PTC Therapeutics, Inc.
US ˙ NasdaqGS ˙ US69366J2006

SecurityPTCT / PTC Therapeutics, Inc.
InstitutionPinnacle Associates Ltd
Latest Disclosed Ownership74,956 shares
Latest Disclosed Value $ 5,106,752
Pinnacle Associates Ltd reports 10.16% decrease in ownership of PTCT / PTC Therapeutics, Inc.

On April 21, 2026 - Pinnacle Associates Ltd filed a 13F-HR form disclosing ownership of 74,956 shares of PTC Therapeutics, Inc. (US:PTCT) valued at $5,106,752 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 83,431 shares of PTC Therapeutics, Inc.. This represents a change in shares of -10.16% during the quarter. The current value of the position is $5,147,978 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)
2026-04-21 2026-03-31 13F PTC THERAPEUTICS COM 69366J200 74,956 -8,475 -10.16 5,107 -19.43 0.0655
2026-02-05 2025-12-31 13F PTC THERAPEUTICS COM 69366J200 83,431 -5,161 -5.83 6,337 16.57 0.0800
2025-11-13 2025-09-30 13F PTC THERAPEUTICS COM 69366J200 88,592 -3,916 -4.23 5,437 20.32 0.0721
2025-08-04 2025-06-30 13F PTC THERAPEUTICS COM 69366J200 92,508 -31,930 -25.66 4,518 -28.75 0.0654
2025-05-06 2025-03-31 13F PTC THERAPEUTICS COM 69366J200 124,438 -5,585 -4.30 6,341 8.04 0.0929
2025-02-14 2024-12-31 13F PTC THERAPEUTICS COM 69366J200 130,023 -24,181 -15.68 5,869 38.13 0.0796
2024-10-25 2024-09-30 13F PTC THERAPEUTICS COM 69366J200 154,204 300 0.19 4,250 -9.71 0.0723
2024-07-30 2024-06-30 13F PTC THERAPEUTICS COM 69366J200 153,904 -3,034 -1.93 4,706 3.09 0.0737
2024-04-26 2024-03-31 13F PTC THERAPEUTICS COM 69366J200 156,938 2,734 1.77 4,565 7.44 0.0720
2024-01-19 2023-12-31 13F PTC THERAPEUTICS COM 69366J200 154,204 -2,974 -1.89 4,250 20.64 0.0715
2023-10-24 2023-09-30 13F PTC THERAPEUTICS COM 69366J200 157,178 -6,822 -4.16 3,522 -47.19 0.0655
2023-07-27 2023-06-30 13F PTC THERAPEUTICS COM 69366J200 164,000 -6,084 -3.58 6,670 -19.05 0.1157
2023-05-05 2023-03-31 13F PTC THERAPEUTICS COM 69366J200 170,084 -2,519 -1.46 8,239 25.05 0.1685
2023-02-01 2022-12-31 13F/A-1 PTC THERAPEUTICS COM 69366J200 172,603 -5,495 -3.09 6,588 -26.32 0.1436
2023-01-25 2022-12-31 13F PTC THERAPEUTICS COM 69366J200 174,483 -3,615 6,936 0.0001
2022-11-01 2022-09-30 13F PTC THERAPEUTICS COM 69366J200 178,098 -5,878 -3.19 8,941 21.32 0.2052
2022-08-02 2022-06-30 13F PTC THERAPEUTICS COM 69366J200 183,976 -605 -0.33 7,370 7.01 0.1607
2022-05-05 2022-03-31 13F PTC THERAPEUTICS COM 69366J200 184,581 -8,100 -4.20 6,887 -10.26 0.1219
2022-02-02 2021-12-31 13F PTC THERAPEUTICS COM 69366J200 192,681 -83 -0.04 7,674 6.98 0.1324
