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We present new measurements of cosmic microwave background (CMB) lensing over$9400$ sq. deg. of the sky. These lensing measurements are derived from theAtacama Cosmology Telescope (ACT) Data Release 6 (DR6) CMB dataset, whichconsists of five seasons of ACT CMB temperature and polarization observations.We determine the amplitude of the CMB lensing power spectrum at $2.3\%$precision ($43\sigma$ significance) using a novel pipeline that minimizessensitivity to foregrounds and to noise properties. To ensure our results arerobust, we analyze an extensive set of null tests, consistency tests, andsystematic error estimates and employ a blinded analysis framework. Thebaseline spectrum is well fit by a lensing amplitude of$A_{\mathrm{lens}}=1.013\pm0.023$ relative to the Planck 2018 CMB power spectrabest-fit $\Lambda$CDM model and $A_{\mathrm{lens}}=1.005\pm0.023$ relative tothe $\text{ACT DR4} + \text{WMAP}$ best-fit model. From our lensing powerspectrum measurement, we derive constraints on the parameter combination$S^{\mathrm{CMBL}}_8 \equiv \sigma_8 \left({\Omega_m}/{0.3}\right)^{0.25}$ of$S^{\mathrm{CMBL}}_8= 0.818\pm0.022$ from ACT DR6 CMB lensing alone and$S^{\mathrm{CMBL}}_8= 0.813\pm0.018$ when combining ACT DR6 and Planck NPIPECMB lensing power spectra. These results are in excellent agreement with$\Lambda$CDM model constraints from Planck or $\text{ACT DR4} + \text{WMAP}$CMB power spectrum measurements. Our lensing measurements from redshifts$z\sim0.5$--$5$ are thus fully consistent with $\Lambda$CDM structure growthpredictions based on CMB anisotropies probing primarily $z\sim1100$. We find noevidence for a suppression of the amplitude of cosmic structure at lowredshifts

The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and its Implications for Structure Growth