What the executives and directors of Fortinet actually did with their own shares, decoded from their SEC Form 4 filings. Each figure says the stretch of time it covers.

The tape: three years of insider trades

Every marker sits at the price reported on the Form 4. The line is the monthly median of all prices insiders reported, so the chart needs no market feed; the grey strip is the routine flow (grants, vestings, tax withholding and gifts) that a headline gets wrong by counting it as selling. The share count changed 5-for-1 on Jun 23, 2022, so prices and share counts reported before then are restated to today's basis here; otherwise the tape would show a step the shares never took.

The 177 routine events on the chart, as a list

Date	Insider	Shares
Sep 15, 2026	Whittle John	57K
Aug 3, 2026	Xie Ken	155K
Aug 1, 2026	Xie Michael	9,491
Aug 1, 2026	Xie Ken	20K
Aug 1, 2026	Whittle John	6,883
Aug 1, 2026	Ohlgart Christiane	2,215
Jun 11, 2026	GOLDMAN KENNETH A	650
Jun 11, 2026	Hsieh Ming	650
Jun 11, 2026	Hu Jean X.	650
Jun 11, 2026	Sim Judith	650
Jun 11, 2026	STAVRIDIS JAMES G.	650
Jun 11, 2026	Napolitano Janet	650
Jun 4, 2026	Xie Michael	5,250
Jun 2, 2026	Xie Ken	155K
May 21, 2026	Whittle John	146K
May 19, 2026	GOLDMAN KENNETH A	1,500
May 19, 2026	Xie Michael	5.9M
May 1, 2026	Xie Michael	9,489
May 1, 2026	Xie Ken	20K
May 1, 2026	Whittle John	6,881
May 1, 2026	Ohlgart Christiane	6,645
Apr 17, 2026	Xie Ken	236K
Mar 31, 2026	GOLDMAN KENNETH A	649
Mar 31, 2026	Hsieh Ming	649
Mar 31, 2026	Hu Jean X.	649
Mar 31, 2026	Sim Judith	649
Mar 31, 2026	STAVRIDIS JAMES G.	649
Mar 31, 2026	Napolitano Janet	649
Feb 2, 2026	Xie Michael	324K
Feb 2, 2026	Xie Ken	135K
Feb 1, 2026	Xie Michael	60K
Feb 1, 2026	Xie Ken	131K
Feb 1, 2026	Whittle John	42K
Feb 1, 2026	Ohlgart Christiane	4,540
Dec 31, 2025	GOLDMAN KENNETH A	649
Dec 31, 2025	Hsieh Ming	649
Dec 31, 2025	Hu Jean X.	649
Dec 31, 2025	Sim Judith	649
Dec 31, 2025	STAVRIDIS JAMES G.	649
Dec 31, 2025	Napolitano Janet	649
Dec 5, 2025	Xie Michael	245K
Nov 3, 2025	Xie Ken	150K
Nov 1, 2025	Xie Michael	11K
Nov 1, 2025	Xie Ken	25K
Nov 1, 2025	Whittle John	6,905
Nov 1, 2025	Ohlgart Christiane	929
Sep 30, 2025	GOLDMAN KENNETH A	649
Sep 30, 2025	Hsieh Ming	649
Sep 30, 2025	Hu Jean X.	649
Sep 30, 2025	Sim Judith	649
Sep 30, 2025	STAVRIDIS JAMES G.	649
Sep 30, 2025	Napolitano Janet	649
Sep 8, 2025	Xie Michael	35K
Aug 4, 2025	Xie Ken	150K
Aug 1, 2025	Xie Michael	11K
Aug 1, 2025	Xie Ken	25K
Aug 1, 2025	Whittle John	6,906
Aug 1, 2025	Ohlgart Christiane	927
Jun 12, 2025	Wilderotter Mary Agnes	1,130
Jun 12, 2025	GOLDMAN KENNETH A	1,130

The 60 most recent of 177.

Where the shares went, last 12 months

Every Form 4 movement decomposed: what flowed in (grants, vested equity, purchases) and what flowed out (tax withholding, plan sales, discretionary sales, gifts). Counted in shares, because grants carry no price. The share count changed 5-for-1 on Jun 23, 2022, so share counts reported before then are restated to today's basis here.

The chart, in numbers

Flow	Shares
From holdings	3.4M
Vested / exercised	1.4M
Withheld for tax	117K
Planned sales (10b5-1)	705K
Discretionary sales	519K
Gifts	3.4M

Skin in the game

Directly held shares as reported after each trade, indexed to 100 at the start of the window, up to five years back. Direct holdings only: trust and family-entity positions are per-entity in the filings and do not sum honestly, so this chart refuses to guess. The steps are the trades. The share count changed 5-for-1 on Jun 23, 2022, so share counts reported before then are restated to today's basis here.

The chart, in numbers

Insider	Start of the window	Latest reported	Indexed, start = 100
Xie Ken	63M	53M	84.3
Xie Michael	30M	9.9M	33.3
Sim Judith	132K	130K	98.2

“Since trade” compares with the latest insider-implied price, not a market quote: these pages are built from filings alone. A role here is the one on that day's Form 4, so somebody promoted since appears under both titles. The share count changed 5-for-1 on Jun 23, 2022. This table prints prices and share counts as they were filed, on the basis of the day, while the charts above are on today's; “Since trade” puts the filed price on today's basis first, which is why it does not divide into the price beside it.

Filing hygiene

How to read this

A Form 4 transaction code decides everything. P is an open-market purchase and S an open-market sale; those two are the only codes where an insider chose to trade. A is a grant, M an option exercise or vesting, F shares withheld to cover tax, G a gift. Most “insiders dumped billions” headlines are code F and M mechanics.

Sales flagged 10b5-1 run on a plan the insider adopted in advance; since 2023 every Form 4 carries that flag. Buys have historically predicted returns, sales mostly have not, and this page states filings, not advice.

Every number on this page comes from Forms 3, 4 and 5 filed with the SEC. The insider export runs on its own schedule, so it can be a few days behind the rest of the site; the date below says how far it goes. Browse the source filings on SEC EDGAR. Data through Sep 18, 2026