L3VLUP
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
33
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 2 listed it in both
Shares listed
4,480,691
combined, among listed positions
Reported value
$175m
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: 21 buyers (opened or added shares) and 14 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +187,112.

Managers listing BLKB 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.

33 of 33 holders

ActionFiling
Janus Henderson Group Ltd1,555,833$60munder 0.1%Added+58,80618 May 2026 (the filing on sec.gov)
AQR Capital Management LLC347,327$13munder 0.1%Trimmed-420,46515 May 2026 (the filing on sec.gov)
Jane Street Group LLC317,738$12munder 0.1%Added+117,47912 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP312,992$12munder 0.1%Added+104,66314 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)224,024$8.7munder 0.1%Added+43,23615 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC178,829$6.9munder 0.1%Added+77,00015 May 2026 (the filing on sec.gov)
Two Sigma Investments LP162,049$6.3munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Point72 Asset Management LP160,569$6.2munder 0.1%Added+91,83215 May 2026 (the filing on sec.gov)
Citadel Advisors LLC151,895$5.9munder 0.1%Trimmed-77,02215 May 2026 (the filing on sec.gov)
Millennium Management LLC129,538$5.0munder 0.1%Trimmed-4,06515 May 2026 (the filing on sec.gov)
Invesco Ltd127,152$4.9munder 0.1%Added+21,08212 May 2026 (the filing on sec.gov)
AllianceBernstein LP76,617$4.9munder 0.1%Trimmed-21815 May 2026 (the filing on sec.gov)
Man Group PLC112,233$4.3munder 0.1%Trimmed-3,45815 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP98,253$3.8munder 0.1%Added+82,35915 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.89,394$3.5munder 0.1%Trimmed-28,00415 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC56,720$2.2munder 0.1%Added+39,33215 May 2026 (the filing on sec.gov)
Tudor Investment Corp45,870$1.8munder 0.1%Trimmed-42,18115 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP45,662$1.8munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc43,734$1.7munder 0.1%Added+5,32115 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC34,997$1.4munder 0.1%Newnew14 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC33,369$1.3munder 0.1%Added+29,62515 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC31,869$1.2munder 0.1%Added+6,67613 May 2026 (the filing on sec.gov)
Marshall Wace LLP19,577$756kunder 0.1%Trimmed-143,53715 May 2026 (the filing on sec.gov)
Hudson Bay Capital Management LP19,222$742kunder 0.1%Newnew13 May 2026 (the filing on sec.gov)
Winton Group Ltd19,112$738kunder 0.1%Trimmed-52,47212 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

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

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.
2 in Q3 2024 to 1 in Q2 2026

Tracked managers listing it, at least.

02468201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
BLKB by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20131$56mn.a.n.a.
Q3 20131$66mn.a.n.a.
Q4 20131$35mn.a.n.a.
Q4 20141$9.0mn.a.n.a.
Q1 20153$91mn.a.n.a.
Q2 20153$110mn.a.n.a.
Q3 20154$106mn.a.n.a.
Q4 20154$111mn.a.n.a.
Q1 20163$65mn.a.n.a.
Q2 20164$119mn.a.n.a.
Q3 20163$109mn.a.n.a.
Q4 20163$215mn.a.n.a.
Q1 20174$307mn.a.n.a.
Q2 20174$667mn.a.n.a.
Q3 20175$645mn.a.n.a.
Q4 20175$666mn.a.n.a.
Q1 20188$843mn.a.n.a.
Q2 20185$785mn.a.n.a.
Q3 20185$893mn.a.n.a.
Q4 20185$553mn.a.n.a.
Q1 20195$790mn.a.n.a.
Q2 20194$845mn.a.n.a.
Q3 20194$899mn.a.n.a.
Q4 20195$768mn.a.n.a.
Q1 20207$457mn.a.n.a.
Q2 20206$453mn.a.n.a.
Q3 20206$434mn.a.n.a.
Q4 20203$327mn.a.n.a.
Q1 20212$230mn.a.n.a.
Q2 20212$243mn.a.n.a.
Q3 20211$220mn.a.n.a.
Q4 20212$251mn.a.n.a.
Q1 20222$172mn.a.n.a.
Q2 20222$174mn.a.n.a.
Q3 20222$139mn.a.n.a.
Q4 20223$186mn.a.n.a.
Q1 20232$215mn.a.n.a.
Q2 20234$199mn.a.n.a.
Q3 20231$194mn.a.n.a.
Q4 20231$242m10
Q1 20241$211m10
Q2 20241$217m10
Q3 20242$245m20
Q4 20241$213m10
Q1 20251$132m01
Q2 20253$116m21
Q3 20252$101m02
Q4 20253$100m1417
Q1 20261$60m2114
Q2 20261$47m1420

Compare with…

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

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

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 BLKB, latest filings →Back to the 13F Explorer →