County banking markets / NY / 36103
SuffolkNew York
FIPS 36103. Branch offices reported to the FDIC Summary of Deposits, June 30 of each survey year, 1994–2025. One of 62 counties in New York’s 2025 survey.
Concentration, 1994–2025
Branch-count HHI squares each institution’s share of the county’s branch offices; deposit HHI squares its share of county deposits. The bands are the 2010 Horizontal Merger Guidelines classification, the dashed line the 1,800 level above which the Federal Reserve reviews a merger centrally. In 2025 this market is unconcentrated on branches (1,000) and unconcentrated on deposits (1,242).
Source: FDIC Summary of Deposits | DOJ & FTC, Horizontal Merger Guidelines (2010), section 5.3 | Federal Reserve, Competitive Effects of Mergers and Acquisitions FAQs Both indices computed from the SOD branch rows for this county, June 30 of each survey year. Neither is the Fed's screen HHI: no thrift weighting, no exclusion of specialty and internet banks, no central-booking adjustment. Methodology
Branches and institutions
408 branch offices and 41 institutions in 1994; 305 and 22 in 2025. Deposits booked in the county went from $19.12B to $62.81B, nominal.
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30 of each survey year, 1994-2025. Methodology
Who holds the deposits, 2025
Every institution with a branch in the county, ranked by deposits booked here. Both shares are shown because they are the two indices above: squaring and summing the deposit column gives the deposit HHI, the branch column the branch-count HHI.
| # | Institution | Deposits | Deposit share | Branches | Branch share |
|---|---|---|---|---|---|
| 1 | JPMorgan Chase Bank, National Association cert 628 | $16.80B | 26.74% | 64 | 20.98% |
| 2 | Dime Community Bank cert 6976 | $6.34B | 10.10% | 28 | 9.18% |
| 3 | Capital One, National Association cert 4297 | $6.23B | 9.92% | 15 | 4.92% |
| 4 | Bank of America, National Association cert 3510 | $5.93B | 9.44% | 29 | 9.51% |
| 5 | TD Bank, National Association cert 18409 | $5.91B | 9.41% | 27 | 8.85% |
| 6 | Citibank, National Association cert 7213 | $4.55B | 7.24% | 18 | 5.90% |
| 7 | Flagstar Bank, National Association cert 32541 | $3.53B | 5.63% | 16 | 5.25% |
| 8 | Manufacturers and Traders Trust Company cert 588 | $3.34B | 5.32% | 36 | 11.80% |
| 9 | BankUnited, National Association cert 58979 | $2.13B | 3.38% | 1 | 0.33% |
| 10 | Webster Bank, National Association cert 18221 | $1.95B | 3.11% | 14 | 4.59% |
| 11 | Apple Bank cert 16068 | $1.44B | 2.29% | 10 | 3.28% |
| 12 | ConnectOne Bank cert 57919 | $1.42B | 2.26% | 18 | 5.90% |
| 13 | Wells Fargo Bank, National Association cert 3511 | $767.5M | 1.22% | 3 | 0.98% |
| 14 | Citizens Bank, National Association cert 57957 | $692.2M | 1.10% | 8 | 2.62% |
| 15 | Flushing Bank cert 58564 | $652.6M | 1.04% | 5 | 1.64% |
| 16 | Valley National Bank cert 9396 | $517.5M | 0.82% | 4 | 1.31% |
| 17 | Ridgewood Savings Bank cert 16026 | $194.5M | 0.31% | 3 | 0.98% |
| 18 | City National Bank cert 17281 | $139.7M | 0.22% | 1 | 0.33% |
| 19 | Hanover Community Bank cert 58675 | $113.6M | 0.18% | 2 | 0.66% |
| 20 | First Central Savings Bank cert 34969 | $63.3M | 0.10% | 1 | 0.33% |
| 21 | Santander Bank, N.A. cert 29950 | $47.7M | 0.08% | 1 | 0.33% |
| 22 | American Community Bank cert 35033 | $40.5M | 0.06% | 1 | 0.33% |
Source: FDIC Summary of Deposits June 30, 2025. Branch rows grouped by FDIC certificate; names as reported to the survey. Deposit share is n/a where the county's total SOD deposits are zero. Methodology
Back to county banking markets, up to New York, or read the methodology for the two HHI constructions and what they cannot tell you.