# INSMED INC (INSM) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 457669307
Page URL: https://superinvestorclub.com/stock/INSM
Last updated: 2026-08-29T13:47:16.619Z

## Summary

As of the most recent 13F filing period, INSMED INC (INSM) is held by 4 tracked superinvestors with an aggregate position value of $573.7M representing 0215076214246901350000455392 shares.

## Top institutional holders (4)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Lee Ainslie](https://superinvestorclub.com/manager/58) | Maverick Capital | 2150762 | $229.3M | 2.03% | 2026-06-30 |
| 2 | [Stanley Druckenmiller](https://superinvestorclub.com/manager/19) | Duquesne Family Office | 1424690 | $151.9M | 2.92% | 2026-06-30 |
| 3 | [Stanley Druckenmiller](https://superinvestorclub.com/manager/19) | Duquesne Family Office | 1350000 | $143.9M | 2.76% | 2026-06-30 |
| 4 | [Ray Dalio](https://superinvestorclub.com/manager/6) | Bridgewater Associates | 455392 | $48.6M | 0.20% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2024-06-30: 2 holders, $70.7M aggregate, 0103597020000 shares
- 2024-09-30: 1 holders, $1.5M aggregate, 020000 shares
- 2024-12-31: 1 holders, $41.0M aggregate, 0593470 shares
- 2025-03-31: 2 holders, $136.9M aggregate, 01369050425125 shares
- 2025-06-30: 3 holders, $317.8M aggregate, 02253435804133100000 shares
- 2025-09-30: 2 holders, $443.5M aggregate, 02423435656539 shares
- 2025-12-31: 1 holders, $257.9M aggregate, 01481752 shares
- 2026-03-31: 2 holders, $237.1M aggregate, 01154090295579 shares
- 2026-06-30: 4 holders, $573.7M aggregate, 0215076214246901350000455392 shares

## Recent congressional trades (11)

- 2026-06-10: Josh Gottheimer (Democrat-NJ) sale $1,001 - $15,000
- 2025-10-03: Gil Cisneros (Democrat-CA) sale $1,001 - $15,000
- 2025-10-03: Gilbert Cisneros (D-CA) sale $1,001 - $15,000
- 2025-09-22: Gilbert Cisneros (D-CA) sale $1,001 - $15,000
- 2025-08-08: Gilbert Cisneros (D-CA) sale $1,001 - $15,000
- 2025-08-08: Gil Cisneros (Democrat-CA) sale $1,001 - $15,000
- 2025-07-07: Gil Cisneros (Democrat-CA) sale $1,001 - $15,000
- 2025-07-07: Gilbert Cisneros (D-CA) sale $1,001 - $15,000
- 2025-06-16: Josh Gottheimer (Democrat-NJ) purchase $1,001 - $15,000
- 2025-06-16: Josh Gottheimer (Democrat-NJ) purchase $1,001 - $15,000
- 2025-04-09: Josh Gottheimer (Democrat-NJ) sale $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "INSMED INC (INSM) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/INSM), aggregating SEC 13F, Form 4, and congressional disclosures."