Notable Tuesday Option Activity: SOFI, KMX, KEX

Significant options flow hit CarMax (KMX) and Kirby Corp. (KEX) today: KMX saw 20,138 contracts (~2.0M underlying shares), roughly 45.1% of its one‑month ADV (4.5M), led by 8,829 contracts in the $55 call expiring April 17, 2026 (~882,900 shares). KEX traded 3,047 contracts (~304,700 shares), about 43.2% of its one‑month ADV (705,395), concentrated in 2,004 contracts of the $100 put expiring Feb 20, 2026 (~200,400 shares). These concentrated option trades may reflect directional bets or hedging and could temporarily affect liquidity and implied volatility in the respective underlyings.

Analysis

Market structure: The concentrated options flows (KMX: 8,829 April 17, 2026 $55 calls ≈882,900 shares; KEX: 2,004 Feb 20, 2026 $100 puts ≈200,400 shares) imply large directional bets or hedges that will force dealers to delta-hedge — likely creating near-term buying pressure in KMX and selling pressure in KEX. Winners are liquidity providers and short-dated directional players who can front-run gamma; losers are uninformed long-only holders if dealer hedging amplifies moves. Cross-asset effects are limited but expect elevated single-stock implied volatility, transient spillover into single-name CDS for KEX if downside conviction grows, and minimal FX/commodity impact.

Risk assessment: Tail risks include a forced squeeze if large call accumulation is followed by positive leaks/buyout chatter (KMX) or a corporate shock (earnings, dividend cut) triggering put exercise at KEX; both can create rapid >10-30% moves in days. Immediate (0–7 days): dealer gamma trading will dominate; short-term (weeks–months): IV re-pricing and earnings/outlook will matter; long-term (quarters): fundamentals (used-car price trends for KMX, fuel/industrial demand for KEX) reassert. Hidden dependencies: block options may be hedges for structured products or M&A — not pure directional bets — so interpret flow with caution. Key catalysts: earnings dates, consumer auto demand prints, inland barge/fuel data, and changes in open interest >50% week-over-week.

Trade implications: Prefer defined-risk, calendar-aware option spreads rather than naked exposure. Direct plays: tactical bullish exposure to KMX via Apr-2026 55/65 call spreads to capture dealer-driven lift while capping premium; tactical bearish exposure to KEX via Feb-2026 100/85 put spreads to exploit put-driven downside pressure. Pair trade: long KMX call spread vs short KEX (or long KEX puts) to neutralize market beta and express relative conviction. Entry window: act within 1–10 trading days to capture gamma-induced moves; trim 50% after 30–60% realized gain or IV mean-reversion.

Contrarian angles: The flow may be overstating conviction — large block buys can be option-financed corporate strategies (employee comp, convert hedges) not pure directional bets. Reaction may be overdone if market makers hedge mechanically; mean reversion in IV can punish naked buyers. Historical parallels: single-stock gamma squeezes (e.g., past heavy call clusters) produced short-lived rallies followed by retracement once open interest stabilizes. Unintended consequence: chasing calls on KMX without spread protection risks >50% premium loss if the dealer unwinds hedges abruptly.

Key Decisions for Investors

• Establish a defined-risk bullish position in KMX: buy Apr 17, 2026 55/65 call spread, allocate 1–3% of portfolio notional, pay target premium ≤$2.50; set stop at 50% premium loss and take profits by trimming 50% at 30–60% P&L.
• Initiate a tactical bearish position in KEX: buy Feb 20, 2026 100/85 put spread, allocate 0.5–1.5% of portfolio notional, accept full premium as max loss; scale in over 3 tranches if IV rises >15% pre-entry.
• Execute a relative-value pair: long KMX Apr-2026 55/65 call spread vs long KEX Feb-2026 100/85 put spread sized 1:1 notional to neutralize market beta; target combined return 30–80% by expirations, reassess at 60 days.