CIK: 0001164632
Total reported value
$2.6B
Reporting period: 2026-06-30 · Number of holdings: 637
Chesley Taft & Associates LLC disclosed 637 holdings in its latest 13F filing for the period ending 2026-06-30, with total reported value of $2.6B and a quarterly turnover rate of 16.6%.
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Chesley Taft & Associates LLC's disclosed holdings carry a Herfindahl concentration index of 0.016 — mathematically equivalent to about 62 equally-sized positions, well below its 637 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes vary widely across the portfolio (a coefficient of variation of 2.22), with a handful of outsized bets alongside many smaller positions.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Add PANW
-5.4% $31.2M
Sold out HON
Add GOOG
-1.8% $25.6M
Trim MSFT
-8.8% -$7.1M
Trim COST
-1.8% -$5.2M
Trim GLD
-2.2% -$6.7M
Showing top 200 holdings (of 637 total)
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | GOOG | Alphabet Inc-cl C | Stock-Comm Services | 5.76% | +0.65% | -1.82% | |
| 2 | NVDA | Nvidia CORP | Stock-Tech | 3.62% | +0.17% | -1.79% | |
| 3 | AAPL | Apple INC | Stock-Tech | 3.20% | +0.18% | -0.02% | |
| 4 | AMZN | Amazon.com INC | Stock-Consumer Disc | 3.16% | +0.20% | +0.11% | |
| 5 | MSFT | Microsoft CORP | Stock-Tech | 3.15% | -0.53% | -8.78% | |
| 6 | AVGO | Broadcom INC | Stock-Tech | 3.13% | +0.30% | -2.50% | |
| 7 | PANW | Palo Alto Networks INC | Stock-Tech | 2.42% | +1.13% | -5.42% | |
| 8 | COST | Costco Wholesale CORP | Stock-Consumer Staples | 2.41% | -0.39% | -1.80% | |
| 9 | JPM | Jpmorgan Chase & Co | Stock-Financials | 2.18% | +0.03% | -2.31% | |
| 10 | IJR | Ishares Core S&p Small-cap E | ETF-Small Cap | 2.15% | +0.23% | +0.43% | |
| 11 | JNJ | Johnson & Johnson | Stock-Healthcare | 2.07% | — | -0.46% | |
| 12 | IXUS | Ishares Core Intl Stock ETF | ETF-Other | 2.01% | +0.12% | +3.60% | |
| 13 | IJH | Ishares Core S&p Midcap ETF | ETF-Other | 1.81% | +0.11% | -0.28% | |
| 14 | SPY | Ss Spdr S&p 500 ETF Trust-us | ETF-Large Cap & Growth | 1.79% | +0.09% | -1.59% | |
| 15 | SYK | Stryker CORP | Stock-Healthcare | 1.70% | -0.21% | -0.32% | |
| 16 | V | Visa Inc-class A Shares | Stock-Financials | 1.64% | +0.09% | -0.01% | |
| 17 | GOOGL | Alphabet Inc-cl A | Stock-Comm Services | 1.40% | +0.15% | -2.68% | |
| 18 | APH | Amphenol Corp-cl A | Stock-Tech | 1.39% | +0.30% | -2.04% | |
| 19 | CB | Chubb Limited | Stock-Financials | 1.38% | -0.02% | +1.08% | |
| 20 | GLD | Spdr Gold Shares | ETF-Commodities | 1.34% | -0.38% | -2.25% | |
| 21 | AXP | American Express Co | Stock-Financials | 1.08% | +0.03% | -1.53% | |
| 22 | MA | Mastercard INC - A | Stock-Financials | 1.01% | — | +0.18% | |
| 23 | ABT | Abbott Laboratories | Stock-Healthcare | 0.99% | — | +15.27% | |
| 24 | VEA | Vanguard Ftse Developed ETF | ETF-Other | 0.98% | +0.07% | +4.65% | |
| 25 | IVV | Ishares Core S&p 500 ETF | ETF-Large Cap & Growth | 0.97% | +0.14% | +9.90% | |
| 26 | LLY | Eli Lilly & Co | Stock-Healthcare | 0.95% | +0.16% | -0.38% | |
| 27 | RTX | Rtx CORP | Stock-Industrials | 0.92% | — | +2.69% | |
| 28 | VEU | Vanguard Ftse All-world Ex-u | ETF-Other | 0.86% | +0.04% | +0.68% | |
| 29 | PEP | Pepsico INC | Stock-Consumer Staples | 0.85% | -0.23% | -2.94% | |
| 30 | COF | Capital One Financial CORP | Stock-Financials | 0.85% | +0.07% | +6.71% | |
