Picture a typical government bank from a decade ago. Long queues, dusty files, and an unmistakable aura of lethargy. Now, picture a private bank—sleek, fast, and ruthless about operational efficiency. For the longest time, the Indian stock market treated this contrast as a permanent law. Private lenders were wealth-compounding machines, while public sector banks (PSBs) were simply trying to survive the burden of bad loans.

Well, the market is currently eating its words.

Over the past month, while the broader Nifty 50 has been mostly flat, the Nifty PSU Bank index quietly surged by 4%. On a single trading day, heavyweights like Bank of Maharashtra, State Bank of India, and Bank of Baroda drove the index up by nearly 2%.

What exactly is cooking in the public banking space?

To understand this, we need to look at a working paper from the Economic Advisory Council to the Prime Minister (EAC-PM) titled “Reforms, Efficiency and Productivity of Indian Banking Sector: A DEA Approach.”

The paper dropped a bombshell: Public Sector Banks are now actually more efficient than private and foreign banks in India.

The researchers analyzed 47 banks covering over 95% of the banking system’s assets from FY15 to FY26. Using Data Envelopment Analysis (DEA), a metric measuring how efficiently a bank converts internal resources (like operating expenses, fixed assets, and employee costs) into tangible outputs (like deposits, credit, and profits), the EAC-PM revealed a stark structural shift.

Back in FY20, PSB technical efficiency stood at 72.46%. By FY26, it skyrocketed to 93.12%. In contrast, private banks trail behind at roughly 86.02%.

This shift is the culmination of a grueling decade of bad-loan recognition, aggressive recapitalization, mergers, and digital upgrades. Gross Non-Performing Assets (NPAs) plummeted from a terrifying 11.5% in March 2018 to 1.68% by June 2026. Meanwhile, the capital adequacy buffer (CRAR) stands at a solid 17.78%.

Beyond balance sheet repair, the recent market momentum is being fueled by three specific operational tailwinds.

1. The Great Deposit War & Margin Arithmetic

Right now, the Indian banking sector faces a structural deposit challenge. The EAC-PM paper highlights that credit growth is heavily outpacing deposit growth. By July 2026, credit was growing at 19.3%, while deposits lagged at 15.4%.

This gap forces lenders to compete aggressively for funds. Private banks are leaning on expensive certificates of deposit and bulk funding, which compresses their Net Interest Margins (NIM). The paper explicitly warns that the key to sustained margins is mobilizing stable deposits while avoiding excessive unsecured retail lending.

PSU banks are relatively insulated from this squeeze. They hold immense, sticky CASA (Current Account and Savings Account) deposit bases. Deep public trust gives government banks access to stable pools of low-cost funds, protecting their margin profile even as industry-wide funding costs rise.

2. The Oil and Treasury Dynamics

Crude oil prices have cooled below $85 a barrel. For an oil-importing economy like India, lower crude eases inflation concerns, reduces expectations of aggressive monetary tightening, and helps soften bond yields.

By regulatory mandate, Indian banks park a portion of their deposits in government securities under the Statutory Liquidity Ratio (SLR). Because PSU banks command vast deposit bases, they hold substantial SLR portfolios. When bond yields soften, bond prices rise, creating outsized “treasury gains” for state-owned lenders holding large sovereign portfolios.

3. The Next Tech Frontier and Automation

The EAC-PM paper notes that the next wave of banking productivity will be driven by Artificial Intelligence and Machine Learning. PSBs are making direct infrastructure investments in automated credit underwriting, digital onboarding, and algorithmic fraud detection.

Following strong Q1 FY27 earnings, sustained double-digit credit growth, and healthy asset quality metrics, public lenders are demonstrating that their operational transformation is structural rather than temporary.

Historically, rallies in state-owned bank stocks have seen rapid cyclical swings, leading many analysts to view private banks as the primary long-term core holdings. However, the current momentum is anchored in measurable operational data. With favorable funding dynamics, expanding operational efficiency scores, and lower risk profiles, India’s public sector banks are proving their capability to perform in a complex credit environment.