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Douglas S Knopper

CIK 1350876 · last filed 2026-06-17

Douglas S Knopper is a corporate insider who has filed 20 SEC Form 4 insider transactions across 4 companies since 2007. The most recent filing shows the insider sold $675.8K of MGNI on Jun 17, 2026. Across all open-market trades the lifetime net is −$1.6M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $2.5M 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.

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Disclosed Exposure

$2.48M

Companies

4

Total Filings

20

Lifetime Open-Market Net

-$1.58M

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
MGNI Director 125,810 $19.70 $2.48M -$1.58M 10 2026-06-17
RUBI Director 2 $2.16 $4 $0 1 2020-04-03
Telaria, Inc. (TLRA) Delisted Director 84,757 — — $0 3 2019-10-17
MEDIALINK WORLDWIDE INC (MDLK) Delisted Director — — — $0 3 2009-01-06

Recent Filings

20 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
2026-06-17 MGNI Sell (S) −37,337 -$675.8K EDGAR
2026-06-16 MGNI Notice (144) −37,337 -$625.4K EDGAR
2026-06-10 MGNI Notice (144) −10,766 -$170.2K EDGAR
2026-06-10 MGNI Mixed +3,032 -$169.3K EDGAR
2025-06-06 MGNI Grant (A) +10,766 $0 EDGAR
2024-06-13 MGNI Grant (A) +14,061 $0 EDGAR
2023-06-16 MGNI Grant (A) +13,743 $0 EDGAR
2022-06-09 MGNI Grant (A) +16,489 $0 EDGAR
2021-07-13 MGNI Sell (S) −10,200 -$334.4K EDGAR
2021-06-30 MGNI Grant (A) +3,936 $0 EDGAR
Showing 1–10 of 20
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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.