Short-Flow#25tier 1live in production

`borrow rate spike`

cadence: Weeklydata: mediumshort onlylong onlylong short

Mechanism

When the cost to borrow a stock spikes, it

Signal rule

z-score of cost-to-borrow over trailing 60d; short the top decile

Data dependencies

borrow_fees (IBKR)
Worker data table — see services/worker schema.
short_interest
Bi-weekly NYSE/NASDAQ short-interest reports with days-to-cover.

Expected edge

~10% ann. on shorting expensive-to-borrow (Engelberg-Reed-Ringgenberg 2018)

Illustrative pattern only

NOT a backtest

Illustrative pattern only — see /app for live backtests and the actual current equity curve.

Example tickers where this is likely to fire

GME BYND PLTR

Illustrative only — the signal fires based on the live data, not a fixed list.

Related families

short interest changeShort-Flow

Two complementary readings of FINRA's daily short-sale

ftd threshold listShort-Flow

The SEC's Threshold Security List names securities that have had 5+ consecutive settlement days with failures-to-deliver (FTDs) ≥ 10,000 shares AND ≥ 0.5% of shares outstanding. Inclusion on the

borrow ftd squeezeShort-Flow

Beschwitz, Honkanen & Schmidt (2024) *Journal of Financial Economics*: "Costly Arbitrage and the Short-Squeeze Premium." Novel finding: when all three short-side stress signals fire simultaneously — top-decile borrow-rate Δ, Reg-SHO threshold inclusion, and elevated FINRA short-volume ratio — the next 5 trading days mean-revert sharply higher. The 3-table confluence is what…

Explore `borrow rate spike` on alphactor.ai

See which tickers this family is currently firing on, with live signals and rankings.

Open universe with this filter →Browse all 87 families

borrow rate spike