As of March 13, 2026

Bifurcated day. Materials and foundries bid, active optics dumped. $LWLG +7.49%, still ripping off the Tower Semi PH18 deal — EO polymer modulators going into a real foundry PDK targeting 400G per-lane. 43% two-day move. Market's repricing this from science project to actual AI optical infrastructure (benzinga.com/trading-id…). $AAOI -8.83% on the other end — doubled its ATM to $500M, textbook dilution overhang crushing the $200M+ 1.6T order narrative (benzinga.com/trading-id…).

Rotation is real. Money leaving parabolic transceiver names, flowing into upstream substrate and foundry plays. LWLG-TSEM validates polymer photonics for the 800G-to-1.6T migration. InP substrate demand (AXTI, $IQE, $SOI) still strong on hyperscaler procurement. $SPX/

$NDX barely red — this is sector action, not macro.

$LWLG: +7.49%

$BESIY: +5.21%

$TSEM: +5.20%

$AXTI: +4.56%

$IQE: +2.42%

$SOI: +2.40%

$FORM: +1.79%

$LITE: +1.04%

$GFS: +0.65%

$COHR: +0.62%

$MRVL: +0.22%

$CIEN: +0.16%

$ALMU: +0.07%

$GLW: -0.50%

$SPX: -0.61%

$NDX: -0.62%

$KEYS: -1.06%

$AEHR: -5.26%

$POET: -8.20%

$AAOI: -8.83%

1. Photonic Materials

$LWLG: The catalyst. PH18 PDK integration = EO polymer tech on a scalable foundry. Four Fortune 500 in Stage 3. Market finally pricing this as embedded infra, not a bet.

2. Compound Semi Substrates

$AXTI, $IQE, $SOI: InP substrate plays keep working. Hyperscaler procurement pulling wafer demand as 800G/1.6T builds ramp.

$GLW: -0.50%, holding better than index. Diversified enough to stay defensive.

3. Foundries

$TSEM: +5.20%, direct LWLG deal read-through. PH18 = the AI SiPho foundry platform now.

$GFS, $ALMU: Modest sympathy. Capacity stays tight.

4. Transceivers & Active Optics

$LITE, $COHR, $MRVL, $CIEN: Muted gains. Consolidating post-NVIDIA investment rally. Digesting, not breaking.

$AAOI: ATM doubling to $500M kills momentum. Doesn't matter you just got a $200M+ 1.6T order when you dilute this hard at these levels.

$POET: -8.20% sympathy with AAOI. Optical interposer still early stage.

5. Equipment & Test

$BESIY: +5.21%, $FORM: +1.79% — litho and probe card demand on advanced packaging cycle.

$AEHR: -5.26%. SiC-to-AI pivot still not showing in the numbers. Q2 rev down 27% YoY.

$KEYS: -1.06%, tracking index.