William Mariner Greenman

CIK 1377258 · View on SEC EDGAR ↗

Insider

First SEC filing: Sept. 3, 2010 · Latest: Sept. 3, 2010

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Insider at

Insider transactions

0 buys (P) 3 sells (S) Net: $-1,200,075 + 71 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

71 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
June 30, 2026 CERS S 10b5-1 101,919 $2.94 $299,642 5,053,036 Direct -1.98% Disposed -4.8% (price as of 2026-08-21)
March 12, 2026 CERS S 10b5-1 447,757 $1.66 $743,277 4,998,493 Direct -8.22% Disposed 68.7% (price as of 2026-08-21)
March 6, 2026 CERS S 10b5-1 78,187 $2.01 $157,156 5,446,250 Direct -1.42% Disposed 39.3% (price as of 2026-08-21)
March 14, 2025 CERS S 10b5-1 122,827 $1.45 $178,099 4,115,845 Direct -2.90% Disposed 93.1% (price as of 2026-08-21)
March 13, 2025 CERS S 10b5-1 71,086 $1.45 $103,075 4,238,672 Direct -1.65% Disposed 93.1% (price as of 2026-08-21)
March 7, 2025 CERS S 10b5-1 60,984 $1.50 $91,476 4,309,758 Direct -1.40% Disposed 86.7% (price as of 2026-08-21)
March 4, 2025 CERS S 10b5-1 23,023 $1.55 $35,686 3,230,000 Direct -0.71% Disposed 80.6% (price as of 2026-08-21)
March 14, 2024 CERS S 10b5-1 63,611 $2.02 $128,494 3,181,281 Direct -1.96% Disposed 38.6% (price as of 2026-08-21)
March 13, 2024 CERS S 10b5-1 62,315 $2.06 $128,369 3,244,892 Direct -1.88% Disposed 35.9% (price as of 2026-08-21)
March 13, 2023 CERS S 22,732 $2.80 $63,650 2,658,346 Direct -0.85% Disposed 0.0% (price as of 2026-08-21)
March 13, 2023 CERS S 37,748 $2.80 $105,694 2,616,411 Direct -1.42% Disposed 0.0% (price as of 2026-08-21)
March 14, 2022 CERS S 33,276 $5.04 $167,711 1,967,192 Direct -1.66% Disposed -44.4% (price as of 2026-08-21)
March 14, 2022 CERS S 53,702 $5.04 $270,658 1,935,801 Direct -2.70% Disposed -44.4% (price as of 2026-08-21)
March 14, 2022 CERS S 78,043 $5.04 $393,337 1,885,141 Direct -3.98% Disposed -44.4% (price as of 2026-08-21)
Feb. 25, 2022 CERS S 93,000 $5.73 $532,890 1,594,018 Direct -5.51% Disposed -51.1% (price as of 2026-08-21)
Feb. 25, 2022 CERS S 215,263 $5.69 $1,224,846 1,687,018 Direct -11.32% Disposed -50.8% (price as of 2026-08-21)
March 15, 2021 CERS S 10b5-1 52,484 $6.38 $334,848 1,102,531 Direct -4.54% Disposed -56.1% (price as of 2026-08-21)
March 15, 2021 CERS S 10b5-1 76,272 $6.38 $486,615 1,050,652 Direct -6.77% Disposed -56.1% (price as of 2026-08-21)
March 15, 2021 CERS S 10b5-1 27,651 $6.38 $176,413 975,257 Direct -2.76% Disposed -56.1% (price as of 2026-08-21)
March 17, 2020 CERS S 10b5-1 69,210 $3.59 $248,464 825,849 Direct -7.73% Disposed -22.0% (price as of 2026-08-21)
March 17, 2020 CERS S 10b5-1 27,865 $3.59 $100,035 743,392 Direct -3.61% Disposed -22.0% (price as of 2026-08-21)
March 17, 2020 CERS S 10b5-1 10,936 $3.59 $39,260 699,590 Direct -1.54% Disposed -22.0% (price as of 2026-08-21)
June 4, 2019 CERS P 10,000 $4.60 $46,000 638,485 Direct +1.59% Acquired -39.1% (price as of 2026-08-21)
March 13, 2019 CERS S 10,619 $5.90 $62,652 583,777 Direct -1.79% Disposed -52.5% (price as of 2026-08-21)
March 13, 2019 CERS S 27,059 $5.90 $159,648 628,385 Direct -4.13% Disposed -52.5% (price as of 2026-08-21)
March 13, 2019 CERS S 27,059 $5.90 $159,648 605,885 Direct -4.28% Disposed -52.5% (price as of 2026-08-21)
March 13, 2019 CERS S 10,619 $5.90 $62,652 561,277 Direct -1.86% Disposed -52.5% (price as of 2026-08-21)
March 12, 2019 CERS S 7,781 $6.48 $50,421 566,271 Direct -1.36% Disposed -56.8% (price as of 2026-08-21)
March 12, 2019 CERS S 7,781 $6.48 $50,421 543,771 Direct -1.41% Disposed -56.8% (price as of 2026-08-21)

