Here’s a number that should make every foundation board a little restless: $750 million. That’s how much money the MacArthur Foundation now plans to keep in its impact investing pool, after it announced a 50% jump on October 8. So MacArthur impact investing just went from big to very big. But honestly, the dollar figure isn’t the most interesting part. The approach behind it is.
Quick refresher if you’re new here. Impact investing means putting money into funds or companies that aim for a social or environmental result while also expecting money back. We’ve covered what impact investing really means before, so let’s stick to the news.
So what did MacArthur actually announce?
The short version: MacArthur is growing its pool for impact investments by half, to $750 million. The foundation says the increase takes effect in 2027. It’ll put the money to work over the coming years and then recycle it. In other words, when a borrower pays back a loan, that cash goes straight into the next deal.
The board also extended a pledge it calls “Set it at Six.” Foundations usually pay out about 5% of their assets a year. MacArthur says it’ll pay out at least 6% through 2028, counting grants and other charitable spending.
For scale, ImpactAlpha puts MacArthur at about $10 billion. Since 1983, the foundation has committed nearly $1 billion to impact investments across roughly 300 organizations. So this pool isn’t a side project. It’s a serious chunk of what the foundation does.
What does “impact first” even mean?
Here’s the part we find more telling. According to ImpactAlpha’s report, MacArthur will take an “impact first” approach. That means the foundation puts the real-world result ahead of the best possible market return. It still wants its money back, though. It just won’t drop a good project because the return looks thin.
The rule covers two kinds of deals. First, there are program-related investments, or PRIs, which come out of the foundation’s program side. Then there are mission-related investments, or MRIs. Both can take the form of loans, equity or guarantees.
Why does this matter? Plenty of investors say they care about impact. Far fewer will say out loud that impact comes first. MacArthur is saying exactly that, and it’s backing the words with $750 million.
Also, impact first doesn’t have to mean bad returns. ImpactAlpha notes that an early MacArthur investment in a Bay Area job-creation fund took an early stake in Tesla. Not bad for a foundation.
Where the MacArthur impact investing money goes
So who actually gets this money? The foundation’s strategy page lists nonprofits, for-profit companies, special funds and even public agencies. It also says MacArthur backs deals that regular investors see as too risky, not profitable enough or too new.
Debra Schwartz runs the impact investment team. She goes by @ImpactBanker online, which we love. ImpactAlpha reports she recently moved $150 million of recycled capital into a mix of funds. For example:
- Prime Impact Fund, which backs early-stage climate innovation
- Social Finance’s UP Fund, which focuses on workforce re-skilling
- Terra Silva, which works on carbon capture in tropical forests
- Impact America Fund, plus a Rockefeller Foundation portfolio
There’s a hometown angle too. MacArthur’s Arts and Culture Loan Fund gives Chicago arts groups lines of credit on top of their grant funding. It’s small next to $750 million, yet it shows how the tool works on the ground.
Why this one’s a big deal
Foundations watch each other closely. So when a $10 billion name raises its impact budget by half, other boards notice.
MacArthur also helped start the Catalytic Capital Consortium, a group of more than a dozen foundations and family offices. “Catalytic capital” sounds fancy, but the idea’s simple. These investors take more risk, accept lower returns or wait longer for repayment, so that bigger investors feel safe enough to join. If you want the full mechanics, our guide to blended finance walks through it.
Schwartz has been blunt about what the field still lacks. She told ImpactAlpha: “We need a pure-play, purpose-built, impact-prioritizing and market-building institution.” In plain words, she wants more groups built for impact from day one.
The timing was smart as well. The news landed just before SOCAP, a big impact investing conference that moved to Chicago this year with MacArthur’s support. Nothing gets a conference hallway buzzing like a fresh $750 million.
So what does MacArthur impact investing mean for you?
If you’re in Armenia or another emerging market, a Chicago foundation’s budget can feel far away. Fair enough. But MacArthur invests in the US and globally, and big funders tend to set the tone for everyone else. Here’s what we’d take from it.
First, impact first is moving from niche to normal. If you run a social enterprise, you may find more investors open to slower or smaller returns in exchange for real results. You’ll still need solid numbers, though, because “impact first” isn’t “impact only.”
Next, recycling matters. MacArthur’s money keeps coming back and going out again. That’s a model local funds and diaspora investors could copy, and it’s one reason we keep writing about social impact investing on this blog.
Finally, the open question. Will other big foundations follow MacArthur impact investing with their own jump, or will this stay a one-off? We’d bet on followers. But we’ll be watching, and we’d love to hear which local projects you think deserve this kind of patient money.