Key points
- Jane Street's 0.51% short in Sivers Semiconductors (SIVEF) fell back below Sweden's 0.5% disclosure line on Aug. 5, a day after it was named.
- D.E. Shaw's short, opened the same week, is still public at 0.62%. It's now the only individually named short seller in Sivers.
- Total short interest in Sivers is 3.13% of shares, per Finansinspektionen, up slightly even as Jane Street's named position came off the list.
- Next catalyst: Sivers reports second-quarter results Aug. 27, before the open on Nasdaq Stockholm.
Update, August 6: Jane Street's short is off the public list
Jane Street Group LLC's net short position in Sivers Semiconductors fell back below Sweden's 0.5% public-disclosure threshold on August 5, one day after it first crossed above it. Finansinspektionen's register now lists the position as "<0.5%" effective that date, moved from the current-positions table to historical.
The regulator doesn't publish an exact number once a position drops under 0.5%. Jane Street's actual position could be anywhere from zero up to just under 0.5% of Sivers' share capital. Some short-interest trackers display a sub-threshold position as 0.00% by convention; that's an assumption, not something the register itself states.
D.E. Shaw & Co LP's short is still on the public list, unchanged at 0.62% as of its August 4 filing. It's now the only individually named short seller in Sivers.
Total reported short interest in Sivers stands at 3.13% of the share capital, up slightly from 3% two days earlier even as Jane Street's named position came off the list. That means positions too small to be individually named, the ones between 0.1% and 0.5%, grew.
Jane Street's is the fastest round trip of any fund that has shown up in Sivers' register this year. The next-shortest was Walleye Capital, on the public list for about two weeks last April. Voleon Capital Management and Two Sigma Investments each stayed on it for about eleven weeks, from early May to late July, before dropping below the line.
Sivers shares were trading around SEK 36 in Stockholm Thursday afternoon, up from Wednesday's SEK 33.96 close. The US line, SIVEF, changed hands near $3.78 in Thursday's New York morning.
Jane Street Group LLC now holds a publicly disclosed short position in Sivers Semiconductors. Sweden's Finansinspektionen put it at 0.51% of the issued share capital, dated August 4, in a register update posted Wednesday afternoon. The firm's previous position sat below the 0.5% level at which the regulator publishes a holder's name.
D.E. Shaw & Co LP appears on the same list at 0.62%, also dated August 4. That's up from 0.59% the day before, which was its first entry in the register.
Between July 23 and August 2 the list was empty. Voleon Capital Management dropped below the disclosure line on July 23. Two Sigma Investments had gone under it two days earlier, after running a position as large as 1.44% on July 8.
The register's Sivers entries, most recent first:
| Position holder | Position | Position date | Previous |
|---|---|---|---|
| D.E. Shaw & Co LP | 0.62% | Aug 4 | 0.59% |
| Jane Street Group LLC | 0.51% | Aug 4 | below 0.5% |
| D.E. Shaw & Co LP | 0.59% | Aug 3 | below 0.5% |
| Voleon Capital Management LP | below 0.5% | Jul 23 | 0.59% |
| Two Sigma Investments LP | below 0.5% | Jul 21 | 0.5% |
| Two Sigma Investments LP | 1.44% | Jul 8 | 1.15% |
Sivers reported 355,081,317 ordinary shares and votes in a July 31 release. Jane Street's 0.51% works out to about 1.81 million shares. D.E. Shaw's 0.62% comes to about 2.2 million. Together that's a little over 4 million shares, worth around SEK 136 million, or close to $14.3 million at Wednesday's close.
What the register says, and what it doesn't
Swedish rules require a fund to notify Finansinspektionen once its net short position passes 0.1% of a company's issued share capital. The name is published only above 0.5%. "Significant short net positions are positions that have passed 0.5 per cent of the issued share capital," the regulator says on the register page.
Total reported short interest in Sivers stands at 3% of the share capital. Jane Street and D.E. Shaw account for 1.13 percentage points of that. The rest belongs to holders sitting between 0.1% and 0.5%, and those names aren't published.
However, the register doesn't say why anyone is short, and it doesn't separate a directional bet from a hedge. Finansinspektionen doesn't check the filings before posting them either. "The data in this register is published automatically upon receipt of a notification to FI. The data is not reviewed prior to publication," the page says.
The stock gave back Tuesday's gain
Sivers closed at SEK 33.96 in Stockholm on Wednesday, down 8.36%. It opened at 37.58, a little above Tuesday's close of 37.06.
Tuesday was the up day. The stock rose 18.86% on a Reuters report that the FCC is drafting a ban on US imports of new Chinese optical transceiver models. Sivers supplies DFB lasers for a 1.6T transceiver module that Jabil said in April it plans to build.
The US line trades over the counter as SIVEF. It changed hands at $3.75 at 12:21 p.m. Eastern on Wednesday, against Tuesday's close of $3.88, on 430,139 shares.
Second quarter results are due August 27, before the open on Nasdaq Stockholm. A closed period under EU market abuse rules has run since July 28, so no insider transactions will be disclosed before the report lands.
Short seller Ningi Research published a report on June 1 arguing that about 31% of Sivers' 2025 revenue, some SEK 97 million, was dubious. Sivers hasn't published a rebuttal. Two US law firms opened investigations after that report. Bronstein, Gewirtz & Grossman still describes its Sivers matter as an investigation into potential claims, with no class period and no lead plaintiff deadline.
Finansinspektionen updates the register on weekday afternoons. Wednesday's list went up at 15:33 Stockholm time.
Sources
- Finansinspektionen, net short positions register, current and historic positions for Sivers Semiconductors AB (LEI 254900UBKNY2EJ588J53), list updated August 5, 2026 at 15:33 CEST
- Sivers Semiconductors, "Change in the Total Number of Shares and Votes in Sivers Semiconductors AB," July 31, 2026, source of the 355,081,317 share count
- Stockholm and US over-the-counter prices from Yahoo Finance, August 5, 2026, cross-checked against StockAnalysis for the Stockholm close. Dollar conversions use a USD/SEK rate of 9.4957
- Finansinspektionen, net short positions register, update pulled August 6, 2026, showing Jane Street Group LLC's position moved to historical at "<0.5%" effective August 5, 2026, and total short interest at 3.13%
- Stockholm and US over-the-counter intraday prices from Yahoo Finance, August 6, 2026 (SIVE.ST around 16:05 CEST, SIVEF around 9:50 a.m. Eastern)
