In a market where biotech usually gets lumped into either “future cure” or “eternal underdog,” GSK (GSK) is carving out a third category: cash-flowing, specialty-driven, and still misunderstood.
It’s not the hottest name in oncology. It’s not a dividend aristocrat either. But if you’re looking for where the next rerating in big pharma might come from, it might be time to revisit this London-based laggard.
The first thing to understand is that GSK has officially graduated from its identity crisis.
After years of being the kid at the pharma party who couldn’t decide if it wanted to be a vaccine powerhouse or a consumer health brand, it’s now firmly in the prescription drug camp, with a clear tilt toward specialty medicines.
And the numbers suggest that move wasn’t just branding. It’s starting to show up in the top line.
Specialty medicines grew 21% year over year in Q1 2025, led by HIV treatments and a newly invigorated oncology pipeline.
The HIV franchise, built around Dovato and Cabenuva, is fending off competition better than expected, while the oncology segment finally looks like it’s entering a growth phase.
Zejula is gaining traction, and Jemperli is carving out share in endometrial cancer, a notoriously tough field.
Not home runs, but they are base hits with upside.
Let’s also not ignore the sleeper: GSK’s vaccine segment. While it’s not the main story here, Arexvy, its RSV vaccine, is one of the few true breakout commercial launches we’ve seen in the past year.
Experts have been racing to raise sales forecasts, with some now expecting $3 billion in annualized revenue. Even if you ignore the COVID halo that still inflates comparisons, this is real, defensible growth.
GSK’s new CEO, Emma Walmsley, has also quietly turned into a capital allocator with teeth.
The ViiV Healthcare HIV joint venture continues to be a cash machine, and GSK has guided for an impressive 10% to 12% annual EPS growth through 2026.
That’s not wishful thinking. These numbers are built on volume growth, margin expansion, and steady pipeline progress.
And yet the stock trades at just 9.7 times forward earnings. That’s not a typo. In a world where even troubled pharma names like Pfizer (PFE) get 11–12 times and growthier peers like Gilead (GILD) are creeping up near 13, GSK still looks like it’s being priced as if Brexit negotiations are ongoing and Advair just went off patent.
Some of this is because of geography.
US investors still hesitate when a name trades in pounds and files reports from Brentford. But a lot of it is just old narratives refusing to die.
The market still remembers GSK as a sluggish, dividend-obsessed consumer health hybrid. It hasn’t yet caught up to the fact that this is now a focused, specialty-driven pharma company with legitimate upside drivers.
Compare this to Shionogi (SGIOY), the Japanese firm riding a wave of infectious disease revenues, or even Sanofi (SNY), which has pivoted hard into immunology.
GSK sits in the middle – cheaper than both, but arguably with just as much growth potential in a narrower field.
And with cash flow from its consumer spin-off Haleon (HLN) still providing optionality, GSK doesn’t need to stretch its balance sheet to compete.
There are risks, of course.
GSK is still defending patent positions in HIV. Its oncology program, while promising, lacks the kind of breakout star that grabs headlines.
And regulatory scrutiny in the UK and EU can be an unpredictable drag. But with a pipeline that’s actually working and a valuation stuck in neutral, the setup is hard to ignore.
This is where patient biotech investors can earn their edge.
GSK is not going to triple in 12 months or invent the cure for everything. But it could rerate to a 12–13x multiple, especially if Arexvy delivers on projections and oncology stops being a drag.
That would put the stock north of $50, with dividends pushing the total return closer to 20 percent over the next 18 months. Not fireworks, but not dead money either.
In short, this is the part of the cycle where you look for quality hiding in plain sight.
The market is still obsessed with obesity and GLP-1s. Meanwhile, GSK is building a specialty pharma engine that throws off cash, rewards shareholders, and still flies under the radar.
And in biotech, being early to the rerating is usually better than being last to the moonshot.
You’re not buying hype here. You’re buying execution – quiet, compounding, undervalued execution.
And in this market, that’s starting to look pretty rare.