Remember when everyone thought the financial sector was bulletproof? I was looking back at 2016 and honestly, it's wild how quickly things shifted. Banks got absolutely hammered that year and it actually sparked this interesting conversation about shorting strategies using ETFs.

The setup was pretty straightforward if you were paying attention. Interest rates weren't moving up like people expected, the yield curve started flattening, and suddenly bank profit margins looked shaky. Energy sector exposure made it worse - oil prices were in the dumps and banks were getting hit with loan provisions for struggling oil companies. It was the kind of environment where if you were bearish on financials, you actually had legitimate reasons beyond just market sentiment.

What fascinated me though was how accessible it became to short bank stocks. Instead of getting into complicated derivatives, you could just use short bank ETF products. The market had created this whole ecosystem of inverse ETFs specifically for this purpose, which meant retail investors could actually express a bearish view on the sector without needing a margin account or understanding options.

The options were honestly pretty diverse. You had your basic unleveraged inverse plays like SEF, which just moves opposite to the financial index daily. Then if you wanted more aggressive positioning, there were 2x and 3x leveraged versions - SKF was the 2x product, while FINZ and FAZ both offered 3x inverse exposure. FAZ was particularly interesting because it had real volume and assets backing it, unlike some of the other exotic short bank ETF products that were basically ghost towns liquidity-wise.

For people focused specifically on regional banks, there were dedicated short bank ETF options too. KRS and WDRW targeted that segment specifically. WDRW in particular had this wild 53% return that year if you were positioned correctly, though obviously that's leveraged decay working in your favor in a down market.

The real caveat though - and this is important - these short bank ETF products are daily rebalancing vehicles. They're not meant for buy-and-hold investors. If you're thinking multi-month positions, the math works against you due to how the leverage resets. These are tactical tools for traders who genuinely believe the trend is their friend in the near term.

Looking back, it was a solid case study in how market structure evolves. When the thesis gets bearish on a sector like financials, the infrastructure emerges to let people express that view efficiently. Whether you needed unleveraged exposure or wanted to go aggressive with 3x leverage on a short bank ETF, the options existed. That accessibility probably amplified the selling pressure too, which is worth thinking about.