XOOMAR

INSMED Inc (INSM)

Every FINRA and SEC series the site collects for INSMED Inc: short interest with days to cover, daily short sale volume, fails to deliver and Form 4 insider trades. Listed on Nasdaq, classified by the SEC as pharmaceutical preparations.

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10.9M

Short interest

settlement 2026-08-14

2.7

Days to cover

-4.0% vs prior

50.0%

Short share of volume

2026-09-11

112

Fails to deliver

settlement 2026-08-06

-$39.2M

Insider flow, 90 days

0 buys, 5 sells

As of 2026-09-11.

Short interest

FINRA, twice a month; the last 12 months shown, all 48 settlements in the JSON

As of 14 August 2026, short interest in INSM is 10,892,278 shares, down 732,478 shares over the last month. Over the last 48 readings it ranged from 8,033,501 shares (31 October 2025) to 19,132,984 shares (29 May 2026). At the reported average volume of 4.1M shares a day that is 2.7 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-08-1410,892,278-4.0%4,091,9872.66
2026-07-3111,350,580-2.4%2,207,6505.14
2026-07-1511,624,756-27.5%2,440,5984.76
2026-06-3016,030,053-14.0%5,800,4432.76
2026-06-1518,647,626-2.5%4,164,0714.48
2026-05-2919,132,984+8.7%3,132,3996.11
2026-05-1517,606,497+19.7%5,214,3923.38
2026-04-3014,709,273+6.2%1,581,2639.30
2026-04-1513,855,201+0.7%1,988,7566.97
2026-03-3113,756,534+37.0%2,950,8314.66
2026-03-1310,037,946-11.0%1,900,4815.28
2026-02-2711,279,030-1.8%2,563,8464.40
2026-02-1311,489,389-1.8%2,178,0165.28
2026-01-3011,703,014-1.6%2,459,1164.76
2026-01-1511,887,857+7.9%2,819,7964.22
2025-12-3111,015,687+23.4%4,718,9212.33
2025-12-158,927,430-9.5%2,382,7513.75
2025-11-289,866,791+10.5%3,498,5652.82
2025-11-148,927,374+11.1%2,074,5084.30
2025-10-318,033,501-15.3%2,281,2583.52
2025-10-159,481,459-11.6%1,915,9034.95
2025-09-3010,727,695+1.4%2,288,1874.69
2025-09-1510,575,467+0.1%2,176,7734.86
2025-08-2910,563,132+0.6%2,224,2814.75

Daily short volume

FINRA Reg SHO, last 60 sessions. JSON

As of 11 September 2026, the short share of INSM volume is 50.0%, up 2.5 points over the last five sessions. Over the last 52 readings it ranged from 17.1% (5 August 2026) to 62.7% (9 September 2026). The latest reading is 9.2 points above the 30-session average of 40.8%, on 678K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-09-11339K678K50.0%580
2026-09-10428K776K55.1%0
2026-09-09661K1.1M62.7%34,379
2026-09-08327K684K47.8%3,101
2026-09-04268K666K40.3%6,106
2026-09-03439K924K47.5%132
2026-09-02379K958K39.6%0
2026-09-01264K545K48.4%427
2026-08-31403K737K54.7%0
2026-08-28349K780K44.7%46
2026-08-27204K432K47.3%911
2026-08-26292K625K46.8%0
2026-08-25341K591K57.6%9,050
2026-08-24220K528K41.6%700
2026-08-21185K409K45.2%200
2026-08-20212K846K25.0%604
2026-08-19258K571K45.3%0
2026-08-18204K476K43.0%0
2026-08-17256K727K35.1%0
2026-08-14272K923K29.4%3
2026-08-13254K1.0M25.2%1,922
2026-08-12185K628K29.5%0
2026-08-11430K998K43.1%0
2026-08-10736K1.6M47.3%0
2026-08-071.1M2.4M45.7%35,956
2026-08-062.2M5.0M43.3%1,113
2026-08-05336K2.0M17.1%141
2026-08-04424K2.0M21.1%0
2026-08-03276K1.6M17.6%467
2026-07-31379K1.3M28.3%20

Fails to deliver

SEC, by settlement date. JSON

As of 6 August 2026, the fails-to-deliver balance in INSM is 112 shares, down 1,258 shares over the last settlement date. Over the last 52 readings it ranged from 1 share (6 January 2026) to 139,933 shares (20 April 2026). The latest reading sits at the bottom of that range.

