DOSSIER · 13F Holders · Q1 2026Utilities · Electric Services
PNW

PINNACLE WEST CAP CORP

740 institutions still hold PINNACLE WEST CAP CORP as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 723484101·Electric Services·740 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$8.8B
visible holders
Holders
740
filers reporting
Concentration
18.80%
Capital Research Global Investors #1
top holder share
AI Holders Summary · Q1 2026

Assenagon Asset Management held 996,153 shares of Pinnacle West Capital at the start of the quarter — a stake worth roughly $100 million, by far the largest position in the stock at the time. By the end of the quarter, it had sold 813,931 of those shares, an 82% cut that left it holding 182,222 shares worth $19.5 million, roughly $87.1 million in real selling. Assenagon is a fund 13F Insight classifies as quasi-passive, which points to an index mandate change behind the sale rather than a view on the utility specifically. The exit reshuffled the stock's entire ownership picture: Perpetual Ltd, which added modestly this quarter, is now clearly the largest holder at 34.4% of the $189.4 million in institutional value 13F Insight can see, and Arbejdsmarkedets Tillaegspension — a Danish pension fund with no prior stake — opened a brand-new $22.9 million position that instantly ranks second, larger than what Assenagon has left. Commonwealth of Pennsylvania Public School Employees' Retirement System, the third-largest holder, trimmed modestly (down 8.8%). Beyond the reshuffling at the top, buying was broad: CWA Asset Management, Wealth Enhancement Advisory Services, Sequoia Financial Advisors and half a dozen smaller shops all added shares.

Zoom out, and the sale looks less like a single dramatic bet against Pinnacle West and more like a reshuffling of index exposure. Assenagon is a fund 13F Insight's own data classifies as quasi-passive, meaning the sale most likely reflects a mandate or benchmark change rather than a considered view on the utility. What matters more for reading the stock's ownership picture is what it did to the register: Perpetual Ltd, which added a modest 20,421 shares this quarter, is now unambiguously the largest holder at 34.4% of the $189.4 million in institutional value 13F Insight can see — a position that would have been second to Assenagon's a quarter ago.

Filling part of the gap Assenagon left, Arbejdsmarkedets Tillaegspension — a Danish pension fund with no prior position in Pinnacle West — opened a brand-new $22.9 million stake (214,200 shares) that instantly ranks as the second-largest holding in the stock, ahead of what Assenagon has left even after its exit. Commonwealth of Pennsylvania Public School Employees' Retirement System, the third-largest holder at 10.9% of tracked value, trimmed a more modest 8.8% (211,511 down to 192,809 shares).

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Capital Research Global Investors
CIK 0001422848
$1.7B16.4M0.26%Q1 2026
02
BlackRock, Inc.
CIK 0002012383
$1.2B11.8M0.02%Q1 2026
03
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$786M7.8M0.02%Q1 2026
04
BARROW HANLEY MEWHINNEY & STRAUSS LLC
CIK 0000313028
$705M7.0M2.31%Q1 2026
05
STATE STREET CORP
CIK 0000093751
$696M6.9M0.02%Q1 2026
06
Vanguard Portfolio Management
CIK 0002100121· Index
$603M6.0M0.03%Q1 2026
07
Invesco Ltd.
CIK 0000914208
$428M4.3M0.04%Q1 2026
08
ATLAS Infrastructure Partners (UK) Ltd.
CIK 0001924953
$396M4.5M19.84%Q4 2025
09
Soroban Capital Partners LP
CIK 0001517857
$388M3.9M0.75%Q1 2026
10
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$315M3.1M0.02%Q1 2026
11
MASSACHUSETTS FINANCIAL SERVICES CO /MA/
CIK 0000912938
$287M2.8M0.10%Q1 2026
12
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$220M2.2M0.18%Q1 2026
13
MORGAN STANLEY
CIK 0000895421
$208M2.1M0.01%Q1 2026
14
GOLDMAN SACHS GROUP INC
CIK 0000886982
$158M1.6M0.02%Q1 2026
15
TWO SIGMA ADVISERS, LP
CIK 0001478735
$147M1.7M0.29%Q4 2025
16
Pictet Asset Management Holding SA
CIK 0001993888
$143M1.4M0.15%Q1 2026
17
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$136M1.3M0.03%Q1 2026
18
Squarepoint Ops LLC
CIK 0001642575
$124M1.2M0.15%Q1 2026
19
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$116M1.1M0.02%Q1 2026
20
Bank of New York Mellon Corp
CIK 0001390777
$110M1.1M0.02%Q1 2026
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Insiders at PINNACLE WEST CAP CORP
Spence William HSims Paula JTrevathan James E JrFlanagan Susan T.De La Melena Gonzalo A JrTetlow JacobHeflin Adam CBlankenship Elizabeth A