RTW INVESTMENTS, LP: PTC THERAPEUTICS INC (PTCT): Quarterly 13F Position History
As of Q1 2026, RTW INVESTMENTS, LP reported 7,746,415 shares of PTC THERAPEUTICS INC (PTCT), worth $527.8M and representing 5.3% of its 13F equity book. The position first appeared in Q4 2016 and has been disclosed across 38 13F-HR filings in Pactolio's tracked window.
- 7,746,415Shares Held (Latest Filing)
- $527.8MReported Market Value (Latest Filing)
- 5.3%Portfolio Weight (% of 13F Equity Book)
- 0Quarter-over-Quarter Share Change
- -$60.7MQuarter-over-Quarter Value Change
- 7,746,415Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 38 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 7,746,415 | 0 | — | $527.8M | 5.3% | $68.1 |
| Q4 2025 | 7,746,415 | 0 | — | $588.4M | 5.9% | $76.0 |
| Q3 2025 | 7,746,415 | 0 | — | $475.4M | 5.9% | $61.4 |
| Q2 2025 | 7,746,415 | +263,288 | +3.5% | $378.3M | 5.4% | $48.8 |
| Q1 2025 | 7,483,127 | +90,000 | +1.2% | $381.3M | 5.8% | $51.0 |
| Q4 2024 | 7,393,127 | 0 | — | $333.7M | 5.0% | $45.1 |
| Q3 2024 | 7,393,127 | 0 | — | $274.3M | 4.0% | $37.1 |
| Q2 2024 | 7,393,127 | 30,843 | -0.4% | $226.1M | 3.5% | $30.6 |
| Q1 2024 | 7,423,970 | 0 | — | $216.0M | 3.2% | $29.1 |
| Q4 2023 | 7,423,970 | +188,774 | +2.6% | $204.6M | 3.2% | $27.6 |
| Q3 2023 | 7,235,196 | 0 | — | $162.1M | 3.4% | $22.4 |
| Q2 2023 | 7,235,196 | +141,898 | +2.0% | $294.3M | 5.6% | $40.7 |
| Q1 2023 | 7,093,298 | +1,477,911 | +26.3% | $343.6M | 7.2% | $48.4 |
| Q4 2022 | 5,615,387 | 5,193 | -0.1% | $214.3M | 4.4% | $38.2 |
| Q3 2022 | 5,620,580 | +575,273 | +11.4% | $282.2M | 6.5% | $50.2 |
| Q2 2022 | 5,045,307 | 175,921 | -3.4% | $202.1M | 5.2% | $40.1 |
| Q1 2022 | 5,221,228 | 72,738 | -1.4% | $194.8M | 4.0% | $37.3 |
| Q4 2021 | 5,293,966 | 0 | — | $210.9M | 3.1% | $39.8 |
| Q3 2021 | 5,293,966 | 0 | — | $197.0M | 3.0% | $37.2 |
| Q2 2021 | 5,293,966 | 0 | — | $223.8M | 3.4% | $42.3 |
| Q1 2021 | 5,293,966 | +1,072,130 | +25.4% | $250.7M | 3.9% | $47.3 |
| Q4 2020 | 4,221,836 | +228,550 | +5.7% | $257.7M | 4.3% | $61.0 |
| Q3 2020 | 3,993,286 | +30,166 | +0.8% | $186.7M | 4.5% | $46.8 |
| Q2 2020 | 3,963,120 | +30,374 | +0.8% | $201.1M | 5.7% | $50.7 |
| Q1 2020 | 3,932,746 | +100,266 | +2.6% | $175.4M | 7.6% | $44.6 |
| Q4 2019 | 3,832,480 | +181,119 | +5.0% | $184.1M | 7.0% | $48.0 |
| Q3 2019 | 3,651,361 | +514,000 | +16.4% | $123.5M | 7.3% | $33.8 |
| Q2 2019 | 3,137,361 | +623,090 | +24.8% | $141.2M | 7.5% | $45.0 |
| Q1 2019 | 2,514,271 | +591,925 | +30.8% | $94.6M | 6.5% | $37.6 |
| Q4 2018 | 1,922,346 | 1,353,245 | -41.3% | $66.0M | 6.1% | $34.3 |
| Q3 2018 | 3,275,591 | 798,099 | -19.6% | $154.0M | 9.2% | $47.0 |
| Q2 2018 | 4,073,690 | 64,270 | -1.6% | $137.4M | 9.9% | $33.7 |
| Q1 2018 | 4,137,960 | +7,845 | +0.2% | $112.0M | 10.7% | $27.1 |
| Q4 2017 | 4,130,115 | +634,972 | +18.2% | $68.9M | 11.6% | $16.7 |
| Q3 2017 | 3,495,143 | +190,929 | +5.8% | $69.9M | 12.2% | $20.0 |
| Q2 2017 | 3,304,214 | +1,998,571 | +153.1% | $60.6M | 12.8% | $18.3 |
| Q1 2017 | 1,305,643 | +308,477 | +30.9% | $12.8M | 3.4% | $9.8 |
| Q4 2016 | 997,166 | — | — | $10.9M | 4.1% | $10.9 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did RTW INVESTMENTS, LP first disclose a PTCT position in 13F-HR filings?
RTW INVESTMENTS, LP first reported PTC THERAPEUTICS INC (PTCT) on its 13F-HR filing for the period ending 2016-12-31 (Q4 2016). The position has appeared on 38 reported quarters within Pactolio's tracked window.
What was RTW INVESTMENTS, LP's most recent quarter-over-quarter share-count change in PTCT?
RTW INVESTMENTS, LP held the same 7,746,415 shares of PTCT between Q4 2025 and Q1 2026 — the reported share count was unchanged quarter-over-quarter.
Does the implied price-per-share represent RTW INVESTMENTS, LP's cost basis in PTCT?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.