PBLS Institutional Ownership & Shareholders
Parabilis Medicines, Inc. (PBLS) is currently held by 87 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $2.55B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Ra Capital Management, L.P. is currently the largest disclosed institutional shareholder of PBLS tracked by InsiderSet, reporting ownership valued at approximately $791.91M in its June 30, 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 $788.43M, representing an estimated loss of -0.44% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 80% of the total disclosed PBLS value among the investors covered in this analysis. Major shareholders include Ra Capital Management, L.P., Fmr Llc, Arch Venture Management, Llc, and several other long-term asset managers with concentrated positions in Parabilis Medicines, Inc. (PBLS).
This page ranks the largest institutional PBLS 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
87
Total Reported Value
$2.55B
Largest Holder
Ra Capital Management, L.P.
Largest Position
$791.91M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
89
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Ra Capital Management, L.P. | 6.88% | 28,933,371 | $791,906,364 | $788,434,360 | -$3,472,004 | -0.44% | |
| Fmr Llc | 0.01% | 10,292,735 | $281,712,158 | $280,477,029 | -$1,235,129 | -0.44% | |
| Arch Venture Management, Llc | 15.95% | 6,412,780 | $175,517,789 | $174,748,255 | -$769,534 | -0.44% | |
| Venbio Partners Llc | 27.75% | 5,266,697 | $144,149,497 | $143,517,493 | -$632,004 | -0.44% | |
| Alphabet Inc. | 0.14% | 4,919,498 | $134,646,660 | $134,056,321 | -$590,340 | -0.44% | |
| Nextech Invest, Ltd. | 6.06% | 4,663,176 | $127,631,127 | $127,071,546 | -$559,581 | -0.44% | |
| Cormorant Asset Management, Lp | 6.47% | 4,615,612 | $126,329,300 | $125,775,427 | -$553,873 | -0.44% | |
| Regeneron Pharmaceuticals, Inc. | 64.35% | 4,166,666 | $114,041,648 | $113,541,649 | -$500,000 | -0.44% | |
| Siren, L.L.C. | 1.66% | 2,992,259 | $81,898,129 | $81,539,058 | -$359,071 | -0.44% | |
| Frazier Life Sciences Management, L.P. | 1.14% | 1,920,805 | $52,572,433 | $52,341,936 | -$230,497 | -0.44% | |
| Deerfield Management Company, L.P. | 0.54% | 1,880,704 | $51,474,868 | $51,249,184 | -$225,684 | -0.44% | |
| General Catalyst Group Management, Llc | 23.24% | 1,600,937 | $43,817,646 | $43,625,533 | -$192,113 | -0.44% | |
| General Atlantic, L.P. | 1.45% | 1,538,461 | $42,107,678 | $41,923,062 | -$184,616 | -0.44% | |
| Soleus Capital Management, L.P. | 1.38% | 1,465,070 | $40,098,966 | $39,923,158 | -$175,809 | -0.44% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,302,479 | $35,648,850 | $35,492,553 | -$156,297 | -0.44% | |
| Vanguard Capital Management Llc | 0.00% | 1,156,962 | $31,666,050 | $31,527,215 | -$138,836 | -0.44% | |
| Jpmorgan Chase & Co | 0.00% | 1,042,772 | $30,438,515 | $28,415,537 | -$2,022,978 | -6.65% | |
| Foresite Capital Management Vi Llc | 4.26% | 999,044 | $27,343,834 | $27,223,949 | -$119,885 | -0.44% | |
| Alliancebernstein L.P. | 0.01% | 810,279 | $22,177,336 | $22,080,103 | -$97,233 | -0.44% | |
| Price T Rowe Associates Inc | 0.00% | 751,947 | $20,581,000 | $20,490,556 | -$90,444 | -0.44% | |
| Casdin Capital, Llc | 0.88% | 645,690 | $17,672,535 | $17,595,053 | -$77,483 | -0.44% | |
| Venrock Adviser, Llc | 0.52% | 625,000 | $17,106,250 | $17,031,250 | -$75,000 | -0.44% | |
| Rock Springs Capital Management Lp | 0.77% | 578,028 | $15,820,626 | $15,751,263 | -$69,363 | -0.44% | |
| Samsara Biocapital, Llc | 1.25% | 556,044 | $15,218,924 | $15,152,199 | -$66,725 | -0.44% | |
| Logos Global Management Lp | 0.62% | 525,000 | $14,369,250 | $14,306,250 | -$63,000 | -0.44% | |
| Baker Bros. Advisors Lp | 0.07% | 500,000 | $13,685,000 | $13,625,000 | -$60,000 | -0.44% | |
