Equibles short-interest nowcast
A 26,213-parameter numeric transformer that estimates the next official short-interest settlement value from the completed FINRA daily short-volume window. Each token is one trading day of numeric data, not text.
Read the full methodology, experiments, and limitations on Equibles.
Model
The model outputs P10, P50, and P90 estimates for the log change from the latest reported short interest, plus an uncalibrated cross-sectional ranking score. It predicts the next settlement endpoint—not an authoritative daily series—and does not equate short volume with open short positions.
ONNX inputs
| Input | Dtype | Shape |
|---|---|---|
daily_features | float32 | [batch, 32, 21] |
aggregate_features | float32 | [batch, 28] |
valid_days | bool | [batch, 32] |
Normalization is embedded in model.onnx; do not normalize the engineered
inputs again. Exact feature order is recorded in model-config.json and
manifest.json. The four outputs are
median_log_change, p10_log_change, p90_log_change, and rank_score, each
with shape [batch]. Convert a log-change output delta back to shares with:
estimated_short_interest = exp(log1p(previous_short_interest) + delta) - 1
Clamp operational endpoint estimates at zero after the inverse transform.
Training and results
Training used 660,246 consecutive settlement windows from January 2020 through July 15, 2026, combining official short-interest endpoints, FINRA daily volume, and filing-date-aware SEC shares outstanding. A two-layer, width-32, four-head transformer was selected across seeds 17, 29, and 43 with AdamW (batch 512, learning rate 0.0005, weight decay 0.0001). Development used data through 2023 for training, 2024 for selection, and 2025 through July 15, 2026 for the retrospective test. The released checkpoint was fit from scratch for seven epochs on all data with seed 17; the metrics below belong to the frozen three-seed evaluation, not that final checkpoint.
| Method | Pooled Spearman | Mean per-date Spearman |
|---|---|---|
| Ratio-change baseline | 0.2751 | 0.2755 |
| Raw-feature ridge | 0.3428 | 0.3452 |
| Numeric-transformer ensemble | 0.4143 | 0.4145 |
Limitations
Evaluation uses retrospective final-file FINRA data rather than strict point-in-time vintages, and the test period is not a pristine preregistered holdout. There are no authoritative daily short-interest labels. Training data and source are private; the published weights and metadata are Apache-2.0. This research model is provided without warranty and is not investment advice.
Stock-market data for AI agents
Connect your AI agent to stock-market data with the Equibles financial-data MCP server.