Nierenberg David

CIK 1040899 · View on SEC EDGAR ↗

Insider Activist

First SEC filing: Oct. 16, 2020 · Latest: July 15, 2025

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Institution

View 13F portfolio

Insider at

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 24 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

24 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
Dec. 14, 2023 FTK P 748 $3.72 $2,783 47,907 Indirect +1.59% Acquired 551.9% (price as of 2026-08-20)
Dec. 14, 2023 FTK P 11,948 $3.72 $44,447 765,150 Indirect +1.59% Acquired 551.9% (price as of 2026-08-20)
Dec. 14, 2023 FTK P 6,785 $3.72 $25,240 434,580 Indirect +1.59% Acquired 551.9% (price as of 2026-08-20)
Dec. 13, 2023 FTK P 1,272 $3.53 $4,490 47,159 Indirect +2.77% Acquired 587.0% (price as of 2026-08-20)
Dec. 13, 2023 FTK P 20,310 $3.53 $71,694 753,202 Indirect +2.77% Acquired 587.0% (price as of 2026-08-20)
Dec. 13, 2023 FTK P 11,536 $3.53 $40,722 427,795 Indirect +2.77% Acquired 587.0% (price as of 2026-08-20)
Dec. 12, 2023 FTK P 858 $3.42 $2,934 45,887 Indirect +1.91% Acquired 609.1% (price as of 2026-08-20)
Dec. 12, 2023 FTK P 6,923 $3.42 $23,677 732,892 Indirect +0.95% Acquired 609.1% (price as of 2026-08-20)
Dec. 12, 2023 FTK P 4,954 $3.42 $16,943 416,259 Indirect +1.20% Acquired 609.1% (price as of 2026-08-20)
Dec. 11, 2023 FTK P 3,752 $3.19 $11,969 45,029 Indirect +9.09% Acquired 660.2% (price as of 2026-08-20)
Dec. 11, 2023 FTK P 5,254 $3.19 $16,760 411,305 Indirect +1.29% Acquired 660.2% (price as of 2026-08-20)
June 7, 2023 FTK S 211,080 $0.62 $130,870 2,436,303 Indirect -7.97% Disposed 551.9% (price as of 2026-08-20)
June 7, 2023 FTK S 538,920 $0.62 $334,130 4,355,810 Indirect -11.01% Disposed 551.9% (price as of 2026-08-20)
Feb. 2, 2022 FTK P 94,773 $0.87 $82,453 — Indirect — Acquired 364.6% (price as of 2026-08-20)
Feb. 2, 2022 FTK P 2,072,947 $0.87 $1,803,464 — Indirect — Acquired 364.6% (price as of 2026-08-20)
Feb. 2, 2022 FTK P 1,278,576 $0.87 $1,112,361 — Indirect — Acquired 364.6% (price as of 2026-08-20)
Nov. 30, 2020 FTK P 1,878 $2.05 $3,850 152,569 Indirect +1.25% Acquired 97.2% (price as of 2026-08-20)
Nov. 30, 2020 FTK P 37,070 $2.05 $75,994 3,011,673 Indirect +1.25% Acquired 97.2% (price as of 2026-08-20)
Nov. 30, 2020 FTK P 10,283 $2.05 $21,080 1,520,390 Indirect +0.68% Acquired 97.2% (price as of 2026-08-20)
Nov. 23, 2020 FTK P 16,260 $1.99 $32,357 150,691 Indirect +12.10% Acquired 103.1% (price as of 2026-08-20)
Nov. 23, 2020 FTK P 72,607 $1.99 $144,488 2,974,603 Indirect +2.50% Acquired 103.1% (price as of 2026-08-20)
Nov. 23, 2020 FTK P 60,693 $1.99 $120,779 1,510,107 Indirect +4.19% Acquired 103.1% (price as of 2026-08-20)
Sept. 15, 2020 FTK P 717 $2.53 $1,814 134,431 Indirect +0.54% Acquired 59.8% (price as of 2026-08-20)
