Best carbon accounting software for Nasdaq Metrio customers after the osapiens acquisition

The short answer: on August 19, 2026, osapiens announced it had acquired the Nasdaq Metrio platform and its customers, and Nasdaq now carries a banner announcing the sale on its own Metrio product pages. No migration date has been published. If your carbon inventory lives in Nasdaq Metrio you have three real options: move with the platform to the osapiens HUB, switch to a vendor you choose yourself, or rebuild the inventory from your own accounts payable ledger. Which one is right depends on whether you also have EU obligations, how much of your footprint is Scope 3, and whether your first California SB 253 report is due on November 10, 2026.

This is written for a US sustainability, finance or compliance lead whose company reports through Nasdaq Metrio and who now has to plan a reporting cycle around an acquisition nobody has given a date for. Everything below about Nasdaq and osapiens comes from the two companies' own product pages and the August 2026 release. No prices appear, because neither publishes one.

What did osapiens and Nasdaq announce?

osapiens said on August 19, 2026 that it had acquired the Nasdaq Metrio platform and its customers, and that the deal accelerates its expansion into the United States. Metrio customers move onto the osapiens HUB, which osapiens describes as a platform where "data can be collected once and reused across compliance requirements, supply chain regulations and carbon accounting initiatives." Michael Bartels, an SVP at Nasdaq, framed the sale as letting Nasdaq "focus on providing our listed and corporate clients with solutions in which we have unique expertise."

Some context helps. Nasdaq Metrio grew out of Metrio, the Montreal ESG data company Nasdaq agreed to buy on June 2, 2022, and Nasdaq built it into a sustainability reporting platform with more than 42,000 emission factors, guided workflows for CSRD, TCFD, California Climate Laws and ISSB, and a substantial approvals and audit-trail layer. osapiens is a Mannheim company with more than 2,500 customers, backed by a round led by the BlackRock and Temasek joint venture Decarbonization Partners. It is not a small vendor absorbing a large one. The full product-by-product comparison is on Nasdaq Metrio alternatives.

What the announcement does not tell you

An acquisition release is written for the market, not for the person who has to file. Four things that matter to you are missing from it.

When. No migration timeline was published. A month later the Nasdaq product pages were still live and still describing the Metrio engine, with only a banner pointing at the press release. You cannot plan a reporting year around a date nobody has given you, and the November 10 SB 253 filing will not wait.

How your history moves. A carbon inventory is more than totals. It is the activity data, the emission factor chosen for each source, the vintage of that factor, the boundary decisions and the evidence behind each figure. Nasdaq states 42,000 factors sourced primarily from Climatiq; osapiens states more than 250,000 screened on its carbon management suite. Two platforms with different factor libraries will not reproduce each other's numbers line for line. A base year you cannot reproduce is a base year you may have to restate, which is a disclosure event in itself.

What happens to the audit trail. Metrio's selling point was the machinery around the number: layered verification, role-based permissions, activity logs and a dedicated auditor access mode. Final figures usually migrate. Approvals, timestamps and attached supporting documents often do not. Ask specifically, because an assurance provider samples the evidence, not the total.

Which US rules the new platform covers. This is the one worth checking yourself. Nasdaq marketed Metrio to a North American base and named California Climate Laws among its workflows. When we read the osapiens site in September 2026 its "Regulations covered" navigation listed six regulations, all European: EUDR, PPWR, the Digital Product Passport, EUFLR, CSRD and CSDDD. California SB 253, SB 261 and the EPA Greenhouse Gas Reporting Program were not named there. Navigation lags product, and osapiens is clearly investing in the US, so this may already have changed. Get it answered in writing rather than assumed.

The three options, and who each one suits

There is no universally right answer here. There is a right answer for your company's obligations and the shape of your footprint.

Export your data before you decide anything

Whatever you choose, do this first, and do it while you still have a live login and an account manager who answers email. Leverage drops the moment a migration starts.

