ANAPTYSBIO INC (ANAB) Top Institutional Shareholders
ANAPTYSBIO INC (ANAB) 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 $1.54B in ANAB holdings during the latest filing period.
Ecor1 Capital, Llc is currently the largest disclosed institutional shareholder of ANAB tracked by InsiderSet, reporting ownership valued at approximately $437.03M 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 $447.35M, representing an estimated gain of +2.36% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 59% of the total disclosed ANAB value among the investors covered in this analysis. Major shareholders include Ecor1 Capital, Llc, Blackrock, Inc., Tang Capital Management Llc, and several other long-term asset managers with concentrated positions in ANAPTYSBIO INC (ANAB).
This page ranks the largest institutional ANAB 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
201
Total Reported Value
$1.54B
Largest Holder
Ecor1 Capital, Llc
Largest Position
$437.03M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
172
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Ecor1 Capital, Llc | 18.68% | 7,880,094 | $437,030,013 | $447,352,936 | +$10,322,923 | +2.36% | |
| Blackrock, Inc. | 0.00% | 1,681,380 | $93,249,334 | $95,451,943 | +$2,202,609 | +2.36% | |
| Tang Capital Management Llc | 3.75% | 1,330,879 | $73,810,549 | $75,554,001 | +$1,743,452 | +2.36% | |
| Morgan Stanley | 0.00% | 993,905 | $55,121,984 | $56,423,987 | +$1,302,003 | +2.36% | |
| State Street Corp | 0.00% | 992,445 | $55,041,000 | $56,341,103 | +$1,300,103 | +2.36% | |
| Affinity Asset Advisors, Llc | 3.06% | 940,000 | $52,132,400 | $53,363,800 | +$1,231,400 | +2.36% | |
| Vanguard Capital Management Llc | 0.00% | 853,151 | $47,315,754 | $48,433,382 | +$1,117,628 | +2.36% | |
| Palo Alto Investors Lp | 5.41% | 638,161 | $35,392,409 | $36,228,400 | +$835,991 | +2.36% | |
| 683 Capital Management, Llc | 3.22% | 625,000 | $34,662,500 | $35,481,250 | +$818,750 | +2.36% | |
| D. E. Shaw & Co., Inc. | 0.03% | 579,296 | $32,127,756 | $32,886,634 | +$758,878 | +2.36% | |
| First Light Asset Management, Llc | 2.81% | 565,431 | $31,358,803 | $32,099,518 | +$740,715 | +2.36% | |
| Sanofi | 9.04% | 821,917 | $30,384,545 | $46,660,228 | +$16,275,683 | +53.57% | |
| Geode Capital Management, Llc | 0.00% | 520,241 | $28,858,610 | $29,534,082 | +$675,472 | +2.34% | |
| Vanguard Portfolio Management Llc | 0.00% | 519,870 | $28,831,990 | $29,513,020 | +$681,030 | +2.36% | |
| Bank Of America Corp | 0.00% | 501,086 | $27,790,230 | $28,446,652 | +$656,422 | +2.36% | |
| Arrowstreet Capital, Limited Partnership | 0.01% | 492,120 | $27,292,975 | $27,937,652 | +$644,677 | +2.36% | |
| Millennium Management Llc | 0.02% | 475,572 | $26,375,223 | $26,998,222 | +$622,999 | +2.36% | |
| Fmr Llc | 0.00% | 472,704 | $26,216,167 | $26,835,406 | +$619,239 | +2.36% | |
| Two Sigma Investments, Lp | 0.02% | 465,083 | $25,793,503 | $26,402,762 | +$609,259 | +2.36% | |
| Federated Hermes, Inc. | 0.03% | 364,121 | $20,194,150 | $20,671,149 | +$476,999 | +2.36% | |
| Woodline Partners Lp | 0.07% | 344,256 | $19,092,438 | $19,543,413 | +$450,975 | +2.36% | |
