Mark Slezak is Director & 10% at NANOSPHERE INC (NSPH). They have made 23 open-market trades across 1 company since 2008, most recently 2013-02-08.
CIK 0001165644
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.
23 open-market purchases totalling $11.0M since 2008, never a sale. Across 23 scored buys the stock is down 0.1% at ninety days, and 0.4 points behind the S&P over the same stretch.
23 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| NSPH | 5,006,136 | $8.5M |
Shares reported on the most recent Form 4, priced at the 2012-07-23 close.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 100% | 0% | 0% |
| Avg Move | +5.6% | -0.1% | -0.1% |
| Alpha | +11.4% | -0.4% | -0.4% |
| Scored | 23 | 23 | 23 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| NSPH | BUY | 2012-07-19 | 2012-07-23 | $2.40 | $2.4M | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2012-06-14 | 2012-06-18 | $2.03 | $628K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2012-06-12 | 2012-06-14 | $1.96 | $98K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2012-06-08 | 2012-06-12 | $1.96 | $49K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2012-06-06 | 2012-06-08 | $1.87 | $53K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2012-06-04 | 2012-06-06 | $1.75 | $599K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2012-05-31 | 2012-06-04 | $1.70 | $203K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2012-05-29 | 2012-05-31 | $1.69 | $17K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2012-05-24 | 2012-05-29 | $1.71 | $69K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2011-10-14 | 2011-10-18 | $1.10 | $314K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2011-07-07 | 2011-07-11 | $1.86 | $214K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2011-06-28 | 2011-06-30 | $1.70 | $170K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2011-06-24 | 2011-06-28 | $1.61 | $458K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2011-05-10 | 2011-05-12 | $2.20 | $3.0M | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2009-05-22 | 2009-05-27 | $3.05 | $1.5M | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2009-03-16 | 2009-03-18 | $4.98 | $437K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2009-03-12 | 2009-03-16 | $4.55 | $72K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2009-03-10 | 2009-03-12 | $3.69 | $133K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2009-03-06 | 2009-03-10 | $2.97 | $75K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2008-12-11 | 2008-12-15 | $4.57 | $266K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2008-12-09 | 2008-12-11 | $4.17 | $43K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2008-12-04 | 2008-12-08 | $3.61 | $108K | +5.6% | -0.1% | -0.1% |
| NSPH | BUY | 2008-12-02 | 2008-12-04 | $3.50 | $47K | +5.6% | -0.1% | -0.1% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.