Showing latest 100 of 158 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 3, 2025 CERS Restricted Stock Unit Common Stock (57,637) — — 57,637 Disposed
Feb. 26, 2025 CERS Restricted Stock Unit Common Stock (57,637) — — 57,637 Acquired
March 12, 2024 CERS Restricted Stock Unit Common Stock (64,666) — — 64,666 Disposed
March 12, 2023 CERS Restricted Stock Unit Common Stock (64,667) — — 64,667 Disposed
March 12, 2023 CERS Restricted Stock Unit Common Stock (107,525) — — 107,525 Disposed
March 12, 2022 CERS Restricted Stock Unit Common Stock (64,667) — — 64,667 Disposed
March 12, 2022 CERS Restricted Stock Unit Common Stock (104,362) — — 104,362 Disposed
March 12, 2022 CERS Restricted Stock Unit Common Stock (151,666) — — 151,666 Disposed
March 1, 2022 CERS Option (Right to Buy) Common Stock (435,000) $5.76 Feb. 28, 2032 435,000 Acquired
Feb. 25, 2022 CERS Option (Right to Buy) Common Stock (380,000) $3.75 Feb. 28, 2022 380,000 Disposed
Aug. 3, 2021 CERS Option (Right to Buy) Common Stock (100,000) $2.08 Aug. 31, 2021 100,000 Disposed
April 16, 2021 CERS Option (Right to Buy) Common Stock (550,000) $2.70 April 18, 2021 550,000 Disposed
March 12, 2021 CERS Restricted Stock Unit Common Stock (104,363) — — 104,363 Disposed
March 12, 2021 CERS Restricted Stock Unit Common Stock (151,667) — — 151,667 Disposed
March 12, 2021 CERS Restricted Stock Unit Common Stock (71,666) — — 71,666 Disposed
March 1, 2021 CERS Restricted Stock Unit Common Stock (194,000) — — 194,000 Acquired
March 1, 2021 CERS Option (Right to Buy) Common Stock (380,000) $6.52 Feb. 28, 2031 380,000 Acquired
Aug. 26, 2020 CERS Option (Right to Buy) Common Stock (100,000) $3.00 Aug. 31, 2020 100,000 Disposed
March 12, 2020 CERS Restricted Stock Unit Common Stock (151,667) — — 151,667 Disposed
March 12, 2020 CERS Restricted Stock Unit Common Stock (71,667) — — 71,667 Disposed
March 12, 2020 CERS Restricted Stock Unit Common Stock (28,125) — — 28,125 Disposed
March 2, 2020 CERS Restricted Stock Unit Common Stock (316,250) — — 316,250 Acquired
March 2, 2020 CERS Option (Right to Buy) Common Stock (632,500) $5.11 March 1, 2030 632,500 Acquired
Sept. 24, 2019 CERS Stock Option (Right to Buy) Common Stock (40,000) $2.15 Sept. 30, 2019 40,000 Disposed
June 6, 2019 CERS Restricted Stock Unit Common Stock (455,000) — — 455,000 Acquired
April 22, 2019 CERS Option (Right to Buy) Common Stock (100) $1.06 April 22, 2019 100 Disposed
March 12, 2019 CERS Restricted Stock Unit Common Stock (71,667) — — 71,667 Disposed
March 12, 2019 CERS Restricted Stock Unit Common Stock (28,125) — — 28,125 Disposed
March 12, 2019 CERS Restricted Stock Unit Common Stock (71,667) — — 71,667 Disposed
March 12, 2019 CERS Restricted Stock Unit Common Stock (28,125) — — 28,125 Disposed
March 10, 2019 CERS Restricted Stock Unit Common Stock (22,500) — — 22,500 Disposed
March 10, 2019 CERS Restricted Stock Unit Common Stock (22,500) — — 22,500 Disposed
Dec. 28, 2018 CERS Option (Right to Buy) Common Stock (150,000) $0.79 Jan. 11, 2019 150,000 Disposed
Sept. 27, 2018 CERS Option (Right to Buy) Common Stock (40,000) $4.19 Sept. 30, 2018 40,000 Disposed
March 12, 2018 CERS Restricted Stock Unit Common Stock (28,125) — — 28,125 Disposed
March 10, 2018 CERS Restricted Stock Unit Common Stock (22,500) — — 22,500 Disposed
March 1, 2018 CERS Restricted Stock Unit Common Stock (215,000) — — 215,000 Acquired
March 1, 2018 CERS Option (Right to Buy) Common Stock (430,000) $4.32 Feb. 28, 2028 430,000 Acquired
March 10, 2017 CERS Restricted Stock Unit Common Stock (22,500) — — 22,500 Disposed
March 1, 2017 CERS Restricted Stock Unit Common Stock (84,375) — — 84,375 Acquired
March 1, 2017 CERS Option (Right to Buy) Common Stock (400,000) $4.33 Feb. 28, 2027 400,000 Acquired
Sept. 30, 2016 CERS Option (Right to Buy) Common Stock (55,000) $5.55 Oct. 1, 2016 55,000 Disposed
March 1, 2016 CERS Restricted Stock Unit Common Stock (67,500) — — 67,500 Acquired
March 1, 2016 CERS Option (Right to Buy) Common Stock (315,000) $5.06 Feb. 28, 2026 315,000 Acquired
March 2, 2015 CERS Option (Right to Buy) Common Stock (500,000) $4.46 March 1, 2025 500,000 Acquired
May 5, 2014 CERS Option (Right to Buy) Common Stock (46,500) $2.28 June 28, 2014 46,500 Disposed
March 26, 2014 CERS Option (Right to Buy) Common Stock (50) $3.52 March 30, 2014 50 Disposed
March 4, 2014 CERS Option (Right to Buy) [F8] Common Stock (53,500) $2.28 June 28, 2014 53,500 Disposed
March 3, 2014 CERS Option (Right to Buy) [F6] Common Stock (325,000) $6.28 March 2, 2024 325,000 Acquired
March 3, 2014 CERS Option (Right to Buy) Common Stock (53,500) $2.28 June 28, 2014 53,500 Disposed
March 3, 2014 CERS Option (Right to Buy) Common Stock (325,000) $6.28 March 2, 2024 325,000 Acquired
Aug. 22, 2013 CERS Options (Right to Buy) Common Stock (17,250) $4.25 Nov. 13, 2013 17,250 Disposed
March 1, 2013 CERS Option (Right to Buy) Common Stock (390,000) $3.66 Feb. 28, 2023 390,000 Acquired
March 1, 2012 CERS Option (Right to Buy) Common Stock (380,000) $3.75 Feb. 28, 2022 380,000 Acquired
Sept. 1, 2011 CERS Option (Right to Buy) Common Stock (100,000) $2.08 Aug. 31, 2021 100,000 Acquired
April 18, 2011 CERS Option (Right to Buy) Common Stock (550,000) $2.72 April 17, 2021 550,000 Acquired
Sept. 1, 2010 CERS Option (Right to Buy) Common Stock (100,000) $3.00 Aug. 31, 2020 100,000 Acquired
Oct. 1, 2009 CERS Option (Right to Buy) Common Stock (40,000) $2.15 Sept. 30, 2009 40,000 Acquired
April 23, 2009 CERS Option (Right to Buy) Common Stock (100) $1.06 April 22, 2019 100 Acquired
Jan. 12, 2009 CERS Option (Right to Buy) Common Stock (150,000) $0.79 Jan. 11, 2019 150,000 Acquired
Oct. 1, 2008 CERS Option (Right to Buy) Common Stock (40,000) $4.19 Sept. 30, 2018 40,000 Acquired
Oct. 1, 2007 CERS Option (Right to Buy) Common Stock (30,000) $8.73 Sept. 30, 2017 30,000 Acquired
Oct. 2, 2006 CERS Option (Right to Buy) Common Stock (55,000) $5.55 Oct. 1, 2016 55,000 Acquired