| Goldman Sachs Group Inc | 0.00% | 332,743 | $18,453,926 | $18,889,820 | +$435,894 | +2.36% | |
| Synergy Asset Management, Llc | 1.87% | 317,106 | $17,586,699 | $18,002,108 | +$415,409 | +2.36% | |
| Nuveen, Llc | 0.00% | 316,065 | $17,528,965 | $17,943,010 | +$414,045 | +2.36% | |
| Squarepoint Ops Llc | 0.03% | 267,703 | $14,846,808 | $15,197,499 | +$350,691 | +2.36% | |
| Qube Research & Technologies Ltd | 0.02% | 254,736 | $14,127,659 | $14,461,363 | +$333,704 | +2.36% | |
| Sofinnova Investments, Inc. | 0.69% | 248,253 | $13,768,111 | $14,093,323 | +$325,212 | +2.36% | |
| Apis Capital Advisors, Llc | 2.04% | 238,000 | $13,199,480 | $13,511,260 | +$311,780 | +2.36% | |
| Citadel Advisors Llc | 0.01% | 233,450 | $12,947,137 | $13,252,957 | +$305,820 | +2.36% | |
| Charles Schwab Investment Management Inc | 0.00% | 192,687 | $10,686,421 | $10,938,841 | +$252,420 | +2.36% | |
| Northern Trust Corp | 0.00% | 183,519 | $10,177,964 | $10,418,374 | +$240,410 | +2.36% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.02% | 158,562 | $8,793,849 | $9,001,565 | +$207,716 | +2.36% | |
| Vanguard Fiduciary Trust Co | 0.00% | 135,082 | $7,491,648 | $7,668,605 | +$176,957 | +2.36% | |
| Hsbc Holdings Plc | 0.00% | 125,717 | $7,136,954 | $7,136,954 | +$0 | +0.00% | |
| Ensign Peak Advisors, Inc | 0.01% | 125,633 | $6,967,606 | $7,132,185 | +$164,579 | +2.36% | |
| Invesco Ltd. | 0.00% | 121,103 | $6,716,372 | $6,875,017 | +$158,645 | +2.36% | |
| Victory Capital Management Inc | 0.00% | 108,203 | $6,000,938 | $6,142,684 | +$141,746 | +2.36% | |
| Bnp Paribas Financial Markets | 0.00% | 96,971 | $5,378,012 | $5,505,044 | +$127,032 | +2.36% | |
| Highmark Wealth Management Llc | 2.12% | 94,050 | $5,216,013 | $5,339,219 | +$123,206 | +2.36% | |
| Nomura Asset Management International Inc. | 0.01% | 93,732 | $5,198,000 | $5,321,166 | +$123,166 | +2.37% | |
| Renaissance Technologies LLC | Jim Simons | 0.01% | 90,900 | $5,041,314 | $5,160,393 | +$119,079 | +2.36% |
| Jane Street Group, Llc | 0.01% | 86,038 | $4,771,667 | $4,884,377 | +$112,710 | +2.36% | |
| Trexquant Investment Lp | 0.03% | 85,167 | $4,723,362 | $4,834,931 | +$111,569 | +2.36% | |
| Ubs Group Ag | 0.00% | 79,670 | $4,418,499 | $4,522,866 | +$104,367 | +2.36% | |
| Voloridge Investment Management, Llc | 0.02% | 78,952 | $4,378,678 | $4,482,105 | +$103,427 | +2.36% | |
| Citigroup Inc | 0.00% | 73,406 | $4,071,097 | $4,167,259 | +$96,162 | +2.36% | |
| Marshall Wace, Llp | 0.00% | 68,047 | $3,773,886 | $3,863,028 | +$89,142 | +2.36% | |
| Granahan Investment Management, Llc | 0.18% | 66,182 | $3,670,454 | $3,757,152 | +$86,698 | +2.36% | |
| Franklin Resources Inc | 0.00% | 65,820 | $3,650,377 | $3,736,601 | +$86,224 | +2.36% | |
| Prudential Financial Inc | 0.00% | 64,050 | $3,552,213 | $3,636,119 | +$83,906 | +2.36% |
Frequently asked questions about ANAB
Who owns the most ANAB stock?
The largest holders of ANAB 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 ANAPTYSBIO INC (ANAB).
Is ANAB widely held by superinvestors?
Many widely followed stocks like ANAB appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ANAB 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.