| Bellevue Group Ag | 0.29% | 500,000 | $13,685,000 | $13,625,000 | -$60,000 | -0.44% | |
| Marshall Wace, Llp | 0.01% | 445,359 | $12,189,476 | $12,136,033 | -$53,443 | -0.44% | |
| Iconiq Capital, Llc | 0.28% | 350,000 | $9,579,500 | $9,537,500 | -$42,000 | -0.44% | |
| Massachusetts Financial Services Co | 0.00% | 295,962 | $8,100,480 | $8,064,965 | -$35,516 | -0.44% | |
| Kynam Capital Management, Lp | 0.38% | 250,000 | $6,842,500 | $6,812,500 | -$30,000 | -0.44% | |
| Federated Hermes, Inc. | 0.01% | 246,200 | $6,738,494 | $6,708,950 | -$29,544 | -0.44% | |
| Ameriprise Financial Inc | 0.00% | 174,773 | $4,783,536 | $4,762,564 | -$20,972 | -0.44% | |
| Driehaus Capital Management Llc | 0.02% | 100,000 | $2,737,000 | $2,725,000 | -$12,000 | -0.44% | |
| Geode Capital Management, Llc | 0.00% | 99,358 | $2,719,428 | $2,707,506 | -$11,923 | -0.44% | |
| Td Asset Management Inc | 0.00% | 76,982 | $2,106,997 | $2,097,760 | -$9,238 | -0.44% | |
| Squarepoint Ops Llc | 0.00% | 48,484 | $1,327,007 | $1,321,189 | -$5,818 | -0.44% | |
| Tudor Investment Corp Et Al | 0.00% | 44,045 | $1,205,512 | $1,200,226 | -$5,286 | -0.44% | |
| Ubs Group Ag | 0.00% | 38,698 | $1,059,164 | $1,054,521 | -$4,644 | -0.44% | |
| Winton Group Ltd | 0.03% | 34,900 | $955,213 | $951,025 | -$4,188 | -0.44% | |
| Vanguard Fiduciary Trust Co | 0.00% | 27,800 | $760,886 | $757,550 | -$3,336 | -0.44% | |
| Balyasny Asset Management L.P. | 0.00% | 24,264 | $664,106 | $661,194 | -$2,912 | -0.44% | |
| Hudson Bay Capital Management Lp | 0.00% | 22,690 | $621,025 | $618,303 | -$2,723 | -0.44% | |
| Brevan Howard Capital Management Lp | 0.01% | 22,565 | $617,604 | $614,896 | -$2,708 | -0.44% | |
| Matisse Capital | 0.22% | 17,300 | $558,617 | $471,425 | -$87,192 | -15.61% | |
| Ghisallo Capital Management Llc | 0.01% | 20,000 | $547,400 | $545,000 | -$2,400 | -0.44% | |
| Mitsubishi Ufj Asset Management Co., Ltd. | 0.00% | 19,200 | $525,504 | $523,200 | -$2,304 | -0.44% | |
| Strs Ohio | 0.00% | 10,700 | $345,503 | $291,575 | -$53,928 | -15.61% | |
| Vanguard Personalized Indexing Management, Llc | 0.00% | 11,729 | $321,023 | $319,615 | -$1,408 | -0.44% | |
| Alyeska Investment Group, L.P. | 0.00% | 10,000 | $273,700 | $272,500 | -$1,200 | -0.44% |
Frequently asked questions about PBLS
Who are the largest institutional holders of PBLS?
The largest institutional holders of PBLS reported in the latest SEC Form 13F filings include Ra Capital Management, L.P., Fmr Llc, Arch Venture Management, Llc, Venbio Partners Llc, and Alphabet Inc.. InsiderSet ranks institutional holders by their latest reported PBLS position.
What is PBLS institutional ownership?
This page tracks PBLS positions reported by institutional investment managers through SEC Form 13F. Parabilis Medicines, Inc. (PBLS) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own PBLS?
InsiderSet currently tracks 87 institutional managers reporting PBLS holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of PBLS shareholders.
How much PBLS stock do institutions own?
Institutional investment managers disclosed approximately $2.55B in PBLS holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was PBLS institutional ownership last updated?
The latest PBLS institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional PBLS holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its PBLS position after the reporting date.
Are institutions buying or selling PBLS?
Institutional buying and selling can be analyzed by comparing PBLS positions across consecutive 13F reporting periods. InsiderSet's PBLS Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View PBLS ownership changes.
How has PBLS institutional ownership changed over time?
InsiderSet tracks PBLS institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.