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FRONTIER CAPITAL MANAGEMENT CO LLC

SEC Form 13F institutional filer · CIK 0000351173

13F-HR · 70 reported holdings · 2026-03-31

SEC-registered institutional investment manager.

Reported long-US-equity value

$1.43B

Top-10 concentration

42.4%

FRONTIER CAPITAL MANAGEMENT CO LLC — $1.43B AUM allocation strategy

FRONTIER CAPITAL MANAGEMENT CO LLC files SEC Form 13F and reports $1.43B of long US equity value across 70 reported holdings for 2026-03-31.

Its largest sector bet is Information Technology 30.9%, followed by Industrials 11.8% and Health Care 11.3%.

The top 10 holdings account for 42% of reported value — a broadly spread portfolio. The sector and industry splits below are of the same reported value. Track quarter-over-quarter adds, trims, new positions and exits below — sourced from SEC 13F filings, public domain.

FRONTIER CAPITAL MANAGEMENT CO LLC — latest SEC 13F insights

Reported long-US-equity value (13F AUM)

$1.43B

total across 70 reported holdings · 2026-03-31 · excludes shorts, cash, non-US

Top-10 concentration

42% of value

higher = narrower conviction; lower = spread / hedging

Biggest adds (shares)

$AKAM$BLDR$TTD

+$AKAM +580K sh · +$79.2M+$BLDR +284K sh · +$11.6M+$TTD +214K sh · +$3.23M

Biggest trims (shares)

$RL$TER$COHR

−$RL −2.52M sh · −$59.1M−$TER −388K sh · −$56.3M−$COHR −278K sh · −$45.3M

Added from nil (new positions)

$COR$WDAY$DECK$SWKS$MSI

5 fresh holdings — new conviction

Exited to nil (held last quarter, gone now)

$DVN$TYL$KKR$APP$CDW

$DVN ($10.2M last qtr)$TYL ($9.4M last qtr)$KKR ($8.29M last qtr)$APP ($7.07M last qtr)$CDW ($6.36M last qtr)

Sector allocation (share of reported value)

Information Technology 31%Industrials 12%Health Care 11%Consumer Discretionary 6%Utilities 2%Other holdings 38%SECTORS
  • $XLKInformation Technology30.9%—
  • $XLIIndustrials11.8%—
  • $XLVHealth Care11.3%—
  • $XLYConsumer Discretionary6.3%—
  • $XLUUtilities2.0%—
  • Other holdings37.7%—

each slice is a share of the reported long-US-equity value — smaller sectors and the rest of the book roll into “Other holdings”

Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.

Industry allocation (share of reported value)

Semiconductors 10%Internet Services & Infrastructure 8%Building Products 5%Health Care Equipment 5%Electronic Manufacturing Services 5%Hotels, Resorts & Cruise Lines 5%Health Care Supplies 4%Semiconductor Materials & Equipment 4%Other holdings 55%INDUSTRIES
  • Semiconductors9.8%—
  • Internet Services & Infrastructure8.3%—
  • Building Products5.0%—
  • Health Care Equipment4.7%—
  • Electronic Manufacturing Services4.7%—
  • Hotels, Resorts & Cruise Lines4.6%—
  • Health Care Supplies4.1%—
  • Semiconductor Materials & Equipment3.8%—
  • Other holdings54.9%—

the finer GICS cut of the same book — same denominator — smaller industries roll into “Other holdings”

Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.

Top S&P 500 holdings

10 of 10 rows · sorted by Value ↓

TickerHoldingSharesValueΔ QoQWeight
$AKAMAkamai Technologies Inc1.04M$119M+580K8.3%
$MPWRMonolithic Power Systems Inc79.7K$87.1M-4.42K6.1%
$BLDRBuilders FirstSource Inc860K$70.8M+284K4.9%
$RCLRoyal Caribbean Cruises Ltd238K$65.6M+22.4K4.6%
$TERTeradyne Inc183K$54.3M-388K3.8%
$MRVLMarvell Technology Inc541K$53.6M+12K3.7%
$JBLJabil Inc165K$43.8M+3.43K3.1%
$CMICummins Inc742K$42.1M+88.7K2.9%
$PODDInsulet Corporation173K$36.2M+56.7K2.5%
$CORCencora Inc109K$34.3M—2.4%

…and 60 more holdings in the full 13F filing (top positions only shown).

SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported

← All 13F filers·← QuantOrb.pro

How to read Δ QoQ — the five insight categories, and the caveats

The categories. Analysts, quants and retail traders look past total portfolio value to isolate actionable signals. Five categories matter.

Conviction & concentration shifts

New positions vs complete exits — a brand-new stock signals high conviction; a full liquidation suggests a broken thesis or tax-loss harvesting. Aggressive sizing — look at share count, not dollars: a 20% share increase during a drawdown is strong dip-buying. Concentration — a narrowing top-5/10 means conviction; spreading capital across more names means hedging.

Sector & macro allocation rotations

Aggregating Δ QoQ moves across sectors shows where smart money is leaning in or sneaking out — rotating out of growth into defensives or energy, for example. The fund's total long equity exposure quarter-over-quarter is a proxy for overall institutional risk appetite.

Crowding & smart-money consensus

When several managers initiate or expand the same stock in the same quarter, that is institutional consensus. Contrarian reads: top pickers buying hard into a beaten-down name the market is selling.

Derivative & option overlays

Reported call/put changes indicate whether managers are adding downside hedges or leveraging upside exposure. Note: a long increase may be half of a market-neutral pair trade.

Who reads this

Retail "cloners"High-conviction ideas to replicate ~45 days after quarter-end.
Corporate IRWhich funds bought or dumped the stock, before the next call.
Quant / algo tradersCross-sectional factor inputs: flow, momentum, ownership.

Four caveats before you trade on it

  • 45-day lag — holdings are quarter-end; positions may already be closed.
  • Long-only — 13Fs miss shorts, pair trades and cash.
  • No non-US / fixed income — the picture is US equities plus options.
  • Corporate actions — splits and spinoffs distort raw share deltas.

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