$ In the "perform scenario" you liquidate the portfolio at $t_1$ realising its PnL (allow me to simplify the notation a tiny bit) Vega and Theta are sensetivities to volatility and time, respectively, so their contribution can be: $begingroup$ For an option with price $C$, the P$&$L, with regard to https://pnl24457.buyoutblog.com/34086414/pnl-options