Mark Elliott Boulding is CLO & VP at PTC THERAPEUTICS, INC. (PTCT). They have made 25 open-market trades across 1 company since 2014, most recently 2026-10-09.
CIK 0001578852
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.
0 open-market purchases, against 25 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| PTCT | 105,272 | $6.2M |
Shares reported on the most recent Form 4, priced at the 2026-10-13 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| PTCT | SELL · 10b5-1 | 2026-10-09 | 2026-10-13 | $64.26 | $12K | — | — | — |
| PTCT | SELL · 10b5-1 | 2026-10-05 | 2026-10-07 | $64.06 | $133K | — | — | — |
| PTCT | SELL · 10b5-1 | 2026-08-17 | 2026-08-19 | $72.57 | $204K | -5.5% | -11.1% | — |
| PTCT | SELL · 10b5-1 | 2026-07-06 | 2026-07-08 | $85.08 | $432K | -12.5% | -17.8% | -28.6% |
| PTCT | SELL · 10b5-1 | 2026-06-17 | 2026-06-22 | $78.65 | $823K | +3.2% | -2.9% | -19.2% |
| PTCT | SELL · 10b5-1 | 2026-05-15 | 2026-05-19 | $72.18 | $203K | +3.9% | +11.2% | +2.8% |
| PTCT | SELL · 10b5-1 | 2026-05-08 | 2026-05-12 | $78.97 | $280K | -6.9% | +1.1% | +1.1% |
| PTCT | SELL · 10b5-1 | 2026-04-06 | 2026-04-08 | $69.45 | $157K | +1.8% | +3.8% | +25.6% |
| PTCT | SELL | 2026-02-19 | 2026-02-23 | $69.48 | $210K | -10.2% | -5.3% | -4.0% |
| PTCT | SELL | 2026-02-17 | 2026-02-19 | $69.33 | $409K | -5.9% | -3.0% | +3.8% |
| PTCT | SELL | 2026-01-08 | 2026-01-12 | $77.06 | $489K | -1.9% | -7.6% | -8.2% |
| PTCT | SELL | 2026-01-06 | 2026-01-08 | $77.31 | $512K | -2.9% | -4.7% | -8.4% |
| PTCT | SELL | 2026-01-05 | 2026-01-06 | $75.55 | $171K | -6.1% | -6.2% | -10.7% |
| PTCT | SELL · 10b5-1 | 2025-11-17 | 2025-11-19 | $75.95 | $413K | +2.0% | +2.1% | -10.1% |
| PTCT | SELL · 10b5-1 | 2025-10-07 | 2025-10-09 | $63.36 | $408K | +1.6% | +9.7% | +16.9% |
| PTCT | SELL · 10b5-1 | 2025-10-03 | 2025-10-07 | $65.66 | $2.7M | +2.1% | +12.4% | +18.8% |
| PTCT | SELL · 10b5-1 | 2025-09-11 | 2025-09-15 | $61.23 | $4.4M | -1.8% | +16.3% | +29.5% |
| PTCT | SELL · 10b5-1 | 2025-08-15 | 2025-08-19 | $48.58 | $273K | -0.1% | +27.3% | +53.1% |
| PTCT | SELL | 2025-05-15 | 2025-05-19 | $46.15 | $219K | +3.7% | +7.8% | +6.4% |
| PTCT | SELL · 10b5-1 | 2025-03-12 | 2025-03-14 | $53.30 | $1.7M | +2.1% | -16.8% | -5.9% |
| PTCT | SELL · 10b5-1 | 2025-03-10 | 2025-03-12 | $53.08 | $8.0M | +7.8% | -18.7% | -2.2% |
| PTCT | SELL | 2025-02-19 | 2025-02-21 | $50.11 | $295K | +2.9% | +13.0% | -9.8% |
| PTCT | SELL | 2025-01-07 | 2025-01-10 | $45.01 | $229K | +6.2% | +14.5% | -7.4% |
| PTCT | SELL · 10b5-1 | 2024-12-02 | 2024-12-04 | $52.36 | $9.9M | +0.2% | -4.1% | +6.7% |
| PTCT | SELL | 2024-01-30 | 2024-02-01 | $27.25 | $22K | -5.2% | +21.6% | +34.1% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.