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Chesley Taft & Associates LLC — 13F Holdings & Portfolio

CIK 1164632 · latest 13F-HR filed 2026-10-13

Backtest portfolio

Chesley Taft & Associates LLC manages $2.56B in 13F-reported U.S. long-equity assets across 629 reported positions as of its 2026-09-30 13F-HR filing. Its largest disclosed positions are GOOG (5.02%), MSFT (3.98%), NVDA (3.94%). Quarter over quarter (versus its 2026-06-30 filing) the fund opened 13 new positions and exited 17; 93 existing positions rose in reported value and 141 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM
$2.56B

Long-equity book

Holdings
629

Distinct positions

Period
2026-09-30

Filed 2026-10-13

Q/Q Activity
+13 / −17 / ↑93 / ↓141

vs 2026-06-30

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q3 26
GOOG5.4% · -2%MSFT4.3% · -2%NVDA4.1% · -0%AAPL3.6% · -2%AMZN3.3% · -1%AVGO2.9% · -1%PANW2.4% · -14%COST2.3% · -2%JPM2.2% · -1%JNJ2.2% · -1%IXUS2.0% · +2%IJR1.9% · -1%SPY1.8% · -1%V1.7% · -1%IJH1.7% · -0%SYK1.5% · -1%GLD1.5% · +6%GOOGL1.3% · -2%CB1.3% · +0%APH1.3% · +95%TMO1.1% · -0%MA1.1% · +1%ABT1.1% · +1%META1.0% · -2%VEA1.0% · +2%AXP1.0% · -1%IVV0.9% · -7%LLY0.9% · -0%RTX0.9% · +1%KO0.9% · -1%VEU0.8% · -1%COF0.8% · +2%ORCL0.8% · -1%PEP0.8% · -3%C0.8% · +1%WM0.8% · +2%ITW0.7% · -1%AZO0.7% · +0%CRM0.7% · -7%WFC0.7% · -3%ACN0.6% · -1%JMUB0.6% · +6%JMST0.6% · +6%DIS0.6% · -2%AZN0.6% · +12%EQT0.6% · -12%UNP0.6% · +8%HONA0.6% · newEFA0.6% · 0%MUB0.5% · -3%XLF0.5% · 0%CVX0.5% · +30%VB0.5% · +2%ICE0.5% · -1%ECL0.4% · +1%HON0.4% · newNEE0.4% · +1%VO0.4% · +4%FLOT0.4% · +4%VTI0.4% · -1%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q2 26 → Q3 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 32.8%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

