Reality veterans “Big Brother” on CBS and “America’s Got Talent” on NBC were the most popular programs among young adults on Wednesday, a night that saw CBS rookie drama “Extant” stabilize as it moved to its new, later timeslot. Over at CW, magic series “Penn & Teller: Fool Us” opened at the high end of the network’s summer ratings range.

CBS and NBC tied for the night’s 18-49 lead, with the Peacock leading outright in total viewers, according to preliminary “live plus same-day” Nielsen estimates.

For CBS, “Big Brother” (2.2 rating/9 share in 18-49, 6.5 million viewers overall) was down a smidge from last week, winning its hour in key demos as well as total viewers and tying “America’s Got Talent” as Wednesday’s No. 1 program in 18-49. A repeat “Criminal Minds” (1.1/4 in 18-49, 4.7 million viewers overall) followed, matching last week’s “Extant” score in 18-49. And in its new 10 p.m. time period, the Halle Berry drama ” (1.1/4 in 18-49, 5.9 million viewers overall) matched its week-ago demo deliveries, winning among the major networks in 18-49 (tie), 25-54 (1.6/4) and total viewers.

NBC followed a repeat “America’s Got Talent” (1.2/5 in 18-49, 6.3 million viewers overall) with an original episode (2.2/7 in 18-49, 10.6 million viewers overall), which was the night’s top program in 18-49 (tie), 25-54 (2.9/8) and total viewers. As the show shifted to its results-show stage, Wednesday’s hour was lower-rated than last week’s two-hour averages, but that didn’t seem to affect 10 p.m. first-year drama “Taxi Brooklyn” (1.1/4 in 18-49, 5.6 million viewers overall), which appears to be up a tick from last week for its best score to date. (It also did a 1.1 in the prelims last week, though it looks like it has a better shot of holding at that number this week.)

“Taxi” has performed well enough to think it could be back next year at the Peacock, which has already renewed fellow first-year summer drama “The Night Shift” for a second season.

At CW, the series premiere of “Penn & Teller: Fool Us” (0.5/2 in 18-49, 1.8 million viewers overall) did reasonably well, pulling nearly the rating that its top summer show, “Whose Line Is It Anyway,” did with its most recent original episode (0.6). Among all CW summer premieres to date, only last year’s “Whose Line” has drawn a larger overall audience.

Fox’s two-hour “So You Think You Can Dance” (1.1/4 in 18-49, 3.5 million viewers overall) was on par with last week.

ABC aired repeats of comedies “The Middle” (0.9/4 in 18-49, 4.1 million viewers overall), “The Goldbergs” (0.9/4 in 18-49, 3.5 million viewers overall), “Modern Family” (1.0/3 in 18-49, 3.6 million viewers overall) and another “Middle” at 9:30 (1.0/3 in 18-49, 3.3 million viewers overall). Original drama “Motive” closed the night (0.7/2 in 18-49, 3.5 million viewers overall), up a tenth from its series low of last week.

Preliminary 18-49 averages for the night: CBS and NBC, 1.5/5; Univision, 1.3/5; Fox, 1.1/4; ABC, 0.9/3; Telemundo, 0.5/2; CW, 0.3/1.

In total viewers: NBC, 7.5 million; CBS, 5.7 million; ABC, 3.6 million; Fox, 3.5 million; Univision, 3.3 million; Telemundo, 1.3 million; CW, 1.2 million.