PTC THERAPEUTICS INC (PTCT) Institutional Shareholders
PTC THERAPEUTICS INC (PTCT) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $6.35B in PTCT holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of PTCT tracked by InsiderSet, reporting ownership valued at approximately $882.20M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $880.64M, representing an estimated loss of -0.18% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 56% of the total disclosed PTCT value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Rtw Investments, Lp, Janus Henderson Group Plc, and several other long-term asset managers with concentrated positions in PTC THERAPEUTICS INC (PTCT).
This page ranks the largest institutional PTCT shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
352
Total Reported Value
$6.35B
Largest Holder
Blackrock, Inc.
Largest Position
$882.20M
Insider Transactions (90d)
50
Latest Filing Quarter
Q2 2026
New Institutional Positions
64
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.02% | 12,948,717 | $882,196,090 | $880,642,243 | -$1,553,847 | -0.18% | |
| Rtw Investments, Lp | 5.25% | 7,746,415 | $527,763,254 | $526,833,684 | -$929,570 | -0.18% | |
| Janus Henderson Group Plc | 0.24% | 7,193,433 | $489,997,100 | $489,225,378 | -$771,722 | -0.16% | |
| Vanguard Portfolio Management Llc | 0.02% | 4,804,594 | $327,336,989 | $326,760,438 | -$576,551 | -0.18% | |
| State Street Corp | 0.01% | 4,346,519 | $296,128,339 | $295,606,757 | -$521,582 | -0.18% | |
| Wellington Management Group Llp | 0.05% | 3,942,610 | $268,610,018 | $268,136,906 | -$473,112 | -0.18% | |
| Vanguard Capital Management Llc | 0.01% | 3,676,256 | $250,463,321 | $250,022,171 | -$441,150 | -0.18% | |
| Toronto Dominion Bank | 0.40% | 3,025,963 | $206,158,859 | $205,795,744 | -$363,115 | -0.18% | |
| Geode Capital Management, Llc | 0.01% | 2,209,954 | $150,589,658 | $150,298,972 | -$290,686 | -0.19% | |
| Armistice Capital, Llc | 4.67% | 2,074,449 | $141,332,210 | $141,083,276 | -$248,934 | -0.18% | |
| Bank Of America Corp | 0.01% | 1,886,841 | $128,550,476 | $128,324,056 | -$226,420 | -0.18% | |
| Hood River Capital Management Llc | 1.14% | 1,664,559 | $113,406,405 | $113,206,658 | -$199,747 | -0.18% | |
| D. E. Shaw & Co., Inc. | 0.09% | 1,640,381 | $111,759,157 | $111,562,312 | -$196,845 | -0.18% | |
| Fmr Llc | 0.01% | 1,528,362 | $104,127,329 | $103,943,900 | -$183,429 | -0.18% | |
| Tang Capital Management Llc | 5.19% | 1,500,000 | $102,195,000 | $102,015,000 | -$180,000 | -0.18% | |
| Pictet Asset Management Holding Sa | 0.09% | 1,147,844 | $93,629,635 | $78,064,870 | -$15,564,765 | -16.62% | |
| Ubs Group Ag | 0.02% | 1,364,768 | $92,981,644 | $92,817,872 | -$163,772 | -0.18% | |
| Jefferies Financial Group Inc. | 1.13% | 1,354,459 | $92,279,292 | $92,116,757 | -$162,535 | -0.18% | |
| Franklin Resources Inc | 0.02% | 1,121,388 | $76,400,144 | $76,265,598 | -$134,546 | -0.18% | |
| Driehaus Capital Management Llc | 0.51% | 1,015,772 | $69,204,546 | $69,082,654 | -$121,892 | -0.18% | |
| Palo Alto Investors Lp | 9.60% | 921,607 | $62,789,085 | $62,678,492 | -$110,593 | -0.18% | |
| Bnp Paribas Financial Markets | 0.04% | 920,476 | $62,712,030 | $62,601,573 | -$110,457 | -0.18% | |
