Lightspeed General Partner IX, L.P.
CIK 1913317 · last filed 2026-07-09
Lightspeed General Partner IX, L.P. is a corporate insider who has filed 6 SEC Form 4 insider transactions across 2 companies since 2025. The most recent filing, for RBRK, was dated Jul 13, 2026. Across all open-market trades the lifetime net is −$28.0M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $124.3M across reported positions. The firm reports its address in Menlo Park, CA. 9 SEC filings were submitted jointly with Lightspeed Ultimate General Partner IX, Ltd.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
NTSK price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
MENLO PARK, CA 94025
Holdings By Company
Recent Filings
6 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-07-13 | RBRK | Notice (144) | −7,592 | -$636.2K | EDGAR |
| 2026-07-09 | NTSK | Mixed | — | -$28.04M | EDGAR |
| 2026-06-26 | RBRK | Notice (144) | −7,592 | -$538.5K | EDGAR |
| 2025-12-12 | RBRK | Notice (144) | −10,123 | -$881.5K | EDGAR |
| 2025-06-30 | RBRK | Mixed | +4,268,320 | $0 | EDGAR |
| 2025-06-27 | RBRK | Notice (144) | −32,396 | -$2.82M | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.