PTC Therapeutics, Inc.
US ˙ NasdaqGS ˙ US69366J2006

SecurityPTCT / PTC Therapeutics, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership890,715 shares
Latest Disclosed Value $ 60,674,282
Dimensional Fund Advisors Lp reports 42.04% increase in ownership of PTCT / PTC Therapeutics, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 890,715 shares of PTC Therapeutics, Inc. (US:PTCT) valued at $60,684,413 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 627,092 shares of PTC Therapeutics, Inc.. This represents a change in shares of 42.04% during the quarter. The current value of the position is $61,174,306 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F PTC THERAPEUTICS COM 69366J200 890,715 263,623 42.04 60,674 27.38 0.0027
2026-02-12 2025-12-31 13F PTC THERAPEUTICS COM 69366J200 627,092 -146,086 -18.89 47,634 0.39 0.0100
2025-11-12 2025-09-30 13F PTC THERAPEUTICS COM 69366J200 773,178 245,774 46.60 47,448 84.21 0.0102
2025-08-12 2025-06-30 13F PTC THERAPEUTICS COM 69366J200 527,404 -34,435 -6.13 25,758 -10.07 0.0060
2025-05-13 2025-03-31 13F PTC THERAPEUTICS COM 69366J200 561,839 456,789 434.83 28,641 504.11 0.0071
2025-02-13 2024-12-31 13F PTC THERAPEUTICS COM 69366J200 105,050 105,050 4,742 0.0011
2023-11-09 2023-09-30 13F PTC THERAPEUTICS COM 69366J200 0 -15,851 -100.00 0 -100.00
2023-08-09 2023-06-30 13F PTC THERAPEUTICS COM 69366J200 15,851 535 3.49 645 -13.09 0.0002
2023-05-12 2023-03-31 13F PTC THERAPEUTICS COM 69366J200 15,316 255 1.69 742 0.0002
2023-02-09 2022-12-31 13F PTC THERAPEUTICS COM 69366J200 15,061 -532 -3.41 1 -100.00 0.0002
2022-11-10 2022-09-30 13F PTC THERAPEUTICS COM 69366J200 15,593 15,593 783 0.0003
2021-11-12 2021-09-30 13F PTC THERAPEUTICS COM 69366J200 0 -64,228 -100.00 0 -100.00
2021-08-12 2021-06-30 13F PTC THERAPEUTICS COM 69366J200 64,228 -2,581 -3.86 2,714 -14.20 0.0009
2021-05-14 2021-03-31 13F PTC THERAPEUTICS COM 69366J200 66,809 -10,585 -13.68 3,163 -33.04 0.0010
2021-03-08 2020-12-31 13F/A-2 PTC THERAPEUTICS COM 69366J200 77,394 -2,862 -3.57 4,724 25.87 0.0017
2021-02-11 2020-12-31 13F PTC THERAPEUTICS COM 69366J200 77,394 -2,862 4,724 1,706.0577
2020-11-12 2020-09-30 13F PTC THERAPEUTICS COM 69366J200 80,256 3,923 5.14 3,753 -3.10 0.0016
2020-08-13 2020-06-30 13F PTC THERAPEUTICS COM 69366J200 76,333 -12,970 -14.52 3,873 -2.66 0.0017
2020-05-14 2020-03-31 13F PTC THERAPEUTICS COM 69366J200 89,303 54,778 158.66 3,979 140.13 0.0021
2020-02-14 2019-12-31 13F PTC THERAPEUTICS COM 69366J200 34,525 -57,987 -62.68 1,657 -47.04 0.0006
2019-11-12 2019-09-30 13F PTC THERAPEUTICS COM 69366J200 92,512 -87,797 -48.69 3,129 -61.44 0.0012
2019-08-13 2019-06-30 13F PTC THERAPEUTICS COM 69366J200 180,309 -32,617 -15.32 8,114 1.24 0.0032
2019-08-12 2019-03-31 13F/A-2 PTC THERAPEUTICS COM 69366J200 212,926 -30,926 -12.68 8,015 -4.23 0.0032
2019-05-10 2019-03-31 13F PTC THERAPEUTICS COM 69366J200 212,926 -30,926 8,015
2019-02-26 2018-12-31 13F/A-1 PTC THERAPEUTICS COM 69366J200 243,852 28,969 13.48 8,369 -17.14 0.0038
2019-02-13 2018-12-31 13F PTC THERAPEUTICS COM 69366J200 243,852 28,969 8,369
2018-11-13 2018-09-30 13F PTC THERAPEUTICS COM 69366J200 214,883 0 0.00 10,100 39.35 0.0038
2018-08-10 2018-06-30 13F PTC THERAPEUTICS COM 69366J200 214,883 -3,730 -1.71 7,248 22.52 0.0029
2018-05-11 2018-03-31 13F PTC THERAPEUTICS COM 69366J200 218,613 -302,779 -58.07 5,916 -31.98 0.0025
2018-02-12 2017-12-31 13F PTC THERAPEUTICS COM 69366J200 521,392 -3,718 -0.71 8,697 -17.23 0.0036
2017-11-13 2017-09-30 13F PTC THERAPEUTICS COM 69366J200 525,110 -3,476 -0.66 10,507 8.44 0.0046
2017-08-11 2017-06-30 13F PTC THERAPEUTICS COM 69366J200 528,586 5,960 1.14 9,689 88.39 0.0045
2017-05-12 2017-03-31 13F PTC THERAPEUTICS COM 69366J200 522,626 210,166 67.26 5,143 50.87 0.0025
2017-02-09 2016-12-31 13F PTC THERAPEUTICS COM 69366J200 312,460 -958 -0.31 3,409 -22.36 0.0017
2016-11-10 2016-09-30 13F PTC THERAPEUTICS COM 69366J200 313,418 212,635 210.98 4,391 521.07 0.0024
2016-08-09 2016-06-30 13F PTC THERAPEUTICS COM 69366J200 100,783 100,783 707 0.0004
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.