SettlementShares failedPriceValue
2026-08-06112$99.02$11K
2026-08-031,370$98.60$135K
2026-07-301$103.12$103
2026-07-17407$107.46$44K
2026-07-139,169$115.61$1.1M
2026-07-01297$106.62$32K
2026-06-29434$103.38$45K
2026-06-262,267$104.47$237K
2026-06-25166$103.46$17K
2026-06-2296$95.80$9K
2026-06-185$98.45$492
2026-06-15105$97.85$10K
2026-06-1143$91.88$4K
2026-06-089,904$94.22$933K
2026-06-0448$103.86$5K
2026-04-20139,933$144.48$20.2M
2026-04-163$146.74$440
2026-04-09358$160.18$57K
2026-04-066$162.43$975
2026-03-237$136.00$952
2026-03-10206$143.13$29K
2026-03-0410$147.00$1K
2026-03-0367$146.32$10K
2026-02-2741$150.00$6K
2026-02-262,007$148.61$298K
2026-02-23421$164.91$69K
2026-02-19922$151.11$139K
2026-02-1862$150.52$9K
2026-02-1211,161$148.43$1.7M
2026-02-111,791$148.55$266K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

Insiders at INSM reported 5 open-market sells worth $39.2M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Brennan David R on 2026-09-09.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-09-09Brennan David Rn/aSell25K$124.00$3.1M39K
2026-08-17SHAROKY MELVIN MDn/aSell5K$127.53$638K0
2026-08-10Adsett RogerChief Operating OfficerSell240K$133.27$32.0M99K
2026-08-10Adsett RogerChief Operating OfficerOption exercise81K$30.46$2.5M339K
2026-08-10Adsett RogerChief Operating OfficerOption exercise77K$17.16$1.3M258K
2026-08-10Adsett RogerChief Operating OfficerOption exercise82K$13.67$1.1M181K
2026-08-06Flammer Martina M.D.Chief Medical OfficerSell18K$129.40$2.4M60K
2026-08-06Flammer Martina M.D.Chief Medical OfficerSell9K$127.00$1.1M79K
2026-08-06Flammer Martina M.D.Chief Medical OfficerOption exercise9K$25.83$230K88K
2026-08-06Flammer Martina M.D.Chief Medical OfficerOption exercise18K$18.95$346K79K
2026-06-08Lewis WilliamChair and CEOSell7K$94.03$613K259K
2026-06-05Flammer Martina M.D.Chief Medical OfficerSell2K$103.78$193K60K
2026-06-03Smith Michael AlexanderChief Legal OfficerSell2K$102.27$221K39K
2026-06-03Lewis WilliamChair and CEOSell8K$102.27$778K265K
2026-06-03Flammer Martina M.D.Chief Medical OfficerSell3K$102.27$262K62K
2026-06-03Bonstein SaraChief Financial OfficerSell2K$102.27$246K69K
2026-06-03Adsett RogerChief Operating OfficerSell2K$102.27$242K99K
2026-05-22Smith Michael AlexanderChief Legal OfficerSell6K$108.47$667K42K
2026-05-18Lewis WilliamChair and CEOSell8K$106.97$853K273K
2026-05-18Lewis WilliamChair and CEOSell12K$106.39$1.3M281K
2026-05-18Lewis WilliamChair and CEOSell6K$105.32$606K293K
2026-05-18Lewis WilliamChair and CEOOption exercise4K$17.16$76K299K
2026-05-18Lewis WilliamChair and CEOOption exercise6K$30.46$191K294K
2026-05-14Flammer Martina M.D.Chief Medical OfficerSell10K$117.54$1.2M65K
2026-05-13Smith Michael AlexanderChief Legal OfficerSell4K$116.18$477K48K
2026-05-13Lewis WilliamChair and CEOSell13K$116.18$1.5M288K
2026-05-13Flammer Martina M.D.Chief Medical OfficerSell3K$116.18$393K75K
2026-05-13Flammer Martina M.D.Chief Medical OfficerSell4K$112.76$504K79K
2026-05-13Bonstein SaraChief Financial OfficerSell8K$116.18$961K71K
2026-05-13Adsett RogerChief Operating OfficerSell6K$116.18$678K101K
2026-05-11Flammer Martina M.D.Chief Medical OfficerSell830$101.18$84K83K
2026-05-11Flammer Martina M.D.Chief Medical OfficerSell12K$100.35$1.2M84K
2026-05-11Flammer Martina M.D.Chief Medical OfficerOption exercise13K$17.07$221K96K
2026-05-04Lewis WilliamChair and CEOSell381$139.60$53K301K
2026-05-04Lewis WilliamChair and CEOSell1K$139.09$173K302K
2026-05-04Lewis WilliamChair and CEOSell3K$137.86$375K303K
2026-05-04Lewis WilliamChair and CEOSell5K$137.01$729K306K
2026-05-04Lewis WilliamChair and CEOSell599$135.18$81K311K
2026-05-04Lewis WilliamChair and CEOSell433$134.18$58K311K
2026-05-04Lewis WilliamChair and CEOOption exercise4K$17.16$76K312K
2026-05-04Lewis WilliamChair and CEOOption exercise6K$30.46$191K307K
2026-04-16Lewis WilliamChair and CEOSell825$145.79$120K301K
2026-04-16Lewis WilliamChair and CEOSell2K$144.66$326K302K
2026-04-16Lewis WilliamChair and CEOSell5K$143.81$773K304K
2026-04-16Lewis WilliamChair and CEOSell2K$142.99$321K310K
2026-04-16Lewis WilliamChair and CEOOption exercise4K$17.16$76K312K
2026-04-16Lewis WilliamChair and CEOOption exercise6K$30.46$191K307K
2026-04-06Lewis WilliamChair and CEOSell1K$164.01$235K301K
2026-04-06Lewis WilliamChair and CEOSell8K$163.23$1.4M303K
2026-04-06Lewis WilliamChair and CEOSell787$161.73$127K311K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are the rarer, stronger signal.

