Nvidia invested $2 billion in Coherent; insiders sold $1.1 billion in a year and bought none

On October 9 Lumentum's▼−2.33% — Lumentum, down 2.33 percent today chief executive, Michael Hurlston, told Bloomberg in Tokyo↗ that his company's AI optical components are "completely sold out, so there's no end in sight," with about 70% of demand for some products unmet into next year ¹. Three trading days later the market sold the news anyway: Ciena closed down 10%, Lumentum down 9.8%, and Coherent▼−0.70% — Coherent, down 0.70 percent today, which makes the lasers and transceivers that move data inside AI data centers, down 7.9% at $288.02 ². The Roundhill Photonics & Optics ETF, the fund that holds the group, dropped 7% while the S&P 500 was flat ³.

Nvidia is buying supply security in both American optical makers

Coherent's definitive proxy statement, filed October 9↗, discloses a multiyear strategic agreement with Nvidia▲+0.29% — Nvidia, up 0.29 percent today: a multibillion-dollar purchase commitment plus a $2 billion equity investment to fund research and development, capacity and US manufacturing ⁴. Nvidia made the same-sized investment in rival Lumentum earlier this year ¹. Coherent's fiscal 2026 revenue rose 22.5% to $7.12 billion, and datacenter and communications revenue grew 40% to $5.27 billion ⁴.

Coherent's own insiders sold $1.1 billion and bought none

Morningstar analyst Martin Szumski said commentary from Broadcom▲+0.28% — Broadcom, up 0.28 percent today chief executive Hock Tan, who told a panel in Singapore↗ that capital is the biggest bottleneck in the AI buildout, "may have also sparked" Monday's moves; photonics revenue rides on committed spending from hyperscalers, the large cloud companies that provide computing power, so any hint that spending shifts can drag the group ². Szumski noted many of the photonics stocks had run up significantly over the last 18 months, leaving them exposed to anything but good news ². Meanwhile, GuruFocus's scan of Coherent's regulatory filings counts $1,117.0 million of insider sales over the past twelve months↗ with no buying ⁵.

Coherent trades at 70 times earnings while expansion outruns its cash

Coherent closed October 12 still at 70.0x trailing earnings and 30.7x forward, and the drop left the stock mid-range in a 52-week span of $108.19 to $440.00 ⁵. Count the money from its own filings: over the four quarters through June 2026↗ Coherent spent $1.10 billion on capital projects and generated $0.08 billion of operating cash flow, with negative free cash flow in each of the last three quarters ⁶⁷. Analysts' average target is $410.10, about 42% above the close ⁷. Ciena's math is the same shape: a 90.24 P/E, and $10.9 million of insider sales in three months ⁸.

The bulls' argument: the selloff reflects positioning, and the order book is intact

Giuseppe Sette, president and co-founder of Reflexivity, an AI investment analytics platform, told MarketWatch that Monday's action signaled no "crack in optical demand, which remains booked out for years"; a Monday demo at the Open Compute Project summit was already priced in and became "an exit point rather than a catalyst" ². Analysts mostly keep Buy ratings on Coherent ⁷. Fair. But an order book does not protect a multiple: Lumentum, up 516% in a year at 43x forward earnings, led the AI-optics selloff even with the fullest order book in the group ²³. And Coherent's expansion is being financed with capital spending that outruns cash generation ⁶.

What decides it: the next quarterly report

Coherent's next quarterly report is approaching ⁷. Lumentum guided $1.225 billion to $1.275 billion for the current quarter↗ against $1.006 billion last quarter, which will show whether a sold-out book converts to revenue on schedule ³. The tell for Coherent is its own cash flow statement: whether operating cash flow turns as the Nvidia-funded capacity ramps ⁶. Nvidia put $2 billion into Coherent ⁴ and $2 billion into Lumentum ¹, with purchase commitments, on one side of the ledger. Insiders put $1.1 billion of Coherent stock on the other ⁵.