Information Technology · Electronic Coils, Transformers & Other Inductors · Nasdaq · CIK 729580 · FYE Dec 31 · Prices AT CLOSE 2026-08-21 (USD) Last $255.46 · Day −2.66% · Mkt cap $3.5B · 1Y +98.4% · Off 52W high −23.8% · Vol (1Y) 54.0% Price2023-08-21 → 2026-08-21 BELFB close: $48 on 2023-08-21 to $255 on 2026-08-21. Split-adj closes · 240 of 5,310 · price returnⓘ At a glance | Short interest5.7% of sh out | | Days to cover2.6d | | 13F net flow (QoQ)+0.76% | | Top-10 13F concentration52.7% | | Next report (est.)2026-10-28 |
SI 2026-07-31 · 13F 2026-Q1ⓘ Key fundamentalsFY 2025 | Sales (TTM)$744.1M | | Earnings (TTM)$61.5M | | ROE15.7% | | Net margin9.1% | | ROIC15.1% | | Debt / equity0.46× | | Total debt / EBITDA1.44× | | Sales growth 3Y1.1% |
FY ratios · TTM sales/earnings (USD)ⓘ Trailing returns | YTD+50.7% | | 1Y+98.4% | | 3Y+436.5% | | 5Y+1838.1% | | 10Y+1192.2% | | Since incept. (ann.)+11.8% |
Total return · from 2005-07-11ⓘ Risk | Ann. volatility (1Y)54.0% | | Ann. volatility (3Y)51.9% | | Sharpe (1Y)1.57 | | Sharpe (3Y)1.35 | | Max drawdown (1Y)−27.2% | | Max drawdown (3Y)−33.4% | | Beta (3Y vs SPY)1.54 |
Daily returns, ann.ⓘ Top institutional holders13F 2026-Q1 | Manager | Shares | Value | % sh out | QoQ |
|---|
| BlackRock, Inc. | 846,920 | $168M | 6.16% | −2.2% | | PRICE T ROWE ASSOCIATES INC /MD/ | 773,475 | $153M | 5.62% | −7.3% | | JANUS HENDERSON GROUP PLC | 760,141 | $151M | 5.53% | +22.7% | | FMR LLC | 631,307 | $125M | 4.59% | −5.4% | | T. Rowe Price Investment Management, Inc. | 572,919 | $113M | 4.17% | −3.9% | | VANGUARD CAPITAL MANAGEMENT LLC | 489,081 | $97M | 3.56% | new | | WASATCH ADVISORS LP | 478,709 | $95M | 3.48% | +16.6% | | VANGUARD PORTFOLIO MANAGEMENT LLC | 329,461 | $65M | 2.40% | new |
Δ vs 2025-Q4ⓘ Latest reported quarterslast report 2026-07-29 | Period end | Reported | EPS | EPS YoY | Revenue | Rev YoY |
|---|
| 2026-06-30 | 2026-07-29 | — | — | $210.7M | +25.2% | | 2026-03-31 | 2026-04-29 | — | — | $178.5M | +17.2% | | 2025-12-31 | 2026-02-17 | — | — | $175.9M | +17.4% | | 2025-09-30 | 2025-10-29 | — | — | $179.0M | +44.8% |
As-reported XBRL · next 2026-10-28 est.ⓘ Segment mixFY2025 (ended Dec 2025) Power Solutions And Protection 53% · Connectivity Solutions 34% · Magnetic Solutions 13% business · TAGGED revenueⓘ Basis & disclosures - EOD closes · nothing imputed or averaged · absent “—”
- As-of differs by block · 13F = US long, 45+d lag, LOWER bound
- Not investment advice · no recommendation, price target or solicitation
- EDGAR + foreign registers · marketstack (licensed EOD) · spzco.com/methodology
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