Big-fund tracker · Form 13F
Altimeter Capital Management’s 13F: what it reported owning at Jun 30, 2026
Altimeter Capital Management’s stock holdings as reported to the SEC for the quarter ended Jun 30, 2026, compared with the quarter before: top positions, new positions, exits and the biggest changes in shares.
The short answer
Altimeter Capital Management’s 13F for the quarter ended Jun 30, 2026 lists 20 stock positions with a combined reported value of $9.83B, compared with 13 stock positions worth $5.70B in its filing for the quarter ended Mar 31, 2026. The three largest positions were Nvidia, Cerebras Systems Inc and Meta, together 43.2% of that value. Against the previous quarter, 10 positions are new, 3 positions are gone, the share count rose in 5, fell in 3 and did not change in 2.
What a 13F shows, and what it doesn't
A 13F is a quarterly report that large investment managers file with the SEC. It is a useful record and a limited one. Read this list before reading the tables.
- It is late. The filing is due 45 days after the quarter ends. This one covers the quarter ended Jun 30, 2026 and was filed on Aug 14, 2026, 45 days later. Whatever the filer did since quarter end is not in it.
- It is a snapshot of one day. A 13F shows what the filer held on the last day of the quarter. A stock bought and sold inside the quarter never appears, and a position built up over three months looks like a single change.
- It lists long positions in US-listed stocks and similar securities only. Short positions, cash, Treasury bills, most bonds, most foreign shares and private companies are left out, so the list is not the filer’s whole portfolio.
- Reported value is a quarter-end price times shares. When a value changes between two filings, part of the change is the stock price moving. The change in shares is the better sign of buying or selling, and even that does not say why.
- Some details can be held back. Filers may ask the SEC to keep a position confidential for a time. This filing says no positions were left out on that basis.
- The filing can cover more than one entity. This filing lists no other included managers.
- It is not advice, and it is not a model portfolio. A manager’s holdings reflect its own goals, costs, time frame and risk limits, and the positions may already have changed. Nothing here says what anyone else should own.
Positions reported at Jun 30, 2026
| # | Company | Shares, Jun 30, 2026 | Shares, Mar 31, 2026 | Change in shares | Change | Reported value, Jun 30, 2026 | Share of stock positions |
|---|---|---|---|---|---|---|---|
| 1 | NvidiaNVDA | 9,413,589 | 9,336,039 | +77,550 | +0.8% | $1.88B | 19.2% |
| 2 | Cerebras Systems Inc | 7,225,037 | – | New | – | $1.60B | 16.2% |
| 3 | MetaMETA | 1,354,990 | 1,953,373 | −598,383 | −30.6% | $763.3M | 7.8% |
| 4 | Taiwan Semiconductor Mfg Ltd | 1,429,355 | 1,365,675 | +63,680 | +4.7% | $682.6M | 6.9% |
| 5 | Coreweave Inc | 6,073,695 | 4,499,075 | +1,574,620 | +35.0% | $604.6M | 6.2% |
| 6 | Arm Holdings Plc | 1,641,972 | 1,715,440 | −73,468 | −4.3% | $582.2M | 5.9% |
| 7 | AmazonAMZN | 2,425,351 | 2,089,558 | +335,793 | +16.1% | $578.1M | 5.9% |
| 8 | UberUBER | 7,372,440 | 7,971,772 | −599,332 | −7.5% | $532.0M | 5.4% |
| 9 | Snowflake Inc | 1,926,250 | 1,926,250 | No change | – | $490.2M | 5.0% |
| 10 | MicrosoftMSFT | 1,268,082 | 1,183,632 | +84,450 | +7.1% | $473.0M | 4.8% |
| 11 | QualcommQCOM | 1,882,490 | – | New | – | $347.9M | 3.5% |
| 12 | Space Exploration Techn Corp | 1,776,485 | – | New | – | $303.5M | 3.1% |
| 13 | MicronMU | 209,520 | – | New | – | $241.8M | 2.5% |
| 14 | Applied MaterialsAMAT | 261,950 | – | New | – | $189.4M | 1.9% |
| 15 | KLAKLAC | 578,230 | – | New | – | $174.5M | 1.8% |
| 16 | Lam ResearchLRCX | 394,080 | – | New | – | $170.8M | 1.7% |
| 17 | Robinhood MarketsHOOD | 899,691 | 899,691 | No change | – | $90.2M | 0.9% |
| 18 | AlphabetGOOGL | 175,180 | – | New | – | $62.6M | 0.6% |
| 19 | SynopsysSNPS | 140,343 | – | New | – | $62.6M | 0.6% |
| 20 | Grab Holdings Limited | 3,502,000 | – | New | – | $0.2M | 0.0% |
One company can have several lines in a 13F (the filer splits a position by the entity that holds it). The lines for the same stock and share class are added together here. Reported value is the filer’s own figure for the position at quarter end. Click any number to open the filing.
