David Sidransky
Insider
First SEC filing: June 16, 2008 · Latest: March 23, 2026
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net: $0
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Nov. 5, 2025 | CSBR | A | 21,216 | $6.80 | $144,269 | 21,216 Direct | · | Acquired | -27.4% (price as of 2026-10-02) |
| Nov. 12, 2024 | CSBR | A | 21,880 | $4.64 | $101,523 | 21,880 Direct | · | Acquired | 6.5% (price as of 2026-10-02) |
| Nov. 3, 2023 | CSBR | A | 15,495 | $5.51 | $85,377 | 15,495 Direct | · | Acquired | -10.3% (price as of 2026-10-02) |
| Nov. 1, 2022 | CSBR | A | 11,480 | $7.00 | $80,360 | 11,480 Direct | · | Acquired | -29.4% (price as of 2026-10-02) |
| Oct. 12, 2022 | CSBR | M | 8,333 | $3.21 | $26,749 | 770,605 Direct | +1.09% | Acquired | 53.9% (price as of 2026-10-02) |
| Oct. 12, 2022 | CSBR | F | 3,562 | $7.51 | $26,751 | 767,043 Direct | -0.46% | Disposed | -34.2% (price as of 2026-10-02) |
| Oct. 12, 2022 | CSBR | M | 8,333 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Nov. 5, 2021 | CSBR | A | 8,045 | $10.10 | $81,254 | 8,045 Direct | · | Acquired | -51.1% (price as of 2026-10-02) |
| Oct. 15, 2021 | CSBR | M | 16,667 | $1.59 | $26,501 | 764,901 Direct | +2.23% | Acquired | 210.7% (price as of 2026-10-02) |
| Oct. 15, 2021 | CSBR | F | 2,629 | $10.08 | $26,500 | 762,272 Direct | +0.35% | Acquired | -51.0% (price as of 2026-10-02) |
| Oct. 15, 2021 | CSBR | A | 16,667 | · | · | 0 Direct | · | Acquired | (price as of 2026-10-02) |
| Dec. 8, 2020 | CSBR | A | 8,333 | $11.96 | $99,663 | 8,333 Direct | · | Acquired | -58.7% (price as of 2026-10-02) |
| Oct. 16, 2020 | CSBR | M | 16,667 | $5.46 | $91,002 | 758,334 Direct | +2.25% | Acquired | -9.5% (price as of 2026-10-02) |
| Oct. 16, 2020 | CSBR | F | 10,100 | $9.01 | $91,001 | 748,234 Direct | -1.33% | Disposed | -45.2% (price as of 2026-10-02) |
| Oct. 16, 2020 | CSBR | M | 16,667 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-02) |
| Nov. 4, 2019 | CSBR | A | 8,333 | $5.43 | $45,248 | 8,333 Direct | · | Acquired | -9.0% (price as of 2026-10-02) |
| Nov. 1, 2018 | CSBR | A | 8,333 | $12.73 | $106,079 | 8,333 Direct | · | Acquired | -61.2% (price as of 2026-10-02) |
| Nov. 1, 2016 | CSBR | A | 16,667 | · | · | 16,667 Direct | · | Acquired | (price as of 2026-10-02) |
| Nov. 2, 2015 | CSBR | A | 16,667 | · | · | 16,667 Direct | · | Acquired | (price as of 2026-10-02) |
| Oct. 13, 2014 | CSBR | A | 200,000 | · | · | 200,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Dec. 12, 2013 | CSBR | A | 200,000 | · | · | 200,000 Direct | · | Acquired | (price as of 2026-10-02) |
| July 14, 2011 | CSBR | A | 100,000 | · | · | 100,000 Direct | · | Acquired | (price as of 2026-10-02) |
| July 14, 2011 | CSBR | A | 100,000 | · | · | 10,675,000 Direct | +0.95% | Acquired | (price as of 2026-10-02) |
| Feb. 22, 2010 | CSBR | A | 200,000 | · | · | 200,000 Direct | · | Acquired | (price as of 2026-10-02) |
| Aug. 28, 2009 | CSBR | A | 80,000 | · | · | 80,000 Direct | · | Acquired | (price as of 2026-10-02) |
| March 31, 2008 | CSBR | A | 40,000 | · | · | 40,000 Direct | · | Acquired | (price as of 2026-10-02) |
| May 17, 2007 | CSBR | J | 3,800,000 | · | · | 10,800,000 Direct | +54.29% | Acquired | (price as of 2026-10-02) |
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 |
|---|---|---|---|---|---|---|---|
| Nov. 5, 2025 | CSBR | Option to purchase Common Stock | Common Stock | $6.80 | Nov. 5, 2035 | 21,216 | Acquired |
| Nov. 12, 2024 | CSBR | Option to purchase Common Stock | Common Stock | $4.64 | Nov. 12, 2034 | 21,880 | Acquired |
