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HowShorted

PULM short interest Nasdaq Capital Market

Pulmatrix, Inc. Common Stock. FINRA's reported shares short for this symbol, twice a month by settlement date, shown as the regulator publishes them. No percentage is shown: an SEC filer exists but no defensible share count is available yet.

Shares short
55,391
vs previous settlement
+35,193 (+174.2%)
days to cover
1.27
Settlement date
15 Sep 2026

Shares short over time

Aggregate net short position time series for PULM shares short

Days to cover

FINRA's own figure: reported shares short divided by the security's average daily trading volume, published alongside each settlement.

Aggregate net short position time series for PULM days to cover

Fails to deliver

The SEC's fails-to-deliver figure for PULM: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
276
5 Aug 2026
Highest in window
7,537
26 Jun 2026
Days with a balance
43
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Pulmatrix, Inc. Common Stock fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 7.5K shares.

History

Every FINRA settlement we hold for PULM, newest first. สณ marks a figure FINRA itself flagged as revised.

Full reported short interest history
Settlement dateShares shortChangeDays to cover
15 Sep 202655,391+35,1931.27
31 Aug 202620,198+16,0271.58
14 Aug 20264,171โˆ’12,6211.00
31 Jul 202616,792โˆ’10,6891.29
15 Jul 202627,481โˆ’63,7861.00
30 Jun 202691,267+81,3081.00
15 Jun 20269,959โˆ’14,8731.00
29 May 202624,832โˆ’9,0701.38
15 May 202633,902โˆ’6,5112.14
30 Apr 202640,413+20,8111.00
15 Apr 202619,602+11,5491.00
31 Mar 20268,053+5,5481.00
13 Mar 20262,505โˆ’2741.00
27 Feb 20262,779โˆ’1,5141.00
13 Feb 20264,293+981.00
30 Jan 20264,195โˆ’2,8401.00
15 Jan 20267,035โˆ’4,3331.00
31 Dec 202511,368+7,0691.00
15 Dec 20254,299โˆ’1,4431.00
28 Nov 20255,742+2381.00
14 Nov 20255,504+3461.39
31 Oct 20255,158โˆ’7591.00
15 Oct 20255,917โˆ’6,7651.00
30 Sep 202512,682+9,0721.00
15 Sep 20253,610โˆ’3,6841.00
29 Aug 20257,294โˆ’2,5361.00
15 Aug 20259,830โˆ’7,2671.00
31 Jul 202517,097โˆ’8,2861.92
15 Jul 202525,383+8,6291.99
30 Jun 202516,754โˆ’13,9581.00
13 Jun 202530,712+8,7931.39
30 May 202521,919+3,7661.00
15 May 202518,153โˆ’5,6741.77
30 Apr 202523,827โˆ’1,3462.91
15 Apr 202525,173โˆ’11,7481.18
31 Mar 202536,921โˆ’9451.90
14 Mar 202537,866+3,2471.49
28 Feb 202534,619โˆ’4,0251.00
14 Feb 202538,644โˆ’14,2212.73
31 Jan 202552,865+5,2091.84
15 Jan 202547,656+8,1721.00
31 Dec 202439,484โˆ’35,4241.00
13 Dec 202474,908+16,3131.00
29 Nov 202458,595โˆ’353,0191.00
15 Nov 2024411,614+404,5661.00
31 Oct 20247,048+5301.00
15 Oct 20246,518+1,4521.00
30 Sep 20245,066โˆ’1,3321.00
13 Sep 20246,398+1,2851.00
30 Aug 20245,113โˆ’2,9691.00
15 Aug 20248,082โˆ’3,6741.00
31 Jul 202411,756+6,5901.58
15 Jul 20245,166+4,0601.00
28 Jun 20241,106+6071.00
14 Jun 2024499โˆ’1,6841.00
31 May 20242,183+1,7951.00
15 May 2024388โˆ’2,5161.00
30 Apr 20242,904โˆ’8,5611.00
15 Apr 202411,465+8,8031.00
28 Mar 20242,662+2,2981.00
15 Mar 2024364โˆ’14,9551.00
29 Feb 202415,319+7,3071.00
15 Feb 20248,012+1,6821.00
31 Jan 20246,330+4,9051.00
12 Jan 20241,425โˆ’2,9281.00
29 Dec 20234,353โˆ’3,5821.00
15 Dec 20237,935+1,7011.00
30 Nov 20236,234+4,0911.00
15 Nov 20232,143โˆ’1,2741.00
31 Oct 20233,417โˆ’4521.00
13 Oct 20233,869โˆ’1,0401.00
29 Sep 20234,909+6561.00
15 Sep 20234,253+1,5531.00
31 Aug 20232,700โˆ’6881.00
15 Aug 20233,388+1,6171.00
31 Jul 20231,771โˆ’1,4861.00
14 Jul 20233,257โˆ’2,3061.00
30 Jun 20235,563โˆ’5,0071.00
15 Jun 202310,570+5,7681.00
31 May 20234,802+1,0711.00
15 May 20233,731+2,4181.00
28 Apr 20231,313โˆ’1,5821.00
14 Apr 20232,895โˆ’191.00
31 Mar 20232,914โˆ’5,1751.00
15 Mar 20238,089โˆ’1,3451.00
28 Feb 20239,434โˆ’5,3621.00