Sept. 15, 2020 FTK P 15,473 $2.53 $39,147 2,901,996 Indirect +0.54% Acquired 59.8% (price as of 2026-08-20)
Sept. 15, 2020 FTK P 7,728 $2.53 $19,552 1,449,414 Indirect +0.54% Acquired 59.8% (price as of 2026-08-20)
Sept. 14, 2020 FTK P 1,287 $2.51 $3,230 133,714 Indirect +0.97% Acquired 61.0% (price as of 2026-08-20)
Sept. 14, 2020 FTK P 27,777 $2.51 $69,720 2,886,523 Indirect +0.97% Acquired 61.0% (price as of 2026-08-20)
Sept. 14, 2020 FTK P 13,873 $2.51 $34,821 1,441,686 Indirect +0.97% Acquired 61.0% (price as of 2026-08-20)
Sept. 11, 2020 FTK P 1,452 $2.44 $3,543 132,427 Indirect +1.11% Acquired 65.6% (price as of 2026-08-20)
Sept. 11, 2020 FTK P 31,352 $2.44 $76,499 2,858,746 Indirect +1.11% Acquired 65.6% (price as of 2026-08-20)
Sept. 11, 2020 FTK P 15,659 $2.44 $38,208 1,427,813 Indirect +1.11% Acquired 65.6% (price as of 2026-08-20)
Sept. 10, 2020 FTK P 366 $2.48 $908 130,975 Indirect +0.28% Acquired 63.0% (price as of 2026-08-20)
Sept. 10, 2020 FTK P 7,893 $2.48 $19,575 2,827,394 Indirect +0.28% Acquired 63.0% (price as of 2026-08-20)
Sept. 10, 2020 FTK P 3,941 $2.48 $9,774 1,412,154 Indirect +0.28% Acquired 63.0% (price as of 2026-08-20)
Sept. 9, 2020 FTK P 1,360 $2.43 $3,305 130,609 Indirect +1.05% Acquired 66.3% (price as of 2026-08-20)
Sept. 9, 2020 FTK P 29,370 $2.43 $71,369 2,819,501 Indirect +1.05% Acquired 66.3% (price as of 2026-08-20)
Sept. 9, 2020 FTK P 14,670 $2.43 $35,648 1,408,213 Indirect +1.05% Acquired 66.3% (price as of 2026-08-20)
Sept. 8, 2020 FTK P 352 $2.40 $845 129,249 Indirect +0.27% Acquired 68.4% (price as of 2026-08-20)
Sept. 8, 2020 FTK P 7,596 $2.40 $18,230 2,790,131 Indirect +0.27% Acquired 68.4% (price as of 2026-08-20)
Sept. 8, 2020 FTK P 3,795 $2.40 $9,108 1,393,543 Indirect +0.27% Acquired 68.4% (price as of 2026-08-20)
Sept. 3, 2020 FTK P 473 $2.39 $1,130 128,897 Indirect +0.37% Acquired 69.1% (price as of 2026-08-20)
Sept. 3, 2020 FTK P 10,202 $2.39 $24,383 2,782,535 Indirect +0.37% Acquired 69.1% (price as of 2026-08-20)
Sept. 3, 2020 FTK P 5,095 $2.39 $12,177 1,389,748 Indirect +0.37% Acquired 69.1% (price as of 2026-08-20)
Sept. 2, 2020 FTK P 4,352 $2.40 $10,445 128,424 Indirect +3.51% Acquired 68.4% (price as of 2026-08-20)
Sept. 2, 2020 FTK P 93,966 $2.40 $225,518 2,772,333 Indirect +3.51% Acquired 68.4% (price as of 2026-08-20)
Sept. 2, 2020 FTK P 46,932 $2.40 $112,637 1,384,653 Indirect +3.51% Acquired 68.4% (price as of 2026-08-20)
Sept. 1, 2020 FTK P 72 $2.30 $166 124,072 Indirect +0.06% Acquired 75.7% (price as of 2026-08-20)
Sept. 1, 2020 FTK P 1,553 $2.30 $3,572 2,678,367 Indirect +0.06% Acquired 75.7% (price as of 2026-08-20)
Sept. 1, 2020 FTK P 775 $2.30 $1,782 1,337,721 Indirect +0.06% Acquired 75.7% (price as of 2026-08-20)
Aug. 24, 2020 FTK P 9,524 $2.11 $20,096 124,000 Indirect +8.32% Acquired 91.5% (price as of 2026-08-20)
