ALT · Altimmune, Inc. · Holdings
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Superinvestors Holding ALT
All superinvestors →Holder Concentration
Across 211 13F filersWho Holds ALT
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 210 filers, like-for-like change +116.4%; actively managed books +185.2%; index-like books +53.4%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 39.3% | 109 | +103.9% |
| Exempt adviser | 4.8% | 3 | +77.0% |
| Adviser | 13.4% | 8 | +2716.4% |
| Bank | 11.3% | 12 | +61.1% |
| Insurer | 0.0% | 1 | +61.5% |
| Broker-dealer | 0.1% | 1 | +10.4% |
| Benefit plan | 0.0% | 1 | -61.6% |
| Non-US | 0.4% | 4 | +6.5% |
| Holding company | 16.4% | 8 | +54.5% |
| Unknown | 14.1% | 63 | +154.2% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 37.0% | 23 | +53.4% |
| Systematic-like | 12.6% | 25 | +29.9% |
| Concentrated | 5.5% | 22 | +403.4% |
| Diversified active | 44.9% | 140 | +297.3% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 48.0% | 117 | +92.8% |
| Medium turnover | 18.3% | 40 | +726.8% |
| High turnover | 20.5% | 39 | +86.5% |
| Unknown | 13.2% | 14 | +62.8% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 16.4% | 31 | +92.4% |
| Medium horizon | 35.9% | 36 | +234.3% |
| Long horizon | 31.9% | 125 | +61.3% |
| Unknown | 15.8% | 18 | +120.4% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 4.0% | 35 | +346.5% |
| $1B to $10B | 25.4% | 64 | +1713.7% |
| $10B to $100B | 18.3% | 56 | +181.7% |
| $100B or more | 52.3% | 55 | +39.8% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.4% | 51 | +0.1% |
| Pooled investment vehicles | 21.4% | 30 | +219.7% |
| Registered funds and BDCs | 15.1% | 12 | +40.2% |
| Pension and profit sharing plans | 0.0% | 2 | +26063.2% |
| Insurance companies | 0.1% | 3 | +68.1% |
| Governments and sovereign funds | 0.2% | 1 | +98.9% |
| Other investment advisers | 0.1% | 4 | +32.8% |
| Diversified | 1.0% | 6 | +589.1% |
| Unknown | 60.7% | 101 | +125.3% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 20.5% | 28 | +115.6% |
| Private equity funds | 2.3% | 9 | +2160.9% |
| Venture capital funds | 4.3% | 2 | +50004138.5% |
| Real estate funds | 0.0% | 2 | -14.0% |
| Securitized asset funds | 0.0% | 1 | 0.0% |
| Other private funds | 0.9% | 10 | -4.3% |
| Mixed private funds | 0.1% | 2 | +78.5% |
| Private funds, type not stated | 0.3% | 4 | +726.7% |
| No private funds | 15.7% | 54 | +38.3% |
| Unknown | 55.9% | 98 | +130.8% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 93.6% | 184 | +124.2% |
| Outside the US | 6.4% | 26 | +43.2% |
| Unknown | 0.0% | 0 | — |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 3 holders with no observed 2026-06-30 13F.
