Segmentation & portfolio
Donor Concentration Risk: If One Major Donor Walks, What Breaks?
Most of your budget may depend on a handful of people. The fix starts with measuring exactly how few.
By Donor Insights · Published August 8, 2026 · Updated August 27, 2026 · 8 min read
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Key takeaways
- Donor concentration risk measures how much of your revenue depends on your largest donors, and what breaks if one or two of them leave.
- Across the sector, donors giving $5,000 or more supply 78.6% of all dollars while making up 3.4% of donors (Fundraising Effectiveness Project, 2025).
- Measure it directly: revenue from your top few donors divided by total revenue. If your top two donors are a third of the budget, one departure reshapes the year.
- The smallest donors are just under half of all donors but 1.4% of dollars, and that base is thinning. Small donors giving $1 to $100 fell 7.9% in 2025.
- Resilience lives in the middle. Donors who give repeatedly are retained far better, so a healthier mid-tier steadies revenue against any single loss.
Donor concentration risk is the share of your revenue that depends on a small number of donors, and how much of your budget breaks if one or two of them stop giving. Across the sector the picture is stark: donors giving $5,000 or more account for 78.6% of all dollars while making up just 3.4% of donors, according to the Fundraising Effectiveness Project. If your own file looks anything like that, the departure of a few top givers is not a rounding error. It is most of your year.
What is donor concentration risk?
Donor concentration risk is the fundraising version of a lopsided investment portfolio. When a few holdings carry the whole return, one loss undoes the year. Read your donor file the way a fund reads a portfolio and the same question applies: how much of the total sits in how few names, and what happens to the rest of the plan if those names leave.
The sector-wide numbers show why the question matters. Giving splits into a narrow top that carries the dollars and a wide base that carries the headcount. Both ends move, and they do not move together.
| Donor tier | Share of donors | Share of dollars |
|---|---|---|
| Gave $5,000 or more | 3.4% | 78.6% |
| Gave $1 to $100 | 49.3% | 1.4% |
That gap is concentration risk in one table. A small top tier funds the mission while a large base of small donors barely registers in dollars. Neither figure is a problem on its own. The risk is what depends on the top row, and how few people that row represents inside your own file.
How do you measure donor concentration?
Measure concentration directly: take the revenue from your top few donors and divide it by your total revenue. Run it for your top 1, top 2, and top 10 givers, and you have a plain reading of how much of the budget rides on how few people.
You can build it from one export of this year's gifts. Sort donors by total giving, take a running sum from the top, and read off what the first one, two, and ten donors add up to as a percent of the whole.
- 1.Export every gift for the year and total it by donor, so each donor is one row.
- 2.Sort donors from largest total to smallest.
- 3.Take a running sum down the list, and divide each running total by overall revenue.
- 4.Read the top-1, top-2, and top-10 percentages. Those three numbers are your concentration profile.
Say a fictional organization, Cedar Ridge Fund, raised $1,000,000 last year from 1,200 donors. Sorting from the top gives the profile below. The numbers are illustrative.
| Donor group | Revenue | Share of total |
|---|---|---|
| Top donor | $200,000 | 20% |
| Top 2 donors | $320,000 | 32% |
| Top 10 donors | $540,000 | 54% |
| The other 1,190 donors | $460,000 | 46% |
Read the middle row as a loss, not an average: if Cedar Ridge's top two donors both lapse, the budget loses $320,000, nearly a third of the year, before anyone touches program plans. That single sentence is the reason to measure concentration before you need to.
One caution on the arithmetic: the average gift is not the concentration figure. Blackbaud Institute's 2025 data shows gifts of $1,000 or more grew 4.7% while gifts under $1,000 fell 1.1%, and large organizations grew 11.7% while small ones shrank 6.4%, so any average is being pulled upward by the largest gifts. Concentration is about the running sum from the top, not the mean, which is why the top-N percentages read the risk more honestly than any average can.
How concentrated is too concentrated?
There is no universal safe threshold, and any single benchmark number would be dishonest. What is fragile for a small community fund is normal for an organization built around a founding gift. The useful comparison is your own file over time, read against public sector data such as the Fundraising Effectiveness Project, not a scoreboard of other organizations.