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

Initial ownership (Form 3) 36 holdings

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

Date Ticker Security Shares Ownership
Sept. 3, 2010 CERS Common Stock 76,026 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (10,000) 10,000 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (12,446) 12,446 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (17,554) 17,554 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (3,343) 3,343 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (21,657) 21,657 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (3,529) 3,529 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (16,471) 16,471 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (2,751) 2,751 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (24,749) 24,749 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (5,751) 5,751 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (5,750) 5,750 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (5,749) 5,749 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (17,250) 17,250 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (50) 50 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (100,000) 100,000 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (65,000) 65,000 Direct
Sept. 3, 2010 CERS Option (Right to Buy)→ Common Stock (75) 75 Direct
Oct. 4, 2006 CERS Common Stock 76,026 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (10,000) 10,000 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (12,446) 12,446 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (17,554) 17,554 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (3,343) 3,343 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (21,657) 21,657 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (3,529) 3,529 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (16,471) 16,471 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (2,751) 2,751 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (24,749) 24,749 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (5,751) 5,751 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (5,750) 5,750 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (5,749) 5,749 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (17,250) 17,250 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (50) 50 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (100,000) 100,000 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (65,000) 65,000 Direct
Oct. 4, 2006 CERS Option (Right to Buy)→ Common Stock (75) 75 Direct

Compensation (DEF 14A)

Matched by name from proxy statements (DEF 14A) — verify against the filing.

CERS

Fiscal year Salary Bonus Stock awards Option awards Non-equity incentive Pension change Other Total
2025 $793,750 — $2,242,585 — $756,000 — $2,322 $3,794,657
2024 $770,000 $110,495 $2,092,800 — — — $2,322 $2,975,617
2023 $763,750 — $2,624,850 — $269,500 — $2,372 $3,660,472

Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.