Investors already reward EU Taxonomy alignment

Markets are signaling a preference for real green revenues over policy talk

Good things are coming from the top of legislation. Image generated with Leonardo AI

For years, sustainability- and ESG ratings have promised to tell investors which companies are “doing good.” But the evidence has always been shaky: rating agencies disagree wildly, and their scores often reward glossy disclosures more than actual business fundamentals.

A study published earlier this year in the Journal of Banking & Finance cuts through the noise. It shows that markets don’t really care about ESG scores anyway. What they do reward is alignment with the EU Taxonomy, i.e., the European Union’s rulebook defining which economic activities truly count as green.

The researchers find that companies with higher shares of Taxonomy-aligned revenues earned systematically higher returns. Interestingly, this “alignment premium” emerged even before the regulation formally took effect!

By contrast, ESG ratings had no explanatory power, say the study authors. Furthermore, when attention to the Taxonomy spiked through news coverage or Google searches, that “alignment premium” they found grew even stronger.

That’s the story that this article unpacks: why ESG ratings never delivered, how the Taxonomy is already reshaping markets, and why this shift opens the door for a new wave of analytics — from granular revenue tracking to causal analysis linking sustainability with financial outcomes.

ESG Ratings Were Always Broken

For more than a decade, ESG ratings have been the default shorthand for investors trying to identify “sustainable” companies. The problem is that these ratings rarely agree with each other. A company might score highly with one provider and poorly with another, not because of new information but because each agency uses its own proprietary definitions, weightings, and indicators.

This inconsistency has real consequences. Ratings often reward companies for disclosing policies — say, announcing a carbon-reduction target — regardless of whether those policies are implemented or whether the company’s actual business activities change. In other words, firms can earn better ESG scores by being better communicators, not necessarily by being more sustainable.

Academic studies have called out these flaws for years, highlighting the weak correlation between ESG ratings and actual financial performance. Investors themselves have grown skeptical, increasingly aware that ESG ratings are sometimes nothing more than “greenwashing by spreadsheet.”

Against this backdrop, the EU Taxonomy stands out because it doesn’t grade firms on policies or PR. It measures revenues from specific economic activities and tests them against detailed technical criteria. It’s an attempt by legislators to solve the problem that ESG rating agencies never could, because the latter weren’t properly incentivized to maintain consistency, comparability, and credibility.

The Taxonomy Premium Is Real

What happens when you swap vague ratings for hard numbers? Markets respond!

The aforementioned study by Alexander Bassen and colleagues finds that firms with a higher share of EU Taxonomy–aligned revenues earned systematically higher returns. A one–standard deviation increase in alignment translated into roughly 30 basis points of extra monthly performance, even after adjusting for risk factors.

In plain English: companies that made more of their money from genuinely green activities were rewarded with higher valuations.

The effect showed up not just in long-run regressions but also in the market reaction when the Taxonomy was officially published. On that day, firms in the top quintile (i.e. in the top 20% of firms) in terms of Taxonomy-alignment earned abnormal returns of +0.66%, while those at the bottom quintile lost –0.67%. Regulation acted like an earnings surprise — separating winners from losers in real time.

Crucially, none of this could be explained by traditional ESG ratings. The supposed “ESG premium” was nowhere to be found. Only Taxonomy alignment — revenues tied to real activities — showed predictive power.

So, dear investors, hear this: the market has already started pricing sustainability the way regulators define it, not the way rating agencies score it.

The Power of Attention

Markets don’t just move on data. No matter what the trading algorithms are, ultimately markets are a symptom of human consciousness. As a result, they move on whatever investors pay attention to.

The researchers of the study tested this by tracking Google searches for “EU Taxonomy” and counting media articles about it. And the results were quite striking: the alignment premium grew stronger, significantly, in months when the Taxonomy was in the news.

In other words, the effect wasn’t static. Investors rewarded green revenues most when they were actively thinking about the rules defining them. When attention spiked, capital reallocation toward Taxonomy-aligned firms accelerated.

This fits a broader pattern in financial markets. Information doesn’t drive prices on its own; it has to pass through the lens of investor awareness. News cycles, search trends, and the narratives that dominate headlines can all amplify or dampen how fundamentals are priced in.

