Pinterest Inc. (PINS) delivered a third-quarter report card after Thursday's closing bell that investors clearly didn't love. The company missed on both the top and bottom lines, and the stock took a nearly 10% haircut in after-hours trading.

The Numbers That Matter

Revenue came in at $1.17 billion, short of the $1.21 billion analysts were looking for, according to market data. Adjusted earnings landed at 46 cents per share, also below the 48-cent estimate.

Here's the frustrating part for anyone bullish on Pinterest: engagement is actually thriving. Global monthly active users jumped 10% year-over-year to an all-time high of 661 million. Total revenue grew 12% year-over-year. Average revenue per user was $1.80 globally and $8.38 in the U.S. and Canada.

The company also generated $316 million in net cash from operations and $300 million in free cash flow, exiting the quarter with roughly $654.34 million in cash and cash equivalents.

So users are showing up. The monetization engine just isn't humming quite as loudly as Wall Street hoped.

What the CEO Is Saying

CEO Bill Ready struck an optimistic tone in the release, pointing to the platform's AI capabilities.

"Our differentiated AI-driven visual search and shopping experiences are making Pinterest increasingly valuable for users and advertisers alike," Ready said.

He added: "We are focused on sharpening our execution, scaling our performance advertising solutions, and building an ecosystem that captures high-intent discovery and converts it into durable, long-term growth."

That's the pitch. Now the market wants to see it translate into revenue beats.

The Guidance Disappointment

Perhaps the bigger gut punch came from the forward outlook. Pinterest sees fourth-quarter revenue in the range of $1.43 billion to $1.48 billion, versus estimates of $1.52 billion. The company anticipates adjusted EBITDA of $538 million to $588 million in the fourth quarter, compared to $339 million in the third quarter.

That guidance gap is likely doing most of the damage to the stock. When a growth company misses and then guides below consensus, investors tend to head for the exits.

Management was discussing the quarter on an earnings call that started at 4:30 p.m. ET.

Where the Stock Stands

Pinterest shares were down 9.69% in Thursday's after-hours session, trading at $17.99 at the time of publication, according to market data.

The takeaway? Pinterest has a compelling user growth story and a CEO who believes AI-driven shopping is the future. But right now, the market is focused on the revenue miss and the soft guidance. Until the monetization catches up to the engagement, the stock may stay under pressure.