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The Chokepoint

Your weekly guide to the chokepoints in the AI supply chain

The Chokepoint

The Chokepoint #9: Selective Etching

Jul 1, 2026

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7 min read

The Chokepoint #9: Selective Etching

The 2nm bottleneck is somewhere else. One etch step, three suppliers.

Teng Yan
Arvind
Teng Yan, +1

The Chokepoint

The Chokepoint #8: Gas Turbines

Jun 24, 2026

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5 min read

The Chokepoint #8: Gas Turbines

Three companies make the world's big gas turbines. Two blade manufacturers decide how fast they can build them.

Teng Yan
Arvind
Teng Yan, +1

The Chokepoint

The Chokepoint #7: Optical Fibers

Jun 17, 2026

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5 min read

The Chokepoint #7: Optical Fibers

The AI fiber shortage is a glass-rod shortage and you can't make the rods on a GPU schedule.

Teng Yan
Arvind
Teng Yan, +1

The Chokepoint

The Chokepoint #6: Photonics Testing

Jun 10, 2026

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5 min read

The Chokepoint #6: Photonics Testing

AI's optical future depends on a test step only one company can run at scale

Teng Yan
Arvind
Teng Yan, +1

The Chokepoint

The Chokepoint #5: Power Transformers

Jun 3, 2026

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5 min read

The Chokepoint #5: Power Transformers

America's AI grid runs through one Pennsylvania steel mill

Teng Yan
Arvind
Teng Yan, +1

The Chokepoint

The Chokepoint #4: ABF Substrates

May 27, 2026

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5 min read

The Chokepoint #4: ABF Substrates

No high-end processor ships without a film made by Ajinomoto.

Teng Yan
Arvind
Teng Yan, +1

The Chokepoint

The Chokepoint #3: Power Semis

May 19, 2026

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5 min read

The Chokepoint #3: Power Semis

Power semiconductors are the new chokepoint.

Teng Yan
Arvind
Teng Yan, +1

The Chokepoint

The Chokepoint #2: Photonics

May 12, 2026

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5 min read

The Chokepoint #2: Photonics

Where the rent flows when light becomes the chokepoint

Teng Yan
Arvind
Teng Yan, +1

The Chokepoint

The Chokepoint #1: Power

May 6, 2026

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4 min read

The Chokepoint #1: Power

The rent is migrating from the fab to the substation.

Teng Yan
Teng Yan

Tessara

Daily signals on the AI infrastructure supply chain. What's tightening, what's breaking, and who's exposed. By Chain of Thought