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David Nierenberg

CIK 1040899 · last filed 2023-12-15

David Nierenberg is a corporate insider who has filed 97 SEC Form 4 insider transactions across 10 companies since 2007. The most recent filing shows the insider bought $72.5K of FTK on Dec 15, 2023. Across all open-market trades the lifetime net is −$67.7M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $20.8M across reported positions. 194 SEC filings were submitted jointly with Nierenberg Investment Management Company, LLC.

"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

$20.76M

Companies

10

Total Filings

97

Lifetime Open-Market Net

-$67.74M

Filer Profile

Reported Address
19605 NE 8TH STREET
CAMAS, WA 98607
Related Filers
Nierenberg Investment Management Company, LLC — 194 joint filings, latest 2025-03-31
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

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
FTK Director 835,079 $23.54 $19.66M $5.68M 26 2023-12-15
ROSETTA STONE INC (RST) Delisted Director 0 — — -$14.43M 16 2020-10-16
RVSB Director 130,869 $5.32 $696.2K $637.0K 6 2020-03-17
Houston Wire & Cable CO (HWCC) Delisted Director 664,888 $5.30 $3.52M $1.60M 1 2020-03-17
ELECTRO SCIENTIFIC INDUSTRIES INC (ESIO) Delisted Director 2,048,494 — — $2.81M 7 2015-05-18
ASSET ACCEPTANCE CAPITAL CORP (AACC) Delisted 10%+ Owner 2,787,899 — — $25.32M 12 2013-04-16
MOVE 10%+ Owner 27,708 $14.74 $408.4K -$95.19M 7 2012-11-29
NATUS MEDICAL INC (BABY) Delisted 10%+ Owner 422,738 — — -$53.35M 6 2010-03-09
MEXICAN RESTAURANTS INC (CASA) Delisted 10%+ Owner 0 $0.04 $0 -$14.32M 1 2009-12-02
MEDCATH CORP (MDTH) Delisted 10%+ Owner 558,166 — — $73.50M 6 2008-08-27

Recent Filings

97 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
2023-12-15 FTK Buy (P) +19,481 $72.5K EDGAR
2023-12-13 FTK Buy (P) +54,859 $189.2K EDGAR
2023-07-05 FTK Grant (A) +241,096 $0 EDGAR
2023-06-09 FTK Sell (S) −750,000 -$468.8K EDGAR
2023-01-24 FTK Grant (A) +13,179 $0 EDGAR
2022-08-08 FTK Grant (A) +165,289 $0 EDGAR
2022-03-23 FTK Conv (C) +2,793,030 $0 EDGAR
2022-02-04 FTK Buy (P) — $0 EDGAR
2021-06-21 — Disp (D) −4,086,716 $0
2021-06-07 FTK Grant (A) +103,774 $0 EDGAR
Showing 1–10 of 97
Page 1 of 10
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.