How might the dual listing affect the stock's volatility in the short term?

The addition of a parallel market on NYSE Texas will likely raise short‑term volatility for NSP, but the effect should be modest and short‑lived. Dual‑listing creates an extra venue for order flow, which can produce momentary “micro‑price gaps” as market‑makers and algorithmic traders test relative liquidity between the two order books. In the first few trading sessions you may see wider bid‑ask spreads and occasional price divergences of a few basis points, especially during the opening of the Texas market (which trades on a fully electronic platform with its own latency profile). That imbalance usually resolves quickly as arbitrageurs arbitrage any price disparity, but the initial period can generate extra intraday swing‑room that day‑traders love.

Fundamentally nothing about Insperity’s business has changed—its earnings, cash flow and HR‑services positioning remain unchanged—so any volatility will be driven mainly by the mechanical impact of the new venue rather than new information. Technically, watch the near‑term VWAP on both exchanges; a breach of the combined VWAP accompanied by an uptick in volume on the Texas side can be a signal that the new liquidity pool is being absorbed, potentially prompting a short‑term pull‑back. A pragmatic trading plan would be to stay flat or use tight‑range straddles/iron condors around the current price until the dual‑listing settles, then re‑evaluate once spreads normalize and the market has fully integrated the two order books.