~1 min read · 203 words ·updated 2026-04-29
Market data overview
Auto-refreshed daily via the standard photonics-research data pipeline (Yahoo Finance OHLC, FINRA short interest, EDGAR institutional holdings, post-HFIAA Form 4).
Coverage
| Stream | Source | Refresh |
|---|---|---|
| Daily OHLC | Yahoo Finance | Daily after NASDAQ close |
| Short interest | FINRA / NASDAQ disseminated | Bi-monthly settlement-date prints |
| Institutional 13F/13G | EDGAR | Quarterly (45 days post quarter-end) |
| Form 4 insider transactions | EDGAR (post-2026-03-18 only) | Daily |
| Options chain | Yahoo Finance derivatives feed | Daily |
| Off-exchange / dark-pool % | FINRA ATS | Weekly |
HFIAA note: Tower is a Foreign Private Issuer; pre-HFIAA (2026-03-18) insider trades did NOT generate Form 4 filings. Post-HFIAA they do. Any Form 4 history shown predates 2026-03-18 only if explicitly back-filed (uncommon).
Sub-pages
- Stock price history — 10y daily series with annotated events
- Short interest history — bi-monthly FINRA series
- Institutional holders — 13F/13G top holders, quarterly delta
- Insider transactions log — post-HFIAA Form 4 only
- Options chain — IV term structure, OI heatmap
- Off-exchange / dark-pool — FINRA ATS share %
- Credit / debt market positioning — bond/loan posture if applicable