2021-10-19 2021-09-30 13F PTC THERAPEUTICS COM 69366J200 192,764 30,930 19.11 7,173 4.85 0.1322
2021-08-02 2021-06-30 13F PTC THERAPEUTICS COM 69366J200 161,834 60,014 58.94 6,841 41.90 0.1237
2021-05-12 2021-03-31 13F PTC THERAPEUTICS COM 69366J200 101,820 -11,195 -9.91 4,821 -30.10 0.0919
2021-01-26 2020-12-31 13F PTC THERAPEUTICS COM 69366J200 113,015 -7,611 -6.31 6,897 22.31 0.1400
2020-10-23 2020-09-30 13F PTC THERAPEUTICS COM 69366J200 120,626 -5,363 -4.26 5,639 -11.79 0.1339
2020-08-14 2020-06-30 13F PTC THERAPEUTICS COM 69366J200 125,989 -2,475 -1.93 6,393 11.55 0.1576
2020-05-13 2020-03-31 13F PTC THERAPEUTICS COM 69366J200 128,464 -20,824 -13.95 5,731 -20.07 0.1741
2020-02-03 2019-12-31 13F PTC THERAPEUTICS COM 69366J200 149,288 -15,130 -9.20 7,170 28.93 0.1570
2019-11-08 2019-09-30 13F PTC THERAPEUTICS COM 69366J200 164,418 -7,670 -4.46 5,561 -28.19 0.1310
2019-08-05 2019-06-30 13F PTC THERAPEUTICS COM 69366J200 172,088 -16,435 -8.72 7,744 9.13 0.1813
2019-05-10 2019-03-31 13F PTC THERAPEUTICS COM 69366J200 188,523 -4,235 -2.20 7,096 7.27 0.1603
2019-02-05 2018-12-31 13F PTC THERAPEUTICS COM 69366J200 192,758 -8,449 -4.20 6,615 -30.05 0.1708
2018-11-09 2018-09-30 13F PTC THERAPEUTICS COM 69366J200 201,207 -33,775 -14.37 9,457 19.32 0.1962
2018-08-08 2018-06-30 13F PTC THERAPEUTICS COM 69366J200 234,982 -42,380 -15.28 7,926 5.61 0.1631
2018-05-11 2018-03-31 13F PTC THERAPEUTICS COM 69366J200 277,362 -12,070 -4.17 7,505 55.45 0.1471
2018-02-12 2017-12-31 13F PTC THERAPEUTICS COM 69366J200 289,432 -29,380 -9.22 4,828 -24.31 0.0928
2017-11-13 2017-09-30 13F PTC THERAPEUTICS COM 69366J200 318,812 -8,110 -2.48 6,379 6.46 0.1176
2017-08-09 2017-06-30 13F PTC THERAPEUTICS COM 69366J200 326,922 -15,750 -4.60 5,992 77.70 0.1152
2017-05-09 2017-03-31 13F PTC THERAPEUTICS COM 69366J200 342,672 -8,750 -2.49 3,372 -12.05 0.0644
2017-02-10 2016-12-31 13F PTC THERAPEUTICS COM 69366J200 351,422 -26,887 -7.11 3,834 -27.66 0.0774
2016-11-14 2016-09-30 13F PTC THERAPEUTICS COM 69366J200 378,309 -9,330 -2.41 5,300 94.78 0.1063
2016-08-15 2016-06-30 13F PTC THERAPEUTICS COM 69366J200 387,639 -22,473 -5.48 2,721 3.03 0.0586
2016-05-13 2016-03-31 13F PTC THERAPEUTICS COM 69366J200 410,112 30,020 7.90 2,641 -78.55 0.0565
2016-02-11 2015-12-31 13F/A-1 PTC THERAPEUTICS COM 69366J200 380,092 141,322 59.19 12,315 93.18 0.2584
2016-02-09 2015-12-31 13F PTC THERAPEUTICS COM 69366J200 380,092 141,322 12,315 0.2632
2015-11-10 2015-09-30 13F PTC THERAPEUTICS COM 69366J200 238,770 238,770 6,375 0.1411
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.