For sustainability, this means regulation doesn’t just change disclosure requirements — it shapes the stories investors tell themselves about what matters. And once that narrative shifts, it can reprice entire sectors almost overnight.

Wangari’s Opportunity

The EU Taxonomy is not really a constraint; rather, it’s a catalyst. It has already started raising the quality of reporting data, sharpened incentives, and given investors a common language. Most importantly, it ies sustainability to revenues from clearly defined activities.

This is an opportunity, because firms that can show higher Taxonomy alignment are now earning a return premium, and investors who track it are reallocating capital in real time.

What’s next for corporates and investors? In my view, they need to start addressing not just what happened (which can be done by, say, automating Taxonomy-compliant reporting), but why it happened and what that means financially. My firm is currently working with some big-name financial institutions to develop just that.

Instead of treating ESG as a side note, our approach traces how and why specific environmental factors ripple through revenue, cost of capital, risk exposures, and ultimately valuation. (This sounds like a shameless plug, and it is!)

Our level of detail matters because it changes real behavior. After all, what actions can you take from getting a bumper-sticker A or F score in ESG? On the other hand, knowing that your carbon emissions have real consequences for your stock prices will make you take action.

This is what we envision: Asset managers sharpening their bets. Banks can stress-testing loan books for real sustainability-linked risk. And corporates identifying which activities generate the dual dividend: returns for shareholders and progress toward planetary goals.

We see a huge market opportunity here. There’s little talent that knows how to straddle sustainability, finance, and data science (including causal inference, which to us seems like a huge opportunity). Wangari is at that intersection, and, though it’s taken a bit of time to develop, we’re starting to see how this is indeed delivering real value.

The Bottom Line: Real Sustainability Drives Real Cash Returns

The findings from this study point to a turning of the tide. For years, ESG ratings shaped headlines but not balance sheets.

The EU has always been pioneering in its legislation (see GDPR or the upcoming AI Act for examples). The EU Taxonomy is clearly another big milestone in groundbreaking legislation. It puts the finger right on the problem; by tying sustainability to measurable revenues and precise technical criteria, it has given investors a harder, cleaner signal — which the markets have already (!) rewarded with real cash returns.

The consequences ripple far beyond Europe. If the Taxonomy can move stock prices in advance of full enforcement, it signals that the market appetite for verifiable sustainability data is only going to grow.

Greenwashing is so 2010s… Investors are no longer satisfied with green promises; they want to know what portion of a company’s revenues is genuinely aligned with the transition to a low-carbon economy. Because, in a world of real planetary boundaries, that’s the portion of revenue that actually can grow.

This situation creates both a challenge and an opportunity. The challenge is for companies, who will find it harder to skate by on glossy ESG reports. (Too bad!) The opportunity lies with analytics: firms that can go deeper than a bumper-sticker score, disentangling cause from correlation and showing exactly how sustainability connects to financial performance.

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Reads of the Week

• This week’s Sustainability Roundup has a hot take: Google is quietly backpedaling on its net-zero pledge! AI emissions are surging, raising critical questions about tech’s true climate impact. With fresh insights on paradox theory, Unilever’s “purpose-led growth,” and AI-powered ESG leadership, the piece challenges organizations to rethink sustainability as a dynamic, tension-driven strategy for long-term value.

• This edition of Investing Lawyer makes a compelling case for ditching risky “moonshot” investments in favor of building a steady income portfolio through dividend investing. The piece argues that true financial freedom isn’t about massive wealth—but consistent cash flow that covers your expenses and gives you back control of your time. (I’ve seen plenty such takes over the past few years, but this one actually has substance and isn’t one of those clickbait pieces.)

• This Systematic Investing post is a deep dive into how to design ranking systems (these are not dumb scores!) for stock selection, balancing academic rigor with practical strategy. It emphasizes equal-weighting as a robust baseline to avoid overfitting, while acknowledging room for nuanced adjustments like machine learning or personal conviction. Importantly, it encourages smaller investors to take advantage of “uncrowded” spaces—like microcaps—where big players can’t compete, turning size into an edge rather than a limitation. A great complement, in my opinion, to an ETF-powered income portfolio like Investing Lawyer (see point above) suggests!