Regions of the HST spectra where the blueshifted Lyα counterparts of the X-ray UFOs (Paper I) would be expected. In each panel, the region highlighted in yellow between the vertical dotted lines corresponds to the velocity uncertainty of the X-ray UFO. The significant UV absorption features are labeled. The ISM lines are labeled in blue, IGM lines in green, and the intrinsic AGN absorption lines in magenta. No apparent UV counterparts to the X-ray UFOs are detected in the HST spectra. The intrinsic absorption lines in LBQS 1338-0038 (top-left panel) are from the warm absorber and have moderate velocities. The parameters of the AGN absorption lines are provided in Table A.2. We note that for three of the objects with X-ray UFO in Paper I, the UV counterpart cannot be checked and thus are not included in this figure: the heavily reddened 2MASS J10514425+3539306 and 2MASS J16531505+2349427 do not have any HST UV spectra, and in the case of PG 0947+396, the potential Lyα counterpart of the X-ray UFO would fall outside the detection range of the HST data.