Methodology — COHR-specific
This page captures the Coherent-Corp.-specific particularities that affect how the standard photonics-research data pipeline works on this ticker.
Filing regime — US-domestic, Form 10-K / 10-Q / 8-K / Form 4
Coherent Corp. is a US-domestic filer incorporated in Pennsylvania. Section 12 of the Exchange Act applies; standard Form 10-K + 10-Q + 8-K + Form 4 cadence with no HFIAA gap. Compare:
| Tenant | Regime | Form 4 |
|---|---|---|
| COHR (Coherent) | US-domestic | Real-time (no HFIAA gap) ✓ |
| LITE (Lumentum) | US-domestic | Real-time ✓ |
| LWLG | US-domestic | Real-time (with 2024-12-11 Lebby/LeMaitre era split) ✓ |
| MRVL | US-domestic | Real-time ✓ |
| POET | FPI (20-F + 6-K) | Post-2026-03-18 only (HFIAA closed FPI carve-out) |
| GFS | FPI (20-F + 6-K) | Post-2026-03-18 only |
| TSEM | FPI (20-F + 6-K) | Post-2026-03-18 only |
Fiscal year — Saturday closest to June 30 (52/53-week)
| FY | Period |
|---|---|
| FY2024 | Sun Jul 2 2023 – Sat Jun 29 2024 |
| FY2025 | Sun Jun 30 2024 – Sat Jun 28 2025 (52-week) |
| FY2026 | Sun Jun 29 2025 – Sat Jun 27 2026 |
Fiscal-quarter labels:
- Q1 FY = Jul–Sep
- Q2 FY = Oct–Dec
- Q3 FY = Jan–Mar
- Q4 FY = Apr–late Jun (rolled into 10-K, no separate 10-Q)
CIK 0000820318 — same CIK across the rename
Coherent Corp. (Sept 8, 2022 onward) and the predecessor II-VI Incorporated (1995-10-04 → Sept 8, 2022) share CIK 0000820318. Filings under the legacy “II-VI INCORPORATED” registrant name are all addressable via the same submissions-feed endpoint.
10b5-1 plan flags
10b5-1 trading plans are common among COHR named executive officers. The Form 4 footer is parsed by edgar_form4_parse.py for the [1] Sales pursuant to a 10b5-1 plan and similar disclosures, surfaced in the JSON dataset’s plan10b5_1 field.
Era split — none
scripts.env for COHR sets FORM4_ERA_SPLIT_DATE= (empty) — no thesis-load-bearing era boundary. The June 3, 2024 Mattera→Anderson CEO transition is the closest candidate but the broader 10b5-1-driven sales pattern doesn’t change shape across that boundary.
For comparison: LWLG splits on 2024-12-11 (Lebby/LeMaitre transition); GFS, MRVL, POET, TSEM, LITE all have no era split.
Capital-structure data — manual hand-fill on 429s
Yahoo’s quoteSummary endpoint occasionally returns HTTP 429 (rate-limited), in which case bootstrap_stock_data.py writes only snapshot fields and leaves marketCap, sharesOutstanding, float, beta, peRatio, insiderPct, institutionalPct as null. When this happens, hand-fill from the most recent 10-Q cover page (legal share-count statement) and the most recent earnings deck.
Pipeline scripts (per the standard photonics-research toolset)
PYTHON=$(/usr/bin/which python3)
cd "/Users/wardelst/Documents/Cursor Projects/LWLG Research/site/scripts"
$PYTHON update_price_history.py --ticker COHR
$PYTHON update_finra.py --ticker COHR
$PYTHON edgar_monitor.py --cik 0000820318 --ua "COHR Research ward@elst.be"
$PYTHON edgar_form4_history.py --cik 0000820318 --ua "COHR Research ward@elst.be" --ticker COHR
$PYTHON daily_diff.py --company cohr --ticker COHR
These run nightly via the 15 01 * * 2-6 crontab line (Tue–Sat at 01:15 CEST, the slot after LITE).