Michael S. Weiss is 10% at KERYX BIOPHARMACEUTICALS INC (KERX). They have made 13 open-market trades across 5 companies since 2006, most recently 2026-03-18.
CIK 0001038977
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
9 open-market purchases totalling $6.9M since 2008, against 4 sales. Across 7 scored buys the stock is down 2.7% at ninety days, and 4.5 points behind the S&P over the same stretch.
7 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 43% | 29% | 29% |
| Avg Move | -7.3% | +6.4% | -2.7% |
| Alpha | -4.5% | +5.7% | -4.5% |
| Scored | 7 | 7 | 7 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| FBIO | BUY | 2023-11-14 | 2023-11-16 | $1.70 | $500K | +30.6% | +59.2% | +19.7% |
| TGTX | BUY | 2023-08-11 | 2023-08-14 | $10.13 | $2.0M | -6.5% | -8.6% | -7.5% |
| FBIO | BUY | 2023-02-10 | 2023-02-14 | $0.84 | $2.0M | +10.3% | +8.8% | +4.0% |
| TGTX | SELL | 2022-01-04 | 2022-01-07 | $18.80 | $2.6M | -18.3% | -40.4% | -43.3% |
| TGTX | BUY | 2019-06-26 | 2019-06-27 | $7.04 | $352K | +2.9% | -6.6% | -27.7% |
| TGTX | SELL | 2014-12-16 | 2014-12-18 | $16.44 | $3.5M | -28.0% | -3.0% | -3.0% |
| CNDO | BUY | 2014-11-06 | 2014-11-10 | $1.61 | $1.6M | N/A | N/A | N/A |
| TGTX | BUY | 2013-12-11 | 2013-12-12 | $3.43 | $34K | -28.0% | -3.0% | -3.0% |
| TGTX | BUY | 2012-09-10 | 2012-09-11 | $2.25 | $338K | -28.0% | -3.0% | -3.0% |
| TGTXD | BUY | 2012-05-16 | 2012-05-17 | $6.25 | $9K | N/A | N/A | N/A |
| KERX | SELL | 2010-04-23 | 2010-05-12 | $5.40 | $3.4M | -32.6% | -1.8% | -1.8% |
| KERX | SELL | 2010-04-05 | 2010-04-13 | $3.81 | $1.8M | -32.6% | -1.8% | -1.8% |
| KERX | BUY | 2008-08-22 | 2008-08-26 | $0.40 | $61K | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-12-15 | 2006-12-18 | $14.03 | $524K | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-12-12 | 2006-12-14 | $14.31 | $848K | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-12-11 | 2006-12-11 | $14.47 | $268K | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-12-07 | 2006-12-11 | $14.59 | $1.2M | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-07-18 | 2006-07-19 | $11.61 | $116K | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-06-20 | 2006-06-22 | $12.61 | $505K | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-05-16 | 2006-05-18 | $15.31 | $582K | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-04-18 | 2006-04-20 | $17.09 | $624K | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-03-21 | 2006-03-23 | $18.28 | $1.5M | -32.6% | -1.8% | -1.8% |
| KERX | SELL · 10b5-1 | 2006-02-21 | 2006-02-23 | $16.65 | $666K | -32.6% | -1.8% | -1.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| CNDO |
| 6,938,038 |
| — |
| [CNDO] | 5,938,038 | — |
| Total | $537.8M |
Shares reported on the most recent Form 4, priced at the 2026-03-20 close. 3 holdings could not be priced and are excluded from the total.