Notable Monday Option Activity: Z, APPN, SIRI

Options activity in Appian Corp (APPN) and SiriusXM Holdings (SIRI) was unusually heavy: APPN saw 13,687 contracts trade (about 1.4 million underlying shares), roughly 184.1% of its one-month average daily volume, led by 13,411 contracts in the $30 put expiring Feb. 20, 2026 (≈1.3 million shares). SIRI registered 42,581 contracts (≈4.3 million shares), or about 117.6% of its one-month average, with 10,054 contracts in the $23.50 call expiring Dec. 19, 2025 (≈1.0 million shares). The concentrated, long-dated put flow in APPN and large call flow in SIRI suggest significant directional bets or hedging activity that could amplify moves in the underlying stocks given the volumes relative to average daily trading.

Analysis

Appian Corp (APPN) experienced concentrated options activity with 13,687 contracts traded today — approximately 1.4 million underlying shares or 184.1% of APPN’s one‑month average daily volume of 743,635 shares — led by 13,411 contracts in the $30 put expiring February 20, 2026 (≈1.3 million shares). SiriusXM (SIRI) registered 42,581 contracts (~4.3 million underlying shares), about 117.6% of its one‑month average daily volume of 3.6 million shares, driven by 10,054 contracts in the $23.50 call expiring December 19, 2025 (≈1.0 million shares).

The APPN flow is concentrated in a long‑dated put strike, which is consistent with sizable bearish directional bets or collateralized hedging that could raise implied volatility and create downside pressure if flows are buy‑to‑open; the SIRI flow is concentrated in a long‑dated call strike, consistent with bullish positioning or corporate‑event speculation that could amplify upside moves. Market impact appears idiosyncratic rather than systemic (market impact score ~0.25), but both flows materially exceed daily share volumes and could affect short‑term liquidity and volatility in the underlyings.

Interpretation is limited by lack of trade flags (buy/sell to open, spreads versus single‑leg trades). Investors should therefore monitor changes in open interest, intraday price reaction, implied volatility, and put/call ratios before inferring sustained directional conviction or adjusting exposure.

Key Decisions for Investors

• For APPN, consider trimming exposure or buying targeted downside protection (puts) and monitor put open interest and implied volatility for confirmation of sustained bearish positioning
• For SIRI, validate trade intent (buy‑to‑open vs. sell) before initiating exposure; if bullish conviction is confirmed, consider defined‑risk call strategies or spreads rather than naked longs given large option volume
• Require confirmation from changes in open interest, IV spikes, and underlying price reaction before materially resizing positions, and size any trades conservatively as these option flows exceed average daily share volume