Altimeter Capital Management, LP 13F: Quarter-over-Quarter Portfolio Changes
Altimeter Capital Management, LP reported a disclosed portfolio value of approximately $9.8 billion in its latest SEC Form 13F-HR filing for Q2 2026, up 72.5% quarter on quarter. Over the quarter, the fund initiated 10 new positions, bought more shares in 5 holdings, trimmed 3 holdings, and exited 3 positions.
Altimeter Capital Management, LP's top buy was a new stake in Cerebras Systems (CBRS), equal to 16.2% of the disclosed portfolio. Its top sell was Meta Platforms (META). The fund sold 30.6% of its previously reported shares, reducing the position's portfolio weight by 11.8 percentage points.
New PositionsQ2 2026
Securities disclosed for the first time in Q2 2026 that were not present in the prior 13F-HR filing.
| Company | Ticker | Initial Portfolio Weight | History |
|---|---|---|---|
| CEREBRAS SYSTEMS INC | CBRS | 16.2% | History → |
| QUALCOMM INC | QCOM | 3.5% | Holders → |
| SPACE EXPLORATION TECHNOLOGY | SPCX | 3.1% | Holders → |
| MICRON TECHNOLOGY INC | MU | 2.5% | Holders → |
| APPLIED MATLS INC | AMAT | 1.9% | Holders → |
| KLA | KLAC | 1.8% | Holders → |
| LAM RESEARCH CORP | LRCX | 1.7% | Holders → |
| ALPHABET INC | GOOGL | 0.6% | Holders → |
| SYNOPSYS INC | SNPS | 0.6% | Holders → |
| GRAB HOLDINGS LIMITED | GRABW | 0.0% | Holders → |
Top BuysQ2 2026
The fund's top buys among existing positions in Q2 2026. Ranked by portfolio-weight impact, with the percentage of additional shares shown separately.
| Company | Ticker | Portfolio Weight Change | More Shares | History |
|---|---|---|---|---|
| COREWEAVE INC | CRWV | +0.0% | +35.0% | History → |
| AMAZON COM INC | AMZN | -1.8% | +16.1% | History → |
| MICROSOFT CORP | MSFT | -2.9% | +7.1% | History → |
| TAIWAN SEMICONDUCTOR MANUFAC | TSM | -1.2% | +4.7% | History → |
| NVIDIA CORPORATION | NVDA | -9.4% | +0.8% | History → |
Top SellsQ2 2026
The fund's top sells among positions it retained in Q2 2026. Ranked by portfolio-weight impact. Full exits are listed separately.
| Company | Ticker | Portfolio Weight Change | Shares Sold | History |
|---|---|---|---|---|
| META PLATFORMS INC | META | -11.8% | 30.6% | History → |
| UBER TECHNOLOGIES INC | UBER | -4.6% | 7.5% | History → |
| ARM HOLDINGS PLC | ARM | +1.4% | 4.3% | History → |
Full ExitsQ2 2026
Positions present in the prior 13F-HR filing that no longer appear in Q2 2026.
| Company | Ticker | Last-Reported Portfolio Weight |
|---|---|---|
| AXON ENTERPRISE INC | AXON | 1.1% |
| BROADCOM | AVGO | 0.4% |
| GRAB HOLDINGS LIMITED | – | 0.0% |
Net Portfolio Value ChangeQ2 2026
- $5.7BPrior quarter
- $9.8BCurrent quarter
- +$4.1BNet delta
- +72.5%% change
Methodology & FAQ
How Altimeter Capital Management, LP Quarterly Changes Are Computed
All deltas are sourced from sequential SEC Form 13F-HR filings for Altimeter Capital Management, LP: each row joins the most recent filing against the immediately preceding quarterly filing for the same fund. Share-count changes reflect reported trading activity, while portfolio weights can also move because of market price changes. Portfolio weights are normalized to exclude listed options for comparability. A complete description, including how confidential treatment filings are handled, is documented in the Methodology.
What stocks did Altimeter Capital Management, LP buy in Q2 2026?
In Q2 2026, Altimeter Capital Management, LP initiated 10 new positions (CEREBRAS SYSTEMS INC (CBRS), QUALCOMM INC (QCOM), SPACE EXPLORATION TECHNOLOGY (SPCX), MICRON TECHNOLOGY INC (MU), APPLIED MATLS INC (AMAT), KLA (KLAC), LAM RESEARCH CORP (LRCX), ALPHABET INC (GOOGL), SYNOPSYS INC (SNPS), GRAB HOLDINGS LIMITED (GRABW)); bought more shares of COREWEAVE INC (CRWV), AMAZON COM INC (AMZN), MICROSOFT CORP (MSFT), TAIWAN SEMICONDUCTOR MANUFAC (TSM), NVIDIA CORPORATION (NVDA).
What stocks did Altimeter Capital Management, LP sell in Q2 2026?
In Q2 2026, Altimeter Capital Management, LP fully sold 3 positions (AXON ENTERPRISE INC (AXON), BROADCOM (AVGO), GRAB HOLDINGS LIMITED); reduced holdings in META PLATFORMS INC (META), UBER TECHNOLOGIES INC (UBER), ARM HOLDINGS PLC (ARM).
Which positions did Altimeter Capital Management, LP initiate in Q2 2026?
Altimeter Capital Management, LP established 10 new positions in Q2 2026: CEREBRAS SYSTEMS INC (CBRS, 16.2%), QUALCOMM INC (QCOM, 3.5%), SPACE EXPLORATION TECHNOLOGY (SPCX, 3.1%), MICRON TECHNOLOGY INC (MU, 2.5%), APPLIED MATLS INC (AMAT, 1.9%), KLA (KLAC, 1.8%), LAM RESEARCH CORP (LRCX, 1.7%), ALPHABET INC (GOOGL, 0.6%), SYNOPSYS INC (SNPS, 0.6%), GRAB HOLDINGS LIMITED (GRABW, 0.0%).
Which existing positions saw the largest allocation increases for Altimeter Capital Management, LP in Q2 2026?
Of 5 existing positions with share-count increases in Q2 2026, the largest were: COREWEAVE INC (CRWV, +0.0% weight, +35.0% shares), AMAZON COM INC (AMZN, -1.8% weight, +16.1% shares), MICROSOFT CORP (MSFT, -2.9% weight, +7.1% shares), TAIWAN SEMICONDUCTOR MANUFAC (TSM, -1.2% weight, +4.7% shares), NVIDIA CORPORATION (NVDA, -9.4% weight, +0.8% shares).
Which positions did Altimeter Capital Management, LP fully exit in Q2 2026?
Altimeter Capital Management, LP fully exited 3 positions in Q2 2026: AXON ENTERPRISE INC (AXON, last-reported weight 1.1%), BROADCOM (AVGO, last-reported weight 0.4%), GRAB HOLDINGS LIMITED (last-reported weight 0.0%).
Which existing positions saw the largest allocation reductions for Altimeter Capital Management, LP in Q2 2026?
Of 3 existing positions with share-count reductions in Q2 2026, the largest were: META PLATFORMS INC (META, -11.8% weight, -30.6% shares), UBER TECHNOLOGIES INC (UBER, -4.6% weight, -7.5% shares), ARM HOLDINGS PLC (ARM, +1.4% weight, -4.3% shares).
Do quarter-over-quarter 13F allocation changes constitute explicit trading signals?
No. Quarter-over-quarter changes reflect a combination of active trading and market price movement. A weight increase can result from price appreciation alone, without the manager adding shares. Share-count delta is the cleaner indicator of explicit trading activity. All deltas on this page are sourced from sequential SEC Form 13F-HR filings.