Noteworthy Tuesday Option Activity: ES, SPHR, ALGM

Unusual options activity in Sphere Entertainment (SPHR) and Allegro MicroSystems (ALGM) shows concentrated, long-dated put flows: SPHR traded 4,165 contracts today (≈416,500 underlying shares, about 55.3% of its one‑month average daily volume), led by 1,066 contracts in the Jan 16, 2026 $80 put (≈106,600 shares); ALGM printed 9,075 contracts (≈907,500 shares, ~52.3% of its one‑month average), almost entirely in the Jan 16, 2026 $20 put (9,000 contracts, ≈900,000 shares). These sizable put positions represent meaningful hedging or directional bearish interest and could affect implied volatility and liquidity in both stocks, so traders and risk desks should monitor follow‑through in the underlying shares and option markets.

Analysis

Options markets printed concentrated, long-dated put activity today in Sphere Entertainment (SPHR) and Allegro MicroSystems (ALGM). SPHR saw 4,165 contracts transacted (≈416,500 underlying shares), equal to ~55.3% of its one‑month average daily volume of 753,705 shares, led by 1,066 contracts in the Jan 16, 2026 $80 put (≈106,600 shares). ALGM printed 9,075 contracts (≈907,500 underlying shares), about 52.3% of its one‑month average daily volume of 1.7 million shares, with 9,000 contracts in the Jan 16, 2026 $20 put (≈900,000 shares).

The concentration in single strikes and the long-dated January 2026 expiries suggests either sizeable directional bearish bets or large hedges rather than routine retail flow; the provided sentiment outputs are mildly negative for both tickers (SPHR -0.4, ALGM -0.5) and the market impact score (0.28) implies meaningful but not market‑moving pressure absent follow‑through. Such flows are likely to lift implied volatility, tighten or distort bid/ask spreads at those strikes and can influence price discovery if position holders hedge in the underlying.

Investors should treat this as flow data rather than fundamental news: monitor option open interest and IV term structure for persistence, watch underlying share reaction for confirmation, and account for possible liquidity and execution risk when adjusting positions given the size of the put equivalents relative to average volumes.

Key Decisions for Investors

• Monitor SPHR and ALGM underlying prices, option implied volatility and open interest for follow‑through before taking new directional positions
• If you hold material long exposure to either name, consider reducing net exposure or adding downside protection given concentrated long‑dated put demand equal to roughly half of average daily volume