| 31 | KO | Coca-cola Co/the | Stock-Consumer Staples | 0.85% | — | -2.18% | |
| 32 | ORCL | Oracle CORP | Stock-Tech | 0.84% | — | -1.05% | |
| 33 | HD | Home Depot INC | Stock-Consumer Disc | 0.84% | — | -6.29% | |
| 34 | C | Citigroup INC | Stock-Financials | 0.83% | +0.12% | +2.09% | |
| 35 | TMO | Thermo Fisher Scientific INC | Stock-Healthcare | 0.83% | — | +1.12% | |
| 36 | AZO | Autozone INC | Stock-Consumer Disc | 0.82% | — | +1.20% | |
| 37 | META | Meta Platforms Inc-class A | Stock-Comm Services | 0.82% | — | -0.33% | |
| 38 | WM | Waste Management INC | Stock-Industrials | 0.80% | — | +0.63% | |
| 39 | ITW | Illinois Tool Works | Stock-Industrials | 0.78% | — | -4.48% | |
| 40 | UBER | Uber Technologies INC | Stock-Industrials | 0.76% | +0.08% | +19.90% | |
| 41 | EQT | Eqt CORP | Stock-Energy | 0.71% | -0.21% | -0.24% | |
| 42 | WFC | Wells Fargo & Co | Stock-Financials | 0.71% | — | -0.89% | |
| 43 | XOM | Exxon Mobil CORP | Stock-Energy | 0.69% | -0.26% | -3.67% | |
| 44 | JMUB | Jpmorgan Municipal ETF | ETF-Other | 0.62% | — | +11.22% | |
| 45 | AZN | AstraZeneca PLC | Stock-Healthcare | 0.60% | — | +3.14% | |
| 46 | MUB | Ishares National Muni Bond E | ETF-Other | 0.58% | — | -0.32% | |
| 47 | JMST | JPM Ultra-short Muni Income | ETF-Other | 0.57% | +0.08% | +24.16% | |
| 48 | EFA | Ishares Msci Eafe ETF | ETF-Other | 0.55% | — | — | |
| 49 | DIS | Walt Disney Co/the | Stock-Comm Services | 0.54% | — | -2.56% | |
| 50 | XLF | Ss Financial Select Sector | ETF-Other | 0.53% | — | +0.19% |
Performance for Q3 2026
+0.2%
Performance Last 4 Quarters
+13.5%
Based on 80% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-06-30 | 637 | $2.6B | 17 | |
| 2026-03-31 | 621 | $2.4B | 16 | |
| 2025-12-31 | 624 | $2.5B | 13 | |
| 2025-09-30 | 348 | $2.4B | 24 | |
| 2025-06-30 | 334 | $2.2B | 0 | |
| 2025-03-31 | 330 | $2.1B | 100 | |
| 2024-12-31 | 326 | $2.2B | 0 | |
| 2024-09-30 | 323 | $2.1B | 0 | |
| 2024-06-30 | 309 | $2.0B | 0 | |
| 2024-03-31 | 311 | $2.0B | 0 | |
| 2023-12-31 | 301 | $1.8B | 0 | |
| 2023-09-30 | 289 | $1.5B | 0 | |
| 2023-06-30 | 291 | $1.6B | 0 | |
| 2023-03-31 | 286 | $1.5B | 0 | |
| 2022-12-31 | 284 | $1.5B | 0 | |
| 2022-09-30 | 279 | $1.4B | 0 | |
| 2022-06-30 | 286 | $1.5B | 0 | |
| 2022-03-31 | 294 | $1.7B | 0 | |
| 2021-12-31 | 300 | $1.9B | 0 | |
| 2021-09-30 | 298 | $1.8B | 0 | |
| 2021-06-30 | 294 | $1.7B | 100 | |
| 2021-03-31 | 288 | $1.7B | 13 | |
| 2020-12-31 | 286 | $1.6B | 14 | |
| 2020-09-30 | 264 | $1.4B | 14 | |
| 2020-06-30 | 257 | $1.3B | 25 | |
| 2020-03-31 | 247 | $1.1B | 29 | |
| 2019-12-31 | 263 | $1.4B | 15 | |
| 2019-09-30 | 266 | $1.3B | 12 | |
| 2019-06-30 | 253 | $1.3B | 13 | |
| 2019-03-31 | 256 | $1.2B | 22 | |
| 2018-12-31 | 254 | $1.0B | 27 | |
| 2018-09-30 | 281 | $1.3B | 13 | |
| 2018-06-30 | 273 | $1.2B | 11 | |
| 2018-03-31 | 267 | $1.1B | 14 | |
| 2017-12-31 | 285 | $1.2B | 13 | |
| 2017-09-30 | 278 | $1.2B | 20 | |
| 2017-06-30 | 276 | $1.1B | 13 | |
| 2017-03-31 | 273 | $1.1B | 14 | |
| 2016-12-31 | 268 | $1.0B | 17 | |
| 2016-09-30 | 253 | $992.7M | 13 | |
| 2016-06-30 | 250 | $975.2M | 11 | |
| 2016-03-31 | 243 | $948.4M | 19 | |
| 2015-12-31 | 246 | $951.8M | 26 | |
| 2015-09-30 | 228 | $916.4M | 20 | |
| 2015-06-30 | 232 | $980.7M | 11 | |
| 2015-03-31 | 241 | $974.5M | 15 | |
| 2014-12-31 | 244 | $988.9M | 19 | |
