etfipo
Case study no. 06 — Forced buying·Q3 2026 (refiled May 4)

The day Cerebras Systems lists, 3 ETFs must buy $73.4M of it.

AI chip maker. Refiled amended S-1 May 4, 2026 at $115–125/share targeting Nasdaq under ticker CBRS. $1B Tiger-led round in Feb 2026 anchors the $23B valuation. Most concrete near-term IPO of the group.

$23.00B
$7B$46B

Base case: $23.00B (Amended S-1 filing May 4, 2026; SEC EDGAR). Use the slider to stress-test upside or downside scenarios.

12%
$3B$25B

Base case: 12%. Mega-IPOs typically float 5-15% initially. Lower float = higher demand vs supply imbalance.

Implied float $
$2.76B
ETF forced buying
$73.4M
% of float ETFs must absorb
2.7%
ETFs forced to act
3
QQQInvesco QQQ Trust

Top 100 non-financial Nasdaq-listed stocks by market cap. Annual reconstitution in December. Quarterly rebalancing.

AUM
$327.00B
Expense
20 bps
Est. entry weight
0.01%
Forced buying
$41.0M
Top 10 holdings — dollar outflow from dilution
Show full dilution math →
TickerNameOld wtNew wtΔ wt (bps)$ outflow
NVDANVIDIA8.750%8.749%-0.1-$3.6M
AAPLApple7.340%7.339%-0.1-$3.0M
MSFTMicrosoft5.100%5.099%-0.1-$2.1M
AMZNAmazon4.720%4.719%-0.1-$1.9M
MUMicron Technology3.880%3.880%-0.0-$1.6M
AVGOBroadcom3.650%3.650%-0.0-$1.5M
GOOGLAlphabet Class A3.010%3.010%-0.0-$1.2M
METAMeta Platforms2.890%2.890%-0.0-$1.2M
TSLATesla2.410%2.410%-0.0-$988670
COSTCostco2.230%2.230%-0.0-$914827
VTIVanguard Total Stock Market

Holds substantially all investable US equities. New IPOs added at quarterly rebalance after seasoning. Float-adjusted.

AUM
$480.00B
Expense
3 bps
Est. entry weight
0.01%
Forced buying
$24.1M
Top 10 holdings — dollar outflow from dilution
Show full dilution math →
TickerNameOld wtNew wtΔ wt (bps)$ outflow
NVDANVIDIA6.200%6.200%-0.0-$1.5M
AAPLApple5.800%5.800%-0.0-$1.4M
MSFTMicrosoft5.300%5.300%-0.0-$1.3M
AMZNAmazon3.400%3.400%-0.0-$818967
GOOGLAlphabet A+C3.200%3.200%-0.0-$770793
METAMeta Platforms2.500%2.500%-0.0-$602182
TSLATesla1.800%1.800%-0.0-$433571
BRK.BBerkshire Hathaway1.500%1.500%-0.0-$361309
AVGOBroadcom1.400%1.400%-0.0-$337222
JPMJPMorgan Chase1.300%1.300%-0.0-$313135
IPORenaissance IPO ETF

Fast-track inclusion ~5 days after IPO if market cap is large enough. Held for ~2 years post-listing. Cap weight ~10%.

AUM
$180.0M
Expense
60 bps
Est. entry weight
4.60%
Forced buying
$8.3M
Top 10 holdings — dollar outflow from dilution
Show full dilution math →
TickerNameOld wtNew wtΔ wt (bps)$ outflow
ARMArm Holdings9.400%8.968%-43.2-$778320
RDDTReddit8.100%7.727%-37.3-$670680
KVYOKlaviyo7.200%6.869%-33.1-$596160
CRWVCoreWeave6.800%6.487%-31.3-$563040
FIGFigma5.400%5.152%-24.8-$447120
BLSHBullish4.800%4.579%-22.1-$397440
KLARKlarna4.600%4.388%-21.2-$380880
CHYMChime4.100%3.911%-18.9-$339480
GEMIGemini3.800%3.625%-17.5-$314640
STUBStubHub3.500%3.339%-16.1-$289800
Eligibility matrix

Six ETFs. Six different inclusion timelines.

QQQ● Eligible

Nasdaq listing + market cap easily clears Nasdaq-100 threshold. Fast-track entry possible if market cap exceeds existing constituent (top 25% rule).

Timing: Next quarterly rebal or special inclusion ~3-5 days post-IPO if mega-cap
IPO● Eligible

Renaissance IPO ETF adds large US IPOs ~5 trading days after listing. Will likely enter as a top-3 holding given mega-cap size.

Timing: ~5 trading days post-IPO
VTI● Eligible

CRSP US Total Market includes all US-listed common stocks. Added at next quarterly rebalance (typ. ~30-90 day lag).

Timing: Next quarterly rebalance
SPY● Excluded

Multi-class structure historically blocks/delays inclusion (Snap precedent in 2017); Profitability requirement (4 consecutive profitable GAAP quarters) likely not met

Timing: Blocked until criteria met
VGT● Excluded

GICS classification likely outside Information Technology. Excluded from VGT.

Timing: N/A
ARKK● Conditional

Active fund — Cathie Wood's stated convictions strongly favor frontier-AI and space themes. Position size at PM discretion.

Timing: Any time post-listing
The playbook

Three trades the inclusion math points to.

i.

The most concrete near-term trade

Cerebras refiled May 4, 2026 at $115-125/share, Nasdaq under ticker CBRS. This is the only listing in the universe with an actual filed S-1 and price range — every other name is speculation. IPO ETF inclusion is mechanical at ~5 days post-listing.

ii.

The G42 customer concentration risk

Cerebras' relationship with Abu Dhabi-backed G42 is both the bull and bear case. Federal review delayed the prior filing; resolution is now priced in. Watch the S-1 for customer concentration disclosure — that's where the asymmetric information lives.

iii.

AI chip basket trade

Cerebras provides the first pure-play 'NVIDIA alternative' for public investors. Sympathy moves likely in AMD, AVGO, MRVL. Specialty AI chip names (GFS, AEHR) may see speculative bid as the trade rotates downstream.