What your long/short book really depends on
Your longs and shorts seen through the supply graph: hidden concentrations on one foundry or customer, longs and shorts that hang on the same company, supplier geography, and a shock simulator.
Request access| Hidden driver | Longs ▬ / shorts ▬ | Net |
|---|---|---|
| TSMC | +37% | |
| Samsung Electronics | +34% | |
| SK hynix | +27% | |
| Alphabet | +28% | |
| Microsoft | +19% | |
| Cisco | +26% | |
| Dell | +23% | |
| Apple | +28% |
Concentration you can't see in a sector report
Five semiconductor longs can look diversified by ticker and still all lean on one foundry. A consumer long and a consumer short can sell to the same retailer. Book X-ray maps every position to its suppliers and customers (including suppliers' suppliers) and adds up the dependencies across the book, long, short and net.
Longs and shorts on the same driver
When a long and a short hang on the same company, your hedge may be cancelling the exposure you wanted, or doubling one you didn't. Book X-ray lists every shared driver with the positions on each side.
Supply-base geography
Each position's direct suppliers by country, weighted by position size: the Taiwan, China or Mexico exposure behind your book, separately for longs and shorts.
Shock anything
Pick any company in the graph and move it ±30%. rejo estimates the move of every position from the calibrated pass-through of its link, shows the P&L by position, and draws the path that carries it. Where a link type has no measurable pass-through, it says so rather than guessing.
Private by design
Positions are entered by paste or CSV and stored only for your account. They are never shared with other users or used to train anything.