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PDFS in the 13F filings

PDF Solutions Inc · CUSIP 693282105

Sector · Software and IT servicesTheme · Cloud and enterprise software· L3VLUP-definedTheme · Prepackaged software
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q1 2024Q4 2023Q3 2023Q2 2023Q1 2023Q2 2017Q1 2017Q2 2016Q4 2013
Quarter end
31 Mar 2026
the date the book describes
Filed
18 May 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
13
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 0 listed it in both
Shares listed
1,894,501
combined, among listed positions
Reported value
$62m
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 10 buyers (opened or added shares) and 9 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -79,690.

Managers listing PDFS in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

13 of 13 holders

ActionFiling
Janus Henderson Group Ltd1,035,666$34munder 0.1%Added+123,53118 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)302,209$9.9munder 0.1%Added+35,13415 May 2026 (the filing on sec.gov)
Invesco Ltd144,340$4.7munder 0.1%Added+8,20212 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC130,919$4.3munder 0.1%Trimmed-86,64115 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC50,988$1.7munder 0.1%Trimmed-2,18113 May 2026 (the filing on sec.gov)
AQR Capital Management LLC48,572$1.6munder 0.1%Added+2,34015 May 2026 (the filing on sec.gov)
AllianceBernstein LP44,980$1.3munder 0.1%Added+1,20015 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP38,752$1.3munder 0.1%Added+23,05015 May 2026 (the filing on sec.gov)
Citadel Advisors LLC34,588$1.1munder 0.1%Trimmed-5,26815 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc22,884$749kunder 0.1%Added+3,72815 May 2026 (the filing on sec.gov)
Man Group PLC18,777$614kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC11,583$379kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Caxton Associates LLP10,243$335kunder 0.1%Newnew14 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

There is no earlier quarter on file to compare with.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (3)

Exited (6)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
1 in Q2 2017 to 3 in Q2 2026

Tracked managers listing it, at least.

0123Q4 2013Q2 2016Q1 2017Q2 2017Q1 2023Q2 2023Q3 2023Q4 2023Q1 2024Q1 2026Q2 2026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
PDFS by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20131$1.4mn.a.n.a.
Q2 20161$214kn.a.n.a.
Q1 20171$1.1mn.a.n.a.
Q2 20171$863kn.a.n.a.
Q1 20231$15mn.a.n.a.
Q2 20231$15mn.a.n.a.
Q3 20231$772kn.a.n.a.
Q4 20231$652k01
Q1 20241$664k01
Q1 20261$34m109
Q2 20263$91m158

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

PDFS and GOOGL →PDFS and AMZN →PDFS and MSFT →Choose a stock to compare with PDFS →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own PDFS, latest filings →Back to the 13F Explorer →