Just three of the companies planning to go public last week managed to squeeze in their IPOs before the third quarter came to a close.

GlobeImmune  -- the Colorado-based biotech that bumped its deal two weeks ago to last week -- is hoping to get its 5 million shares sold this week.

It's one of the nine companies looking to go public this week. Some of the names that you may know include identity theft protection leader LifeLock and the once public Dave & Busters eatertainment chain.

However, let's look at the three companies that did begin trading last week.

Company IPO Sept. 28, 2012 Gain
Summit Midstream  (NYSE: SMPL) $20 $21.11 6%
Qualys  (Nasdaq: QLYS) $12 $14.16 18%
Santander Mexico  (NYSE: BSMX) $12.18 $13.70 13%

Source: The Wall Street Journal.

Summit Midstream Partners owns and operates roughly 385 miles of natural-gas-gathering pipeline and another approximately 150,000 horsepower of compression. Qualys is a provider of online network security. Santander Mexico pulled off a beefy $4 billion offering.

All three debutantes managed to close out the week above their IPO prices. Sure, the pops weren't as buoyant as the one that online real estate portal Trulia received a week earlier, but it's not a bad week for the market's newbies when they go 3-for-3 in avoiding the busted IPO trap.

This week will be even more interesting, but that will also mean a few losers creeping in among the winners.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.