Aug. 24, 2020 FTK P 205,587 $2.11 $433,789 2,676,814 Indirect +8.32% Acquired 91.5% (price as of 2026-08-20)
Aug. 24, 2020 FTK P 102,681 $2.11 $216,657 1,336,946 Indirect +8.32% Acquired 91.5% (price as of 2026-08-20)
Aug. 21, 2020 FTK P 5,615 $1.95 $10,949 114,476 Indirect +5.16% Acquired 107.3% (price as of 2026-08-20)
Aug. 21, 2020 FTK P 121,204 $1.95 $236,348 2,471,227 Indirect +5.16% Acquired 107.3% (price as of 2026-08-20)
Aug. 21, 2020 FTK P 60,536 $1.95 $118,045 1,234,265 Indirect +5.16% Acquired 107.3% (price as of 2026-08-20)
Aug. 20, 2020 FTK P 4,106 $1.85 $7,596 108,861 Indirect +3.92% Acquired 118.5% (price as of 2026-08-20)
Aug. 20, 2020 FTK P 127,809 $1.85 $236,447 2,350,023 Indirect +5.75% Acquired 118.5% (price as of 2026-08-20)
Aug. 20, 2020 FTK P 53,085 $1.85 $98,207 1,173,729 Indirect +4.74% Acquired 118.5% (price as of 2026-08-20)
March 16, 2020 RVSB P 13,865 $4.90 $67,938 130,869 Direct +11.85% Acquired 3.9% (price as of 2026-08-20)
March 13, 2020 RVSB P 16,135 $5.05 $81,482 117,004 Direct +16.00% Acquired 0.8% (price as of 2026-08-20)
March 13, 2020 FTK P 151,601 $1.01 $153,117 2,222,214 Indirect +7.32% Acquired 300.2% (price as of 2026-08-20)
March 13, 2020 FTK P 7,146 $1.01 $7,217 104,755 Indirect +7.32% Acquired 300.2% (price as of 2026-08-20)
March 13, 2020 FTK P 76,451 $1.01 $77,216 1,120,644 Indirect +7.32% Acquired 300.2% (price as of 2026-08-20)
March 12, 2020 FTK P 151,600 $0.90 $136,440 2,070,613 Indirect +7.90% Acquired 349.1% (price as of 2026-08-20)
March 12, 2020 FTK P 7,146 $0.90 $6,431 97,609 Indirect +7.90% Acquired 349.1% (price as of 2026-08-20)
March 12, 2020 FTK P 76,451 $0.90 $68,806 1,044,193 Indirect +7.90% Acquired 349.1% (price as of 2026-08-20)
March 11, 2020 FTK P 363,618 $0.99 $359,982 1,919,013 Indirect +23.38% Acquired 308.3% (price as of 2026-08-20)
March 11, 2020 FTK P 18,918 $0.99 $18,729 90,463 Indirect +26.44% Acquired 308.3% (price as of 2026-08-20)
March 11, 2020 FTK P 147,069 $0.99 $145,598 967,742 Indirect +17.92% Acquired 308.3% (price as of 2026-08-20)
Sept. 16, 2019 FTK P 266 $2.54 $676 71,545 Indirect +0.37% Acquired 59.1% (price as of 2026-08-20)
Sept. 16, 2019 FTK P 12,227 $2.54 $31,057 1,555,395 Indirect +0.79% Acquired 59.1% (price as of 2026-08-20)
Sept. 16, 2019 FTK P 4,207 $2.54 $10,686 820,673 Indirect +0.52% Acquired 59.1% (price as of 2026-08-20)
Sept. 13, 2019 FTK P 3,305 $2.50 $8,262 71,279 Indirect +4.86% Acquired 61.7% (price as of 2026-08-20)
Sept. 13, 2019 FTK P 53,667 $2.50 $134,168 1,543,168 Indirect +3.60% Acquired 61.7% (price as of 2026-08-20)
Sept. 13, 2019 FTK P 39,828 $2.50 $99,570 816,466 Indirect +5.13% Acquired 61.7% (price as of 2026-08-20)
Sept. 12, 2019 FTK P 3,243 $2.45 $7,945 67,974 Indirect +5.01% Acquired 65.0% (price as of 2026-08-20)