Planned sales (Form 144)

Newest first. JSON

1 Form 144 notice on file for INSM worth $3.1M at the prices reported; 1 in the last 90 days worth $3.1M. Latest: Brennan David R filed on 2026-09-10 to sell 25,000 shares ($3.1M) from 2026-09-09.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-09-10Brennan David RDirector25K$3.1M0.011%2026-09-09Wells Fargo Clearing Services

13F holders

Tracked managers holding INSM at their latest 13F. JSON

8 of the 30 tracked managers held INSM at their latest 13F, $1.89B in total at quarter-end prices. D. E. Shaw & Co. is the largest at $633.1M (0.3% of its portfolio) as of 2026-06-30. Over the prior quarter 7 added shares and 1 cut.

FundQuarterSharesValueOf portfolioChange in shares
D. E. Shaw & Co.2026-06-305.9M$633.1M0.30%+295K
Citadel Advisors2026-06-303.2M$339.9M0.04%+575K
Millennium Management2026-06-302.9M$312.2M0.11%+1.6M
Duquesne Family Office2026-06-302.8M$295.8M5.68%+1.6M
Two Sigma Investments2026-06-301.3M$133.3M0.10%+1.0M
AQR Capital Management2026-06-30613K$65.3M0.02%-63K
Point72 Asset Management2026-06-30539K$57.5M0.06%+500K
Bridgewater Associates2026-06-30455K$48.6M0.20%+160K

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

Financials

SEC XBRL, as filed. JSON

In Q2 2026 (quarter ended 2026-06-30) INSMED Inc reported revenue of $425.5M, up 296.1% from the same quarter a year earlier, and net loss of $13.2M (-0.06 diluted EPS). In FY 2025 it generated -$935.0M of operating cash flow. As of 2026-06-30, cash was $544.8M against $546.8M of debt.

Cash
$544.8M
Debt
$546.8M
Equity
$757.5M
Total assets
$2.10B
Shares outstanding
218,381,503

Quarterly, last 8 quarters

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q2 20262026-06-30$425.5M-$13.2M-3.1%-0.06
Q1 20262026-03-31$306.0M-$163.6M-53.5%-0.76
Q4 2025derived2025-12-31$263.8M-$328.5M-124.5%n/a
Q3 20252025-09-30$142.3M-$370.0M-260.0%-1.75
Q2 20252025-06-30$107.4M-$321.7M-299.5%-1.70
Q1 20252025-03-31$92.8M-$256.6M-276.4%-1.42
Q4 2024derived2024-12-31$104.4M-$235.5M-225.5%n/a
Q3 20242024-09-30$93.4M-$220.5M-236.0%-1.27

