The RareEarth Index is a rules-based, free-float market-capitalization-weighted index of 13 publicly listed rare earth element producers, processors, magnet manufacturers and advanced-stage explorers, calculated daily in USD by Clay Indices since May 1, 2026.
Index level
As of 2026-10-16 · USD · closing prices · the latest level is provisional until the next daily run (data)
Key facts
| Administrator | Clay Indices (George Clay) |
|---|---|
| Inception | May 1, 2026; calculation date April 30, 2026 |
| Base value | 100 at the April 30, 2026 close |
| Constituents | 13. Fourteen at inception; Australian Strategic Materials (ASM.AX) deleted effective the August 19, 2026 close following its acquisition by Energy Fuels |
| Weighting | Free-float market capitalization with a 10% single-name cap and iterative pro-rata redistribution (methodology §5.2). Five constituents are cap-bound |
| Rebalance | Quarterly, third Friday of March, June, September and December, or the prior US trading day if a US market holiday (§8.1). Last: September 18, 2026. Next: March 19, 2027 |
| Reconstitution | Semiannual, June and December, same calendar slot (§8.2). Next: December 18, 2026 |
| Currency | USD; foreign listings converted at the daily close FX (§5.4) |
| Methodology | v2.1, effective October 10, 2026 (v2.0 at inception, May 1, 2026) |
| Latest level | 58.93 at the October 16, 2026 close (−41.07% since inception); provisional until the next daily run |
| Data and licence | Daily levels, history and rebalance periods as JSON and CSV, CC BY 4.0 with attribution to Clay Indices |
Level history
122 published closes from April 30, 2026 to October 16, 2026, base 100. The 20 most recent, newest first; the latest level is provisional until the next daily run, every earlier level is final (data page).
| Date | Level | 1-day | Status |
|---|---|---|---|
| 2026-10-16 | 58.93 | −0.24 (−0.41%) | provisional |
| 2026-10-15 | 59.18 | −0.53 (−0.89%) | final |
| 2026-10-14 | 59.71 | −2.20 (−3.56%) | final |
| 2026-10-13 | 61.91 | −1.62 (−2.55%) | final |
| 2026-10-12 | 63.53 | −1.66 (−2.55%) | final |
| 2026-10-09 | 65.20 | +0.22 (+0.34%) | final |
| 2026-10-08 | 64.98 | −2.22 (−3.30%) | final |
| 2026-10-07 | 67.20 | −0.96 (−1.40%) | final |
| 2026-10-06 | 68.15 | +0.82 (+1.21%) | final |
| 2026-10-05 | 67.34 | −0.02 (−0.02%) | final |
| 2026-10-02 | 67.35 | −0.52 (−0.77%) | final |
| 2026-10-01 | 67.87 | +0.89 (+1.32%) | final |
| 2026-09-30 | 66.99 | −1.11 (−1.63%) | final |
| 2026-09-29 | 68.09 | −0.84 (−1.21%) | final |
| 2026-09-28 | 68.93 | −2.14 (−3.01%) | final |
| 2026-09-25 | 71.07 | −1.81 (−2.49%) | final |
| 2026-09-24 | 72.88 | +0.11 (+0.16%) | final |
| 2026-09-23 | 72.77 | −2.44 (−3.24%) | final |
| 2026-09-22 | 75.20 | +0.99 (+1.34%) | final |
| 2026-09-21 | 74.21 | +2.24 (+3.11%) | final |
Full series: level-history.json · level-history.csv. Source: headline.json, written 2026-10-17T22:00:02.158Z.
At a glance
What this is
The RareEarth Index tracks the public companies whose primary business activity is rare earth element production. Modified market-capitalization weighting using free-float, with a 10% single-name cap and iterative pro-rata redistribution. Quarterly weight rebalances; semiannual full reconstitution.
Six eligibility screens, applied in order: activity, exclusion, listing, market-cap floor, liquidity floor, English reporting standard. Eligible exchanges are the named global venues only — NYSE, NASDAQ, TSX, TSXV (with liquidity waiver), ASX, LSE Main, LSE AIM, Oslo Børs, Euronext, HKEX, SGX. Companies listed exclusively on Shanghai or Shenzhen are out of scope.
The full rulebook is on the methodology page. The construction record for the inaugural composition is in the inaugural constituent note. Terms used across the site are defined in the glossary; common questions are answered on the FAQ page.
Composition
Fourteen constituents at inception; thirteen since August 19, 2026, when Australian Strategic Materials was deleted following its acquisition by Energy Fuels. Five names sit at the 10% single-name cap; eight carry their natural free-float weights. The full table, with sector classification and cap-binding indicators as of the Q3 2026 rebalance, is on the constituents page.
Companies that were considered and excluded are documented one by one, with reasons, in the audit trail. Every rare earth stock the index has screened — constituents, the deleted name, and the excluded — is listed with its status on the rare earth stocks page. How the methodology differs from the VanEck REMX ETF is set out on the REMX comparison page.
Calendar
The Q3 2026 rebalance was applied as of the September 18, 2026 close. The first semiannual reconstitution is December 18, 2026; the next quarterly rebalance after that is March 19, 2027. The full schedule, the log of every rebalance and deletion, and the October 2026 correction notice are on the reconstitution page.
Data
The daily level series, the headline figures and the rebalance periods behind every level are published as JSON and CSV under /data/, updated after each daily run at 22:00 UTC, under a CC BY 4.0 licence with attribution to Clay Indices. The data page documents each file and how to cite the index.
The voice
There is no marketing layer over the math. The methodology speaks; the index reflects what it produces.