CYTOMX THERAPEUTICS INC (CTMX) Top Institutional Shareholders
CYTOMX THERAPEUTICS INC (CTMX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $905.92M in CTMX holdings during the latest filing period.
Fmr Llc is currently the largest disclosed institutional shareholder of CTMX tracked by InsiderSet, reporting ownership valued at approximately $150.19M 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 $94.59M, representing an estimated loss of -37.02% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 57% of the total disclosed CTMX value among the investors covered in this analysis. Major shareholders include Fmr Llc, Kynam Capital Management, Lp, Bank Of America Corp, 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
177
Total Reported Value
$905.92M
Largest Holder
Fmr Llc
Largest Position
$150.19M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
198
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% | 31,955,637 | $150,191,494 | $94,588,686 | -$55,602,808 | -37.02% | |
| Kynam Capital Management, Lp | 4.48% | 15,013,093 | $70,561,537 | $44,438,755 | -$26,122,782 | -37.02% | |
| Bank Of America Corp | 0.00% | 10,202,785 | $47,953,089 | $30,200,244 | -$17,752,845 | -37.02% | |
| Perceptive Advisors Llc | 0.94% | 10,098,824 | $47,464,473 | $29,892,519 | -$17,571,954 | -37.02% | |
| Venrock Adviser, Llc | 1.75% | 9,982,124 | $46,915,983 | $29,547,087 | -$17,368,896 | -37.02% | |
| Vanguard Capital Management Llc | 0.00% | 8,733,118 | $41,045,655 | $25,850,029 | -$15,195,626 | -37.02% | |
| Point72 Asset Management, L.P. | 0.06% | 7,875,390 | $37,014,333 | $23,311,154 | -$13,703,179 | -37.02% | |
| State Street Corp | 0.00% | 5,663,408 | $26,618,018 | $16,763,688 | -$9,854,330 | -37.02% | |
| Citadel Advisors Llc | 0.02% | 5,406,193 | $25,409,107 | $16,002,331 | -$9,406,776 | -37.02% | |
| Blackrock, Inc. | 0.00% | 5,228,280 | $24,572,917 | $15,475,709 | -$9,097,208 | -37.02% | |
| Baker Bros. Advisors Lp | 0.13% | 4,975,826 | $23,386,382 | $14,728,445 | -$8,657,937 | -37.02% | |
| Elmind Capital, Lp | 6.07% | 4,550,000 | $21,385,000 | $13,468,000 | -$7,917,000 | -37.02% | |
| Nextech Invest, Ltd. | 1.47% | 4,449,932 | $20,914,680 | $13,171,799 | -$7,742,881 | -37.02% | |
| Marshall Wace, Llp | 0.02% | 4,138,176 | $19,449,427 | $12,249,001 | -$7,200,426 | -37.02% | |
| Millennium Management Llc | 0.01% | 3,660,190 | $17,202,893 | $10,834,162 | -$6,368,731 | -37.02% | |
| Wellington Management Group Llp | 0.00% | 3,582,985 | $16,840,029 | $10,605,636 | -$6,234,393 | -37.02% | |
| Siren, L.L.C. | 0.45% | 3,457,711 | $16,251,242 | $10,234,825 | -$6,016,417 | -37.02% | |
| Adar1 Capital Management, Llc | 0.96% | 3,410,190 | $16,027,893 | $10,094,162 | -$5,933,731 | -37.02% | |
| Eversept Partners, Lp | 0.99% | 3,188,514 | $14,986,016 | $9,438,001 | -$5,548,015 | -37.02% | |
| Ubs Group Ag | 0.00% | 3,120,155 | $14,664,729 | $9,235,659 | -$5,429,070 | -37.02% | |
| Jefferies Financial Group Inc. | 0.18% | 3,067,864 | $14,418,961 | $9,080,877 | -$5,338,084 | -37.02% | |
| Two Sigma Investments, Lp | 0.01% | 2,710,156 | $12,737,733 | $8,022,062 | -$4,715,671 | -37.02% | |
