Innolight falls below a trillion yuan as four senators take aim at China's optical modules

The first trading day after the Mid-Autumn holiday repriced the parts that move data between the servers of AI data centers. Zhongji Innolight fell 6.22% to 840.15 yuan on 28 September and closed at 990 billion yuan, giving up the trillion-yuan market cap ¹. The company says it has ranked as the world's largest optical-interconnect provider by revenue for five straight years, citing consultant CIC in its Hong Kong listing prospectus↗ ².

Eoptolink, the other module maker named in the bill, fell 5.47% ¹. Main funds pulled 98.6 billion yuan out of communications equipment, the largest outflow of any Chinese industry that day ¹.

Four senators filed the day after the summit

On 25 September, the day after Trump and Xi met in Washington ⁴, Republicans John Cornyn and Dave McCormick and Democrats John Fetterman and Ruben Gallego filed S.5548, formally "a bill to prohibit Federal procurement of certain optical transceivers"↗ ⁵. It would push Innolight and Eoptolink hardware out of the government's most sensitive national-security systems: transceivers that AI data centers buy by the million ⁶.

"We shouldn't rely on China for technologies that are essential to our national security," McCormick said ⁶. Agencies would get five years to comply, and the Commerce and Defense secretaries could add companies to the list ⁶. Innolight has sat on the Pentagon's 1260H list since 8 June without a reported order cancelled ², and a former Trump White House official was lobbying to lift the designation before the summit↗ ⁷.

Both camps admit the dependency

The carve-outs are arithmetic, not timidity. The United States bought 61.7% of Innolight's first-quarter revenue, up from 57.3% for all of 2025, on quarterly revenue that nearly tripled to 19.5 billion yuan ². Chinese firms supplied nearly two-thirds of the world's transceivers by volume and booked 60% of optical datacom transceiver revenue in 2025, Counterpoint Research counts ⁸.

Coherent and Lumentum "lack the scale to replace Chinese vendors," the Foundation for American Innovation found, and the ITI lobby urged the FCC on 13 August to keep transceivers off its blacklist ⁶. The FCC's September rule update left them out↗ ⁸. That split says who pays: hyperscaler buyers keep the supply flowing, federal agencies carry the five-year compliance bill, and Chinese exporters' shareholders took Monday's mark.

Two homegrown legs under the selloff

The bill was not Monday's only fuel. Hengtong Optic-Electric and FiberHome hit the 10% limit down ¹³, and Hengtong had just unveiled a placement of up to 66.36 billion yuan, near 30% dilution, after negative first-half operating cash flow ¹. Oracle, for its part, issued a force-majeure notice over a rejected gas pipeline that throws a 2028 data-center start into doubt; its $18 billion syndicated loan traded at a discount ¹.

For now the bill sits at proposal stage, excludes commercial data centers, and leaves order books at Innolight and Eoptolink full ¹. The steepest falls of the day, the fiber names, trace to homegrown news, not Washington.

The trade of the year, marked down

Until Monday this was China's trade of the year: exporters up 36% against 9% for domestically focused peers, with Innolight and Eoptolink near 50% ⁹. The next tell is the FCC's Covered List, the target of a House overhaul bill on 23 September↗; the FCC could use the list to bar imports of new Chinese transceiver models ⁴. A five-year clock is not a ban. It is a schedule for living with the dependency, written by the country that cannot yet replace it.