What changed from Mar 31, 2026 to Jun 30, 2026
These tables compare this filing with the one for the quarter ended Mar 31, 2026 (filed May 15, 2026). Changes are in shares, from the filings.
| Company | Shares, Jun 30, 2026 | Reported value, Jun 30, 2026 |
|---|---|---|
| Cerebras Systems Inc | 7,225,037 | $1.60B |
| QualcommQCOM | 1,882,490 | $347.9M |
| Space Exploration Techn Corp | 1,776,485 | $303.5M |
| MicronMU | 209,520 | $241.8M |
| Applied MaterialsAMAT | 261,950 | $189.4M |
| KLAKLAC | 578,230 | $174.5M |
| Lam ResearchLRCX | 394,080 | $170.8M |
| AlphabetGOOGL | 175,180 | $62.6M |
| SynopsysSNPS | 140,343 | $62.6M |
| Grab Holdings Limited | 3,502,000 | $0.2M |
| Company | Shares, Mar 31, 2026 | Reported value, Mar 31, 2026 |
|---|---|---|
| Axon EnterpriseAXON | 148,986 | $63.3M |
| BroadcomAVGO | 67,094 | $20.8M |
| Grab Holdings Limited | 3,502,000 | $0.3M |
| Company | Shares, Mar 31, 2026 | Shares, Jun 30, 2026 | Change in shares | Change | Reported value, Jun 30, 2026 |
|---|---|---|---|---|---|
| Coreweave Inc | 4,499,075 | 6,073,695 | +1,574,620 | +35.0% | $604.6M |
| AmazonAMZN | 2,089,558 | 2,425,351 | +335,793 | +16.1% | $578.1M |
| MicrosoftMSFT | 1,183,632 | 1,268,082 | +84,450 | +7.1% | $473.0M |
| Taiwan Semiconductor Mfg Ltd | 1,365,675 | 1,429,355 | +63,680 | +4.7% | $682.6M |
| NvidiaNVDA | 9,336,039 | 9,413,589 | +77,550 | +0.8% | $1.88B |
| Company | Shares, Mar 31, 2026 | Shares, Jun 30, 2026 | Change in shares | Change | Reported value, Jun 30, 2026 |
|---|---|---|---|---|---|
| MetaMETA | 1,953,373 | 1,354,990 | −598,383 | −30.6% | $763.3M |
| UberUBER | 7,971,772 | 7,372,440 | −599,332 | −7.5% | $532.0M |
| Arm Holdings Plc | 1,715,440 | 1,641,972 | −73,468 | −4.3% | $582.2M |
Ranked by the percent change in the number of shares, so a small position can top a list. 2 positions had the same number of shares in both filings. A position that is absent from a filing may have been sold in full, or may have been moved to a part of the filer that is reported elsewhere; the filing does not say.
The companies with a Ticker Sage file
13 lines of this 13F are companies Ticker Sage covers, 56.7% of the reported value of the stock positions. Each has its own file built from its 10-K and 10-Q filings.
| Company | Shares, Jun 30, 2026 | Reported value, Jun 30, 2026 |
|---|---|---|
| Nvidia | 9,413,589 | $1.88B |
| Meta | 1,354,990 | $763.3M |
| Amazon | 2,425,351 | $578.1M |
| Uber | 7,372,440 | $532.0M |
| Microsoft | 1,268,082 | $473.0M |
| Qualcomm | 1,882,490 | $347.9M |
| Micron | 209,520 | $241.8M |
| Applied Materials | 261,950 | $189.4M |
| KLA | 578,230 | $174.5M |
| Lam Research | 394,080 | $170.8M |
| Robinhood Markets | 899,691 | $90.2M |
| Alphabet | 175,180 | $62.6M |
| Synopsys | 140,343 | $62.6M |
Source filings
- Latest: Form 13F-HR for the quarter ended Jun 30, 2026, filed Aug 14, 2026, accession 0001541617-26-000008: information table · cover page · filing index
- Prior: Form 13F-HR for the quarter ended Mar 31, 2026, filed May 15, 2026, accession 0001541617-26-000006: information table · cover page · filing index
Both filings are on SEC EDGAR under CIK 0001541617. The next 13F covers the quarter ending Sep 30, 2026 and is due by Nov 14, 2026.
All tracked 13F filers · 13F filings explained · Insider buying · Methodology & Disclosures
Disclosures
- Editor holdings
- The editor holds no position in any company named on this page. As of Nov 11, 2026.
- Compensation
- Nobody paid for this page. No affiliate links on this page.
- Sources
- The Form 13F-HR filings above, linked next to each number.
- Last updated
- Nov 11, 2026
General education, the same for every reader. This page reports what one filer disclosed. It is not a recommendation to buy, sell or hold any security, and it doesn’t consider your situation.