Builders FirstSource, Inc. (BLDR) Ownership
BLDR ownership summary
as of October 18, 2026- Institutions
- 101.8% of shares outstanding
- Insiders
- 2.71% of shares outstanding
- Shares outstanding
- 107.6M
- Float
- 104.5M shares available to trade
- Short interest
- 10.17% 14.1M shares short
- Days to cover
- 2.48 short interest up 16.8% vs prior month
- Institutions 101.84%
- Insiders 2.71%
BLDR top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 7.28% | 7.8M | $428.1M | −927,860 (−10.6%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.37% | 6.9M | $374.6M | −172,443 (−2.5%) | June 30, 2026 |
| 3 | State Street Corp | 4.50% | 4.8M | $264.5M | −280,332 (−5.5%) | June 30, 2026 |
| 4 | Vanguard Portfolio Management, LLC | 3.87% | 4.2M | $227.5M | −156,679 (−3.6%) | June 30, 2026 |
| 5 | Capital Research & Mgmt Co - Division 3 | 3.63% | 3.9M | $213.5M | +964,190 (+32.8%) | June 30, 2026 |
| 6 | Pictet Asset Manangement SA | 3.53% | 3.8M | $207.7M | +2.4M (+175.8%) | June 30, 2026 |
| 7 | Wellington Management Company LLP | 3.22% | 3.5M | $189.4M | −214,206 (−5.8%) | June 30, 2026 |
| 8 | Dimensional Fund Advisors, Inc. | 3.20% | 3.4M | $188.0M | +471,535 (+15.9%) | June 30, 2026 |
| 9 | Amvescap Plc. | 3.11% | 3.3M | $182.9M | +742,045 (+28.5%) | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 2.63% | 2.8M | $154.9M | −50,117 (−1.7%) | June 30, 2026 |
| 11 | Coliseum Capital Management LLC | 2.41% | 2.6M | $142.0M | +505,000 (+24.1%) | June 30, 2026 |
| 12 | Brave Warrior Advisors LLC | 2.18% | 2.3M | $127.9M | −31,721 (−1.3%) | June 30, 2026 |
| 13 | Sands Capital Management, LLC | 2.12% | 2.3M | $124.8M | −337,849 (−12.9%) | June 30, 2026 |
| 14 | D1 Capital Partners L.P. | 1.52% | 1.6M | $89.6M | +1.6M (0.0%) | June 30, 2026 |
| 15 | Morgan Stanley - Brokerage Accounts | 1.44% | 1.6M | $84.9M | +139,636 (+9.9%) | June 30, 2026 |
| 16 | Diamond Hill Capital Management, LLC | 1.40% | 1.5M | $82.4M | −256,250 (−14.5%) | June 30, 2026 |
| 17 | The Goldman Sachs Group Inc | 1.29% | 1.4M | $76.1M | −325,005 (−18.9%) | June 30, 2026 |
| 18 | Charles Schwab Investment Management Inc | 1.14% | 1.2M | $66.8M | +100,957 (+9.0%) | June 30, 2026 |
| 19 | Public Sector Pension Investment Board | 1.00% | 1.1M | $58.7M | +12,907 (+1.2%) | June 30, 2026 |
| 20 | Holocene Advisors, LP | 0.99% | 1.1M | $58.3M | +503,988 (+89.5%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 10 holders added 7.5M shares and 10 cut 2.8M.