| 2014-09-30 | 245 | $955.6M | 11 | |
| 2014-06-30 | 250 | $967.3M | 15 | |
| 2014-03-31 | 249 | $933.2M | 21 | |
| 2013-12-31 | 268 | $1.0B | 15 | |
| 2013-09-30 | 265 | $917.1M | 15 | |
| 2013-06-30 | 264 | $862.9M | — |
Chesley Taft & Associates LLC's most significant position changes for 2026-06-30: Sold out: Honeywell International INC (HON); Sold out: Tractor Supply Company (TSCO); New buy: Advanced Micro Devices (AMD); Trim: Palo Alto Networks INC (PANW) — shares -5.42%; Trim: Alphabet Inc-cl C (GOOG) — shares -1.82%.
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | PANW | Palo Alto Networks INC | +1.1% | -5.42% | Trim |
| 2 | GOOG | Alphabet Inc-cl C | +0.7% | -1.82% | Trim |
| 3 | AVGO | Broadcom INC | +0.3% | -2.50% | Trim |
| 4 | APH | Amphenol Corp-cl A | +0.3% | -2.04% | Trim |
| 5 | MU | Micron Technology INC | +0.3% | +113.32% | Add |
| 6 | IJR | Ishares Core S&p Small-cap E | +0.2% | +0.43% | Add |
| 7 | AMZN | Amazon.com INC | +0.2% | +0.11% | Add |
| 8 | DELL | Dell Technologies -c | +0.2% | +58.45% | Add |
| 9 | AAPL | Apple INC | +0.2% | -0.02% | Trim |
| 10 | CRM | Salesforce INC | +0.2% | +96.56% | Add |
| 11 | NVDA | Nvidia CORP | +0.2% | -1.79% | Trim |
| 12 | LLY | Eli Lilly & Co | +0.2% | -0.38% | Trim |
| 13 | GOOGL | Alphabet Inc-cl A | +0.2% | -2.68% | Trim |
| 14 | IVV | Ishares Core S&p 500 ETF | +0.1% | +9.90% | Add |
| 15 | IXUS | Ishares Core Intl Stock ETF | +0.1% | +3.60% | Add |
| 16 | C | Citigroup INC | +0.1% | +2.09% | Add |
| 17 | UNH | Unitedhealth Group INC | +0.1% | -1.31% | Trim |
| 18 | IJH | Ishares Core S&p Midcap ETF | +0.1% | -0.28% | Trim |
| 19 | AMD | Advanced Micro Devices | +0.1% | NEW | New buy |
| 20 | INTC | Intel CORP | +0.1% | +0.69% | Add |
| 21 | SPY | Ss Spdr S&p 500 ETF Trust-us | +0.1% | -1.59% | Trim |
| 22 | V | Visa Inc-class A Shares | +0.1% | -0.01% | Trim |
| 23 | UBER | Uber Technologies INC | +0.1% | +19.90% | Add |
| 24 | JMST | JPM Ultra-short Muni Income | +0.1% | +24.16% | Add |
| 25 | VEA | Vanguard Ftse Developed ETF | +0.1% | +4.65% | Add |
| 26 | COF | Capital One Financial CORP | +0.1% | +6.71% | Add |
| 27 | GEV | GE Vernova INC | +0.1% | +2.52% | Add |
| 28 | AMAT | Applied Materials INC | +0.1% | -15.17% | Trim |
| 29 | VB | Vanguard Small-cap ETF | +0.1% | +6.63% | Add |
| 30 | GWW | Ww Grainger INC | +0.1% | +0.72% | Add |
| 31 | VEU | Vanguard Ftse All-world Ex-u | 0% | +0.68% | Add |
| 32 | JPM | Jpmorgan Chase & Co | 0% | -2.31% | Trim |
| 33 | AXP | American Express Co | 0% | -1.53% | Trim |
| 34 | CB | Chubb Limited | 0% | +1.08% | Add |
| 35 | CDNS | Cadence Design Sys INC | -0.1% | -75.79% | Trim |
| 36 | CVX | Chevron CORP | -0.1% | -1.32% | Trim |
| 37 | ZTS | Zoetis INC | -0.1% | -51.60% | Trim |
| 38 | NFLX | Netflix INC | -0.1% | -0.89% | Trim |
| 39 | ICE | Intercontinental Exchange In | -0.1% | -0.58% | Trim |
| 40 | ADBE | Adobe INC | -0.2% | -49.16% | Trim |
| 41 | EQT | Eqt CORP | -0.2% | -0.24% | Trim |
| 42 | SYK | Stryker CORP | -0.2% | -0.32% | Trim |
| 43 | TSCO | Tractor Supply Company | -0.2% | EXIT | Sold out |
| 44 | PEP | Pepsico INC | -0.2% | -2.94% | Trim |
| 45 | XOM | Exxon Mobil CORP | -0.3% | -3.67% | Trim |
| 46 | ACN | Accenture plc | -0.4% | -7.94% | Trim |
| 47 | GLD | Spdr Gold Shares | -0.4% | -2.25% | Trim |
| 48 | COST | Costco Wholesale CORP | -0.4% | -1.80% | Trim |
| 49 | MSFT | Microsoft CORP | -0.5% | -8.78% | Trim |
| 50 | HON | Honeywell International INC | -0.9% | EXIT | Sold out |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-06-30 | 2026-07-08 | 13F-HR | View on EDGAR |
| 2026-03-31 | 2026-04-13 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-01-14 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-10-08 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-07-09 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-04-10 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-01-17 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-10-07 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-07-19 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-04-16 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-01-11 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-10-11 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-07-18 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-04-11 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-01-20 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-10-13 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-07-07 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-04-14 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-01-05 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-10-05 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-07-07 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-04-06 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-01-11 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-10-08 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-07-08 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-04-15 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-01-10 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-10-07 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-07-10 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-04-05 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-01-07 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-10-12 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-07-12 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-04-11 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-01-10 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-10-13 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-07-13 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-04-10 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-01-11 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-10-17 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-07-21 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-04-26 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-09 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-10-29 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-07-07 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-04-09 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-01-12 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-10-02 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-07-17 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-04-11 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-01-13 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-10-25 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-07-22 | 13F-HR | View on EDGAR |
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