FRONTIER CAPITAL MANAGEMENT CO LLC

Q1 2026 13F-HR Holdings

Location
Boston, MA
Holdings as of
3/31/2026
Date filed
5/15/2026
Form type
13F-HR
Num holdings
291
Total value ($000)
$9,729,473
Net value change ($000)
+305,877 (3.2%)
New positions
29
Sold out positions
33
Turnover %
9.4%
Sector allocation + QoQ delta (equities-only)
Prev filing: 2/17/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q4 2025
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
LRN 126,167 1209.2%
AKAM 79,172 198.5%
KEX 70,972 484.6%
LBRT 68,490 2048.1%
JAZZ 66,819 215.7%
UTHR 61,568 69.7%
CRCL 58,092 64.8%
AR 57,262 NEW
DAR 53,949 55.1%
APGE 53,333 147.1%
Top Reduces (Value $000, Stocks/ETFs)
MDB -74,327 -58.6%
NTRA -60,662 -50.8%
MAT -59,058 -70.6%
TER -56,256 -50.9%
MKSI -50,950 -57.9%
WBS -50,378 -100.0%
ALAB -46,903 -38.3%
U -46,399 -100.0%
COHR -45,261 -62.7%
ATI -39,851 -28.3%
Instrument mix + QoQ Δ (ex-options)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type