State Street SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) Gamma Exposure (GEX) & Greeks
Gamma exposure (GEX) analysis shows how options positioning creates dealer hedging pressure across strikes. Includes delta, vanna, charm, vomma, and vega exposure by strike price.
State Street SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) operates in the Financial Services sector, specifically the Asset Management industry, with a market capitalization near $46.43B, listed on AMEX, carrying a beta of 0.00 to the broader market. The State Street SPDR Bloomberg 1-3 Month T-Bill ETF seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of the Bloomberg 1-3 Month U. public since 2007-05-30.
Snapshot as of May 15, 2026.
- Spot Price
- $91.53
- Net Gamma
- -$1.6M
- Net Delta
- $2.2M
- Net Vega
- -$20.1K
- Gamma Concentration
- 0.75
As of May 15, 2026, State Street SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) has negative net gamma exposure of $1.6M under the standard dealer-hedging convention. Net delta exposure is $2.2M. Negative GEX means dealers are net short gamma: they must sell into weakness and buy into strength, amplifying realized volatility and accelerating directional moves.
BIL Strategy Sizing in the Current GEX Regime
State Street SPDR Bloomberg 1-3 Month T-Bill ETF is in a negative dealer-gamma regime ($1.6M). Net dealer delta of $2.2M sets the size of the directional hedging flow that fires as spot moves. In this regime, momentum and breakout strategies fit the regime: long calls or puts, ratio backspreads, calendar spreads positioned for vol expansion. Realized volatility tends to overshoot implied during negative-gamma stretches, hurting indiscriminate short-vol exposure. The gamma-flip level - the spot price at which net dealer gamma changes sign - is the most actionable anchor for sizing: through-flip moves trigger qualitatively different hedging behavior than within-regime moves, so risk-defined structures sized to the current spot may not stay sized correctly if a flip is near.
Learn how gamma exposure is reported and how to read the data →
Frequently asked BIL gamma exposure (gex) & greeks questions
- What is the current BIL gamma exposure (GEX)?
- As of May 15, 2026, State Street SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) net gamma exposure is negative at $1.6M under the standard dealer-hedging convention. Net dealer delta exposure is $2.2M. GEX aggregates the gamma sitting on dealer books across all listed strikes and expirations.
- Is BIL in positive or negative dealer gamma right now?
- BIL is currently in negative dealer gamma. Dealers net short gamma must sell into weakness and buy into strength to maintain delta-neutrality, which amplifies realized volatility and tends to accelerate directional moves.
- What does BIL GEX tell options traders?
- GEX is a regime indicator: positive-gamma regimes favor mean-reverting strategies (premium-selling near established ranges); negative-gamma regimes favor momentum and breakout strategies. The same options-strategy structure can be appropriate or inappropriate depending on the dealer-gamma regime, so reading the sign and magnitude of net GEX before sizing positions is standard practice.