BIS -2x ProShares UltraShort NASDAQ Biotechnology

BEAR ETF standard · Issuer ProShares · Tracks NASDAQ Biotechnology (IBB) · Listed 2010-04-06

Quote & options All leveraged ETFs

Implied AUM

$1.9M

shares out × price

Last close

$11.64

20261001

30-day avg volume

9,176

options listed →

BIS realized

—

what holders actually earned

Theoretical -2x

—

-2x × NASDAQ Biotechnology's return

Decay gap

—

realized minus theoretical

Realized vs theoretical -2x NASDAQ Biotechnology

Cumulative return of BIS against a clean -2x of NASDAQ Biotechnology's return over the same window; the red line (right axis) is the gap between them.

Pair counterpart: BIB (+2x bull, ProShares Ultra NASDAQ Biotechnology)

Shorting both legs of a daily-reset bull/bear pair captures their combined decay over time. It isn't free money — the edge depends on borrow rates (often punitive on the bear leg) and assignment risk on hard-to-borrow shares.

Other leveraged products on NASDAQ Biotechnology

Symbol	Factor	Direction	Issuer	Name	Implied AUM	30d volume	Options
BIB	+2x	BULL	ProShares	ProShares Ultra NASDAQ Biotechnology	$92.8M	9,382	✓

How BIS works

BIS targets -2x the daily return of NASDAQ Biotechnology — not the return over longer windows. It rebalances every day, so over weeks and months its result drifts away from -2x × the index, usually downward when the market chops around.

The maths: the drag is roughly −½ × N × (N−1) × σ² per period (N = leverage, σ = the index's volatility). For a -2x fund on an index with 25% annual volatility that is several percent a year before fees — the red line above is that drag measured.

Short-term trades (a day or a few) are what these funds are built for. Premium sellers like their rich option IV — see the quote page. Multi-day directional bets work in strong trends and get eaten in chop.

Not investment advice.