Scope 3 Category 15 (Investments) — Definition and GHG Accounting Context
For most companies, Category 15 is a rounding error. For a bank, an asset manager, or a pension fund, it is essentially the entire carbon footprint — for financial institutions, portfolio emissions routinely exceed the institution’s own Scope 1 and 2 by more than two orders of magnitude. It is the one Scope 3 category whose materiality depends not on what a company makes, but on what it owns and lends.
Category 15 is where the GHG Protocol defines the boundary and PCAF supplies the arithmetic — the slot, and the method for filling it.
Scope 3 Category 15 (Investments) is the final category of the GHG Protocol Scope 3 Standard, covering emissions from a company’s equity, debt, project finance, and managed investments. For financial institutions it is the dominant category, reported as financed emissions using the PCAF Standard.
Definition and Place in Scope 3
The GHG Protocol Scope 3 Standard divides a company’s value-chain emissions into 15 categories — 8 upstream and 7 downstream. Category 15 is the final downstream category. It captures emissions associated with the reporting company’s investments, including the operation of those investments, that are not already counted elsewhere in the inventory. For a manufacturer this might be a minority stake in a supplier; for a bank it is the entire loan book and investment portfolio. The category sits downstream because the reporting company’s capital enables the investee’s activity, and the resulting emissions occur outside the reporting company’s own operations.
Category 15 at a Glance
The defining characteristics of Scope 3 Category 15, as set out in the GHG Protocol Scope 3 Standard and measured through the PCAF Standard.
| Property | Value | Notes |
|---|---|---|
| Category number | 15 | The fifteenth and final Scope 3 category |
| Position | Downstream | The last of the 7 downstream categories (8 upstream + 7 downstream = 15) |
| Covers | Investments | Equity, debt, project finance, and managed investments |
| Financial-sector name | Financed emissions | Same emissions, measured with PCAF attribution |
| GHG Protocol status | Optional | Reported where material; mandatory in practice for financial institutions |
| Measurement standard | PCAF (2024) | Global GHG Accounting Standard for the Financial Industry, v2 |
| Boundary standard | GHG Protocol | Scope 3 Standard defines the category; PCAF defines the method |
What Category 15 Covers
The GHG Protocol groups Category 15 into four investment types. Each describes a different financial relationship with the entity whose emissions are being counted.
| Investment type | What it covers |
|---|---|
| Equity investments | Shareholdings in companies — listed equity and unlisted/private equity stakes. |
| Debt investments | Corporate bonds and loans where proceeds are not earmarked for a specific project. |
| Project finance | Loans or equity tied to a defined project, where emissions can be traced to that asset. |
| Managed investments and client services | Assets managed on behalf of clients, and capital-markets services such as underwriting. |
These four types map onto the operational asset classes that PCAF defines for measurement, which is where the abstract GHG Protocol grouping becomes a calculable inventory.
PCAF Asset Classes and Denominators
PCAF resolves Category 15 into asset classes, each with its own attribution denominator — the issuer or asset value the reporting company’s stake is expressed as a share of. The denominator is what makes the attribution factor specific to each asset class.
| PCAF asset class | Attribution denominator | Calculator |
|---|---|---|
| Listed equity & corporate bonds | EVIC | Listed equity & bonds → |
| Business loans & unlisted equity | Total equity + debt (EVIC where listed) | Business loans → |
| Project finance | Total project equity + debt | Project finance → |
| Commercial real estate | Property value at origination | Commercial real estate → |
| Mortgages | Property value at origination | Mortgages → |
| Motor vehicle loans | Vehicle value at origination | Motor vehicle loans → |
| Sovereign debt | PPP-adjusted GDP | Sovereign debt → |
Two further PCAF classes sit alongside the on-balance-sheet seven: facilitated emissions from capital-markets activity, and insurance-associated emissions from underwriting. Each carries its own attribution rule and is reported separately from the balance-sheet total, not blended into it. The reliability of every figure is graded on a PCAF data quality score from 1 (reported, verified) to 5 (estimated from economic activity).
GHG Protocol vs PCAF — the “What” and the “How”
The relationship is worth getting straight: the GHG Protocol defines what Category 15 is; PCAF defines how to measure it. The Scope 3 Standard sets the boundary and says investments belong in Category 15. The PCAF Standard supplies the attribution factor, the per-asset-class denominators, and the data quality score that make the category calculable and comparable across institutions.
