PTC Therapeutics, Inc.
US ˙ NasdaqGS ˙ US69366J2006

SecurityPTCT / PTC Therapeutics, Inc.
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership46,154 shares
Latest Disclosed Value $ 3,144,472
Engineers Gate Manager LP reports 25.73% increase in ownership of PTCT / PTC Therapeutics, Inc.

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 46,154 shares of PTC Therapeutics, Inc. (US:PTCT) valued at $3,144,472 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 36,709 shares of PTC Therapeutics, Inc.. This represents a change in shares of 25.73% during the quarter. The current value of the position is $3,169,857 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)
2026-05-15 2026-03-31 13F PTC THERAPEUTICS COM 69366J200 46,154 9,445 25.73 3,144 12.77 0.0393
2026-02-17 2025-12-31 13F PTC THERAPEUTICS COM 69366J200 36,709 25,486 227.09 2,788 305.23 0.0331
2025-11-14 2025-09-30 13F PTC THERAPEUTICS COM 69366J200 11,223 -13,131 -53.92 689 -42.14 0.0079
2025-08-14 2025-06-30 13F PTC THERAPEUTICS COM 69366J200 24,354 -36,622 -60.06 1,189 -61.73 0.0148
2025-05-15 2025-03-31 13F PTC THERAPEUTICS COM 69366J200 60,976 24,683 68.01 3,107 89.68 0.0524
2025-02-14 2024-12-31 13F PTC THERAPEUTICS COM 69366J200 36,293 -11,736 -24.44 1,638 -8.03 0.0285
2024-11-14 2024-09-30 13F PTC THERAPEUTICS COM 69366J200 48,029 -46,256 -49.06 1,782 -38.22 0.0348
2024-08-14 2024-06-30 13F PTC THERAPEUTICS COM 69366J200 94,285 28,579 43.50 2,883 50.86 0.0650
2024-05-15 2024-03-31 13F PTC THERAPEUTICS COM 69366J200 65,706 -3,809 -5.48 1,911 -0.21 0.0503
2024-02-14 2023-12-31 13F PTC THERAPEUTICS COM 69366J200 69,515 21,912 46.03 1,916 79.64 0.0547
2023-11-14 2023-09-30 13F PTC THERAPEUTICS COM 69366J200 47,603 39,935 520.80 1,067 242.77 0.0394
2023-08-14 2023-06-30 13F PTC THERAPEUTICS COM 69366J200 7,668 7,668 312 0.0118
2023-05-15 2023-03-31 13F PTC THERAPEUTICS COM 69366J200 0 -9,864 -100.00 0 -100.00
2023-02-14 2022-12-31 13F PTC THERAPEUTICS COM 69366J200 9,864 458 4.87 377 -20.34 0.0226
2022-11-14 2022-09-30 13F PTC THERAPEUTICS COM 69366J200 9,406 2,638 38.98 472 74.17 0.0294
2022-08-15 2022-06-30 13F PTC THERAPEUTICS COM 69366J200 6,768 -236 -3.37 271 3.83 0.0099
2022-05-16 2022-03-31 13F PTC THERAPEUTICS COM 69366J200 7,004 7,004 261 0.0102
2022-02-14 2021-12-31 13F PTC THERAPEUTICS COM 69366J200 0 -27,116 -100.00 0 -100.00
2021-11-15 2021-09-30 13F PTC THERAPEUTICS COM 69366J200 27,116 27,116 1,009 0.0575
2021-08-16 2021-06-30 13F PTC THERAPEUTICS COM 69366J200 0 -5,660 -100.00 0 -100.00
2021-05-17 2021-03-31 13F PTC THERAPEUTICS COM 69366J200 5,660 -4,338 -43.39 268 -56.07 0.0133
2021-02-16 2020-12-31 13F PTC THERAPEUTICS COM 69366J200 9,998 -151 -1.49 610 28.69 0.0265
2020-11-16 2020-09-30 13F PTC THERAPEUTICS COM 69366J200 10,149 10,149 474 0.0222
2020-08-17 2020-06-30 13F PTC THERAPEUTICS COM 69366J200 0 -16,824 -100.00 0 -100.00
2020-05-15 2020-03-31 13F PTC THERAPEUTICS COM 69366J200 16,824 9,463 128.56 751 112.15 0.0541
2020-02-14 2019-12-31 13F PTC THERAPEUTICS COM 69366J200 7,361 -16,811 -69.55 354 -56.67 0.0156
2019-11-14 2019-09-30 13F PTC THERAPEUTICS COM 69366J200 24,172 24,172 817 0.0415
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.