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Stefan's Blog

Follow the blogs of our expert Stefan Schlamp, Head of Quantitative Analytics, about recent trends and developments in the market.

111 results
  1. Stefan's blog: Mo' Volatility, Mo' Option Volume

    Mar 9, 2026

    How does option volume compare to that of futures? One narrative is that when things get volatile (a lot of volume) then there is (relatively) ... More

  2. Stefan's blog: Are Busy Days Just Quiet Days With More Volume?

    Mar 2, 2026

    In a few weeks (from the time of writing), the new version of our HHI (Herfindahl-Hirschman index) dataset will be releases. It provides ... More

  3. Stefan's blog: Liquidity Picture vs. ADV

    Feb 23, 2026

    Suppose all trades in a stock only trade part of the liquidity available at the BBO. More size would have been available, but it was not taken. More

  4. Stefan's blog: Collusion or Just Pricing?

    Feb 16, 2026

    A recent study found "collusion" between ETF market makers on Euronext. The hypothesis and methodology are actually pretty cool. The authors ... More

  5. Stefan's blog: Market Impact is a Non-Issue for HFTs

    Feb 9, 2026

    Despite that large volumes that are traded by high-frequency traders and their market share, market impact in the classical sense is, at least for ... More

  6. Stefan's blog: Does Liquidity Attract Volume?

    Feb 5, 2026

    Where are orders sent given the choice between multiple lit venues? First priority should be the price. Given the same price, liquidity becomes a ... More

  7. Stefan's blog: Fantastic Beasts: The SMP^41

    Jan 26, 2026

    For the 6-year period 20200101-20251231, the title for "most SMP'd orders in a single event" (SMP: self-match prevention, i.e., order is deleted ... More

  8. Stefan's blog: One Billion, Two Billion, Test, Test

    Jan 19, 2026

    Warren Buffet gave a speech at my school once. Instead of the normal microphone tapping "1, 2, 3, test" he went "1 Million, 2 Million, test". From ... More

  9. Stefan's blog: Private-First Liquidity

    Jan 13, 2026

    One argument for private-first data dissemination is that it incentivizes liquidity provision through the information advantage that a passive ... More

  10. Stefan's blog: Real-Time HHI Value Added

    Jan 13, 2026

    EOBI release 11.0 in November 2022 introduced the dissemination of a market concentration metric in real-time for each level of the order book ... More

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