OTCKX · MFS

MFS Mid Cap Growth Fund Class R6

Name: OTCKX (MFS Mid Cap Growth Fund Class R6) mutual-fund look-through valuation
Creator: ratio/fox
License: https://ratiofox.com/data-licence/v1

See how the latest disclosed equity holdings combine into this share class’s P/E and P/S. Daily NAV and the exact ISIN remain distinct for this share class.

ISIN US5529875545Income share classNAV US$29.69 as of 24 August 2026Holdings dated 31 May 2026Meets ratio/fox coverage standard

Core valuation

Trailing P/E56.16×98.82% coverage

Latest-quarter run-rate P/E93.60×98.82% coverage

Trailing P/S3.55×97.66% coverage

Latest-quarter run-rate P/S3.55×97.66% coverage

Coverage is the share of positive eligible-equity holding value represented in each metric. The reliability standard is at least 90.00% coverage with no individual uncovered holding above 1.00%. Missing inputs are excluded, never treated as zero. Signed ordinary/common earnings remain in aggregate P/E.

Largest reported holdings

Holding	Weight	Trailing P/E	Trailing P/S
MPWRMonolithic Power Systems, Inc.	4.26%	94.97×	21.87×
HWMHowmet Aerospace, Inc.	3.95%	62.36×	12.61×
PWRQuanta Services, Inc.	3.34%	86.84×	3.19×
TTWOTake-Two Interactive Software, Inc.	2.72%	-149.19×	6.68×
LYVLive Nation Entertainment, Inc.	2.62%	-104.37×	1.67×
NTRANatera, Inc.	2.18%	-210.11×	19.01×
TKOTKO Group Holdings, Inc.	2.12%	163.09×	7.29×
MASIMasimo Corp.	2.12%	123.50×	6.05×
ASNDAscendis Pharma A/S	2.07%	19.20×	13.60×
BURLBurlington Stores, Inc.	1.95%	32.93×	1.72×

* A holding uses its latest full-year result only when both trailing and latest-quarter inputs are unavailable; open the stock for the exact year end.

Most similar funds

Ranked by shared weight across matching disclosed company holdings and explicitly reported same-currency cash.

US0250837673 · Heritage Fund36.91% holdings overlap · United States
US9499153750 · Allspring Mid Cap Growth Fund34.40% holdings overlap · United States
US4812C16862 · JPMorgan Mid Cap Growth Fund32.95% holdings overlap · United States
US64122Q5238 · Neuberger Mid Cap Growth Fund32.04% holdings overlap · United States
US74441C1053 · PGIM Jennison Mid-Cap Growth Fund31.70% holdings overlap · United States

Sources and freshness

NAV and share-class identity come from MFS’s official product evidence. Holdings come from the issuer’s public holdings disclosure and are normalised to the shared stock look-through model.

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about

If your portfolio was one company, what would its P/E and P/S be?

Fund P/E figures published by issuers are often simplified.

One major issuer describes portfolio P/E as the weighted average price/earnings ratio of the stocks it holds.

This approach can exclude loss-making companies, causing the reported P/E to appear lower and the portfolio to look more attractively valued than when all holdings’ signed earnings are combined.

ratio/fox treats each ETF, mutual fund, or portfolio as one large conglomerate made up of its holdings. It combines their market values, signed earnings, and sales before calculating P/E and P/S. Loss-making companies reduce total earnings, while missing inputs reduce the reported coverage rather than being treated as zero.

The result is a consistent look-through valuation of the entire basket, with trailing and latest-quarter run-rate figures shown separately.

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How much of each company do you really own?

A company may appear in several ETFs and mutual funds while also being held directly. ratio/fox looks through every route, calculates each effective position, and combines matching companies. Instead of separate line items, you see your total exposure to the underlying company.

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Every ETF and mutual-fund page ranks the 25 most similar funds by shared portfolio weight. Matching companies and explicitly reported same-currency cash count toward overlap; unknown positions do not. See whether a new fund genuinely broadens your portfolio or mainly adds more of the companies you already own.

Which investments appear in public discovery?

Public API lists, browse pages, and sitemaps share the same research-ready universe. ETF and mutual-fund discovery requires an official holdings source and at least one disclosed holding. Stock discovery requires a positive locally supported market capitalisation. Direct detail lookups may still resolve identity-only audit rows; those pages show a clear unavailable state and are marked noindex until usable research data arrives.

