Key points
- Sivers Semiconductors closed at SEK 37.06 in Stockholm Tuesday, up 18.9%. The US line (SIVEF) traded at $3.93, up 18%.
- Reuters reported the FCC is drafting a ban on imports of new Chinese optical transceiver models, with exemptions for many non-Chinese suppliers.
- Sivers supplies the DFB lasers for a 1.6T transceiver module Jabil announced plans to build in April. No customer or revenue date has been disclosed.
- Q2 results come August 27. A closed period has run since July 28, so no insider transactions are disclosed before then.
Sivers Semiconductors had a good day on Tuesday. In Stockholm the stock closed at SEK 37.06, up 18.86%. The same shares trade over the counter in the US under the ticker SIVEF, and those were up 18% at $3.93 in early-afternoon trading.
The company's most recent press release is dated July 31. It reports the total number of shares and votes. Swedish financial paper Affärsvärlden attributed the day's move to a report out of Washington.
Reuters reported Tuesday morning that the Trump administration is drafting a ban on US imports of new models of Chinese optical transceivers, the parts that carry data as light over fiber inside a data center. The FCC is writing the rule, and officials hope to publish it this year. Under the draft as reported, the agency would ban all new transceiver models, then exempt many non-Chinese suppliers. "Transceivers definitely pose a risk. As the data center buildout scales up, you want to make sure the supply chain is secure from the get-go," Divyansh Kaushik, an AI policy expert at Beacon Global Strategies, told Reuters. China's embassy in Washington said it "will take all necessary measures in response to any action that causes material harm to its interests."
The rest of the optical group moved the same way. Applied Optoelectronics rose the most, off a July 29 close of $76.52.
| Stock | Monday close | Tuesday, 2:27 p.m. ET | Change |
|---|---|---|---|
| Applied Optoelectronics (AAOI) | $110.21 | $135.67 | +23.1% |
| Fabrinet (FN) | $455.94 | $538.25 | +18.1% |
| POET Technologies (POET) | $7.36 | $8.57 | +16.4% |
| Coherent (COHR) | $288.14 | $332.77 | +15.5% |
| Lumentum (LITE) | $779.89 | $861.68 | +10.5% |
| Ciena (CIEN) | $390.76 | $414.53 | +6.1% |
Where Sivers sits in a transceiver
Sivers' photonics unit builds DFB laser arrays on an indium phosphide platform at a 100mm wafer foundry in the UK. The head office is in Kista, Sweden. Those lasers are a component. Other companies build the finished transceiver around them.
One of those companies is Jabil, the contract manufacturer based in St. Petersburg, Florida. Sivers announced on April 15 that Jabil plans to develop a 1.6T linear receive optical transceiver module using Sivers' DFB lasers. "Our customers are pushing for more bandwidth without increasing power consumption," said Jason Wildt, vice president and general manager of photonics at Jabil, in that release. The announcement named no customer and gave no revenue date.
Sivers also supplies laser arrays for an eight-channel external light source module announced March 17 with O-Net Technologies and Enablence Technologies. An external light source keeps the lasers outside the switch package, away from the heat of the processor. O-Net is the ODM partner there, handling manufacturing and integration. O-Net Technology (Group) is based in Shenzhen and went public in Hong Kong in 2010. Huawei has been a customer for years. Reuters never names O-Net in the report, and the draft covers transceivers rather than light-source modules.
Q2 results are due August 27
Not one of those deals has produced a purchase order yet. The Jabil module, the O-Net module and a separate GlobalFoundries collaboration are all development agreements, with no named customer and no revenue date. They stood the same way when we went through the short-seller allegations and the July insider buying. Short seller Ningi Research said in June that about 31% of Sivers' 2025 revenue is dubious. Sivers hasn't published a detailed rebuttal. When the 2025 annual report came out in May, the auditors raised going-concern doubt. Sivers booked SEK 306.6 million in revenue for the year, against a net loss of SEK 222.6 million.
Sivers reported 355,081,317 ordinary shares and votes on July 31, after the July directed placement and the Bootstrap Europe debt conversion. Some screeners were still carrying numbers implying about 290 million shares last week. At Tuesday's Stockholm close the market value works out near SEK 13.2 billion, about $1.4 billion.
Two directors and three funds tied to one of them sold 8,839,914 shares between July 16 and July 22, worth about $31.4 million. That was the week the insider lockup expired. Chief executive Vickram Vathulya went the other way, buying 70,000 shares in the same window. He holds 4,540,076. Across that stretch the stock fell from SEK 47.28 to SEK 30.70. Tuesday's close is still under where it started.
Q2 results come August 27, before the Stockholm open. No insider transaction will show up in Sweden's register before then either way. Sivers' July 21 release put it plainly: "In accordance with Article 19(11) of the EU Market Abuse Regulation, a closed period applies from July 28, 2026 until publication of the report, during which persons discharging managerial responsibilities may not conduct transactions in the Company's financial instruments."
Sources
- Reuters, "Trump administration drafting ban on Chinese data center devices, sources say," by Alexandra Alper, August 4, 2026
- Sivers Semiconductors collaborates with Jabil on energy efficient 1.6T pluggable optical transceiver module, April 15, 2026, source of the Wildt quote
- Sivers Semiconductors, O-Net and Enablence Technologies announce external light sources for AI datacenters, March 17, 2026
- Sivers Semiconductors, "Update on Expiry of Lock-up Undertaking and Insider Transactions," July 21, 2026
- Insider transaction totals from Finansinspektionen's PDMR register, dated July 16 to July 22, 2026. Prices from Nasdaq Stockholm's August 4 close, a SIVEF quote at 2:06 p.m. ET on 577,563 shares, and live US quotes for the comparison table taken at 2:27 p.m. ET, with the US session still open
