Institutional Manager · CIK 0001168889
CARDEROCK CAPITAL MANAGEMENT INC
CHEVY CHASE, MD · File #028-10166
Latest AUM
$412.7M
Positions
69
Top-10 Concentration
35.0%
Filings
9
Portfolio Value Over Time
2024-03
2024-06
2024-09
2024-12
2025-03
2025-06
2025-09
2025-12
Biggest QoQ Changes
Ranked by conviction flow (share change × current price) so mark-to-market moves don't dominate. Price effect column shows how much of the $ change was just the stock moving.
| Action | Issuer | Ticker / CUSIP | Δ Shares | Flow ($) | Price Effect |
|---|---|---|---|---|---|
| NEW | IDEXX LABS INC | 45168D104 | +16,775 | +$11.3M | $0 |
| EXITED | Idexx Labs | 45168d104 | -16,984 | -$10.9M | $0 |
| EXITED | Quanta Svcs | 74762e102 | -24,399 | -$10.1M | $0 |
| NEW | QUANTA SVCS INC | 74762E102 | +23,914 | +$10.1M | $0 |
| NEW | STERIS PLC | STE | +37,085 | +$9.4M | $0 |
| EXITED | Steris PLC | g8473t100 | -29,741 | -$7.4M | $0 |
| EXITED | Lockheed Martin Corp | 539830109 | -8,508 | -$4.2M | $0 |
| REDUCE | ACCENTURE PLC IRELAND | ACN | -15,681 | -$4.2M | +$440,097 |
| REDUCE | WATSCO INC | WSO-B | -11,677 | -$3.9M | -$976,507 |
| ADD | THERMO FISHER SCIENTIFIC INC | TMO | +5,662 | +$3.3M | +$1.4M |
Sector Allocation
Filing History
- 13F HOLDINGS REPORTQ/E Dec 202569 pos · $412.7M
- 13F HOLDINGS REPORTQ/E Sep 202572 pos · $411.3M
- 13F HOLDINGS REPORTQ/E Jun 2025139 pos · $390.4M
- 13F HOLDINGS REPORTQ/E Mar 202570 pos · $377.3M
- 13F HOLDINGS REPORTQ/E Dec 202473 pos · $398.7M
- 13F HOLDINGS REPORTQ/E Sep 202473 pos · $423.6M
- 13F HOLDINGS REPORTQ/E Jun 202469 pos · $382.2M
- 13F HOLDINGS REPORTQ/E Mar 202468 pos · $356.8M
- 13F HOLDINGS REPORTQ/E Dec 202357 pos · $298.0M
Top 20 Holdings — Dec 2025
| # | Issuer | Ticker | Shares | Value | % of Portfolio |
|---|---|---|---|---|---|
| 1 | ALPHABET INC | GOOG | 58,651 | $18.4M | 4.52% |
| 2 | LAM RESEARCH CORP | LRCX | 105,936 | $18.1M | 4.47% |
| 3 | AMPHENOL CORP NEW | 032095101 | 123,775 | $16.7M | 4.12% |
| 4 | APPLE INC | AAPL | 51,335 | $14.0M | 3.44% |
| 5 | ELI LILLY & CO | LLY | 12,184 | $13.1M | 3.23% |
| 6 | MASTERCARD INCORPORATED | MA | 22,443 | $12.8M | 3.16% |
| 7 | MICROSOFT CORP | MSFT | 26,269 | $12.7M | 3.13% |
| 8 | THERMO FISHER SCIENTIFIC INC | TMO | 21,017 | $12.2M | 3.00% |
| 9 | S&P GLOBAL INC | SPGI | 23,241 | $12.1M | 2.99% |
| 10 | HEICO CORP NEW | HEI-A | 37,313 | $12.1M | 2.97% |
| 11 | IDEXX LABS INC | 45168D104 | 16,775 | $11.3M | 2.80% |
| 12 | MONOLITHIC PWR SYS INC | 609839105 | 11,469 | $10.4M | 2.56% |
| 13 | INTUITIVE SURGICAL INC | ISRG | 18,244 | $10.3M | 2.55% |
| 14 | QUANTA SVCS INC | 74762E102 | 23,914 | $10.1M | 2.49% |
| 15 | PARKER-HANNIFIN CORP | PH | 11,256 | $9.9M | 2.44% |
| 16 | STERIS PLC | STE | 37,085 | $9.4M | 2.32% |
| 17 | OREILLY AUTOMOTIVE INC | 67103H107 | 102,914 | $9.4M | 2.31% |
| 18 | AMETEK INC | AME | 43,789 | $9.0M | 2.21% |
| 19 | MOODYS CORP | MCO | 17,568 | $9.0M | 2.21% |
| 20 | FAIR ISAAC CORP | FICO | 5,241 | $8.9M | 2.18% |