Conviction and Crowding
210 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 64.8% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies ALT's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | LBRX Lb Pharmaceuticals Inc | 6 |
| 2 | ZLAB Zai Lab Ltd | 5 |
| 3 | IPSC Century Therapeutics, Inc. | 5 |
| 4 | KLRA Kailera Therapeutics, Inc. | 5 |
| 5 | JANX Janux Therapeutics, Inc. | 4 |
| 6 | XNCR Xencor Inc | 4 |
| 7 | SLN Silence Therapeutics plc | 4 |
| 8 | PMN ProMIS Neurosciences Inc. | 3 |
| 9 | LENZ LENZ Therapeutics, Inc. | 3 |
| 10 | AMLX Amylyx Pharmaceuticals, Inc. | 5 |
Shareholder Targets
13F filers that own its peers but not ALT, quarter ended Jun 30, 2026Found through its holder-overlap peers: LBRX, ZLAB, IPSC, KLRA, JANX, XNCR, SLN, PMN, LENZ, AMLX, CAPR, JATT, NAMS, VOR, COAG, NGNE, AGMB, DMRA, OLMA, OCUL. 492 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | Bain Capital Life Sciences Investors, LLC Unknown, Concentrated | $777,891,857 4 held | KLRA, NAMS, OLMA |
| 2 | Frazier Life Sciences Management, L.P. Registered adviser, Concentrated | $730,936,000 4 held | NAMS, VOR, ZLAB |
| 3 | Bain Capital Investors LLC Unknown, Concentrated | $578,410,449 1 held | KLRA |
| 4 | RTW INVESTMENTS, LP Registered adviser, Diversified active | $541,610,662 6 held | KLRA, ZLAB, XNCR |
| 5 | FCPM III SERVICES B.V. Unknown, Concentrated | $427,028,959 3 held | NAMS, VOR, DMRA |
| 6 | Capital World Investors Adviser, Diversified active | $414,493,576 1 held | NAMS |
| 7 | Jupiter Topco LLC Unknown, Diversified active | $376,732,472 12 held | AMLX, OLMA, NAMS |
| 8 | Avoro Capital Advisors LLC Registered adviser, Concentrated | $292,249,389 3 held | OCUL, DMRA, COAG |
| 9 | Siren, L.L.C. Unknown, Diversified active | $277,888,501 7 held | COAG, OLMA, KLRA |
| 10 | Venrock Adviser, LLC Registered adviser, Concentrated | $272,638,711 4 held | OCUL, DMRA, VOR |
Fund Ownership of ALT by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 17.04% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 2.89% | 5,614,794 |
| Index ETFs | 14.15% | 27,533,367 |
| Active ETFs | 0.58% | 1,134,501 |
| Active funds | 5.04% | 9,804,858 |
| Unclassified | 0.00% | 1,116 |
| All registered funds | 22.67% | 44,088,636 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $61,971,257 | 13.29% | 20,385,284 | Shares | 2026-08-07 | |
| Mid Deep Track Capital, LP Adviser | $58,520,000 | 12.55% | 19,250,000 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP Bank | $36,779,561 | 7.89% | 12,098,540 | Shares | 2026-09-22 | |
| Mid TCG Crossover Management, LLC | $30,400,000 | 6.52% | 10,000,000 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $24,860,366 | 5.33% | 8,177,752 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $22,284,005 | 4.78% | 7,330,265 | Shares | 2026-08-13 | |
| Large MARSHALL WACE, LLP Exempt adviser | $20,796,806 | 4.46% | 6,841,055 | Shares | 2026-08-13 | |
| Large VIKING GLOBAL INVESTORS LP Registered adviser | $20,368,000 | 4.37% | 6,700,000 | Shares | 2026-08-14 | |
| Large RA CAPITAL MANAGEMENT, L.P. Registered adviser | $19,760,000 | 4.24% | 6,500,000 | Shares | 2026-08-14 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $15,234,394 | 3.27% | 5,011,314 | Shares | 2026-08-12 | |
| Large Woodline Partners LP Registered adviser | $10,336,948 | 2.22% | 3,400,312 | Shares | 2026-08-14 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $10,059,730 | 2.16% | 3,309,122 | Shares | 2026-08-14 | |
| Small Trails Edge Capital Partners, LP | $8,086,400 | 1.73% | 2,660,000 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $7,312,275 | 1.57% | 2,405,354 | Shares | 2026-08-11 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $7,238,671 | 1.55% | 2,381,142 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $6,731,927 | 1.44% | 2,214,450 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $5,469,872 | 1.17% | 1,799,300 | Call | 2026-08-14 | |
| Small GREAT POINT PARTNERS LLC Registered adviser | $5,293,345 | 1.14% | 1,741,232 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $4,861,645 | 1.04% | 1,599,226 | Shares | 2026-08-13 | |
