L3VLUP
ProSign in

BLDR in the 13F filings

Builders Firstsource Inc · CUSIP 12008R107

Sector · Consumer discretionary
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
30 Sep 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 29 Oct 2025
Managers listing it
12
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q2 2025 and Q3 2025; 10 listed it in both
Shares listed
19,704,117
combined, among listed positions
Reported value
$2.4bn
combined, at the quarter end

Among the 95 comparable managers: 5 buyers (opened or added shares) and 8 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing BLDR in Q3 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

12 of 12 holders

ActionFiling
Fidelity (FMR LLC)11,405,266$1.4bn0.07%Trimmed-221,71213 Nov 2025 (the filing on sec.gov)
Wellington Management Group LLP3,242,962$393m0.07%Trimmed-140,84114 Nov 2025 (the filing on sec.gov)
Baillie Gifford & Co1,469,801$178m0.13%Trimmed-54,48131 Oct 2025 (the filing on sec.gov)
MFS Investment Management1,101,986$134munder 0.1%Trimmed-454,16529 Oct 2025 (the filing on sec.gov)
Capital World Investors768,520$93munder 0.1%Added+8,29213 Nov 2025 (the filing on sec.gov)
Neuberger Berman Group LLC713,569$87m0.06%Added+274,58327 Oct 2026 (the filing on sec.gov)
Janus Henderson Group Ltd674,266$82munder 0.1%Trimmed-184,99214 Nov 2025 (the filing on sec.gov)
Moore Capital Management LP135,804$16m0.23%Trimmed-83,98614 Nov 2025 (the filing on sec.gov)
Verition Fund Management LLC120,705$15m0.06%Addedn.a.14 Nov 2025 (the filing on sec.gov)
Hudson Bay Capital Management LP56,146$6.8munder 0.1%Added+64715 Dec 2025 (the filing on sec.gov)
Winton Group Ltd13,131$1.6m0.06%Trimmed-18,54313 Nov 2025 (the filing on sec.gov)
Artisan Partners LP1,961$238kunder 0.1%Newnew12 Nov 2025 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2025 to Q3 2025, 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.

New (1)

Exited (1)

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.
19 in Q3 2024 to 12 in Q2 2026

Tracked managers listing it, at least.

0102030201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
BLDR by quarter
QuarterHoldersReported valueBuyersSellers
Q4 20131$78kn.a.n.a.
Q2 20151$12mn.a.n.a.
Q3 20153$4.3mn.a.n.a.
Q4 20151$3.8mn.a.n.a.
Q1 20162$13mn.a.n.a.
Q2 20164$78mn.a.n.a.
Q3 20163$59mn.a.n.a.
Q4 20161$55mn.a.n.a.
Q1 20176$118mn.a.n.a.
Q2 20173$118mn.a.n.a.
Q3 20176$175mn.a.n.a.
Q4 20175$144mn.a.n.a.
Q1 20189$222mn.a.n.a.
Q2 20182$109mn.a.n.a.
Q3 20185$128mn.a.n.a.
Q4 20182$95mn.a.n.a.
Q1 20194$127mn.a.n.a.
Q2 20195$42mn.a.n.a.
Q3 20196$115mn.a.n.a.
Q4 201911$301mn.a.n.a.
Q1 20208$136mn.a.n.a.
Q2 20207$165mn.a.n.a.
Q3 20209$128mn.a.n.a.
Q4 20206$430mn.a.n.a.
Q1 20219$1.4bnn.a.n.a.
Q2 202113$1.6bnn.a.n.a.
Q3 202111$1.9bnn.a.n.a.
Q4 202118$3.1bnn.a.n.a.
Q1 202218$2.2bnn.a.n.a.
Q2 202213$1.5bnn.a.n.a.
Q3 202214$2.0bnn.a.n.a.
Q4 202214$1.9bnn.a.n.a.
Q1 202318$2.7bnn.a.n.a.
Q2 202320$3.0bnn.a.n.a.
Q3 202317$2.6bnn.a.n.a.
Q4 202324$3.4bn1310
Q1 202420$3.9bn513
Q2 202418$2.6bn117
Q3 202419$4.7bn118
Q4 202415$3.1bn89
Q1 202515$2.9bn94
Q2 202517$2.6bn125
Q3 202512$2.4bn58
Q4 202514$713m2612
Q1 202614$777m2018
Q2 202612$941m2019

Compare with…

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

BLDR and AMZN →BLDR and TSLA →BLDR and HD →Choose a stock to compare with BLDR →

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