CTMX Institutional Ownership & Shareholders
CYTOMX THERAPEUTICS INC (CTMX) is currently held by 180 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $799.47M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Fmr Llc is currently the largest disclosed institutional shareholder of CTMX tracked by InsiderSet, reporting ownership valued at approximately $122.68M 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 $76.55M, representing an estimated loss of -37.60% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 64% of the total disclosed CTMX value among the investors covered in this analysis. Major shareholders include Fmr Llc, Kynam Capital Management, Lp, Blackrock, Inc., and several other long-term asset managers with concentrated positions in CYTOMX THERAPEUTICS INC (CTMX).
This page ranks the largest institutional CTMX 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
180
Total Reported Value
$799.47M
Largest Holder
Fmr Llc
Largest Position
$122.68M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
114
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Fmr Llc | 0.01% | 32,714,937 | $122,681,014 | $76,552,953 | -$46,128,061 | -37.60% | |
| Kynam Capital Management, Lp | 4.50% | 21,703,093 | $81,386,599 | $50,785,238 | -$30,601,361 | -37.60% | |
| Blackrock, Inc. | 0.00% | 17,559,822 | $65,849,333 | $41,089,983 | -$24,759,350 | -37.60% | |
| Bank Of America Corp | 0.00% | 15,082,617 | $56,559,813 | $35,293,324 | -$21,266,489 | -37.60% | |
| State Street Corp | 0.00% | 11,747,236 | $44,052,135 | $27,488,532 | -$16,563,603 | -37.60% | |
| Perceptive Advisors Llc | 0.61% | 10,439,185 | $39,146,944 | $24,427,693 | -$14,719,251 | -37.60% | |
| Vanguard Capital Management Llc | 0.00% | 8,525,457 | $31,970,464 | $19,949,569 | -$12,020,895 | -37.60% | |
| Point72 Asset Management, L.P. | 0.04% | 7,811,033 | $29,291,374 | $18,277,817 | -$11,013,557 | -37.60% | |
| Wellington Management Group Llp | 0.00% | 5,168,961 | $19,383,605 | $12,095,369 | -$7,288,236 | -37.60% | |
| Venrock Adviser, Llc | 0.57% | 4,982,124 | $18,682,965 | $11,658,170 | -$7,024,795 | -37.60% | |
| Baker Bros. Advisors Lp | 0.09% | 4,975,826 | $18,659,348 | $11,643,433 | -$7,015,915 | -37.60% | |
| Geode Capital Management, Llc | 0.00% | 4,678,716 | $17,548,248 | $10,948,195 | -$6,600,053 | -37.61% | |
| Elmind Capital, Lp | 4.29% | 4,550,000 | $17,062,500 | $10,647,000 | -$6,415,500 | -37.60% | |
| Nextech Invest, Ltd. | 0.79% | 4,449,932 | $16,687,245 | $10,412,841 | -$6,274,404 | -37.60% | |
| Two Sigma Investments, Lp | 0.01% | 4,132,643 | $15,497,411 | $9,670,385 | -$5,827,026 | -37.60% | |
| Eversept Partners, Lp | 0.73% | 3,558,497 | $13,344,364 | $8,326,883 | -$5,017,481 | -37.60% | |
| Ubs Group Ag | 0.00% | 3,468,359 | $13,006,346 | $8,115,960 | -$4,890,386 | -37.60% | |
| Siren, L.L.C. | 0.26% | 3,457,711 | $12,966,416 | $8,091,044 | -$4,875,372 | -37.60% | |
| Adar1 Capital Management, Llc | 0.59% | 3,365,118 | $12,619,193 | $7,874,376 | -$4,744,817 | -37.60% | |
| Citadel Advisors Llc | 0.01% | 3,110,509 | $11,664,409 | $7,278,591 | -$4,385,818 | -37.60% | |
| Marshall Wace, Llp | 0.01% | 3,024,351 | $11,341,320 | $7,076,981 | -$4,264,339 | -37.60% | |
| Woodline Partners Lp | 0.02% | 2,040,210 | $7,650,788 | $4,774,091 | -$2,876,697 | -37.60% | |
| Goldman Sachs Group Inc | 0.00% | 2,003,652 | $7,513,696 | $4,688,546 | -$2,825,150 | -37.60% | |
| Dimensional Fund Advisors Lp | 0.00% | 1,860,290 | $6,976,220 | $4,353,079 | -$2,623,141 | -37.60% | |
| Qube Research & Technologies Ltd | 0.01% | 1,824,564 | $6,842,115 | $4,269,480 | -$2,572,635 | -37.60% | |
| Vanguard Portfolio Management Llc | 0.00% | 1,751,167 | $6,566,876 | $4,097,731 | -$2,469,145 | -37.60% | |
| Millennium Management Llc | 0.00% | 1,685,830 | $6,321,862 | $3,944,842 | -$2,377,020 | -37.60% | |