| Mid Weiss Asset Management LP Registered adviser | $4,653,641 | 1.00% | 1,530,803 | Shares | 2026-08-14 | |
| Mid Nantahala Capital Management, LLC Registered adviser | $4,560,000 | 0.98% | 1,500,000 | Shares | 2026-08-19 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $3,930,723 | 0.84% | 1,293,001 | Shares | 2026-08-13 | |
| Mid Cormorant Asset Management, LP Registered adviser | $3,800,000 | 0.81% | 1,250,000 | Shares | 2026-08-14 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $3,711,682 | 0.80% | 1,220,949 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $2,990,018 | 0.64% | 983,559 | Shares | 2026-09-02 | |
| Mega UBS Group AG Bank | $2,633,808 | 0.56% | 866,385 | Shares | 2026-08-13 | |
| Mega MORGAN STANLEY Holding company | $2,305,640 | 0.49% | 758,435 | Shares | 2026-08-13 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $2,304,072 | 0.49% | 757,919 | Shares | 2026-08-14 | |
| Mid Ghisallo Capital Management LLC Registered adviser | $2,280,000 | 0.49% | 750,000 | Shares | 2026-08-14 | |
| Mega FMR LLC Holding company | $2,276,880 | 0.49% | 748,974 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $2,222,476 | 0.48% | 731,078 | Shares | 2026-08-14 | |
| Mid Hennion & Walsh Asset Management, Inc. | $2,130,691 | 0.46% | 744,997 | Shares | 2026-10-13 | |
| Mega Bank of New York Mellon Corp Bank | $2,096,726 | 0.45% | 689,713 | Shares | 2026-08-06 | |
| Mid TANG CAPITAL MANAGEMENT LLC | $2,024,706 | 0.43% | 666,022 | Shares | 2026-08-14 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $1,943,884 | 0.42% | 639,436 | Shares | 2026-08-11 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $1,918,240 | 0.41% | 631,000 | Call | 2026-09-02 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $1,898,476 | 0.41% | 624,499 | Shares | 2026-08-14 | |
| Large Point72 Asset Management, L.P. Registered adviser | $1,480,127 | 0.32% | 486,884 | Shares | 2026-08-14 | |
| Mid Rock Springs Capital Management LP Registered adviser | $1,433,253 | 0.31% | 471,465 | Shares | 2026-08-14 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $1,277,710 | 0.27% | 420,300 | Shares | 2026-08-14 | |
| Small Beirne Wealth Consulting Services, LLC | $1,206,513 | 0.26% | 421,858 | Shares | 2026-10-19 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $1,128,375 | 0.24% | 371,176 | Shares | 2026-08-13 | |
| Mega BARCLAYS PLC Bank | $1,068,824 | 0.23% | 351,587 | Shares | 2026-08-14 | |
| Mega Invesco Ltd. Adviser | $1,011,079 | 0.22% | 332,592 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $990,128 | 0.21% | 325,700 | Put | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $941,202 | 0.20% | 309,606 | Shares | 2026-08-12 | |
| Large Janney Montgomery Scott LLC Adviser | $919,934 | 0.20% | 302,610 | Shares | 2026-08-05 | |
| Large LMR Partners LLP Exempt adviser | $912,000 | 0.20% | 300,000 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $893,601 | 0.19% | 293,948 | Shares | 2026-08-03 | |
| Large Steward Partners Investment Advisory, LLC Registered adviser | $810,679 | 0.17% | 266,671 | Shares | 2026-08-13 | |
| Mid MANGROVE PARTNERS IM, LLC Registered adviser | $727,411 | 0.16% | 239,280 | Shares | 2026-08-14 | |
| Large Baird Financial Group, Inc. | $722,066 | 0.15% | 237,522 | Shares | 2026-08-12 | |
| Small BROWN WEALTH MANAGEMENT, LLC Registered adviser | $717,853 | 0.15% | 236,136 | Shares | 2026-07-20 | |
| Mega JANE STREET GROUP, LLC | $691,296 | 0.15% | 227,400 | Call | 2026-08-14 | |
| Large Rafferty Asset Management, LLC Registered adviser | $684,182 | 0.15% | 225,060 | Shares | 2026-08-14 | |
| Mega Creative Planning Registered adviser | $663,573 | 0.14% | 218,281 | Shares | 2026-08-13 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $660,986 | 0.14% | 217,430 | Shares | 2026-08-14 | |
| Large COMMONWEALTH EQUITY SERVICES, LLC Registered adviser | $652,304 | 0.14% | 214,574 | Shares | 2026-07-29 | |
| Large Squarepoint Ops LLC Registered adviser | $615,235 | 0.13% | 202,380 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $612,979 | 0.13% | 201,638 | Shares | 2026-08-14 | |
