Shark Tank and Supernatural were each adjusted up a tenth while Primetime: Who Do You Thhink You Are was adjusted down a tenth among adults 18-49versus Friday’s preliminary ratings.
Final broadcast primetime ratings for Friday, May 18, 2012:
| Time | Net | Show | 18-49 Rating | 18-49 Share | Viewers Live+SD (million) |
| 8:00PM | ABC | Shark Tank | 1.6 | 6 | 5.520 |
| NBC | Who Do You Think You Are? | 1.0 | 4 | 5.380 | |
| CBS | Undercover Boss -R | 0.8 | 3 | 4.260 | |
| FOX | Kitchen Nightmares -R | 0.8 | 3 | 1.920 | |
| CW | Nikita | 0.4 | 2 | 1.420 | |
| 9:00PM | NBC | Grimm | 1.6 | 5 | 5.100 |
| ABC | Primetime: What Would You Do? | 1.1 | 4 | 4.270 | |
| CBS | CSI: NY -R | 0.8 | 3 | 5.700 | |
| FOX | Kitchen Nightmares- R | 0.8 | 3 | 2.040 | |
| CW | Supernatural | 0.7 | 2 | 1.560 | |
| 10:00PM | ABC | 20/20 | 1.2 | 4 | 4.410 |
| NBC | Dateline NBC | 1.1 | 4 | 4.640 | |
| CBS | Blue Bloods -R | 0.9 | 3 | 6.660 |
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Nielsen TV Ratings: ©2012 The Nielsen Company. All Rights Reserved.
