Which funds own BLDR
Builders Firstsource Inc in the Q2 2026 filings. At least 3 of the 91 current managers on file reported a position, worth $255m between them. It is among the largest positions of fewer than a fifth of the current managers on file. The quarter went the other way: 6 managers trimmed or sold out against 2 buying.
- Managers holding
- 3
- at least, of 91 current
- Combined value
- $255m
- as reported
- Opened
- 1
- new this quarter
- Added to
- 1
- already held
- Trimmed or sold out
- 6
- 5 sold out entirely
Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.
Managers reporting a position
Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.
| Manager | Value | Weight | Shares | Change on the quarter | Action |
|---|---|---|---|---|---|
| D1 Capital Partners LP Long/short equity · $34.8bn book | $147m | 0.4% | 1,639,222 | opened1,639,222 | New |
| Holocene Advisors LP Long/short equity · $44.4bn book | $96m | 0.2% | 1,066,869 | +$49m+503,988 | Added |
| Moore Capital Management LP Macro · $6.7bn book | $13m | 0.2% | 139,385 | -$7.4m-102,408 | Trimmed |
Sold out of this quarter
Valued at what the position was worth in the previous filing, because by this one it is gone.
- Balyasny Asset Management LLC · Multi-strategy$19m held before
- Verition Fund Management LLC · Multi-strategy$19m held before
- Renaissance Technologies LLC · Quantitative$18m held before
- Brevan Howard Capital Management LP · Macro$3.6m held before
- Soros Fund Management LLC · Macro$200k held before
Ownership through time
At least 12 of the 95 managers whose filings are on file listed BLDR in Q2 2026, against 1 in Q4 2013. 2 managers fewer than in Q1 2026: 3 started positions; 2 listed it again; 2 sold out, by their own filings; 5 no longer listed it among the positions read, which can mean a holding below the listed range or a filing not yet made.
Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.
- Q4 2013: 1
- Q2 2015: 1
- Q3 2015: 3
- Q4 2015: 1
- Q1 2016: 2
- Q2 2016: 4
- Q3 2016: 3
- Q4 2016: 1
- Q1 2017: 6
- Q2 2017: 3
- Q3 2017: 6
- Q4 2017: 5
- Q1 2018: 9
- Q2 2018: 2
- Q3 2018: 5
- Q4 2018: 2
- Q1 2019: 4
- Q2 2019: 5
- Q3 2019: 6
- Q4 2019: 11
- Q1 2020: 8
- Q2 2020: 7
- Q3 2020: 9
- Q4 2020: 6
- Q1 2021: 9
- Q2 2021: 13
- Q3 2021: 11
- Q4 2021: 18
- Q1 2022: 18
- Q2 2022: 13
- Q3 2022: 14
- Q4 2022: 14
- Q1 2023: 18
- Q2 2023: 20
- Q3 2023: 17
- Q4 2023: 24
- Q1 2024: 20
- Q2 2024: 18
- Q3 2024: 19
- Q4 2024: 15
- Q1 2025: 15
- Q2 2025: 17
- Q3 2025: 12
- Q4 2025: 14
- Q1 2026: 14
- Q2 2026: 12
- Q4 2013: $78k
- Q2 2015: $12m
- Q3 2015: $4.3m
- Q4 2015: $3.8m
- Q1 2016: $13m
- Q2 2016: $78m
- Q3 2016: $59m
- Q4 2016: $55m
- Q1 2017: $118m
- Q2 2017: $118m
- Q3 2017: $175m
- Q4 2017: $144m
- Q1 2018: $222m
- Q2 2018: $109m
- Q3 2018: $128m
- Q4 2018: $95m
- Q1 2019: $127m
- Q2 2019: $42m
- Q3 2019: $115m
- Q4 2019: $301m
- Q1 2020: $136m
- Q2 2020: $165m
- Q3 2020: $128m
- Q4 2020: $430m
- Q1 2021: $1.4bn
- Q2 2021: $1.6bn
- Q3 2021: $1.9bn
- Q4 2021: $3.1bn
- Q1 2022: $2.2bn
- Q2 2022: $1.5bn
- Q3 2022: $2.0bn
- Q4 2022: $1.9bn
- Q1 2023: $2.7bn
- Q2 2023: $3.0bn
- Q3 2023: $2.6bn
- Q4 2023: $3.4bn
- Q1 2024: $3.9bn
- Q2 2024: $2.6bn
- Q3 2024: $4.7bn
- Q4 2024: $3.1bn
- Q1 2025: $2.9bn
- Q2 2025: $2.6bn
- Q3 2025: $2.4bn
- Q4 2025: $713m
- Q1 2026: $777m
- Q2 2026: $941m
Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.
Started in Q2 2026
Largest increases, by shares
- D1 Capital Partners LPnew: 1,639,222 shares+$147m
- Capital Research Global Investorsnew: 593,700 shares+$53m
- Holocene Advisors LP562,881 to 1,066,869 shares+$45m
- Capital World Investors779,198 to 1,005,583 shares+$20m
- Janus Henderson Group Ltd688,745 to 826,290 shares+$12m
Largest decreases, by shares
- Wellington Management Group LLP3,679,457 to 3,465,251 shares-$19m
- MFS Investment Management1,018,615 to 809,251 shares-$19m
- Moore Capital Management LP241,793 to 139,385 shares-$9.2m
- Artisan Partners LP2,920 to 2,900 shares-$2k
Left it
- Verition Fund Management LLCwas $19m
- Soros Fund Management LLCwas $219k
| Manager | Value over time | First listed | Largest | Q2 2026 |
|---|---|---|---|---|
| Wellington Management Group LLP | Q1 2021 | $1.4bn | $310m | |
| D1 Capital Partners LP | Q2 2026 | $147m | $147m | |
| Holocene Advisors LP | Q3 2018 | $95m | $95m | |
| Capital World Investors | Q1 2021 | $159m | $90m | |
| Arrowstreet Capital LP | Q1 2018 | $98m | $82m | |
| Janus Henderson Group Ltd | Q1 2025 | $100m | $74m | |
| MFS Investment Management | Q1 2021 | $292m | $72m | |
| Capital Research Global Investors | Q3 2024 | $182m | $53m | |
| Moore Capital Management LP | Q4 2021 | $26m | $12m | |
| Bridgewater Associates LP | Q2 2022 | $37m | $4.6m | |
| Artisan Partners LP | Q3 2025 | $298k | $259k | |
| First Eagle Investment Management LLC | Q2 2026 | $15k | $15k | |
| Fidelity (FMR LLC) | Q4 2020 | $2.0bn | last listed Q3 2025 | |
| Invesco Ltd | Q1 2018 | $432m | last listed Q1 2025 | |
| AllianceBernstein LP | Q3 2022 | $369m | last listed Q2 2025 | |
| Baillie Gifford & Co | Q3 2024 | $267m | last listed Q3 2025 | |
| AQR Capital Management LLC | Q2 2021 | $200m | last listed Q4 2024 | |
| Millennium Management LLC | Q1 2021 | $155m | last listed Q3 2024 | |
| Ruane Cunniff & Goldfarb LP | Q2 2016 | $116m | last listed Q1 2025 | |
| Man Group PLC | Q1 2018 | $110m | last listed Q4 2024 | |
| Renaissance Technologies LLC | Q3 2019 | $105m | last listed Q4 2025 | |
| Balyasny Asset Management LLC | Q1 2016 | $103m | last listed Q1 2024 |
What BLDR is worth
Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.
Build the comp set around BLDR →How much of the picture this is
A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.
What to do with a name the funds are buying
Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.
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The holdings, every quarter, and the week between
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