Oral title: Transmission Spectroscopy from the ground with Magellan Oral abstract: One of the most exciting possibilities allowed by transiting exoplanets is the ability of probing their atmospheres through transmission. For the last few years we have been carrying out a ground-based transmission spectra survey called ACCESS using the Magellan telescopes in Chile. I will briefly describe the survey, its results so far, and prospects for the TESS era.