PTC Therapeutics, Inc.
US ˙ NasdaqGS ˙ US69366J2006

SecurityPTCT / PTC Therapeutics, Inc.
InstitutionAmalgamated Bank
Latest Disclosed Ownership22,959 shares
Latest Disclosed Value $ 1,564
Amalgamated Bank reports 0.70% decrease in ownership of PTCT / PTC Therapeutics, Inc.

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 22,959 shares of PTC Therapeutics, Inc. (US:PTCT) valued at $1,564,197 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 23,122 shares of PTC Therapeutics, Inc.. This represents a change in shares of -0.70% during the quarter. The current value of the position is $1,576,824 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-08 2026-03-31 13F PTC THERAPEUTICS COM 69366J200 22,959 -163 -0.70 2 0.00 0.0120
2026-02-05 2025-12-31 13F PTC THERAPEUTICS COM 69366J200 23,122 20,604 818.27 2 0.0127
2025-10-29 2025-09-30 13F PTC THERAPEUTICS COM 69366J200 2,518 -119 -4.51 0 0.0011
2025-08-04 2025-06-30 13F PTC THERAPEUTICS COM 69366J200 2,637 0 0.00 0 0.0010
2025-04-25 2025-03-31 13F PTC THERAPEUTICS COM 69366J200 2,637 108 4.27 0 0.0011
2025-02-04 2024-12-31 13F PTC THERAPEUTICS COM 69366J200 2,529 0 0.00 0 0.0009
2024-10-30 2024-09-30 13F PTC THERAPEUTICS COM 69366J200 2,529 0 0.00 0 0.0008
2024-08-12 2024-06-30 13F PTC THERAPEUTICS COM 69366J200 2,529 125 5.20 0 0.0007
2024-04-23 2024-03-31 13F PTC THERAPEUTICS COM 69366J200 2,404 -7,088 -74.67 0 0.0006
2024-02-06 2023-12-31 13F PTC THERAPEUTICS COM 69366J200 9,492 -715 -7.00 0 0.0021
2023-11-08 2023-09-30 13F PTC THERAPEUTICS COM 69366J200 10,207 190 1.90 0 0.0019
2023-08-11 2023-06-30 13F PTC THERAPEUTICS COM 69366J200 10,017 677 7.25 0 0.0033
2023-05-02 2023-03-31 13F PTC THERAPEUTICS COM 69366J200 9,340 -1,590 -14.55 0 0.0039
2023-02-10 2022-12-31 13F PTC THERAPEUTICS COM 69366J200 10,930 184 1.71 0 -100.00 0.0037
2022-11-09 2022-09-30 13F PTC THERAPEUTICS COM 69366J200 10,746 155 1.46 539 27.12 0.0052
2022-08-15 2022-06-30 13F PTC THERAPEUTICS COM 69366J200 10,591 -779 -6.85 424 0.00 0.0040
2022-08-25 2022-03-31 13F/A-1 PTC THERAPEUTICS COM 69366J200 11,370 -854 -6.99 424 -12.94 0.0033
2022-06-30 2022-03-31 13F PTC THERAPEUTICS COM 69366J200 11,370 -854 424 0.0034
2022-02-15 2021-12-31 13F/A-1 PTC THERAPEUTICS COM 69366J200 12,224 -131 -1.06 487 5.87 0.0036
2022-02-15 2021-12-31 13F PTC THERAPEUTICS COM 69366J200 12,224 -131 487 0.0036
2021-10-29 2021-09-30 13F PTC THERAPEUTICS COM 69366J200 12,355 -761 -5.80 460 -16.97 0.0039
2021-08-16 2021-06-30 13F PTC THERAPEUTICS COM 69366J200 13,116 4,317 49.06 554 32.85 0.0044
2021-05-13 2021-03-31 13F PTC THERAPEUTICS COM 69366J200 8,799 -860 -8.90 417 -29.20 0.0156
2021-02-12 2020-12-31 13F PTC THERAPEUTICS COM 69366J200 9,659 50 0.52 589 31.18 0.0223
2020-10-30 2020-09-30 13F PTC THERAPEUTICS COM 69366J200 9,609 -278 -2.81 449 -10.56 0.0195
2020-08-10 2020-06-30 13F PTC THERAPEUTICS COM 69366J200 9,887 -913 -8.45 502 4.15 0.0232
2020-05-13 2020-03-31 13F PTC THERAPEUTICS COM 69366J200 10,800 -338 -3.03 482 -9.91 0.0118
2020-02-13 2019-12-31 13F PTC THERAPEUTICS COM 69366J200 11,138 990 9.76 535 55.98 0.0098
2019-11-13 2019-09-30 13F PTC THERAPEUTICS COM 69366J200 10,148 -127 -1.24 343 -25.76 0.0072
2019-08-14 2019-06-30 13F PTC THERAPEUTICS COM 69366J200 10,275 2,753 36.60 462 63.25 0.0108
2019-05-15 2019-03-31 13F PTC THERAPEUTICS COM 69366J200 7,522 890 13.42 283 24.12 0.0069
2019-02-15 2018-12-31 13F PTC THERAPEUTICS COM 69366J200 6,632 6,632 228 0.0065
2018-11-14 2018-09-30 13F PTC THERAPEUTICS COM 69366J200 0 -6,896 -100.00 0 -100.00
2018-07-18 2018-06-30 13F PTC THERAPEUTICS COM 69366J200 6,896 6,896 233 0.0057
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.