PTC Therapeutics, Inc.
US ˙ NasdaqGS ˙ US69366J2006

SecurityPTCT / PTC Therapeutics, Inc.
InstitutionMackenzie Financial Corp
Latest Disclosed Ownership345,683 shares
Latest Disclosed Value $ 23,551,383
Mackenzie Financial Corp reports 45.91% increase in ownership of PTCT / PTC Therapeutics, Inc.

On May 13, 2026 - Mackenzie Financial Corp filed a 13F-HR form disclosing ownership of 345,683 shares of PTC Therapeutics, Inc. (US:PTCT) valued at $23,551,383 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 236,909 shares of PTC Therapeutics, Inc.. This represents a change in shares of 45.91% during the quarter. The current value of the position is $23,741,508 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)
2026-05-13 2026-03-31 13F PTC THERAPEUTICS COM 69366J200 345,683 108,774 45.91 23,551 30.74 0.0283
2026-02-18 2025-12-31 13F PTC THERAPEUTICS COM 69366J200 236,909 35,117 17.40 18,015 45.47 0.0213
2025-11-13 2025-09-30 13F PTC THERAPEUTICS COM 69366J200 201,792 175,506 667.68 12,384 865.16 0.0150
2025-08-13 2025-06-30 13F PTC THERAPEUTICS COM 69366J200 26,286 194 0.74 1,284 -3.46 0.0017
2025-05-07 2025-03-31 13F PTC THERAPEUTICS COM 69366J200 26,092 3,316 14.56 1,330 29.28 0.0019
2025-05-02 2024-12-31 13F/A-2 PTC THERAPEUTICS COM 69366J200 22,776 12,967 132.19 1,028 183.20 0.0014
2025-02-20 2024-12-31 13F/A-1 PTC THERAPEUTICS COM 69366J200 22,776 12,967 1,028 0.0013
2025-02-14 2024-12-31 13F PTC Therapeutics Common Stock 69366J200 22,776 12,967 669 0.0010
2024-11-13 2024-09-30 13F PTC THERAPEUTICS COM 69366J200 9,809 440 4.70 364 26.92 0.0005
2024-08-14 2024-06-30 13F PTC THERAPEUTICS COM 69366J200 9,369 9,369 287 0.0004
2023-10-25 2023-09-30 13F PTC THERAPEUTICS COM 69366J200 0 -5,627 -100.00 0 -100.00
2023-08-03 2023-06-30 13F PTC THERAPEUTICS COM 69366J200 5,627 -8,102 -59.01 233 -64.96 0.0004
2023-04-24 2023-03-31 13F PTC THERAPEUTICS COM 69366J200 13,729 7,800 131.56 665 194.25 0.0010
2023-02-14 2022-12-31 13F PTC THERAPEUTICS COM 69366J200 5,929 1,168 24.53 226 -5.44 0.0004
2022-10-07 2022-09-30 13F PTC Therapeutics Common Stock 69366J200 4,761 4,761 239 0.0004
2019-05-15 2019-03-31 13F PTC THERAPEUTICS COM 69366J200 0 -7,060 -100.00 0 -100.00
2019-02-06 2018-12-31 13F PTC THERAPEUTICS COM 69366J200 7,060 7,060 242 0.0006
2017-02-14 2016-12-31 13F PTC THERAPEUTICS COM 69366J200 0 -27,400 -100.00 0 -100.00
2016-11-15 2016-09-30 13F PTC THERAPEUTICS COM 69366J200 27,400 -110,800 -80.17 384 -60.41 0.0024
2016-08-12 2016-06-30 13F PTC THERAPEUTICS COM 69366J200 138,200 0 0.00 970 8.99 0.0055
2016-05-12 2016-03-31 13F PTC THERAPEUTICS COM 69366J200 138,200 36,900 36.43 890 -72.88 0.0081
2016-02-12 2015-12-31 13F PTC THERAPEUTICS COM 69366J200 101,300 5,000 5.19 3,282 27.65 0.0204
2015-11-13 2015-09-30 13F PTC THERAPEUTICS COM 69366J200 96,300 8,900 10.18 2,571 -38.89 0.0156
2015-08-13 2015-06-30 13F PTC THERAPEUTICS COM 69366J200 87,400 32,100 58.05 4,207 25.02 0.0228
2015-05-13 2015-03-31 13F PTC THERAPEUTICS COM 69366J200 55,300 23,800 75.56 3,365 106.32 0.0177
2015-02-11 2014-12-31 13F PTC THERAPEUTICS COM 69366J200 31,500 31,500 1,631 0.0083
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.