Showing latest 100 of 391 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date Ticker Security Underlying Exercise price Expiration Shares A/D
March 21, 2022 FTK Convertible Debt Common Shares $1.09 Feb. 2, 2023 — Disposed
March 21, 2022 FTK Convertible Debt Common Shares $1.09 Feb. 3, 2023 — Disposed
March 21, 2022 FTK Convertible Debt Common Shares $1.09 Feb. 2, 2023 — Disposed
Feb. 2, 2022 FTK Convertible Debt Common Shares (94,773) $0.87 Feb. 2, 2023 94,773 Acquired
Feb. 2, 2022 FTK Convertible Debt Common Shares (2,072,946) $0.87 Feb. 3, 2023 2,072,947 Acquired
Feb. 2, 2022 FTK Convertible Debt Common Shares (1,278,576) $0.87 Feb. 2, 2023 1,278,576 Acquired
Oct. 15, 2020 1040899 Stock Option (right to buy) Common Stock (7,278) $17.11 June 11, 2030 7,278 Disposed
Oct. 15, 2020 1040899 Stock Option (right to buy) Common Stock (5,076) $25.66 May 20, 2029 5,076 Disposed
Oct. 15, 2020 1040899 Stock Option (right to buy) Common Stock (16,200) $16.12 June 18, 2028 16,200 Disposed
Oct. 15, 2020 1040899 Stock Option (right to buy) Common Stock (9,766) $11.42 May 19, 2027 9,766 Disposed
Oct. 15, 2020 1040899 Stock Option (right to buy) Common Stock (14,451) $7.70 May 19, 2026 14,451 Disposed
Oct. 15, 2020 1040899 Stock Option (right to buy) Common Stock (18,323) $8.50 June 12, 2025 18,323 Disposed
Oct. 15, 2020 1040899 Stock Option (right to buy) Common Stock (1,771) $7.95 April 15, 2025 1,771 Disposed
Oct. 15, 2020 1040899 Restricted Stock Unit Common Stock (45,287) — — 45,287 Disposed
June 11, 2020 1040899 Stock Option (right to buy) Common Stock (7,278) $17.11 June 11, 2030 7,278 Acquired
June 11, 2020 1040899 Restricted Stock Unit Common Stock (6,428) — — 6,428 Acquired
May 20, 2019 1040899 Stock Option (right to buy) Common Stock (5,076) $25.66 May 20, 2029 5,076 Acquired
May 20, 2019 1040899 Restricted Stock Unit Common Stock (4,288) — — 4,288 Acquired
June 18, 2018 1040899 Restricted Stock Unit Common Stock (3,102) — — 3,102 Acquired
June 18, 2018 1040899 Stock Option (right to buy) Common Stock (16,200) — June 18, 2028 16,200 Acquired
May 19, 2017 1040899 Restricted Stock Unit Common Stock (9,632) — — 9,632 Acquired
May 19, 2017 1040899 Stock Option (right to buy) Common Stock (9,766) — May 19, 2027 9,766 Acquired
May 19, 2016 1040899 Restricted Stock Unit Common Stock (14,286) — — 14,286 Acquired
May 19, 2016 1040899 Stock Option (right to buy) Common Stock (14,451) — May 19, 2026 14,451 Acquired
June 12, 2015 1040899 Restricted Stock Unit Common Stock (6,471) — — 6,471 Acquired
June 12, 2015 1040899 Stock Option (right to buy) Common Stock (18,323) — June 11, 2025 18,323 Acquired
April 15, 2015 1040899 Restricted Stock Unit Common Stock (1,080) $0.00 April 14, 2024 1,080 Acquired
April 15, 2015 1040899 Stock Option Common Stock (1,771) — April 14, 2024 1,771 Acquired
Dec. 13, 2005 1040899 Director Grant Common Stock (7,500) $8.18 — 7,500 Disposed
Dec. 12, 2005 1040899 Director Grant Common Stock (3,300) $9.96 — 3,300 Disposed
Dec. 12, 2005 1040899 Director Grant Common Stock (3,300) $9.00 — 3,300 Disposed
Dec. 12, 2005 1040899 Director Grant Common Stock (3,300) $9.96 — 3,300 Acquired
Dec. 12, 2005 1040899 Director Grant Common Stock (3,300) $9.00 — 3,300 Acquired
Dec. 12, 2005 1040899 Director Grant Common Stock (7,500) $8.18 — 7,500 Acquired