| Large ALPS ADVISORS INC Registered adviser | $600,016 | 0.13% | 197,374 | Shares | 2026-07-29 | |
| Mega DEUTSCHE BANK AG\ Non-US | $592,841 | 0.13% | 195,014 | Shares | 2026-08-07 | |
| Mega STIFEL FINANCIAL CORP | $584,798 | 0.13% | 192,368 | Shares | 2026-08-12 | |
| Mid Jump Financial, LLC | $577,600 | 0.12% | 190,000 | Shares | 2026-08-13 | |
| Large Man Group plc | $528,570 | 0.11% | 173,872 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $502,785 | 0.11% | 165,390 | Shares | 2026-08-14 | |
| Small Knoll Capital Management, LLC | $486,400 | 0.10% | 160,000 | Shares | 2026-09-10 | |
| Small Birchview Capital, LP | $464,150 | 0.10% | 152,681 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $428,184 | 0.09% | 140,850 | Shares | 2026-08-14 | |
| Large Brevan Howard Capital Management LP Exempt adviser | $397,574 | 0.09% | 130,781 | Shares | 2026-08-14 | |
| Mid XTX Topco Ltd | $389,387 | 0.08% | 128,088 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $389,120 | 0.08% | 128,000 | Put | 2026-09-02 | |
| Small Virtus Investment Advisers, LLC Registered adviser | $381,103 | 0.08% | 125,363 | Shares | 2026-08-11 | |
| Small WEALTH EFFECTS LLC Registered adviser | $372,856 | 0.08% | 122,650 | Shares | 2026-08-06 | |
| Mega LPL Financial LLC Broker-dealer | $370,734 | 0.08% | 121,952 | Shares | 2026-08-07 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $357,752 | 0.08% | 117,682 | Shares | 2026-08-14 | |
| Large MetLife Investment Management, LLC Registered adviser | $355,242 | 0.08% | 116,856 | Shares | 2026-08-14 | |
| Mid PROFUND ADVISORS LLC Registered adviser | $345,337 | 0.07% | 113,598 | Shares | 2026-08-11 | |
| Large Jefferies Financial Group Inc. Holding company | $334,400 | 0.07% | 110,000 | Shares | 2026-08-17 | |
| Mega JPMORGAN CHASE & CO Bank | $324,137 | 0.07% | 106,625 | Shares | 2026-08-12 | |
| Large SILVERCREST ASSET MANAGEMENT GROUP LLC Registered adviser | $314,640 | 0.07% | 103,500 | Shares | 2026-08-14 | |
| Mid Susquehanna Portfolio Strategies, LLC | $314,256 | 0.07% | 103,374 | Shares | 2026-08-14 | |
| Mid ADAR1 Capital Management, LLC Registered adviser | $312,581 | 0.07% | 102,823 | Shares | 2026-08-14 | |
| Large Mariner, LLC Registered adviser | $307,413 | 0.07% | 101,123 | Shares | 2026-08-13 | |
| Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. Adviser | $304,000 | 0.07% | 100,000 | Shares | 2026-08-14 | |
| Small Summit Financial Wealth Advisors, LLC Registered adviser | $295,403 | 0.06% | 103,288 | Shares | 2026-10-15 | |
| Mega CANADA PENSION PLAN INVESTMENT BOARD Non-US | $265,392 | 0.06% | 87,300 | Shares | 2026-08-14 | |
| Large Grantham, Mayo, Van Otterloo & Co. LLC Adviser | $254,864 | 0.05% | 83,837 | Shares | 2026-08-13 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $228,136 | 0.05% | 75,045 | Shares | 2026-08-13 | |
| Mid KINGSWOOD WEALTH ADVISORS, LLC Registered adviser | $226,480 | 0.05% | 74,500 | Shares | 2026-07-27 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $217,664 | 0.05% | 71,600 | Shares | 2026-08-13 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $208,455 | 0.04% | 68,571 | Shares | 2026-08-14 | |
| Large IEQ CAPITAL, LLC Registered adviser | $203,540 | 0.04% | 66,954 | Shares | 2026-08-11 | |
| Mega HSBC HOLDINGS PLC | $195,958 | 0.04% | 64,460 | Shares | 2026-08-14 | |
| Mid Leonteq Securities AG | $194,560 | 0.04% | 64,000 | Shares | 2026-07-27 | |
| Large Police & Firemen's Retirement System of New Jersey | $178,220 | 0.04% | 58,625 | Shares | 2026-07-23 | |
| Small AXQ CAPITAL, LP Registered adviser | $172,702 | 0.04% | 56,810 | Shares | 2026-08-06 | |
| Mega ENVESTNET ASSET MANAGEMENT INC Registered adviser | $172,498 | 0.04% | 56,743 | Shares | 2026-09-23 | |
| Large Corient Private Wealth LLC Registered adviser | $164,847 | 0.04% | 54,226 | Shares | 2026-08-27 | |
| Large MERCER GLOBAL ADVISORS INC /ADV Registered adviser | $161,469 | 0.03% | 53,115 | Shares | 2026-08-19 |
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