GMAB Market Structure
Genmab A/S (GMAB) operates in the Healthcare sector, specifically the Biotechnology industry, with a market capitalization near $22.45B, listed on NASDAQ, employing roughly 3,119 people, carrying a beta of 0.65 to the broader market. Genmab A/S, a biopharmaceutical company founded in 1999 and headquartered in Copenhagen, Denmark, specializes in the discovery and development of innovative antibody therapies primarily for treating cancer and various other serious illnesses. Led by Jan van de Winkel, public since 2009-06-01.
Market structure data reveals where a stock trades across exchanges, dark pools, and alternative trading systems. Understanding off-exchange activity helps identify institutional trading patterns and liquidity dynamics.
- Latest Week Ending
- 2026-09-07
- Weekly OTC Shares
- 608.2K
- Weekly OTC Trades
- 6.1K
- 12-Week Total Shares
- 17.0M
- Avg Trade Size (12-Week)
- 199 shares
How Single-Name Off-Exchange Volume Affects Options
For single-name equities, persistent off-exchange volume concentrations can flag institutional positioning - large blocks arranged through ATS venues to avoid lit-market impact, or correlation-arbitrage flow from sector rotation. The flow doesn't directly move the lit-market price (it prints at the ATS) but it changes the inventory position of the institutional counterparty, which then drives subsequent lit-market flow. Compare the off-exchange volume series above with GMAB's gamma exposure and options volume history to see whether unusual dark-pool activity coincides with rebalancing in the options book.
Showing 12 weeks of off-exchange trading data for Genmab A/S.
Learn how market structure is reported and how to read the data →
Frequently asked GMAB market structure questions
- What is the current GMAB off-exchange volume?
- For the week ending Sep 7, 2026, Genmab A/S (GMAB) recorded 608.2K shares across 6.1K trades (average trade size 100 shares). The 12-week cumulative total is 17.0M shares.
- What does GMAB off-exchange volume mean for traders?
- Off-exchange volume on a single-name equity reflects institutional block trades arranged through alternative trading systems (ATS) for liquidity rather than information reasons. Persistent ATS volume on a name can signal large institutional repositioning; the lit-market price impact lags the off-exchange print by hours to days as the institutional counterparty hedges or unwinds.
- How is GMAB market-structure data sourced?
- Weekly off-exchange volume figures come from FINRA's OTC Transparency reporting, which captures trades executed through FINRA-member off-exchange venues including ATSs and member firm internalization desks. FINRA publishes the data with a two-week lag (current-week-minus-two-weeks) for ATS-specific volume and weekly aggregate volume; the totals here aggregate all member firm reporting. Trades cleared via the listed-exchange auction are NOT included; the figure reflects only the off-exchange portion of total volume.