| Qube Research & Technologies Ltd | 0.02% | 2,249,583 | $10,573,040 | $6,658,766 | -$3,914,274 | -37.02% | |
| Geode Capital Management, Llc | 0.00% | 2,066,612 | $9,718,261 | $6,117,172 | -$3,601,089 | -37.05% | |
| Woodline Partners Lp | 0.04% | 2,000,825 | $9,403,878 | $5,922,442 | -$3,481,436 | -37.02% | |
| Dimensional Fund Advisors Lp | 0.00% | 1,930,920 | $9,071,290 | $5,715,523 | -$3,355,767 | -36.99% | |
| Susquehanna International Group, Llp | 0.01% | 1,869,615 | $8,787,191 | $5,534,060 | -$3,253,131 | -37.02% | |
| Goldman Sachs Group Inc | 0.00% | 1,459,839 | $6,861,244 | $4,321,123 | -$2,540,121 | -37.02% | |
| Gilder Gagnon Howe & Co Llc | 0.06% | 1,120,309 | $5,265,452 | $3,316,115 | -$1,949,337 | -37.02% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,102,883 | $5,183,550 | $3,264,534 | -$1,919,016 | -37.02% | |
| Patient Square Capital Lp | 0.91% | 1,085,790 | $5,103,213 | $3,213,938 | -$1,889,275 | -37.02% | |
| Jane Street Group, Llc | 0.01% | 997,510 | $4,688,297 | $2,952,630 | -$1,735,667 | -37.02% | |
| Ally Bridge Group (Ny) Llc | 4.20% | 900,000 | $4,230,000 | $2,664,000 | -$1,566,000 | -37.02% | |
| Eventide Asset Management, Llc | 0.07% | 900,000 | $4,230,000 | $2,664,000 | -$1,566,000 | -37.02% | |
| Trexquant Investment Lp | 0.03% | 898,767 | $4,224,205 | $2,660,350 | -$1,563,855 | -37.02% | |
| Vanguard Portfolio Management Llc | 0.00% | 794,755 | $3,735,349 | $2,352,475 | -$1,382,874 | -37.02% | |
| Balyasny Asset Management L.P. | 0.01% | 730,844 | $3,434,967 | $2,163,298 | -$1,271,669 | -37.02% | |
| Dv Trading Llc | 0.31% | 714,000 | $3,355,800 | $2,113,440 | -$1,242,360 | -37.02% | |
| Northern Trust Corp | 0.00% | 612,141 | $2,877,063 | $1,811,937 | -$1,065,126 | -37.02% | |
| Bnp Paribas Financial Markets | 0.00% | 606,275 | $2,849,492 | $1,794,574 | -$1,054,918 | -37.02% | |
| Ensign Peak Advisors, Inc | 0.01% | 592,473 | $2,784,623 | $1,753,720 | -$1,030,903 | -37.02% | |
| Caption Management, Llc | 0.13% | 573,224 | $2,694,153 | $1,696,743 | -$997,410 | -37.02% | |
| First Trust Advisors Lp | 0.00% | 568,562 | $2,672,241 | $1,682,944 | -$989,297 | -37.02% | |
| Informed Momentum Co Llc | 0.31% | 565,113 | $2,656,031 | $1,672,734 | -$983,297 | -37.02% | |
| Longaeva Partners L.P. | 0.12% | 550,000 | $2,585,000 | $1,628,000 | -$957,000 | -37.02% | |
| Velan Capital Investment Management Lp | 1.59% | 540,000 | $2,538,000 | $1,598,400 | -$939,600 | -37.02% | |
| Exome Asset Management Llc | 1.44% | 521,468 | $2,450,900 | $1,543,545 | -$907,355 | -37.02% | |
| Morgan Stanley | 0.00% | 520,495 | $2,446,327 | $1,540,665 | -$905,662 | -37.02% | |
| Schulhoff & Co Inc | 0.92% | 477,550 | $2,244,485 | $1,413,548 | -$830,937 | -37.02% | |
| Deutsche Bank Ag\ | 0.00% | 463,421 | $2,178,079 | $1,371,726 | -$806,353 | -37.02% |
Frequently asked questions about CTMX
Who owns the most CTMX stock?
The largest holders of CTMX 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 CYTOMX THERAPEUTICS INC (CTMX).
Is CTMX widely held by superinvestors?
Many widely followed stocks like CTMX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly CTMX 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.