Ming Yan
CIK 1874041 · View on SEC EDGAR ↗
Insider
First SEC filing: July 22, 2021 · Latest: June 16, 2026
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 41 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
41 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Dec. 19, 2023 | CTKB | S 10b5-1 | 20,000 | $9.43 | $188,600 | 6,042,103 Direct | -0.33% | Disposed | -48.5% (price as of 2026-08-19) |
| Nov. 20, 2023 | CTKB | S 10b5-1 | 20,000 | $6.03 | $120,600 | 7,762,103 Direct | -0.26% | Disposed | -19.5% (price as of 2026-08-19) |
| Oct. 19, 2023 | CTKB | S 10b5-1 | 20,000 | $4.80 | $96,000 | 7,775,962 Direct | -0.26% | Disposed | 1.1% (price as of 2026-08-19) |
| Sept. 19, 2023 | CTKB | S 10b5-1 | 20,000 | $6.49 | $129,800 | 7,795,962 Direct | -0.26% | Disposed | -25.2% (price as of 2026-08-19) |
| Aug. 21, 2023 | CTKB | S 10b5-1 | 20,000 | $8.07 | $161,400 | 7,815,962 Direct | -0.26% | Disposed | -39.8% (price as of 2026-08-19) |
| July 19, 2023 | CTKB | S 10b5-1 | 20,000 | $8.76 | $175,200 | 7,830,258 Direct | -0.25% | Disposed | -44.6% (price as of 2026-08-19) |
| June 20, 2023 | CTKB | S 10b5-1 | 20,000 | $8.18 | $163,600 | 7,850,258 Direct | -0.25% | Disposed | -40.6% (price as of 2026-08-19) |
| May 19, 2023 | CTKB | S 10b5-1 | 20,000 | $7.19 | $143,800 | 7,870,258 Direct | -0.25% | Disposed | -32.5% (price as of 2026-08-19) |
| April 19, 2023 | CTKB | S 10b5-1 | 20,000 | $9.71 | $194,200 | 7,886,053 Direct | -0.25% | Disposed | -50.0% (price as of 2026-08-19) |
| March 20, 2023 | CTKB | S 10b5-1 | 20,000 | $9.29 | $185,800 | 7,906,053 Direct | -0.25% | Disposed | -47.7% (price as of 2026-08-19) |
| Feb. 21, 2023 | CTKB | S 10b5-1 | 20,000 | $10.94 | $218,800 | 7,926,053 Direct | -0.25% | Disposed | -55.6% (price as of 2026-08-19) |
| Feb. 8, 2023 | CTKB | S 10b5-1 | 897 | $13.53 | $12,136 | 7,944,844 Direct | -0.01% | Disposed | -64.1% (price as of 2026-08-19) |
| Feb. 3, 2023 | CTKB | S 10b5-1 | 11 | $13.51 | $149 | 7,945,741 Direct | 0.00% | Disposed | -64.1% (price as of 2026-08-19) |
| Feb. 3, 2023 | CTKB | S 10b5-1 | 1,081 | $13.50 | $14,594 | 7,945,752 Direct | -0.01% | Disposed | -64.0% (price as of 2026-08-19) |
| Jan. 19, 2023 | CTKB | S 10b5-1 | 20,000 | $11.03 | $220,600 | 7,946,833 Direct | -0.25% | Disposed | -56.0% (price as of 2026-08-19) |
| Dec. 19, 2022 | CTKB | S 10b5-1 | 20,000 | $10.38 | $207,600 | 7,966,833 Direct | -0.25% | Disposed | -53.2% (price as of 2026-08-19) |
| Nov. 21, 2022 | CTKB | S 10b5-1 | 20,000 | $14.66 | $293,200 | 7,986,833 Direct | -0.25% | Disposed | -66.9% (price as of 2026-08-19) |
| Oct. 19, 2022 | CTKB | S 10b5-1 | 20,000 | $14.42 | $288,400 | 8,005,624 Direct | -0.25% | Disposed | -66.3% (price as of 2026-08-19) |
| Sept. 19, 2022 | CTKB | S 10b5-1 | 20,000 | $12.42 | $248,400 | 8,025,624 Direct | -0.25% | Disposed | -60.9% (price as of 2026-08-19) |
| Aug. 19, 2022 | CTKB | S 10b5-1 | 20,000 | $13.62 | $272,400 | 8,045,624 Direct | -0.25% | Disposed | -64.4% (price as of 2026-08-19) |
| July 19, 2022 | CTKB | S 10b5-1 | 20,000 | $11.83 | $236,600 | 8,064,415 Direct | -0.25% | Disposed | -59.0% (price as of 2026-08-19) |
| June 21, 2022 | CTKB | S 10b5-1 | 20,000 | $10.06 | $201,200 | 8,084,415 Direct | -0.25% | Disposed | -51.7% (price as of 2026-08-19) |