“Category 15” and “financed emissions” describe the same emissions from two viewpoints. Category 15 is the GHG Protocol’s slot in a company’s inventory; financed emissions is the financial sector’s name for filling that slot using PCAF attribution.
The Attribution Formula
Every PCAF asset class follows the same two-step structure: compute an attribution factor — the reporting company’s share of the investee — then apply it to the investee’s emissions.
Attribution factor = outstanding amount ÷ investee value (e.g. EVIC)
Financed emissions = attribution factor × investee emissions
Unit: tCO₂e
The denominator changes by asset class — EVIC for listed equity, property value for mortgages, PPP-adjusted GDP for sovereign debt — but the shape of the calculation does not. This is why a portfolio-level Category 15 figure is the sum of many per-holding attributions, each potentially at a different data quality score.
Worked Example — A Listed-Equity Holding
The illustrative holding below shows the full attribution chain for a single listed-equity position. The inputs are author-chosen demonstration figures, not sourced issuer data.
| Step | Input / calculation | Value |
|---|---|---|
| Investment held | Equity position in the investee | $10M |
| Investee EVIC | Enterprise value including cash | $500M |
| Investee emissions | Scope 1 + 2 of the investee | 40,000 tCO₂e |
| Attribution factor | 10 ÷ 500 | 0.02 |
| Financed emissions | 0.02 × 40,000 | 800 tCO₂e |
A $10M stake in a $500M-EVIC company represents a 2% attribution factor; applied to the investee’s 40,000 tCO₂e, the reporting company’s Category 15 financed emissions for this holding are 800 tCO₂e. The portfolio total is the sum of every holding calculated this way. Figures are illustrative inputs chosen to demonstrate the arithmetic.
Report Category 15 as an absolute total and an intensity. The absolute financed-emissions figure shows scale; Weighted Average Carbon Intensity (WACI) shows exposure and is scale-free. A portfolio can grow its absolute Category 15 total while its WACI falls — the two together tell the story neither tells alone.
When Is It Material, and Who Must Report It?
Category 15 is formally optional under the GHG Protocol and reported where material. For most non-financial companies it is genuinely immaterial. But for any institution whose business is lending or investing, it dwarfs every other scope and category combined, and “optional” gives way to specific disclosure obligations.
Under IFRS S2, financial institutions must disclose Category 15 financed emissions, including the methodology and asset-class coverage. Under CSRD / ESRS E1, it falls within the Scope 3 datapoints required where material — and for a bank or asset manager, materiality is not in question. The practical effect is that the GHG Protocol’s “optional” framing has been overtaken by mandatory regimes for the institutions to which the category actually applies.
Omitting Category 15 because it is “optional” is only defensible after a materiality assessment shows the investments are immaterial. For a financial institution that conclusion is untenable, and skipping the assessment is a completeness finding at assurance — not a conservative simplification.
Five Common Mistakes
Frequently Asked Questions
It is the investments category of the GHG Protocol Scope 3 Standard — emissions from a company’s equity, debt, project finance, and managed investments not already in Scope 1 or 2. For financial institutions it is where financed emissions are reported.
Through PCAF attribution. For each holding, divide the outstanding investment by the investee’s value (e.g. EVIC) to get an attribution factor, then multiply by the investee’s emissions. The portfolio total is the sum across all holdings. For example, a $10M stake in a $500M-EVIC company with 40,000 tCO₂e gives 0.02 × 40,000 = 800 tCO₂e.
They are the same emissions seen two ways. Category 15 is the GHG Protocol’s inventory slot for investments; financed emissions is the financial sector’s name for measuring that slot with the PCAF Standard‘s attribution method.
PCAF defines seven on-balance-sheet asset classes — listed equity and corporate bonds, business loans and unlisted equity, project finance, commercial real estate, mortgages, motor vehicle loans, and sovereign debt — each with its own attribution denominator. Two further classes, facilitated and insurance-associated emissions, are reported separately.
Under the GHG Protocol it is optional and reported where material — immaterial for most non-financial companies, decisive for banks and investors. IFRS S2 requires financial institutions to disclose it, and CSRD / ESRS E1 captures it within the Scope 3 datapoints where material.
Category 15 financed emissions are the absolute total; WACI is a scale-free intensity companion. The absolute figure shows how much emission the capital finances; WACI shows how carbon-intensive the holdings are. Frameworks increasingly expect both, because a portfolio can lower its WACI while its absolute Category 15 total rises.