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 $75.0M across reported positions.

"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.

Disclosed Exposure

$75.00M

Companies

2

Total Filings

6

Lifetime Open-Market Net

-$28.04M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.

Symbol	Role	Shares	Price	Disclosed Exposure	Lifetime OM Net	Filings	Latest Filed
NTSK	10%+ Owner	10,621	$11.17	$118.6K	-$28.04M	1	2026-07-09
RBRK	10%+ Owner	1,031,000	$72.63	$74.88M	$0	1	2025-06-30

Recent Filings

6 filings

Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.

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

Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.