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BRIGHT ROCK CAPITAL MANAGEMENT, LLC

Registered adviser
Location
HANOVER, MA
Portfolio Value
Small $522,615,012
Diversification
Diversified
Filing Date
Global Rank
#3,701 / 8,811 ▼ 394 · as of Jun 2026
Top Industry
Software - Infrastructure 7.3%
Period ended 21 days ago
Filed Oct 5, 2026 · 16d
27 quarters · since Mar 2020

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type
Registered adviser
Form ADV roster, Oct 1, 2026
Form ADV adviser
CRD 152820
Roster of Oct 1, 2026
Regulatory AUM
$535,988,766
Main clients
Registered funds and BDCs (100% of AUM)
Registered funds advised
2 series (0 index, 0 ETFs)
$501,793,098 net assets· N-CEN Feb 28, 2026
Form ADV history
Monthly rosters from Dec 2019; each row is a run with the same figures, newest first.
Rosters Regulatory AUM Main clients
Apr 2026 to Oct 2026 $535,988,766 Registered funds and BDCs (100%)
Mar 2025 to Mar 2026 $492,000,000 Registered funds and BDCs (100%)
Sep 2024 to Feb 2025 $483,000,000 Registered funds and BDCs (100%)
Apr 2024 to Aug 2024 $474,000,000 Registered funds and BDCs (100%)
May 2023 to Mar 2024 $402,000,000 Registered funds and BDCs (100%)
Apr 2023 $402,000,000 Registered funds and BDCs (100%)
4 earlier changes not shown.

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, the newest measured quarter, never from the firm's own description.

Style
Diversified active
Top 10 weight 37.9%, 41.3 effective positions, active share 69.4% against the S&P 500 as of 2026-06-30; it meets none of the index-like, systematic-like or concentrated tests
Turnover
Medium turnover
32.3% over the last four quarters (30% to under 100%)
Horizon
Long horizon
Value-weighted holding period 17.1 quarters (12+), a floor since 44.7% of the book was already held when coverage starts

Closest benchmark: the S&P 500 as of 2026-06-30, active share 69.4%; sector active share 18.6% against the combined 13F book's sector weights.

Over time 26 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

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Portfolio Concentration

72 tracked positions · as of Sep 30, 2026 · Δ vs Jun 30, 2026
Top Position
7.3%
+1.7 pts
Top 5
25.1%
+2.2 pts
Top 10
40.5%
+2.6 pts
HHI
267
Dec 2023 → Sep 2026 · range 222 – 267
Diversified+25

Portfolio Trend

27 quarters · across all stocks

Sector Breakdown

As of Sep 30, 2026
Sector % Portfolio Value
Technology 26.1% $136,169,226
Financial Services 17.2% $90,054,492
Healthcare 15.3% $79,729,205
Industrials 9.5% $49,582,250
Consumer Cyclical 9.4% $49,271,250
Communication Services 8.6% $45,073,140
Consumer Defensive 5.8% $30,406,784
Basic Materials 2.9% $15,205,855
Energy 2.8% $14,558,650
Utilities 2.4% $12,564,160
Unclassified 0.0% $0

Last Quarter's Activity

Export CSV
Sep 30, 2026 vs Jun 30, 2026

Added To

Positions the filer increased
6 positions
Ticker Δ Shares Shares Value Open

Trimmed

Positions the filer reduced
2 positions
Ticker Δ Shares Shares Value Open

New Positions

Positions the filer opened this quarter
7 positions
Ticker Shares Value Open

Sold Out

Positions the filer fully exited
8 positions
Ticker Shares Value Open

Portfolio Positions

Export CSV View 13F filing
72 tracked positions · $522,615,012 total · filing declares 72 positions · $529,095,014 · as of Sep 30, 2026
Showing 1–50 of 72 positions by value · page 1 of 2
Ticker Company Shares Value (USD) % of Portfolio History

Showing the top 50 of 72 positions. Create a free account to see every position, past quarters, search, filters and CSV export.

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.