Data quality

Registered users

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Registered users with verification state and portfolio counts
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Read-only summaries of registered users' portfolios
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Core valuation readiness

Core valuation readiness by metric, priority, and coverage
metric	priority	stock coverage	weight	most missing fields

ETF coverage

ETF coverage by holdings, mapping gaps, mapped weight, and P/E/P/S inputs
ETF	holdings	unmapped holdings	unmapped weight	mapped weight	official P/E/P/S inputs

Mutual fund coverage

Mutual fund share-class, holdings, and Core valuation coverage
mutual fund	share classes	holdings	unmapped holdings	unmapped weight	weakest core coverage	largest gap

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ratio/fox calculates each stock’s real P/E and P/S from its latest reported earnings and revenue

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ticker	company	P/E · trailing	P/E · quarter	P/S · trailing	P/S · quarter	exchange	country	currency	source currency	market cap	provider market cap	price market cap	price market cap status	current price	shares outstanding	earnings	forward earnings	fwd earn low	fwd earn high	fwd earn sources	revenue	forward revenue	fwd rev low	fwd rev high	fwd rev sources	forward P/E	forward P/S	earnings yield	fwd earnings yield	sales yield	fwd sales yield	earnings date	revenue date	price date	shares date	earnings/revenue provider	price provider	market cap source
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ratio/fox calculates each portfolio's real P/E and P/S as if it was one single company.

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ratio/fox calculates each ETF’s real P/E and P/S as if it was one single company.

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ETFs with look-through P/E and P/S valuation and source details
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ETF valuation

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Holdings

ETF, mutual-fund, or portfolio holdings with units, weights, values, USD inputs, and P/E/P/S
holding	exchange	units	weight	value	current price	market cap	earnings	forward earnings	revenue	forward revenue	P/E · trailing	P/E · quarter	company forward P/E	P/S · trailing	P/S · quarter	company forward P/S	actions

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Most similar funds

Shared weight is the sum of the smaller matching position in each fund. Explicit same-currency cash counts; missing or unresolved positions do not.

The 25 ETFs and mutual funds with the greatest shared portfolio weight
identifier	name	listed in	overlap (%)

Look-through stocks

Portfolio ETF, mutual-fund, and stock holdings expanded into underlying stocks with weights, values, USD inputs, and P/E/P/S
holding	exchange	units	weight	value	current price	market cap	earnings	forward earnings	revenue	forward revenue	P/E · trailing	P/E · quarter	company forward P/E	P/S · trailing	P/S · quarter	company forward P/S

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Trading listings

One company and one set of fundamentals, available through these exchange instruments.

Exchange instruments for this company
ticker	market	instrument	underlying ratio

ETF and mutual-fund exposure

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ETFs and mutual funds that include this stock, with the stock weight in each fund
fund	weight	holding date

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Source data rows for this stock
property	valuation item	fiscal/source period	value	source currency/unit	USD value	FX metadata	filing/report date	loaded when	source	note

MFS Mid Cap Growth Fund Class R6

Core valuation

Largest reported holdings

Most similar funds

Sources and freshness

Open ratio/fox through a web server

about

If your portfolio was one company, what would its P/E and P/S be?

How much of each company do you really own?

How much of one fund do you already own through another?

Which investments appear in public discovery?

Data quality

Registered users

User portfolios

Core valuation readiness

ETF coverage

Mutual fund coverage

Open data-quality issues

stocks

portfolios

Browser portfolios

New portfolio

ETFs

mutual funds

ETF valuation

eight reported quarters

This detail is unavailable

Included portfolios

Holdings

Most similar funds

Look-through stocks

Trading listings

ETF and mutual-fund exposure

MFS Mid Cap Growth Fund Class R6

Core valuation

Largest reported holdings

Most similar funds

Sources and freshness

Open ratio/fox through a web server

about

If your portfolio was one company, what would its P/E and P/S be?

How much of each company do you really own?

How much of one fund do you already own through another?

Which investments appear in public discovery?

Data quality

Registered users

User portfolios

Core valuation readiness

ETF coverage

Mutual fund coverage

Open data-quality issues

stocks

portfolios

Portfolio account

Browser portfolios

New portfolio

ETFs

mutual funds

ETF valuation

eight reported quarters

This detail is unavailable

Included portfolios

Holdings

Most similar funds

Look-through stocks

Trading listings

ETF and mutual-fund exposure