BIIB vs GILD
Biogen Inc. (BIIB) and Gilead Sciences, Inc. (GILD) are both filed with the SEC under Biological Products, (No Diagnostic Substances). GILD is 5.6× BIIB's size by market cap ($184.6B against $32.7B); BIIB trades at the higher fiscal-year P/E (25.2× against 22.0×); GILD reports the higher net margin (28.9% against 13.1%); GILD grew sales faster over three years (+2.6% against -0.9%); and over the past year BIIB returned +64.7% against GILD's +31.9%.
| BIIB | GILD | |
|---|---|---|
| Last close | $218.50 | $145.68 |
| Market cap | $32.7B | $184.6B |
| P/E (FY) | 25.2× | 22.0× |
| P/S | 3.3× | 6.3× |
| Operating margin | 28.7% | 34.0% |
| Net margin | 13.1% | 28.9% |
| Return on equity | — | 40.5% |
| Sales growth (3y) | -0.9% | +2.6% |
| EPS growth (3y) | -25.0% | +23.0% |
| Dividend yield | — | 2.2% |
| 1-year return | +64.7% | +31.9% |
Screener snapshot — prices as of 2026-08-28. Each side's last close is the most recent session the snapshot holds for that company, which can be an earlier one, and its 1-year return is measured to that close. Market caps struck on 2026-08-27. Last close, market cap and the 1-year return are price figures; every other row is computed over the company's latest filed fiscal year — FY2025 (ended 2025-12-31) for both. — not published for this company. A ratio goes unpublished for more than one reason: a component the calculation needs is not on file, the filing does not tag the line it is read from, or the calculation is not defined on the filed basis — EV/EBITDA is not printed on non-positive EBITDA, and return on equity is not computed on a zero or negative equity base.
Who holds them, and who has traded them
| BIIB | GILD | |
|---|---|---|
| Institutional holders (13F) | 997 | 2,295 |
| Insider buyers − sellers (180d) | — | -3 |
| Congressional trades disclosed (180d) | 6 | 3 |
| Executive-branch officials on file — trades disclosed (180d) | 3 | 10 |
Counts only. The congressional figures count transactions dated in the trailing 180 days and disclosed in STOCK Act periodic transaction reports; amounts are filed as ranges and are never summed. The executive-branch figures count the same window of transactions, and they are scoped to one roster. The officials OGE posts for direct download. Insider buyers − sellers counts distinct people filing open-market Form 4 purchases minus distinct people filing open-market sales over the trailing 180 days, capped at ±5. — no open-market Form 4 purchases or sales in the window.
BIIB vs GILD: common questions
- Is BIIB bigger than GILD?
- GILD carries the larger market cap — $184.6B against $32.7B, both struck on 2026-08-27.
- Which trades at a higher P/E, BIIB or GILD?
- BIIB, at a fiscal-year 25.2× against 22.0× for GILD. Both are price ÷ latest full-year diluted earnings per share, not a trailing-twelve-month P/E.
- How have BIIB and GILD performed over the past year?
- BIIB returned +64.7% and GILD +31.9%, measured on the trailing calendar year to the last close.
- How many institutions hold BIIB and GILD?
- 997 13F filers report a position in BIIB and 2,295 in GILD, on the latest quarter in the panel.
- Are BIIB and GILD in the same industry?
- Both are filed with the SEC under Biological Products, (No Diagnostic Substances), which is the classification this pairing is built on.
BIIB overview → · GILD overview → · BIIB institutional ownership → · GILD institutional ownership → · Congress and BIIB → · Congress and GILD → · Executive branch and BIIB → · Executive branch and GILD →
More in Biological Products, (No Diagnostic Substances): AMGN vs BIIB · AMGN vs EXEL · AMGN vs GILD · AMGN vs HALO
Stock comparisons lists every pair this site publishes.
Source: SPZCO — https://spzco.com/vs/biib-vs-gild