1 insider bought €349k of shares over the last 90 days, the latest by 株式会社エヌオーアイ, filed 29 Sept 2026.
Seika Corporation: what insiders have been doing
Seika Corporation is a Industrials company. Its directors and officers file their transactions with EDINET (Japan FSA). 2 insiders have disclosed 7 filings since 26 October 2025.
The flow runs one way only: 1 insider bought (6 purchases) and nobody sold on the market. The amount is not disclosed for 6 filings. Open-market purchases are the filings investors watch most closely, because the insider pays for the shares out of pocket. The buyers include 1 major shareholder.
For context, the typical company on the same exchange (median of 3,205 companies) published 3 filings over the same period, against 7 filings here. The full history, which starts in 2021, counts 130 purchases against no sales.
The clock since the last published purchase (29 September 2026) now reads 41 days. Between a trade and the moment it shows up on EDINET (Japan FSA), the median delay is 36 days. That lag is the time during which only the insider knows about the trade.
Every figure here comes from the filings published by EDINET (Japan FSA) and describes the past, not future prices; it is not investment advice.
Who traded when
BuySaleSince the insiders bought
- +59.7%Entry JP¥513 · Close at T+365 JP¥820
- Unknown-2.0%Entry JP¥538 · Close at T+365 JP¥527
Entry is the close on the day after publication, the first price a reader could act on. Prices in the listing currency. Past moves are not a forecast.
This score ranks the purchase within its own market. A position size is suggested only on the venues of the backtested strategy universe; elsewhere, signals stay on watch. Not investment advice.
Transparent value + quality ranking, distinct from the insider signal.
Financial data
as of FY 2026FY ended March 2026 · cache
- 3,300 sharesShareXTKSEDINET:S100Z4BK:T13Canonical exit: 23 Nov 2026 (T+90)
- ShareXTKSEDINET:S100Z4BK
- 6,800 sharesShareXTKSEDINET:S100Z4BK:T10Canonical exit: 17 Nov 2026 (T+90)
- 3,200 sharesShareXTKSEDINET:S100Z4BK:T9Canonical exit: 16 Nov 2026 (T+90)
- 3,300 sharesShareXTKSEDINET:S100Z4BK:T11Canonical exit: 18 Nov 2026 (T+90)
- 3,300 sharesShareXTKSEDINET:S100Z4BK:T12Canonical exit: 22 Nov 2026 (T+90)
- 1,600 sharesShareXTKSEDINET:S100Z4BK:T14Canonical exit: 2 Dec 2026 (T+90)
- 18.9% of flowShareXTKSEDINET:S100WG8E
- 20.1% of flowShareXTKSEDINET:S100VPBS
- 20.3% of flowShareXTKSEDINET:S100V9PG
- 20.6% of flowShareXTKSEDINET:S100UWDO
- 20.2% of flowShareXTKSEDINET:S100S70H
- ShareXTKSEDINET:S100SB3W
- ShareXTKSEDINET:S100RS86
- ●Unknown5EDINET0.1% of flowShareXTKSEDINET:S100PFWT
- 1,800 sharesShareXTKSEDINET:S100PFWT:T4Canonical exit: 6 Dec 2022 (T+90)
- 1,700 sharesShareXTKSEDINET:S100PFWT:T5Canonical exit: 7 Dec 2022 (T+90)
- 3,600 sharesShareXTKSEDINET:S100PFWT:T6Canonical exit: 8 Dec 2022 (T+90)
- 2,300 sharesShareXTKSEDINET:S100PFWT:T9Canonical exit: 13 Dec 2022 (T+90)
- 1,500 sharesShareXTKSEDINET:S100PFWT:T11Canonical exit: 15 Dec 2022 (T+90)
- 2,100 sharesShareXTKSEDINET:S100PFWT:T12Canonical exit: 19 Dec 2022 (T+90)
- 2,100 sharesShareXTKSEDINET:S100PFWT:T13Canonical exit: 20 Dec 2022 (T+90)
- 1,500 sharesShareXTKSEDINET:S100PFWT:T14Canonical exit: 21 Dec 2022 (T+90)
- 5,400 sharesShareXTKSEDINET:S100PFWT:T15Canonical exit: 25 Dec 2022 (T+90)
- 2,700 sharesShareXTKSEDINET:S100PFWT:T20Canonical exit: 1 Jan 2023 (T+90)
25 of 145 declarations
About Seika Corporation
西華産業株式会社 is a Japanese company operating in the industrial sector. It is listed on the XTKS market.