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20252025-12-31$606.4M-$1.28B-$935.0M$32.6Mn/an/a
FY 20242024-12-31$363.7M-$913.8M-$683.9M$21.9Mn/an/a
FY 20232023-12-31$305.2M-$749.6M-$536.2M$13.3Mn/an/a
FY 20222022-12-31$245.4M-$481.5M-$400.4M$9.9Mn/an/a
FY 20212021-12-31$188.5M-$434.7M-$363.3M$7.3Mn/an/a

Quarters are the three-month figures the company reports; a fourth quarter marked derived is the fiscal year less the three reported quarters, since companies report it only inside the 10-K. Fiscal years are the annual figures. Buybacks are cash paid to repurchase common stock in the year (XBRL PaymentsForRepurchaseOfCommonStock), not authorizations. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-07-31 from the cover page.

What this page is

INSMED Inc in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page pulls every series the site collects for one ticker onto one URL, keyed by the SEC's own ticker list, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a summary sentence built from the rows (last value, change, range with dates) and its own JSON and CSV links. Nothing on the page is written by a model; the sentences change only when the data does. A page exists only for companies with data in at least two series, and every section says when its source last updated.

This page follows INSMED Inc (INSM), SEC CIK 1104506, listed on Nasdaq, classified by the SEC as pharmaceutical preparations. The cross-market tables live on the short interest and insider transactions hubs.

Source and method

Short interest
FINRA consolidated short interestTwice a month, about eight business days after settlement. Latest 2026-08-14.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesEvery trading day, loaded the following morning. Latest 2026-09-11.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataTwice a month, a few weeks after the half month ends. Latest 2026-08-06.JSON and CSV
Planned sales
SEC EDGAR Form 144EDGAR read every 30 minutes; a notice is filed on or before the sell order. Latest 2026-09-10.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRQuarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC XBRL company factsRefreshed weekly from the SEC's structured data; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
Insider trades
SEC EDGAR Form 4EDGAR read every 30 minutes; filings are due two business days after the trade. Latest 2026-09-09.JSON and CSV
Company record
EDGAR filing index for CIK 1104506Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
30 requests a minute without a key, 120 a minute with a key from a free account.

Data checks. Every dataset is checked against its source once a day. This dataset passed the last run, 13 Sep 05:40 UTC.

How to read it

  • Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
  • Insider buys next to a crowded short are the combination that has historically preceded squeezes; insider sells next to a crowded short are common and mean little.
  • Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other companies the SEC classifies as pharmaceutical preparations

Datasets

Frequently Asked Questions

How much of INSM is sold short?
10,892,278 shares were held short at the 2026-08-14 settlement, 2.7 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is INSM's daily short volume?
On 2026-09-11, 339,038 of the 678,116 INSM shares reported to FINRA were sold short, 50.0% of the day's reported volume. Short volume is a flow for one day, not a position.
Does INSM have fails to deliver?
The SEC's latest file shows 112 INSM shares failed to deliver at settlement 2026-08-06. Fails are reported per settlement date and published twice a month with a lag.
Are INSM insiders buying or selling?
Insiders at INSM reported 5 open-market sells worth $39.2M in the last 90 days and no open-market buys. Sells alone are a weak signal; insiders sell for tax, diversification and estate reasons all the time. Latest filing: Brennan David R on 2026-09-09.
Have INSM insiders filed to sell?
1 Form 144 notice on file for INSM worth $3.1M at the prices reported; 1 in the last 90 days worth $3.1M. Latest: Brennan David R filed on 2026-09-10 to sell 25,000 shares ($3.1M) from 2026-09-09.
What did INSM report last quarter?
In Q2 2026 (quarter ended 2026-06-30) INSMED Inc reported revenue of $425.5M, up 296.1% from the same quarter a year earlier, and net loss of $13.2M (-0.06 diluted EPS). In FY 2025 it generated -$935.0M of operating cash flow. As of 2026-06-30, cash was $544.8M against $546.8M of debt.
Which funds hold INSM?
8 of the 30 tracked managers held INSM at their latest 13F, $1.89B in total at quarter-end prices. D. E. Shaw & Co. is the largest at $633.1M (0.3% of its portfolio) as of 2026-06-30. Over the prior quarter 7 added shares and 1 cut.

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.