Name Title / Status Ownership Type

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

Show all 93 →

Top Trims

Show all 141 →

New Positions

Show all 13 →

Exited Positions

Show all 17 →

Chesley Taft & Associates LLC Holdings (2026-09-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 ALPHABET INC GOOG 02079K107 $128.5M 5.02% 377,136 SH
2 MICROSOFT CORP MSFT 594918104 $101.9M 3.98% 198,704 SH
3 NVIDIA CORPORATION NVDA 67066G104 $100.9M 3.94% 441,749 SH
4 APPLE INC AAPL 037833100 $88.0M 3.44% 264,336 SH
5 AMAZON COM INC AMZN 023135106 $77.3M 3.02% 310,222 SH
6 BROADCOM INC AVGO 11135F101 $69.9M 2.73% 199,130 SH
7 PALO ALTO NETWORKS INC PANW 697435105 $58.2M 2.27% 146,494 SH
8 COSTCO WHOLESALE CORPORATION COST 22160K105 $55.0M 2.15% 60,393 SH
9 JPMORGAN CHASE & CO JPM 46625H100 $52.3M 2.04% 158,008 SH
10 JOHNSON & JOHNSON JNJ 478160104 $49.5M 1.93% 186,955 SH
11 ISHARES TR IXUS 46432F834 $49.5M 1.93% 521,011 SH
12 ISHARES TR IJR 464287804 $45.1M 1.76% 331,704 SH
13 STATE STR SPDR S&P 500 ETF T SPY 78462F103 $41.8M 1.63% 54,806 SH
14 ISHARES TR IJH 464287507 $40.5M 1.58% 563,140 SH
15 VISA INC V 92826C839 $39.7M 1.55% 110,345 SH
16 STRYKER CORPORATION SYK 863667101 $35.3M 1.38% 128,180 SH
17 SPDR GOLD TR GLD 78463V107 $32.9M 1.29% 86,406 SH
18 ALPHABET INC GOOGL 02079K305 $32.6M 1.27% 94,737 SH
19 AMPHENOL CORP APH 032095101 $31.1M 1.22% 369,010 SH
20 CHUBB LIMITED CB H1467J104 $30.8M 1.20% 94,639 SH
21 THERMO FISHER SCIENTIFIC INC TMO 883556102 $27.2M 1.06% 40,333 SH
22 META PLATFORMS INC META 30303M102 $25.2M 0.98% 34,694 SH
23 ABBOTT LABORATORIES ABT 002824100 $25.0M 0.98% 253,052 SH
24 MASTERCARD INCORPORATED MA 57636Q104 $24.8M 0.97% 45,058 SH
25 VANGUARD TAX-MANAGED FDS VEA 921943858 $24.0M 0.94% 339,362 SH
26 AMERICAN EXPRESS CO AXP 025816109 $23.9M 0.93% 78,503 SH
27 ELI LILLY & CO LLY 532457108 $22.6M 0.88% 19,522 SH
28 COCA COLA CO KO 191216100 $22.1M 0.87% 257,241 SH
29 ISHARES TR IVV 464287200 $21.5M 0.84% 28,038 SH
30 VANGUARD INTL EQUITY INDEX F VEU 922042775 $20.6M 0.80% 247,754 SH
31 RTX CORPORATION RTX 75513E101 $20.2M 0.79% 108,973 SH
32 ORACLE CORP ORCL 68389X105 $19.7M 0.77% 143,665 SH
33 CAPITAL ONE FINL CORP COF 14040H105 $18.9M 0.74% 97,690 SH
34 PEPSICO INC PEP 713448108 $18.6M 0.73% 146,794 SH
35 ILLINOIS TOOL WKS INC ITW 452308109 $18.0M 0.70% 69,831 SH
36 SALESFORCE INC CRM 79466L302 $17.7M 0.69% 77,082 SH
37 WASTE MGMT INC DEL WM 94106L109 $16.9M 0.66% 83,088 SH
38 AUTOZONE INC AZO 053332102 $16.4M 0.64% 5,808 SH
39 WELLS FARGO & CO WFC 949746101 $16.4M 0.64% 204,659 SH
40 ACCENTURE PLC IRELAND ACN G1151C101 $15.9M 0.62% 86,804 SH
41 CITIGROUP INC C 172967424 $15.9M 0.62% 122,927 SH
42 DISNEY WALT CO DIS 254687106 $14.7M 0.57% 140,137 SH
43 J P MORGAN EXCHANGE TRADED F JMST 46641Q654 $14.7M 0.57% 290,515 SH
44 J P MORGAN EXCHANGE TRADED F JMUB 46641Q647 $14.4M 0.56% 303,085 SH
45 UNION PAC CORP UNP 907818108 $14.0M 0.55% 51,612 SH
46 HONEYWELL AEROSPACE INC HONA 43849R105 $12.9M 0.50% 83,134 SH
47 EQT CORP EQT 26884L109 $12.8M 0.50% 262,913 SH
48 ISHARES TR MUB 464288414 $12.5M 0.49% 123,451 SH
49 ISHARES TR EFA 464287465 $12.2M 0.48% 117,603 SH
50 ASTRAZENECA PLC AZN G0593M107 $12.2M 0.48% 75,281 SH
Filing History
Period Filed AUM Holdings Accession
2026-09-30 2026-10-13 $2.56B 629 0001164632-26-000006
2026-06-30 2026-07-08 $2.57B 637 0001164632-26-000004
2026-03-31 2026-04-13 $2.39B 621 0001164632-26-000002
2025-12-31 2026-01-14 $2.53B 624 0001164632-26-000001
Filer Information
Address
135 S. LASALLE STREET
SUITE 2900
CHICAGO, IL 60603
Phone
(312) 873-1260
Filing Manager
Chesley Taft & Associates LLC
CHICAGO, IL
Signatory
Faris F. Chesley
Manager