Silicon Valley Bank Routing Number: The Collapse, the Rescue, and What Happened to Your Account

Forty-eight hours that rewrote American banking

On March 8, 2023, Silicon Valley Bank announced it had sold $21 billion in securities at a $1.8 billion loss and needed to raise $2.25 billion in fresh capital. By Friday morning, March 10, California regulators had closed the bank and placed it into FDIC receivership. In between, depositors attempted to withdraw $42 billion in a single day — roughly a quarter of SVB's total deposits. It was the fastest bank failure in modern history and the second largest by assets, behind only Washington Mutual in 2008.

SVB didn't fail because of fraudulent loans or reckless speculation. It failed because of a duration mismatch: heavy investment in long-dated Treasuries and mortgage-backed securities during the low-rate era of 2020-2021, followed by the Fed's aggressive rate hikes in 2022-2023, which crushed the market value of those bonds. When SVB tried to raise capital to plug the hole, the market panicked. Social media did the rest — depositors coordinated withdrawals through group chats, Twitter, and Slack, draining billions in hours rather than the days historical bank runs typically took.

What happened to SVB's routing number and accounts

SVB's routing number — 121140399 — survived the collapse. When the FDIC seized the bank, it created Silicon Valley Bridge Bank, N.A. to maintain operations. All deposits, insured and uninsured, transferred to the bridge bank. Customers could still access accounts, use existing routing and account numbers, and process transactions without interruption.

On March 27, 2023, First Citizens BancShares — a family-controlled bank holding company based in Raleigh, North Carolina — acquired the deposits, loans, and branches of the bridge bank. The deal closed the same day. Former SVB accounts became accounts at Silicon Valley Bank, a division of First Citizens Bank. Routing number 121140399 remained in effect. If you were an SVB customer before the failure, your routing number, account number, and online banking credentials carried over without any action required.

How First Citizens absorbed a bank twice its size

First Citizens, with roughly $100 billion in assets at the time, acquired a bank that had held over $200 billion in assets at its peak. The FDIC facilitated the deal through a loss-share agreement on SVB's commercial loan portfolio, which reduced First Citizens' risk enough to make the economics work. The acquisition took First Citizens from a mid-sized Southeast regional bank to a top-20 US institution overnight, inheriting SVB's relationships with venture capital firms, technology startups, and life sciences companies. First Citizens has maintained Silicon Valley Bank as a distinct division, preserving the relationship teams and industry expertise that made SVB the dominant startup bank for four decades.

What SVB changed

The concurrent failures of SVB, Signature Bank, and First Republic triggered the most significant reassessment of US banking regulation since 2008. Federal regulators proposed new rules requiring banks with $100 billion or more in assets to hold more capital, recognize unrealized losses on bond portfolios, and submit to more rigorous liquidity stress testing.

For depositors, SVB was a stark reminder that FDIC insurance limits matter. SVB's deposit base was heavily concentrated among venture-backed startups holding operating cash well above the $250,000 FDIC limit. When the bank failed, these companies briefly faced the possibility of losing access to funds needed to make payroll. The government's decision to guarantee all SVB deposits — not just the insured portion — prevented a broader crisis but set a precedent whose implications are still being debated.

Building for resilience in a post-SVB world

The SVB collapse taught every startup and growth-stage company the same lesson: concentration risk in banking is real, and your treasury strategy matters as much as your go-to-market strategy. Slash helps businesses manage that risk with FDIC insurance through its banking partners' sweep networks, real-time visibility into cash positions, and the operational tools — corporate cards, expense management, accounting integrations — that let finance teams run with confidence regardless of what's happening in the broader banking system.

The routing number on your account should be the least interesting thing about your bank. After March 2023, a lot of founders learned that the hard way.