Do DISK and DRAM hold the same stocks?

By their latest filings, 48% of their books are the same securities at the same weight, which is a meaningful overlap. Overlap is the sum of the smaller weight of every security they share.

Which is more different from the S&P 500, DISK or DRAM?

DISK has 33% of its weight in S&P 500 names and DRAM has 20%, so DISK differs more from the index.

Which is cheaper, DISK or DRAM?

DISK charges 0.75% a year and DRAM charges 0.65%, so DRAM is cheaper. Fees come from each fund's prospectus.

Share on X Download as PDF Open live

DISK vs DRAM: which is really different?

DISK and DRAM hold 48% of their weight in the same names. Tema Memory ETF and Roundhill Memory ETF.

32.8%

DISK in the S&P 500

20.0%

DRAM in the S&P 500

−22.7%

DISK total return, since launch

+117.4%

DRAM total return, since launch

DISK · 3 months to Sep 30, 202667% of its weight is outside the S&P 500

33% of DISK's weight is in S&P 500 companies and 67% is outside the index

DRAM · 3 months to Sep 30, 202680% of its weight is outside the S&P 500

20% of DRAM's weight is in S&P 500 companies and 80% is outside the index

ETFIQ Off-Index Score · DISK scores higherHow much of it is not the index it is sold as an alternative to?

DISK 38.9

DRAM 38.9

0.1, the lowest in this set92.0, the highest

A percentile among the 375 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 →

What they hold in common

By the books each fund has filed, DISK and DRAM hold 48% of their money in the same securities at the same weight. Above 50%, holding both is close to holding one of them twice. Holdings dated Jun 30, 2026 and Sep 30, 2026.

50%

half

48% in common

Positions both hold, largest shared weight first

Holding DISK DRAM

SK HYNIX INC 15.84% 20.19%

SANDISK CORP 19.02% 6.62%

KIOXIA HOLDINGS CORP 16.50% 5.54%

SEAGATE TECHNOLOGY HOLDINGS PLC 4.67% 5.32%

SAMSUNG ELECTRONICS CO LTD 4.48% 18.26%

WESTERN DIGITAL CORP 4.17% 5.46%

MICRON TECHNOLOGY INC 4.88% 2.58%

NANYA TECHNOLOGY CORP 3.99% 2.31%

WINBOND ELECTRONICS CORP 3.37% 1.41%

MACRONIX INTERNATIONAL CO LTD 2.60% 0.45%

Only in DISK

CHANGXIN MEMORY TECHNOLOGIES-SWAP-MREX-L 5.14%

AEHR TEST SYSTEMS 4.74%

SK SQUARE CO LTD 4.73%

INNODISK CORP 2.27%

SHENZHEN TECHWINSEMI TECHNOLOGY CO LTD 1.46%

BIWIN STORAGE TECHNOLOGY CO LTD 1.41%

SK HYNIX INC 0.70%

Only in DRAM

TREASURY BILL 27.17%

GigaDevice Semiconductor Inc 3.90%

Phison Electronics Corp 0.80%

Weight overlap is an ETFIQ calculation: for every security both funds hold, the smaller of the two weights, summed.

48% of the two portfolios are the same securities at the same weight.

Performance, window by window

	Total return		vs the S&P 500		vs the Nasdaq-100
Window	DISK	DRAM	DISK	DRAM	DISK	DRAM
3 months	−13.9%	−8.3%	−16.4 pts	−10.9 pts	−16.0 pts	−10.5 pts
Since launch DISK Jun 2026 · DRAM Apr 2026	−22.7%	+117.4%	−25.1 pts	+100.6 pts	−23.3 pts	+90.7 pts

DISK and DRAM over each window. Every figure is an ETFIQ calculation with distributions reinvested. Source: ETFIQ. Open the live comparison on ETFIQ →

On the same fields

DISK

Tema Memory ETF · Holds 17 stocks in memory and storage, 33% of its weight in S&P 500 companies

DRAM

Roundhill Memory ETF · Holds 13 stocks in memory and storage, 20% of its weight in S&P 500 companies

Issuer Tema Roundhill

Theme Memory and storage Memory and storage

In the S&P 500 32.8% 20.0%

Active share vs the S&P 500 96.8% 96.8%

In the Nasdaq-100 32.8% 20.0%

Holdings 17 13

Top ten, share of the fund 84.2% 97.3%

Expense ratio 0.75% 0.65%

Fee for the differing part 0.77% 0.67%

Total return, 1 year −22.7% (since launch on Jun 30, 2026) +117.4% (since launch on Apr 2, 2026)

vs the S&P 500 −25.1 pts +100.6 pts

vs the Nasdaq-100 −23.3 pts +90.7 pts

Below its high −22.7% −25.2%

Net assets $88m $26.0bn

DISK and DRAM on the same fields, as of Sep 30, 2026. Source: ETFIQ.

DISK in plain words

By weight, 33% of DISK'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 84% of the fund across 17 positions, as published by its issuer for Sep 30, 2026. Since it launched on Jun 30, 2026 the fund returned −22.7% with distributions reinvested against +2.4% for the S&P 500, so a holder was behind by 25.1 pts. It sits 22.7% below its all-time high of Jun 30, 2026.

DRAM in plain words

By weight, 20% of DRAM'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 97% of the fund across 13 positions, as filed for Jun 30, 2026. Since it launched on Apr 2, 2026 the fund returned +117.4% with distributions reinvested against +16.9% for the S&P 500, so a holder was ahead by 100.6 pts. It sits 25.2% below its all-time high of Jun 22, 2026.

Questions people ask

Do DISK and DRAM hold the same stocks?: By their latest filings, 48% of their books are the same securities at the same weight, which is a meaningful overlap. Overlap is the sum of the smaller weight of every security they share.
Which is more different from the S&P 500, DISK or DRAM?: DISK has 33% of its weight in S&P 500 names and DRAM has 20%, so DISK differs more from the index.
Which is cheaper, DISK or DRAM?: DISK charges 0.75% a year and DRAM charges 0.65%, so DRAM is cheaper. Fees come from each fund's prospectus.

Other comparisons

DISK vs HBMX DRAM vs XME DRAM vs FDN DRAM vs GDX DRAM vs GDXJ DRAM vs HBMX DRAM vs IDEF DRAM vs IFRA

DISK on its own →DRAM on its own →How every figure is computed →Standards and sources →

Where these figures came from

DISK filings on SEC EDGAR ↗DISK prospectus with the expense ratio (SEC) ↗Tema page for DISK ↗DRAM filings on SEC EDGAR ↗DRAM prospectus with the expense ratio (SEC) ↗Roundhill page for DRAM ↗

ETFIQ links to the documents behind every figure. It is not affiliated with any issuer, and a link is not an endorsement. A comparison is not a recommendation.

Cite this page

ETFIQ, DISK against DRAM, data as of Sep 30, 2026. https://etfiq.com/compare/themes/disk-vs-dram

Open data

Free to use with attribution. Every figure is calculated from a named public source; the method is at etfiq.com/methodology.