| Nov. 3, 2023 | CSBR | Option to purchase Common Stock | Common Stock | $5.51 | Nov. 3, 2033 | 15,495 | Acquired |
| Nov. 1, 2022 | CSBR | Option to purchase Common Stock | Common Stock | $7.00 | Nov. 1, 2032 | 11,480 | Acquired |
| Oct. 12, 2022 | CSBR | Option to purchase Common Stock | Common Stock | $3.21 | Oct. 31, 2022 | 8,333 | Disposed |
| Nov. 5, 2021 | CSBR | Option to purchase Common Stock | Common Stock | $10.10 | Nov. 5, 2031 | 8,045 | Acquired |
| Oct. 15, 2021 | CSBR | Option to purchase Common Stock | Common Stock | $1.59 | Nov. 1, 2021 | 16,667 | Acquired |
| Dec. 8, 2020 | CSBR | Option to purchase Common Stock | Common Stock | $11.96 | Dec. 8, 2025 | 8,333 | Acquired |
| Oct. 16, 2020 | CSBR | Option to purchase Common Stock | Common Stock | $5.46 | Nov. 2, 2020 | 16,667 | Disposed |
| Nov. 4, 2019 | CSBR | Option to purchase Common Stock | Common Stock | $5.43 | Nov. 3, 2024 | 8,333 | Acquired |
| Nov. 1, 2018 | CSBR | Option to purchase Common Stock | Common Stock | $12.73 | Nov. 1, 2023 | 8,333 | Acquired |
| Nov. 1, 2016 | CSBR | Stock Options | Common Stock | $1.59 | Oct. 31, 2021 | 16,667 | Acquired |
| Nov. 2, 2015 | CSBR | Stock Options | Common Stock | $5.46 | Nov. 2, 2020 | 16,667 | Acquired |
| Oct. 13, 2014 | CSBR | Stock Options | Common Stock | $0.60 | Oct. 13, 2019 | 200,000 | Acquired |
| Dec. 12, 2013 | CSBR | Stock Options | Common Stock | $1.26 | Dec. 12, 2018 | 200,000 | Acquired |
| July 14, 2011 | CSBR | Common Stock Purchase Options | Common Stock | $0.90 | July 13, 2016 | 100,000 | Acquired |
| Feb. 22, 2010 | CSBR | Common Stock Purchase Option | Common Stock | $0.77 | Feb. 21, 2015 | 200,000 | Acquired |
| Aug. 28, 2009 | CSBR | Right to Purchase | Common Stock | $0.77 | Aug. 27, 2019 | 80,000 | Acquired |
| March 31, 2008 | CSBR | Director Stock Options | Common Stock | $1.15 | March 31, 2013 | 40,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 21 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| March 23, 2026 | AAPG | Ordinary Shares [F1] | 10,641 | Direct |
| March 23, 2026 | AAPG | Options | · | Direct |
| March 23, 2026 | AAPG | Restricted share units | · | Direct |
| March 19, 2026 | AAPG | Options | 56,550 | Direct |
| March 19, 2026 | AAPG | Restricted stock units | 66,550 | Direct |
| March 18, 2026 | EOCN | Ordinary Shares | 11,083 | Direct |
| March 18, 2026 | EOCN | Restricted Share Units | 1,042 | Direct |
| March 18, 2026 | EOCN | Restricted Share Units | 11,666 | Direct |
| March 18, 2026 | EOCN | Restricted Share Units | 12,500 | Direct |
| March 18, 2026 | EOCN | Options to Purchase Ordinary Shares | 111 | Direct |
| March 18, 2026 | EOCN | Options to Purchase Ordinary Shares | 166 | Direct |
| Jan. 2, 2015 | AKTX | Ordinary Shares | 54,732 | Direct |
| Jan. 2, 2015 | AKTX | Options to Purchase Ordinary Shares | 68,250 | Direct |
| Jan. 2, 2015 | AKTX | Options to Purchase Ordinary Shares | 60,227 | Direct |
| Jan. 2, 2015 | AKTX | Options to Purchase Ordinary Shares | 25,000 | Direct |
| Jan. 2, 2015 | AKTX | Options to Purchase Ordinary Shares | 30,000 | Direct |
| Jan. 2, 2015 | AKTX | Options to Purchase Ordinary Shares | 100,000 | Direct |
| Jan. 2, 2015 | AKTX | Options to Purchase Ordinary Shares | 45,000 | Direct |
| Jan. 2, 2015 | AKTX | Options to Purchase Ordinary Shares | 45,000 | Direct |
| Jan. 2, 2015 | AKTX | Warrants to Purchase Ordinary Shares | 12,500 | Direct |
| Jan. 11, 2007 | CSBR | Common Stock | 7,000,000 | Direct |