Aug. 10, 2005 1040899 Directors Grant Common Stock (3,300) $9.96 Aug. 10, 2015 3,300 Acquired
Aug. 10, 2005 1040899 Directors Grant Common Stock (3,300) $9.96 Aug. 10, 2015 3,300 Acquired
April 4, 2005 1040899 Restricted Stock Units Common Stock (3,300) $9.00 April 4, 2015 3,300 Acquired
June 15, 2004 1040899 Non Qualified Stock Option (right to buy) Common Stock $4.15 — 10,000 Disposed
June 15, 2004 1040899 Non Qualified Stock Option (right to buy) Common Stock $4.65 July 18, 2013 8,333 Disposed
April 30, 2004 1040899 Option (right to purchase) Common Stock (7,500) $8.54 April 30, 2014 7,500 Acquired
July 18, 2003 1040899 Non-Qualified Stock Option (right to buy) Common Stock (10,000) $4.65 July 18, 2013 0 Acquired
July 18, 2003 1040899 Non-Qualified Stock Option (right to buy) Common Stock (10,000) $4.65 July 18, 2013 10,000 Acquired
Dec. 5, 2002 1040899 Option (right to acquire) Common stock (1,600) $2.70 Dec. 5, 2011 1,600 Acquired
Nov. 22, 2002 1040899 Option (right to acquire) Common Stock (7,500) $11.28 Nov. 22, 2012 7,500 Acquired
Nov. 22, 2002 1040899 Option (right to acquire) Common Stock (7,500) $11.28 Nov. 22, 2012 7,500 Acquired
June 14, 2002 1040899 Non-Qualified Stock Option (right to buy) Common Stock (10,000) $4.15 June 14, 2012 0 Acquired
June 14, 2002 1040899 Non-Qualified Stock Option (right to buy) Common Stock (10,000) $4.15 June 14, 2012 10,000 Acquired
May 28, 2002 1040899 Option (right to acquire) Common stock (1,500) $4.02 May 28, 2012 1,500 Acquired
Feb. 25, 2002 1040899 Option (right to acquire) Common stock (1,600) $3.47 Feb. 25, 2012 1,600 Acquired
Oct. 24, 2001 1040899 Option (right to acquire) Common stock (1,500) $2.63 Oct. 24, 2011 1,500 Acquired
Oct. 18, 2001 1040899 Option (right to acquire) Common Stock (10,000) $6.78 Oct. 18, 2011 10,000 Acquired
Oct. 18, 2001 1040899 Option (right to acquire) Common Stock (10,000) $6.78 Oct. 18, 2011 10,000 Acquired
Aug. 22, 2001 1040899 Option (right to acquire) Common stock (1,600) $3.50 Aug. 22, 2010 1,600 Acquired
July 30, 2001 1040899 Option (right to acquire) Common stock (1,500) $3.00 July 30, 2011 1,500 Acquired
June 15, 2001 1040899 Non-Qualified Stock Option (right to buy) Common Stock (30,000) $11.00 June 15, 2011 0 Acquired
June 15, 2001 1040899 Non-Qualified Stock Option (right to buy) Common Stock (30,000) $11.00 June 15, 2011 30,000 Acquired
May 17, 2001 1040899 Option (right to acquire) Common stock (1,700) $2.75 May 17, 2011 1,700 Acquired
Nov. 14, 2000 1040899 Option (right to acquire) Common stock (1,500) $2.50 Nov. 14, 2010 1,500 Acquired
May 23, 2000 1040899 Option (right to acquire) Common stock (2,000) $3.00 May 23, 2010 2,000 Acquired
Feb. 28, 2000 1040899 Option (right to acquire) Common stock (1,500) $3.50 Feb. 28, 2010 1,500 Acquired
Feb. 12, 2000 1040899 Option (right to acquire) Common stock (1,500) $2.77 Feb. 12, 2011 1,500 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).

Initial ownership (Form 3) 4 holdings

Securities held when first becoming an insider, per SEC Form 3.

Date Ticker Security Shares Ownership
June 5, 2018 FTK Common Stock 448,128 Indirect
June 5, 2018 FTK Common Stock 1,096,190 Indirect
June 5, 2018 FTK Common Stock 81,272 Indirect
May 3, 2016 RVSB Common Stock 13,000 Indirect