Zillow Group (Z) (ZG) is having one of those frustrating moments where the underlying business is actually getting better, but investors can't quite see through the fog. Shares crashed 18.11% Wednesday to $44.80, marking a fresh 52-week low, after the company reported fourth-quarter results that showed improving fundamentals clouded by rising legal costs and competitive uncertainty.

Needham analyst Bernie McTernan maintained his Hold rating following Tuesday's earnings release, trimming his 2026 estimates by just 1% while acknowledging the story has gotten complicated. The core issue? Strip away the legal expenses, and Zillow would be showing meaningful margin improvement right now. But those costs aren't going anywhere soon, and a new competitive threat is emerging that's hard to quantify.

The Margin Mystery

Here's what's actually happening with Zillow's profitability. McTernan estimates the company is running around 50% incremental margins in 2025 when you exclude legal expenses. That's solid. But throw those legal costs back in, and margins drop to the 30-40% range, which is where they've been stuck for three straight years now.

The good news is that this should be temporary. McTernan expects legal costs to start declining year over year by 2027, which could push incremental adjusted EBITDA margins up to around 60%. That would bring Zillow back to the profitability profile it enjoyed before its ill-fated iBuying adventure, positioning it nicely for any housing market recovery.

And about that housing recovery: McTernan sees it as the biggest potential catalyst for revenue growth, though he expects it to unfold gradually rather than snap back in a single year. His current model assumes revenue growth decelerates from 16% in 2026 to 11% in 2027, but any stronger performance would likely flow through to higher earnings given the company's fixed-cost leverage.

The Private Listing Problem

Then there's the competitive wildcard that's got everyone nervous. Private listing networks are still tiny, accounting for less than 1% of total listings according to Zillow's management. But McTernan thinks this battle is just getting started.

Zillow did win a preliminary injunction that blocked the next phase of Compass Inc. (COMP) marketing strategy around private listings. That sounds like good news, except Compass just acquired Anywhere Real Estate Inc. (HOUS), massively expanding its brokerage footprint. The competitive landscape is shifting, and while the immediate revenue impact appears minimal, the structural uncertainty is real.

McTernan's concern isn't necessarily that private networks will crush Zillow's business tomorrow. It's that this uncertainty could keep a lid on the stock's valuation multiple even as the fundamentals improve. Investors don't love unknowns, especially when they involve powerful competitors potentially changing the rules of the game.

What the Numbers Say

Fourth-quarter adjusted EBITDA came in 2% below McTernan's expectations, driven by weaker margins. First-quarter guidance was even softer, missing his projections by 5%, primarily due to higher costs including those persistent legal expenses. Yet he only trimmed his full-year 2026 estimates by 1%, suggesting he expects performance to improve in the second half of the year.

So you've got a company with improving operating leverage, positioned to benefit from a housing recovery, but weighed down by legal bills and facing competitive threats that are hard to quantify. McTernan's Hold rating basically says: the upside is there, but so are the risks, and right now they're roughly balanced.

For investors, the question is whether you believe Zillow can navigate the competitive challenges while legal costs normalize and housing recovers. If all three things break right, the stock could have meaningful upside from these 52-week lows. But that's a lot of moving parts, which explains why the market is staying cautious for now.