BLDR top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Small-Cap ETF | 5.96% | 6.4M | $350.3M | +1,371 (+0.0%) | September 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 3.02% | 3.3M | $177.7M | −3,732 (−0.1%) | August 31, 2026 |
| 3 | American Funds Fundamental Invs A | 2.39% | 2.6M | $140.8M | — | September 30, 2026 |
| 4 | Pictet-Clean Energy Transition I USD | 2.39% | 2.6M | $140.5M | −10,937 (−0.4%) | August 31, 2026 |
| 5 | Vanguard Small Cap Index | 2.14% | 2.3M | $125.7M | −51,709 (−2.2%) | September 30, 2026 |
| 6 | Vanguard Windsor Investor Shares | 1.79% | 1.9M | $105.0M | +734,867 (+61.9%) | June 30, 2026 |
| 7 | Vanguard MStar Small Cap Value Index | 1.39% | 1.5M | $81.8M | +4,407 (+0.3%) | September 30, 2026 |
| 8 | Fidelity 500 Index | 1.30% | 1.4M | $76.3M | +5,369 (+0.4%) | August 31, 2026 |
| 9 | American Funds SMALLCAP World A | 0.96% | 1.0M | $56.7M | — | September 30, 2026 |
| 10 | State Street SPDR Port S&P 600 Sm CpETF | 0.91% | 979K | $53.5M | — | September 30, 2026 |
| 11 | iShares S&P Small-Cap 600 Value ETF | 0.85% | 910K | $49.7M | — | September 30, 2026 |
| 12 | Global X US Infrastructure Dev ETF | 0.82% | 884K | $48.3M | +6,300 (+0.7%) | September 30, 2026 |
| 13 | American Funds Growth Fd of Amer A | 0.75% | 808K | $44.2M | +49,592 (+6.5%) | September 30, 2026 |
| 14 | Janus Henderson Contrarian D | 0.72% | 778K | $42.5M | — | August 31, 2026 |
| 15 | State Street® SPDR® S&P® Hmebldr ETF | 0.71% | 762K | $41.7M | +10,244 (+1.4%) | September 30, 2026 |
| 16 | Diamond Hill Long-Short Inv | 0.64% | 690K | $37.7M | +95,542 (+16.1%) | September 30, 2026 |
| 17 | DFA US Targeted Value I | 0.59% | 639K | $34.9M | +21,360 (+3.5%) | August 31, 2026 |
| 18 | MFS Mid Cap Value A | 0.55% | 587K | $32.1M | −6,884 (−1.2%) | August 31, 2026 |
| 19 | iShares US Home Construction ETF | 0.53% | 575K | $31.4M | −9,603 (−1.6%) | September 30, 2026 |
| 20 | State Street® SPDR® S&P 600™ Sm CpValETF | 0.53% | 565K | $30.9M | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
BLDR insider transactions
latest 10| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-30 | Ro Khanna | Sell | $78.81 | — | — |
| 2026-03-13 | Paul S Levy | Buy | $87.73 | 50,000 | $4.4M |
| 2026-02-24 | Ro Khanna | Buy | $109.77 | — | — |
| 2026-01-22 | Ro Khanna | Sell | $125.53 | — | — |
| 2025-08-13 | Ro Khanna | Sell | $144.41 | — | — |
| 2025-05-28 | Ro Khanna | Sell | $107.33 | — | — |
| 2025-05-27 | Dirkson R Charles | Buy | $109.67 | 5,000 | $548,350 |
| 2025-05-19 | Ro Khanna | Sell | $117.45 | — | — |
| 2025-05-08 | Paul S. Levy | Buy | $110.65 | 216,483 | $24.0M |
| 2025-05-08 | Paul S. Levy | Buy | $111.21 | 283,517 | $31.5M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
BLDR shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns BLDR
Institutional investors own 101.8% of Builders FirstSource's shares and insiders 2.71%. The largest holder is BlackRock Inc with 7.28% of the shares (7.8M), as of June 30, 2026. Among the top 20 institutions, 10 added shares and 10 reduced their stake in the latest filings. Short interest is 10.17% of the float, or 2.48 days of average trading volume. The share count rose 11.1% since 2014.
Related: BLDR analyst forecast, BLDR key metrics. See the BLDR stock overview for the latest quote and news.
BLDR ownership FAQ
Who owns the most Builders FirstSource stock?
The largest shareholders of Builders FirstSource are BlackRock Inc (7.28%), Vanguard Capital Management, LLC (6.37%), State Street Corp (4.50%), Vanguard Portfolio Management, LLC (3.87%), Capital Research & Mgmt Co - Division 3 (3.63%).
What percentage of Builders FirstSource is owned by institutions?
Institutions hold 101.8% of Builders FirstSource's shares outstanding; insiders hold 2.71%.
Which funds own Builders FirstSource?
The largest fund holders of Builders FirstSource are iShares Core S&P Small-Cap ETF (5.96%), Vanguard MStar Total Stk Mkt Idx Invest (3.02%), American Funds Fundamental Invs A (2.39%), Pictet-Clean Energy Transition I USD (2.39%), Vanguard Small Cap Index (2.14%).
What is Builders FirstSource's short interest?
14.1M shares of Builders FirstSource were sold short, 10.17% of the float; at the average daily volume it would take 2.48 days to cover.
Are insiders buying or selling Builders FirstSource?
Of the latest 10 reported insider transactions in Builders FirstSource (since May 8, 2025), 5 were purchases and 5 were sales.
How many shares of Builders FirstSource are outstanding?
Builders FirstSource has 107.6M shares outstanding, of which 104.5M are in the public float.