Key points
- 16 tracked funds disclosed $4.64B of Cerebras (CBRS) common stock as of June 30, 2026.
- Altimeter at $1.60B and Coatue at $1.55B account for 68% of the total.
- Altimeter's stake is 16% of its portfolio, its second largest position after Nvidia.
- Separately, five insiders filed Form 144 notices in mid-August to sell about $49M of stock, about 0.2% of shares outstanding.
Sixteen funds we track filed a Cerebras Systems (CBRS) stake this quarter.
Who reported what
Altimeter Capital and Coatue Management hold most of the money here. Altimeter reported 7,225,037 shares worth $1.60 billion. Coatue reported 7,011,028 shares worth $1.55 billion. Together that's $3.15 billion, or 68% of the full $4.64 billion the sixteen funds disclosed.
| Fund | Shares | Value | Share of portfolio |
|---|---|---|---|
| Altimeter Capital | 7,225,037 | $1.60B | 16.2% |
| Coatue Management | 7,011,028 | $1.55B | 3.2% |
| Citadel Advisors | 3,114,670 | $688.3M | 0.1% |
| Tiger Global Management | 2,999,000 | $662.8M | 2.8% |
| ARK Investment Management | 764,613 | $169.0M | 1.1% |
| Dragoneer Investment Group | 400,000 | $88.4M | 3.1% |
| Millennium Management | 279,817 | $61.8M | less than 0.1% |
| D. E. Shaw | 220,350 | $48.7M | less than 0.1% |
| Suvretta Capital | 171,900 | $38.0M | 0.7% |
Seven smaller funds are further down the list, each holding 150,000 shares or fewer. Soros Fund Management, D1 Capital and Greenoaks each hold about $33.1 million. Point72 holds $28.7 million, Whale Rock $11.2 million, Woodline $10.2 million and Situational Awareness $2.2 million.
What the filings actually show
For Altimeter, Cerebras is a real position, not a footnote. It's 16.2% of the fund's own portfolio, the second-biggest holding behind $1.88 billion of Nvidia, out of 20 positions total. Nine of those twenty were brand new last quarter. They include Qualcomm and Micron. Cerebras arrived alongside a broader move into chipmakers.
Coatue's stake looks stranger on paper. It's split across eight separate rows in the filing, from 11,680 shares up to 6,129,242, adding up to that same 7,011,028. A large manager reports one position more than once when it sits across different funds or accounts under one roof, and Coatue does this often enough that it stopped surprising me a while ago. The same filing shows the fund opening $1.69 billion of Intel and $3.17 billion of SpaceX last quarter, too.
Citadel Advisors' $688.3 million includes options too, which makes the fund's real equity exposure to Cerebras smaller than that headline number suggests.
Where the stock has traded since
CBRS has moved a lot since these numbers were locked in. It closed near $252 on Aug. 17. It fell to $220.01 the next day. By Wednesday afternoon it was trading around $212.56, close to the $221 a share the June 30 filings assumed. These funds get to wait until the next quarterly filing before they have to say whether they still own the stock, or at what price.
Insiders have been filing to sell, too
The same window brought a run of Form 144 notices, the paperwork someone files ahead of selling restricted or control stock. Five people connected to Cerebras filed between Aug. 14 and 18. Together they registered to sell about 205,000 Class A shares, worth about $49 million at the prices on the filings. That's under 0.2% of the 112 million shares outstanding, small next to the $4.64 billion these sixteen funds hold.
Three of the five are executives selling stock that vested the same day they filed: chief executive Andrew Feldman sold 26,644 shares worth about $6.7 million, chief technology officer Sean Lie sold 21,257 shares worth $5.4 million, and officer Dhiraj Mallick sold 38,889 shares worth $9.8 million. All three sold a similar batch back on June 25. This reads as a routine vesting sale, the kind that happens on a schedule, especially soon after a listing.
Early investors make up the other two names on the list. Steven Vassallo of Foundation Capital registered 50,000 shares worth about $11.6 million from stock a family trust bought in a 2016 private placement. Eric Vishria of Benchmark owns more than 10% of the company and registered 68,268 shares worth $15.7 million under a trading plan he set up in May. A Form 144 only signals intent to sell. The shares may or may not actually change hands.
Read next to the fund side of this story, the two sit in tension: institutions showing up as brand new owners, insiders and early backers lining up to sell part of what they already have.
What this does, and doesn't, tell you
Sixteen funds disclosing a stake in the same quarter tells you when the stock became visible to 13F filers. A stock that just went public tends to produce exactly this pattern on its own, sixteen managers filing in the same window because the window is when they first could, not because they compared notes. A 13F shows a snapshot on one day. The purchase date itself stays private. I went into the mechanics of what these filings show, and what they leave out, in more detail in this explainer.
What I'd actually pay attention to here is the concentration, more than the headline count of sixteen. Two funds hold 68% of what shows up in our tracker, and one of them put 16% of its own portfolio into a single name. That's a real conviction bet, a different kind of position than the 150,000-share lines further down the table. The same quarter, twenty funds disclosed SpaceX stakes, and several of the same names turn up on both lists.
What we actually know stops at June 30: a snapshot of who held what. Whether these funds still hold Cerebras, when in the quarter they bought it, and what any of them plan to do next all stay outside what a 13F can show. If a filing like this one has you thinking about following the trade, here's what the data actually says about copying hedge fund disclosures. Each fund's full record is on our hedge fund tracker.
Sources
- SEC Forms 13F-HR for the period ended June 30, 2026, filed Aug. 12 to Aug. 14, 2026, by the 16 funds named above, totaling $4.64 billion of Cerebras Systems common stock
- Altimeter Capital 13F-HR (accession 0001541617-26-000008): 7,225,037 shares valued at $1.60 billion, 20 positions, $9.83 billion portfolio
- Coatue Management 13F-HR (accession 0000919574-26-005478): eight rows totaling 7,011,028 shares and $1.55 billion, 211 rows overall, $48.63 billion portfolio
- March 31, 2026 13F-HR filings for the same 16 funds, none of which report Cerebras Systems
- SEC Forms 144 filed Aug. 14 to Aug. 18, 2026 by five Cerebras insiders (Andrew Feldman, Sean Lie, Dhiraj Mallick, Steven Vassallo and Eric Vishria), registering to sell a combined 205,058 Class A shares valued at about $49.1 million; 112,247,109 shares outstanding
Last updated Aug. 19, 2026.