| Northern Trust Corp | 0.00% | 1,675,183 | $6,281,937 | $3,919,928 | -$2,362,009 | -37.60% | |
| Tudor Investment Corp Et Al | 0.02% | 1,380,687 | $5,177,576 | $3,230,808 | -$1,946,768 | -37.60% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,267,430 | $4,752,863 | $2,965,786 | -$1,787,077 | -37.60% | |
| Seven Fleet Capital Management Lp | 0.67% | 1,085,398 | $4,070,243 | $2,539,831 | -$1,530,412 | -37.60% | |
| Sphera Funds Management Ltd. | 0.47% | 879,000 | $3,296,250 | $2,056,860 | -$1,239,390 | -37.60% | |
| Assenagon Asset Management S.A. | 0.00% | 1,181,259 | $3,213,024 | $2,764,146 | -$448,878 | -13.97% | |
| Ally Bridge Group (Ny) Llc | 3.75% | 775,000 | $2,906,250 | $1,813,500 | -$1,092,750 | -37.60% | |
| Ensign Peak Advisors, Inc | 0.01% | 592,473 | $2,784,623 | $1,386,387 | -$1,398,236 | -50.21% | |
| Gilder Gagnon Howe & Co Llc | 0.03% | 704,423 | $2,641,586 | $1,648,350 | -$993,236 | -37.60% | |
| Bank Of New York Mellon Corp | 0.00% | 684,539 | $2,567,022 | $1,601,821 | -$965,201 | -37.60% | |
| Deutsche Bank Ag\ | 0.00% | 663,038 | $2,486,394 | $1,551,509 | -$934,885 | -37.60% | |
| First Trust Advisors Lp | 0.00% | 599,696 | $2,248,860 | $1,403,289 | -$845,571 | -37.60% | |
| Charles Schwab Investment Management Inc | 0.00% | 549,875 | $2,062,031 | $1,286,708 | -$775,324 | -37.60% | |
| Raymond James Financial Inc | 0.00% | 484,222 | $1,815,833 | $1,133,079 | -$682,754 | -37.60% | |
| Schulhoff & Co Inc | 0.72% | 477,550 | $1,790,812 | $1,117,467 | -$673,345 | -37.60% | |
| Exome Asset Management Llc | 1.06% | 460,067 | $1,725,251 | $1,076,557 | -$648,694 | -37.60% | |
| Nuveen, Llc | 0.00% | 448,041 | $1,680,154 | $1,048,416 | -$631,738 | -37.60% | |
| Dafna Capital Management Llc | 0.31% | 438,407 | $1,644,026 | $1,025,872 | -$618,154 | -37.60% | |
| Jump Financial, Llc | 0.01% | 347,400 | $1,302,750 | $812,916 | -$489,834 | -37.60% | |
| Peak Financial Advisors Llc | 0.54% | 462,061 | $1,256,806 | $1,081,223 | -$175,583 | -13.97% | |
| Swiss National Bank | 0.00% | 325,400 | $1,220,250 | $761,436 | -$458,814 | -37.60% | |
| Caption Management, Llc | 0.04% | 300,000 | $1,125,000 | $702,000 | -$423,000 | -37.60% | |
| Citigroup Inc | 0.00% | 287,866 | $1,079,498 | $673,606 | -$405,892 | -37.60% |
Frequently asked questions about CTMX
Who are the largest institutional holders of CTMX?
The largest institutional holders of CTMX reported in the latest SEC Form 13F filings include Fmr Llc, Kynam Capital Management, Lp, Blackrock, Inc., Bank Of America Corp, and State Street Corp. InsiderSet ranks institutional holders by their latest reported CTMX position.
What is CTMX institutional ownership?
This page tracks CTMX positions reported by institutional investment managers through SEC Form 13F. CYTOMX THERAPEUTICS INC (CTMX) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own CTMX?
InsiderSet currently tracks 180 institutional managers reporting CTMX 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 CTMX shareholders.
How much CTMX stock do institutions own?
Institutional investment managers disclosed approximately $799.47M in CTMX holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was CTMX institutional ownership last updated?
The latest CTMX 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 CTMX 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 CTMX position after the reporting date.
Are institutions buying or selling CTMX?
Institutional buying and selling can be analyzed by comparing CTMX positions across consecutive 13F reporting periods. InsiderSet's CTMX Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View CTMX ownership changes.
How has CTMX institutional ownership changed over time?
InsiderSet tracks CTMX institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.