| Dimensional Fund Advisors Lp | 0.01% | 890,715 | $60,674,282 | $60,577,527 | -$96,755 | -0.16% | |
| Invesco Ltd. | 0.01% | 865,451 | $58,963,177 | $58,859,323 | -$103,854 | -0.18% | |
| Goldman Sachs Group Inc | 0.01% | 827,631 | $56,386,500 | $56,287,184 | -$99,316 | -0.18% | |
| Northern Trust Corp | 0.01% | 806,276 | $54,931,584 | $54,834,831 | -$96,753 | -0.18% | |
| Woodline Partners Lp | 0.19% | 744,988 | $50,756,032 | $50,666,634 | -$89,398 | -0.18% | |
| Charles Schwab Investment Management Inc | 0.01% | 731,642 | $49,846,769 | $49,758,972 | -$87,797 | -0.18% | |
| Jupiter Asset Management Ltd | 0.26% | 711,457 | $48,471,565 | $48,386,191 | -$85,374 | -0.18% | |
| Morgan Stanley | 0.00% | 674,134 | $45,928,802 | $45,847,853 | -$80,949 | -0.18% | |
| Nuveen, Llc | 0.01% | 667,019 | $45,444,004 | $45,363,962 | -$80,042 | -0.18% | |
| Boston Partners | 0.05% | 647,482 | $44,112,149 | $44,035,251 | -$76,898 | -0.17% | |
| Defilade Capital Management, L.P. | 5.77% | 376,165 | $41,112,742 | $25,582,982 | -$15,529,760 | -37.77% | |
| Ensign Peak Advisors, Inc | 0.07% | 582,318 | $39,673,325 | $39,603,447 | -$69,878 | -0.18% | |
| Vanguard Fiduciary Trust Co | 0.01% | 553,658 | $37,720,720 | $37,654,281 | -$66,439 | -0.18% | |
| Renaissance Technologies LLC | Jim Simons | 0.06% | 533,300 | $36,333,729 | $36,269,733 | -$63,996 | -0.18% |
| Bank Of New York Mellon Corp | 0.01% | 522,763 | $35,615,829 | $35,553,112 | -$62,717 | -0.18% | |
| Principal Financial Group Inc | 0.02% | 515,001 | $35,087,018 | $35,025,218 | -$61,800 | -0.18% | |
| Qube Research & Technologies Ltd | 0.05% | 513,823 | $35,006,761 | $34,945,102 | -$61,659 | -0.18% | |
| Loomis Sayles & Co L P | 0.05% | 493,603 | $33,629,173 | $33,569,940 | -$59,233 | -0.18% | |
| Marshall Wace, Llp | 0.03% | 460,638 | $31,383,267 | $31,327,990 | -$55,277 | -0.18% | |
| Balyasny Asset Management L.P. | 0.06% | 460,564 | $31,378,225 | $31,322,958 | -$55,267 | -0.18% | |
| Parkman Healthcare Partners Llc | 3.05% | 431,364 | $29,388,829 | $29,337,066 | -$51,763 | -0.18% | |
| Manufacturers Life Insurance Company, The | 0.02% | 425,240 | $28,971,601 | $28,920,572 | -$51,029 | -0.18% | |
| Citadel Advisors Llc | 0.02% | 385,199 | $26,243,608 | $26,197,384 | -$46,224 | -0.18% | |
| Rockefeller Capital Management L.P. | 0.05% | 384,672 | $26,207,703 | $26,161,543 | -$46,160 | -0.18% | |
| Panagora Asset Management Inc | 0.09% | 351,370 | $23,938,838 | $23,896,674 | -$42,164 | -0.18% | |
| Mackenzie Financial Corp | 0.03% | 345,683 | $23,551,383 | $23,509,901 | -$41,482 | -0.18% | |
| Legal & General Group Plc | 0.01% | 343,380 | $23,394,479 | $23,353,274 | -$41,205 | -0.18% | |
| Voya Investment Management Llc | 0.02% | 342,637 | $23,343,859 | $23,302,742 | -$41,117 | -0.18% |
Frequently asked questions about PTCT
Who owns the most PTCT stock?
The largest holders of PTCT are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for PTC THERAPEUTICS INC (PTCT).
Is PTCT widely held by superinvestors?
Many widely followed stocks like PTCT appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly PTCT is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.