| May 19, 2022 | CTKB | S 10b5-1 | 20,000 | $9.92 | $198,400 | 8,104,415 Direct | -0.25% | Disposed | -51.1% (price as of 2026-08-19) |
| April 19, 2022 | CTKB | S 10b5-1 | 20,000 | $10.34 | $206,800 | 8,122,803 Direct | -0.25% | Disposed | -53.0% (price as of 2026-08-19) |
| March 21, 2022 | CTKB | S 10b5-1 | 20,000 | $11.64 | $232,800 | 8,142,803 Direct | -0.25% | Disposed | -58.3% (price as of 2026-08-19) |
| Feb. 22, 2022 | CTKB | S 10b5-1 | 20,000 | $13.44 | $268,800 | 8,089,792 Direct | -0.25% | Disposed | -63.9% (price as of 2026-08-19) |
| Feb. 10, 2022 | CTKB | S 10b5-1 | 5,294 | $15.37 | $81,369 | 8,109,792 Direct | -0.07% | Disposed | -68.4% (price as of 2026-08-19) |
| Feb. 10, 2022 | CTKB | S 10b5-1 | 14,706 | $15.01 | $220,737 | 8,115,086 Direct | -0.18% | Disposed | -67.7% (price as of 2026-08-19) |
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. 18, 2023 | CTKB | Restricted Stock Units | Common Stock (7,363) | — | — | 7,363 | Disposed |
| Nov. 18, 2023 | CTKB | Restricted Stock Units | Common Stock (1,981) | — | — | 1,981 | Disposed |
| Aug. 18, 2023 | CTKB | Restricted Stock Units | Common Stock (7,363) | — | — | 7,363 | Disposed |
| Aug. 18, 2023 | CTKB | Restricted Stock Units | Common Stock (1,981) | — | — | 1,981 | Disposed |
| May 18, 2023 | CTKB | Restricted Stock Units | Common Stock (4,908) | — | — | 4,908 | Disposed |
| May 18, 2023 | CTKB | Restricted Stock Units | Common Stock (1,981) | — | — | 1,981 | Disposed |
| March 3, 2023 | CTKB | Restricted Stock Units | Common Stock (117,813) | — | — | 117,813 | Acquired |
| March 3, 2023 | CTKB | Employee Stock Option (Right to Buy) | Common Stock (178,062) | $10.61 | March 3, 2033 | 178,062 | Acquired |
| Feb. 21, 2023 | CTKB | Restricted Stock Units | Common Stock (1,981) | — | — | 1,981 | Disposed |
| Nov. 18, 2022 | CTKB | Restricted Stock Units | Common Stock (1,981) | — | — | 1,981 | Disposed |
| Aug. 18, 2022 | CTKB | Restricted Stock Units | Common Stock (1,981) | — | — | 1,981 | Disposed |
| May 18, 2022 | CTKB | Restricted Stock Units | Common Stock (2,642) | — | — | 2,642 | Disposed |
| March 7, 2022 | CTKB | Stock Option (Right to Buy) | Common Stock (62,456) | $0.25 | June 28, 2027 | 62,456 | Disposed |
| March 7, 2022 | CTKB | Stock Option (Right to Buy) | Common Stock (10,555) | $0.92 | July 24, 2030 | 10,555 | Disposed |
| Feb. 28, 2022 | CTKB | Restricted Stock Units | Common Stock (31,708) | — | — | 31,708 | Acquired |
| Feb. 28, 2022 | CTKB | Stock Option (Right to Buy) | Common Stock (47,841) | $13.64 | Feb. 28, 2032 | 47,841 | Acquired |
| July 22, 2021 | CTKB | Stock Option (Right to Buy) | Common Stock (125,000) | $17.00 | July 22, 2031 | 125,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 3 holdings
Securities held when first becoming an insider, per SEC Form 3.
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
CTKB
CTO| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $425,000 | — | $425,000 | $425,000 | $166,550 | — | $15,870 | $1,457,420 |
| 2024 | $424,959 | — | $624,995 | $624,996 | $167,646 | — | $13,954 | $1,856,550 |
| 2023 | $424,000 | — | — | $1,250,000 | $114,210 | — | $31,912 | $3,070,122 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.