Data as of .
ARKK vs BULD: which is really different?
ARKK and BULD hold 1% of their weight in the same names, and BULD returned more over the year.
ETFIQ Off-Index Score: BULD scores higher
How much of it is not the index it is sold as an alternative to?
A percentile among the 379 thematic ETFs with a holdings filing. It is a position in a set, not a rating, and neither end of it is a recommendation. All thematic ETFs ranked by it · How it is computed
1% of the two portfolios are the same securities at the same weight.
What they hold in common
By the books each fund has filed, ARKK and BULD hold 1% of their money in the same securities at the same weight.
| Holding | ARKK | BULD |
|---|---|---|
| TERADYNE INC | 0.93% | 1.50% |
| Only in ARKK | Only in BULD |
|---|---|
| TESLA INC 9.26% | ASML Holding NV 8.91% |
| SPACE EXPLORATION TECHN-CL A 6.37% | Proto Labs Inc 8.59% |
| TEMPUS AI INC-CL A 5.92% | Lam Research Corp 8.44% |
| CIRCLE INTERNET GROUP INC 5.20% | Applied Materials Inc 8.29% |
| COINBASE GLOBAL INC -CLASS A 4.67% | Stratasys Ltd 5.79% |
| CRISPR THERAPEUTICS AG 4.64% | KLA Corp 5.53% |
| ROBINHOOD MARKETS INC - A 4.19% | Autodesk Inc 5.49% |
| TWIST BIOSCIENCE CORP 3.95% | 3D Systems Corp 4.82% |
Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed. Above 50%, holding both is close to holding one of them twice. Holdings dated Apr 30, 2026 and Sep 21, 2026.
Performance, window by window
| Window | Total return | vs the S&P 500 | vs the Nasdaq-100 | |||
|---|---|---|---|---|---|---|
| ARKK | BULD | ARKK | BULD | ARKK | BULD | |
| 3 months | +10.0% | −7.2% | +7.8 pts | −9.5 pts | +12.5 pts | −4.8 pts |
| 6 months | +27.6% | +26.1% | +9.6 pts | +8.1 pts | +3.4 pts | +1.9 pts |
| 1 year | +6.1% | +37.2% | −10.5 pts | +20.6 pts | −15.7 pts | +15.4 pts |
| 3 years | +112.5% | +84.5% | +34.1 pts | +6.1 pts | +14.4 pts | −13.7 pts |
| Since launch | +378.7% | +75.7% | +17.3 pts | −19.8 pts | −299.9 pts | −60.9 pts |
| ARKK ARK Innovation ETF Holds 46 stocks in broad innovation and megatrends, 36% of its weight in S&P 500 companies | BULD Pacer BlueStar Engineering the Future ETF Holds 55 stocks in broad innovation and megatrends, 36% of its weight in S&P 500 companies | |
|---|---|---|
| Issuer | ARK | Pacer |
| Theme | Broad innovation and megatrends | Broad innovation and megatrends |
| In the S&P 500 | 36.2% | 35.8% |
| Active share vs the S&P 500 | 85.7% | 97.2% |
| In the Nasdaq-100 | 27.3% | 36.7% |
| Holdings | 46 | 55 |
| Top ten, share of the fund | 49.7% | 62.9% |
| Expense ratio | 0.75% | 0.49% |
| Fee for the differing part | 0.88% | 0.50% |
| Total return, 1 year | +6.1% | +37.2% |
| vs the S&P 500 | −10.5 pts | +20.6 pts |
| vs the Nasdaq-100 | −15.7 pts | +15.4 pts |
| Below its high | −42.9% | −10.4% |
| Net assets | $9.3bn | $5m |
ARKK in plain words
By weight, 36% of ARKK's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 86%. The top ten holdings are 50% of the fund across 46 positions, as published by its issuer for Sep 21, 2026. Over the year to Sep 18, 2026 the fund returned +6.1% with distributions reinvested against +16.6% for the S&P 500, so a holder was behind by 10.5 pts. It sits 42.9% below its all-time high of Feb 12, 2021.
BULD in plain words
By weight, 36% of BULD's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 97%. The top ten holdings are 63% of the fund across 55 positions, as filed for Apr 30, 2026. Over the year to Sep 18, 2026 the fund returned +37.2% with distributions reinvested against +16.6% for the S&P 500, so a holder was ahead by 20.6 pts. It sits 10.4% below its all-time high of Jun 30, 2026.
Questions people ask
- Do ARKK and BULD hold the same stocks?
- By their latest filings, 1% of their books are the same securities at the same weight, which is mostly different names. Overlap is the sum of the smaller weight of every security they share.
- Which is more different from the S&P 500, ARKK or BULD?
- ARKK has 36% of its weight in S&P 500 names and BULD has 36%, so BULD differs more from the index.
- Which is cheaper, ARKK or BULD?
- ARKK charges 0.75% a year and BULD charges 0.49%, so BULD is cheaper. Fees come from each fund's prospectus.
Other comparisons
Where these figures came from
ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement.
Cite this page. ETFIQ, ARKK against BULD, data as of Sep 18, 2026. https://etfiq.com/compare/themes/arkk-vs-buld Free to use with attribution; the underlying files are at Open data.