Two readings tell you whether concentration is drifting the wrong way. First, is the top-N share rising year over year? Second, is the base underneath it shrinking? When the base thins, the same top gifts become a larger share of a smaller total, and concentration climbs even if no major donor changes a thing.
That base is thinning across the sector. The number of donors fell 3.6% in 2025, the fifth consecutive year of decline. Total dollars still grew 5.0%, because larger gifts carried the total, which is exactly how concentration rises quietly: the top holds while the middle and bottom drop away. Tracking the shape of your file over time is what cohort analysis is built to show.
How do you build mid-level resilience?
Resilience comes from a healthy middle of the donor pyramid, not from chasing more top gifts. Mid-level donors give enough to matter and give often enough to stay, so a stronger mid-tier is what steadies revenue against any single major loss. The starting point is knowing who your mid-tier is, which is what RFM segmentation sorts out.
The middle is fed from below, and the bottom is under pressure. Small donors giving $1 to $100 fell 7.9% in 2025 and slipped to 49.3% of all donors, from 50.8% the year before, according to the Fundraising Effectiveness Project. Fewer small donors entering means fewer candidates to grow into the mid-tier later, so the base and the middle rise or fall together.
The reason the middle holds is that giving frequency, not gift size, predicts who stays. Retention climbs steeply with how many times a donor has given, so the multi-gift donors that populate the middle are the ones least likely to disappear on you.
| Gifts in the prior year | Retained to the next year |
|---|---|
| One | 31.9% |
| Two | 51.9% |
| Three to six | 70.0% |
| Seven or more | 87.4% |
| Donor type | Retained to the next year |
|---|---|
| First-time donors | 18.9% |
| Repeat donors | 59.3% |
“Increasing customer retention rates by 5% increases profits by 25% to 95%.”
Donors are not customers, so the parallel is imperfect, but the direction holds: repeat, retained donors already contribute roughly 60% of total funding, so moving even a few first-time and second-gift donors into the middle is worth more to your stability than it looks. The practical work is to find the donors on that path and steward them well before they lapse.
Donor Insights reads your contacts and gifts the way a fund reads a portfolio and shows the concentration profile, the shape of the middle, and the survival curves underneath, all from your own giving records. The methodology behind those readings, and the platform that keeps them current, both start from your file rather than a benchmark someone else owns. It surfaces the segment to reach, and your team does the reaching in its own tools.
How do you diversify a concentrated revenue mix?
Diversification is not a reason to neglect major donors. It is building enough depth beneath them that a single loss is survivable. Three moves do most of the work:
- Name the risk. Put your top-1, top-2, and top-10 concentration on the leadership dashboard so a rising number is visible while there is still time to act on it.
- Grow the middle deliberately. Identify mid-level donors and the small donors most likely to become them, and steward that group as its own priority rather than folding it into the general file.
- Deepen giving frequency. A donor's second and third gifts are what move them from fragile to durable, so measure how many donors are advancing along that path each year.
None of this reduces what your major donors give. It changes what happens to the mission the day one of them stops.
Frequently asked questions
- What is donor concentration risk?
- It is the risk that too much of your revenue depends on too few donors. If your largest one or two donors make up a large share of the budget, their departure creates a shortfall that the rest of the file cannot quickly cover.
- How do I calculate donor concentration?
- Total each donor's giving for the year, sort from largest to smallest, and divide the revenue from your top few donors by total revenue. Reading the top-1, top-2, and top-10 shares gives you a plain profile of how concentrated your file is.
- What is a safe level of donor concentration?
- There is no universal threshold, and a single benchmark would mislead. Compare your own file over time and against public sector data, watching whether your top-donor share is rising and whether the donor base beneath it is shrinking.
- How do mid-level donors reduce concentration risk?
- Mid-level donors give enough to matter and, because they usually give repeatedly, they are retained far better than first-time donors. A deeper middle spreads revenue across more durable relationships, so no single major loss reshapes the year.
- Does diversifying mean spending less time on major donors?
- No. Major donors remain the largest source of dollars. Diversification means building enough depth in the mid-tier and the base that the organization can absorb the loss of any one major donor without a crisis.
Sources
Related articles
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Donor Cohort Analysis: Read Your File the Way a Fund Reads a Portfolio
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