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Equibles

LOOMIS SAYLES & CO L P

Position in PTCT — Ptc Therapeutics, Inc.

CIK 312348 BOSTON, MA
Back to PTCT Full portfolio

Position in PTCT

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$48,156,806
+$14,527,635 QoQ
Shares Held
590,374
+19.6% QoQ
Ownership
0.707%
of shares outstanding
% of Portfolio
0.06%
of 13F equity value
Holder Rank
#40
of 383 holders
Holding Since
Mar 2020
16 quarters on record
Voting authority Sole 98% Shared 0% None 2%

Common Shares in PTCT Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

LOOMIS SAYLES & CO L P holds $4,120,076,195 across 24 Biotechnology names. PTCT ranks #10 (1.2% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 VRTX
Vertex Pharmaceuticals Inc / Ma
 3,920,953 $1,947,654,982
2 REGN
Regeneron Pharmaceuticals, Inc.
 1,859,172 $1,159,268,108
3 ALNY
Alnylam Pharmaceuticals, Inc.
 580,187 $174,653,692
4 LGND
Ligand Pharmaceuticals Inc
 291,805 $92,236,641
5 TWST
Twist Bioscience Corp
 861,309 $88,611,468
6 AXSM
Axsome Therapeutics, Inc.
 239,490 $58,619,966
7 VCEL
Vericel Corp
 1,200,239 $53,398,633
8 MIRM
Mirum Pharmaceuticals, Inc.
 443,636 $51,936,466

All Filings in PTCT

Export CSV
16 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $48,156,806 590,374
2026-03-31 $33,629,171 493,603
2023-06-30 $43,167,056 1,061,398
2023-03-31 $59,633,611 1,231,082
2022-12-31 $46,806,534 1,226,265
2022-09-30 $81,268,478 1,618,894
2022-06-30 $65,571,609 1,636,835
2022-03-31 $61,441,510 1,646,784
2021-12-31 $61,187,761 1,536,223
2021-09-30 $47,935,967 1,288,255
2021-06-30 $38,250,840 904,917
2021-03-31 $42,755,439 902,966
2020-12-31 $52,819,023 865,460
2020-09-30 $37,297,944 797,817
2020-06-30 $33,819,732 666,530
2020-03-31 $19,590,526 439,151