🔄 Pagaya and Upstart get Castlelake cash while IBKR counts commissions

You know that one friend who somehow dates everyone in the same friend group and still gets invited to brunch? That’s Castlelake this week—playing matchmaker and money source for both Pagaya (PGY) and Upstart (UPST). The credit investor just dropped billions in fresh funding commitments to keep their AI lending models fed. Meanwhile, Interactive Brokers (IBKR) showed up to earnings season in a perfectly ironed suit and reminded everyone that you don’t need to be flashy to get paid.

In short: two fintechs needed a lifeline, and one just kept quietly cashing checks.

Pagaya, the AI lending network based in Tel Aviv, locked in a $500 million asset-backed credit facility with Castlelake to fund auto loans. The move pushes Pagaya deeper into consumer credit territory—and diversifies its lending flows beyond personal and point-of-sale loans.

Founded in 2016, Pagaya runs an invisible-but-essential network that lets banks and fintechs plug into institutional funding through AI underwriting. It doesn’t make loans directly; it powers others’ approvals. Think of it as the connective tissue between lenders and the capital markets.

The new Castlelake deal lets Pagaya buy and securitize auto loans originated through its partner network. With Americans borrowing like it’s a competitive sport (average new car loan = $40K, average APR = pain), the timing isn’t bad. Pagaya’s system thrives on data, and auto loans provide a rich, recurring stream of it.

Recent numbers look sturdy: network volume rose 36% YoY in Q2 2025, hitting $2.5B, while revenue climbed 33%. That kind of growth signals quiet endurance in a market where “AI lender” used to be shorthand for “SPAC disaster.” Castlelake’s $22B in assets and long history in structured credit give this deal extra credibility.

For Pagaya, this isn’t just about liquidity—it’s about legitimacy. Surviving the post-SPAC hangover took discipline, but now the company’s turning into a serious data infrastructure player for lenders.

Takeaway: Pagaya’s not chasing drivers—it’s chasing credibility, and $500 million buys a lot of that.

If Pagaya’s news turned heads, Upstart’s announcement broke necks. The San Mateo–based AI credit pioneer revealed a $1.5 billion forward flow agreement—also with Castlelake. Same dance partner, three times the money.

For context: Upstart’s entire business model hinges on finding investors willing to buy the loans its algorithms approve. In 2022, when interest rates soared and investors vanished, that dependency nearly killed the company. Loan originations plummeted, its stock cratered more than 90%, and Wall Street moved on.

Now, with Castlelake back on board (they’ve worked together since 2023), Upstart gets funding certainty again. The new agreement covers a multi-year period and ensures steady liquidity for consumer loans. That means Upstart can keep underwriting without praying to the Fed at every FOMC meeting.

The timing’s convenient. Upstart’s Q2 2025 results showed $1.2B in loans originated, up 22% from the prior quarter. The company’s shifting beyond personal loans too—testing auto refi and small-dollar credit with banking partners. CEO Dave Girouard insists Upstart’s AI can “rebuild credit from first principles.” With $1.5B in new funding, he now gets to prove it.

The Castlelake relationship also signals that institutional investors haven’t lost faith in AI underwriting—just in reckless scaling. Upstart, humbled by the last cycle, seems to be prioritizing capital discipline over hype. And maybe that’s what this market actually rewards.

Takeaway: Upstart’s AI doesn’t just predict credit—it predicts which investors still believe in second chances.

While everyone else begs for liquidity, Interactive Brokers keeps making it. The veteran brokerage posted Q3 2025 net revenues of $1.25B, up 16% YoY, with net income jumping 18%. Client equity balances hit a record $470B, proving that even in a choppy market, traders never stop trading.

The secret isn’t flashy product design—it’s scale, precision, and cheap execution. IBKR’s global reach and pro-grade tools attract serious traders and hedge funds, not meme-chasers. Every time competitors like Robinhood try to reinvent themselves, IBKR just sits back, tweaks its rates, and lets compounding do the rest.

The big win this quarter: net interest income surged 29%, fueled by elevated rates and idle cash in client accounts. That’s the beauty of IBKR’s model—when the Fed stays higher for longer, Peterffy’s empire gets paid more for doing the same thing.

Thomas Peterffy, the firm’s 80-year-old founder-CEO, summed it up neatly: “We execute and grow.” Translation: no NFT wallets, no loyalty programs, no influencer deals. Just revenue.

Takeaway: While fintechs chase relevance, IBKR keeps printing money the old-fashioned way—by not blowing it.

Stack Recap: Pagaya’s auto loan AI gets a $500M gas tank, Upstart reloads with $1.5B in investor faith, and IBKR cashes in on everyone’s trading addiction.

Disclaimer: This content is for information and entertainment only and is not investment advice. I may or may not hold positions in some of the companies mentioned. Assume I at least own a fintech hoodie and a bunch of debit cards.