XBI call volume above normal and directionally bullish
Options flow in the S&P Biotech ETF (XBI) shows an unusually large, call-heavy premium payload — total premium hit $949,576.10 (100th percentile) with concentrated, ask-side sweep activity skewed toward calls.
Options activity in XBI on 2026-06-04 flagged for its size and directional concentration. Total options volume reached 1,695 contracts with call volume of 1,152 versus put volume of 543 (put/call volume ratio 0.47). More striking was total premium of $949,576.10 — a premium_vs_average multiple of 2.6 and a total_premium_percentile reading of 100.0 — with $669,931.10 of that paid into calls versus $279,645.00 into puts (put_call_premium_ratio 0.42). The directional_premium_ratio of 0.706 and directional_volume_ratio of 0.68 indicate roughly 70% of traded premium and 68% of contract volume leaned call-side.
Several execution markers support that the flow was high-quality buying pressure rather than balanced churn. The ask_side_premium_ratio was 0.951 and the sweep_block_premium_ratio was 1.556, indicating a large share of premium printed on the aggressor/ask side and an elevated proportion of sweep or block-sized premiums. Same-side tape showed 6 trades across 3 contracts totaling $669,931 in call premium with a single trade as large as $295,820. Same-side metrics also show average_abs_delta of 0.62 and average_iv_pct of 29.48 for those trades, with min_dte 1 and max_dte 106, indicating concentrated bets across short- and longer-dated calls.
Activity concentrated in a handful of strikes. The most active call contract was the 135.0 strike expiring 2026-09-18 with 489 contracts and $474,281 in premium (average_abs_delta 0.55, average_iv_pct 31.98). Nearer-term call activity included 464 contracts in the 133.0 strike expiring 2026-06-05 (total_premium $46,400, average_abs_delta 0.41) and 199 contracts in the 128.0 strike expiring 2026-06-18 (total_premium $149,250, average_abs_delta 0.82). There was also a concentrated put block at the 128.0 strike expiring 2026-08-21 (543 contracts, $279,645 total premium, average_abs_delta 0.34), underscoring that while today’s flow skewed bullish, there is isolated put interest on longer-dated strikes.
Context and risk framing: XBI itself traded at $133.70, up $3.87 (2.98%) on the day with equity volume 1,008,181. Implied volatility sits at moderate levels (average_iv_pct 30.41; iv30_pct 32.47, iv_percentile 45.1) and the market’s 30-day expected move is about 1.97% ($2.63). Average option spread was 7.79%, a reminder that execution cost and liquidity vary. The size, call concentration, high premium percentile, ask-side/sweep signatures, and tight set of active contracts collectively mark this as notable, directional flow rather than routine volume. No earnings date was listed in the snapshot.