Insider and mega-holder ownership levels
What the board actually holds, month by month, drawn against the share of the float sitting in accounts over a thousand lots. Taiwan requires directors and supervisors to file their combined holding and their pledge ratio every month — a running level, not a stream of transactions, which is something most markets do not publish at all.
- Insider disclosure in most markets is event driven, so you can see the trades and still not know the level. Here the level is the filing.
- Insiders and large accounts moving the same way is a different reading from either moving alone — which needs both lines on one axis.
- The pledge ratio is leverage sitting behind the insider position, and it is invisible if you only look at how much they hold.
Try it
Solid dark line is the monthly insider holding ratio, gold is the weekly mega-holder ratio, and the dashed red line is the pledge ratio on the right axis. Drag the zoom bar to narrow the window. The free tier covers the demo ticker 2330.
How it is built
Two official filings on two different cadences, plus one denominator that has to be handled honestly. The fourth step is the one worth reading.
Directors file their holdings every month
Every listed company reports the combined shareholding of its whole board of directors and supervisors on a monthly cycle, together with the share of that holding which has been pledged as loan collateral. Both figures are taken as filed. Most markets have no monthly equivalent — insider disclosure elsewhere is usually event driven, so you see transactions but never a running level.
Mega-holder share comes from the weekly depository breakdown
The central depository publishes a weekly distribution of every ticker's holders by size band. The share held by accounts sitting on 1,000 lots or more is what is plotted here as the mega-holder line. It carries both a data date and the date it became publicly available, and the coverage note under the chart states the window actually returned rather than implying the series runs the full history.
Two clocks on one axis, neither resampled
The insider line is monthly, the mega-holder line weekly. They are drawn on a shared time axis without upsampling the slower one or smoothing the faster one. Insiders and large accounts pulling back at the same time is a different reading from either moving alone, and that is only visible if both keep their own cadence.
The denominator is derived, and says so
Holding percentage needs a share count outstanding. Where the filed figure is not available the count is backed out from the official market-capitalisation panel divided by the same day's close, which is an approximation rather than a filed number. The numerator — shares held, and the pledge ratio — is always the filed value. Which of the two denominators was used on a given call is printed with the result, because a percentage whose denominator is estimated deserves to be read differently from one whose denominator is filed.
Terms
Four words carry this page:
Where the line is
This page reports levels that were filed. It does not report intent. A board whose combined holding fell six points over two years did hold less at the end of it — but whether that came from selling, from transfers, from dilution, or from a single director leaving is not in the monthly filing, and the honest version of this chart cannot tell you. The cross-source ownership timeline goes one layer closer to that question by putting the individual transfer filings on a date axis, and it still stops short of outcomes, because a pre-declaration is an intention rather than a completed sale.
The mega-holder line has a matching limit. It is a ratio with no identities attached, so the accounts behind it on two different dates need not be the same people. Rising concentration is a fact about the distribution of the float and not evidence about who is accumulating. Neither line here was chosen, smoothed or thresholded by checking which version would have lined up best with subsequent returns.
FAQ
What does a falling insider holding ratio tell me?
That the combined position of the board shrank over that stretch, and nothing about why. Shares can leave an insider position through a sale, a transfer, an estate, or dilution that leaves the share count unchanged while the total grows. The filing carries the level, not the reason. Reading a decline directly as insiders losing faith is adding something the disclosure does not contain.
Why does the mega-holder line start much later than the insider line?
Because the two come from different filings with different histories. The monthly insider series on a long-listed company can reach back to the late 1990s, while the weekly depository distribution used here begins in 2019. The coverage note under the chart prints the actual window returned for each of the two, so the gap is stated rather than hidden by a line that quietly begins mid-chart.
Is the holding percentage exact?
The share count on top is filed and exact. The denominator may be derived from the official market-cap panel rather than filed, and the current share count is applied across the whole history, so a company that issued a lot of stock over the years will show early percentages that are approximate. The footnote under the chart states which denominator was used. If you need exactness on a historical date, read the share count rather than the percentage.
Why does the pledge ratio sit on its own axis?
Because it is a share of the insider position, not a share of the company, and the two typically live on very different scales. Plotting a 40 percent pledge ratio against a 5 percent holding ratio on one axis would flatten the line that most readers came for. The right axis is labelled and the dashed line is the pledge series.
Do I need a paid tier?
The demo ticker (2330) runs the full chart with no signup. Arbitrary tickers are a paid tier, as is as-of history across the whole universe. The chart, the coverage note and the derivation footnote are identical either way — the paid tier widens coverage, it does not unlock a different number.
Run it yourself
The free tier needs no signup — call this feature's API straight away with the demo key. Unlock as-of history and full ticker coverage on a paid tier.