• Every year of activity data, at the most granular level the platform will give you, not summary totals.
• The emission factor applied to each source, with its source and vintage, so a number can be reproduced.
• Your organizational boundary and consolidation approach, and any documented exclusions.
• The approval history: who entered each figure, who approved it, and when.
• Supporting documents attached to data points, especially anything an auditor previously sampled.
• Your indicator definitions and calculation logic, which are the part nobody thinks to save.

Expect the result to be a pile of CSV files rather than one clean table: several years, several business units, facility names spelled three ways, units that changed halfway through, dates in two formats. Before any of it loads into a new platform it needs reconciling, and that work is faster in something built to dedupe and normalize messy spreadsheet exports than in a hand-built set of lookup formulas you will not be able to explain to an auditor in a year's time.

What is the best carbon accounting software for a Nasdaq Metrio customer?

The best replacement is the one that matches why you bought Metrio in the first place. If the disclosure document was the hard part and carbon was one chapter, the closest category is a reporting platform, and Workiva carbon accounting alternatives covers that decision. If you need enterprise carbon accounting with a large sustainability team behind it, compare Persefoni alternatives and Watershed alternatives. If site and energy data dominate your inventory, the comparison is IBM Envizi and Schneider Resource Advisor alternatives. The full field is mapped on best carbon accounting software.

And if your footprint is mostly Scope 3, the honest answer is that the category you need is different from the one you are leaving. Metrio's onboarding starts with a list of facility names, which tells you what the engine is built around. For most US companies outside heavy industry the biggest share of the inventory is purchased goods and services, which never appears on a meter. It appears in accounts payable as a vendor name, a GL code and a dollar amount, and turning that into a defensible number is a classification problem before it is a calculation problem. That is what we built: the classifier reads the AP or GL export you already produce and proposes a scope and one of the 15 Scope 3 categories per line with a stated reason and a confidence level, so a person reviews the uncertain tail rather than the whole file.

Is this a good moment to switch carbon accounting platforms?

Usually no, and right now yes. A platform change is expensive precisely because of switching costs: reimplementation, retraining, and the risk that your base year moves. An acquisition removes most of that argument, because the switching cost is being imposed on you anyway. You are choosing between a migration you did not pick and a migration you did, and only one of those ends with a platform that matches your actual obligations.

The timing argument is narrower than it looks, though. If your first SB 253 report is due on November 10, 2026, you have weeks, not quarters, and year one covers Scope 1 and Scope 2 only. Scope 3 follows in 2027. The sensible sequence is to get year one filed on whatever produces a defensible Scope 1 and 2 number, then use the remaining runway to fix the Scope 3 problem properly rather than doing both at once under a deadline. What the November filing actually requires is set out in SB 253 reporting software, and what it costs is in SB 253 compliance cost.

How much does Nasdaq Metrio cost, and will that change?

Nasdaq does not publish Metrio pricing and osapiens does not publish a price list either. Both route buyers to a demo request. What Nasdaq publishes instead is a modeled return: an estimated $497,000 in benefits over three years, including $223,000 saved on reporting preparation and $22,000 on audit and assurance reviews. Those are vendor projections for a large reporter, not an invoice.

Whether your own number changes is a contract question, not a product one, and it is the question most worth asking before renewal. osapiens sells the HUB as seven suites on a shared data foundation, which is a good model if you use several of them and a worse one if you only ever wanted carbon accounting. Ask whether the carbon module is purchasable standalone, which legal entity your next contract is with, and whether current terms carry across. How quotes are built across this category, and the drivers that actually move them, is on carbon accounting software cost.

What to do in the next two weeks

Send one email to your account manager asking for the migration date, the contracting entity, the export, and named US regulatory coverage. Pull the export whether or not they answer. Then decide on evidence rather than on the press release: if the EU suites are genuinely useful to your company, moving is fine and the platform underneath you is a serious one. If they are not, you are paying for a European compliance stack to file a California report, and this is the cheapest moment you will get to change that.

If you want to see what an invoice-first inventory looks like before you talk to anyone, the classifier at the top of this page runs on your own data, and our pricing is on the pricing page rather than behind a form.