts outnumber the longs badly enough to skew the funding mechanism.

Hyperliquid itself has stayed marginally positive on funding for both BTC and ETH, a quirk that tracks with the platform's heavier institutional and pro-trader user base. But the divergence between Hyperliquid and the retail-heavier Binance and Bybit books is the part worth watching. Retail is leaning short. The whales are mixed. That's not the texture of a market about to rip higher unopposed.

• Binance: Negative funding, indicating elevated short demand
• Bybit: Negative funding, same bearish skew
• Hyperliquid: Slightly positive funding, suggesting institutional positioning leans long

The Bull Case Hasn't Broken

Here's the counter. Bitcoin is up 29% from its $60,100 yearly low printed on February 6. Spot is grinding toward $78,000 with a structure that technical analysts have spent the past two weeks describing as a coiled breakout. The macro backdrop, with rate-cut expectations firming and ETF flows turning constructive, doesn't obviously support a sharp leg lower.

BobbyBigSize is also not infallible. The same account that booked $159 million in profit during the brutal October to November 2025 drawdown, when leveraged shorts on Ether, Hyperliquid's HYPE token, Avalanche, and even Fartcoin paid out, has lost $561,000 over the last 30 days. Algorithmic strategies decay. What worked in a bear leg can bleed in a chop. The trader's average position lasts a little over two weeks, with a median hold of under four days, suggesting this is tactical positioning rather than a long-conviction call.

What Bitcoin Traders Should Actually Watch

Forget the whale for a second. The signal worth tracking is the spread between Hyperliquid funding and Binance and Bybit funding. As long as that spread stays wide, with retail venues paying shorts and pro venues paying longs, the market is split, and split markets resolve violently. A retest of the $75,000 level remains very much on the table even inside an intact uptrend.

If funding normalizes across all three venues and the BobbyBigSize short starts to bleed, that's the unwind trigger. Forced cover from a $38 million position doesn't move Bitcoin on its own, but it lights up the order book at exactly the moment the rest of the bearish leverage is also closing out. That's how short squeezes start. Watch the funding, watch the wallet, and stop pretending one whale is the whole story.