PTC Therapeutics
PTCT · NASDAQ
$62.92+$1.39 (+2.26%)TodayMarket closed ·
Prev close $61.53
Who owns PTCT
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 64.2% of PTCT’s shares.
- BlackRock Institutional Trust Company, N.A.14.9%
- RTW Investments L.P.9.3%
- Janus Henderson Investors8.7%
- Vanguard Portfolio Management, LLC5.9%
- Next 6 largest institutions25.3%
- All other shareholders35.8%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 12.36M | 14.90% |
| RTW Investments L.P. | 7.75M | 9.34% |
| Janus Henderson Investors | 7.24M | 8.72% |
| Vanguard Portfolio Management, LLC | 4.93M | 5.94% |
| State Street Investment Management (US) | 4.60M | 5.54% |
| The Toronto-Dominion Bank | 4.14M | 4.99% |
| Wellington Management Company, LLP | 4.13M | 4.98% |
| Vanguard Capital Management, LLC | 3.74M | 4.51% |
| Geode Capital Management, L.L.C. | 2.21M | 2.66% |
| TD Securities, Inc. | 2.17M | 2.61% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| iShares Core S&P Small-Cap ETF | 5.05M | 6.09% |
| Vanguard Total Stock Market Index Fund | 2.64M | 3.19% |
| iShares Russell 2000 ETF | 2.14M | 2.58% |
| Vanguard Health Care Fund | 2.05M | 2.47% |
| Vanguard Small-Cap Index Fund | 1.91M | 2.30% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $24.60M (74 trades) of PTCT on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| SCHMERTZLER MICHAEL | Sale | 382 | $22.97K |
| SCHMERTZLER MICHAEL | Sale | 2.12K | $126.06K |
| Boulding Mark Elliott | Option exercise | 192 | — |
| Boulding Mark Elliott | Sale | 192 | $12.34K |
| Boulding Mark Elliott | Option exercise | 192 | $7.57K |
| SCHMERTZLER MICHAEL | Sale | 53 | $3.39K |
| SCHMERTZLER MICHAEL | Sale | 2.45K | $155.09K |
| Boulding Mark Elliott | Option exercise | 435 | — |
| Boulding Mark Elliott | Sale | 435 | $27.91K |
| Boulding Mark Elliott | Option exercise | 435 | $17.15K |
Short interest
Settled Sep 30, 2026
- Shares short
- 9.17M
- Days to cover
- 6.14
- % of shares outstanding
- 11.05%
- Average daily volume
- 1.49M
- Change since last report
- −5.9%
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