15 Feb 202314,796โˆ’19,4181.00
31 Jan 202334,214โˆ’11,1391.35
13 Jan 202345,353+6,5151.00
30 Dec 202238,838โˆ’2,9361.23
15 Dec 202241,774+1,1381.82
30 Nov 202240,636โˆ’10,8863.16
15 Nov 202251,522โˆ’9292.44
31 Oct 202252,451โˆ’13,0672.99
14 Oct 202265,518โˆ’20,9252.24
30 Sep 202286,443โˆ’17,9982.66
15 Sep 2022104,441โˆ’41,2152.85
31 Aug 2022145,656+130,1221.00
15 Aug 202215,534โˆ’1961.00
29 Jul 202215,730+4,2081.00
15 Jul 202211,522+7591.04
30 Jun 202210,763โˆ’8,5641.00
15 Jun 202219,327+1,8301.15
31 May 202217,497โˆ’5,2821.50
13 May 202222,779โˆ’4,9201.23
29 Apr 202227,699โˆ’80,3011.32
14 Apr 2022108,000โˆ’27,0265.77
31 Mar 2022135,026+38,9122.70
15 Mar 202296,114โˆ’322,2931.00
28 Feb 2022418,407+152,5251.00
15 Feb 2022265,882โˆ’69,4881.00
31 Jan 2022335,370โˆ’101,0741.00
14 Jan 2022436,444โˆ’1,808,8541.00
31 Dec 20212,245,298+1,387,1951.00
15 Dec 2021858,103โˆ’167,8631.00
30 Nov 20211,025,966โˆ’265,7851.45
15 Nov 20211,291,751+22,5421.52
29 Oct 20211,269,209+107,2701.23
15 Oct 20211,161,939โˆ’58,2935.29
30 Sep 20211,220,232+68,8714.68
15 Sep 20211,151,361+101,3305.03
31 Aug 20211,050,031+127,1463.93
13 Aug 2021922,885+110,9492.44
30 Jul 2021811,936+179,4212.16
15 Jul 2021632,515โˆ’105,1181.61
30 Jun 2021737,633โˆ’15,7171.67
15 Jun 2021753,350สณโˆ’77,2911.00
28 May 2021830,641โˆ’181,6501.73
14 May 20211,012,291โˆ’86,9941.47
30 Apr 20211,099,285+310,3551.46
15 Apr 2021788,930โˆ’481,5951.00
31 Mar 20211,270,525โˆ’122,9521.19
15 Mar 20211,393,477+52,0351.00
26 Feb 20211,341,442+298,7131.00
12 Feb 20211,042,729+949,4331.00
29 Jan 202193,296+55,6971.00
15 Jan 202137,599โˆ’193,3221.00
31 Dec 2020230,921+142,9081.00
15 Dec 202088,013โˆ’173,3531.00
30 Nov 2020261,366+170,5811.00
13 Nov 202090,785โˆ’257,3541.00
30 Oct 2020348,139+125,9961.00
15 Oct 2020222,143+103,8221.12
30 Sep 2020118,321+20,4661.00
15 Sep 202097,855โˆ’6,4711.00
31 Aug 2020104,326โˆ’120,7351.00
14 Aug 2020225,061โˆ’333,6901.00
31 Jul 2020558,751+213,1311.00
15 Jul 2020345,620โˆ’1,333,0401.00
30 Jun 20201,678,660+309,3432.16
15 Jun 20201,369,317โˆ’135,0802.47
29 May 20201,504,397โˆ’384,1431.83
15 May 20201,888,540+573,0952.05
30 Apr 20201,315,445โˆ’311,9831.00
15 Apr 20201,627,428+553,8961.45
31 Mar 20201,073,532โˆ’86,2881.66
13 Mar 20201,159,820+315,8942.55
28 Feb 2020843,926+10,2291.47
14 Feb 2020833,697โˆ’24,1792.49
31 Jan 2020857,876โˆ’67,2021.19
15 Jan 2020925,078+706,5151.00
31 Dec 2019218,563โˆ’11,0941.96
13 Dec 2019229,657โˆ’51,6561.56
29 Nov 2019281,313+13,4071.88
15 Nov 2019267,906+14,7742.58
31 Oct 2019253,132โˆ’113,2591.79
15 Oct 2019366,391โˆ’82,8624.45
30 Sep 2019449,253โˆ’79,5964.87
13 Sep 2019528,849โˆ’60,4335.76
30 Aug 2019589,282โˆ’55,3671.38
15 Aug 2019644,649โˆ’65,6455.86
31 Jul 2019710,294+112,7784.86
15 Jul 2019597,516โˆ’61,3812.54
28 Jun 2019658,897โˆ’40,1654.24
14 Jun 2019699,062+39,5352.03
31 May 2019659,527+97,1461.13
15 May 2019562,381+66,5581.00
30 Apr 2019495,823โˆ’226,5691.00
15 Apr 2019722,392+52,7051.00
29 Mar 2019669,687+44,9661.72
15 Mar 2019624,721+125,0901.00
28 Feb 2019499,631+116,6051.22
15 Feb 2019383,026สณโˆ’2,190,3351.00
31 Jan 20192,573,361โˆ’569,6661.49
15 Jan 20193,143,027โˆ’613,6697.11
31 Dec 20183,756,696โˆ’101,76610.50
14 Dec 20183,858,462โˆ’408,77715.71
30 Nov 20184,267,239โˆ’220,12813.68
15 Nov 20184,487,367โˆ’758,39812.89
31 Oct 20185,245,765+48,23821.64
15 Oct 20185,197,527+131,25314.65
28 Sep 20185,066,274+142,76917.37
14 Sep 20184,923,505+94,40913.66
31 Aug 20184,829,096+10,54010.28
15 Aug 20184,818,556โˆ’113,6505.25
31 Jul 20184,932,206โˆ’75,23810.11
13 Jul 20185,007,444+532,2187.53
29 Jun 20184,475,226+922,6872.47
15 Jun 20183,552,539+1,275,7311.00
31 May 20182,276,808โˆ’110,6372.76
15 May 20182,387,445โˆ’140,8844.01
30 Apr 20182,528,329+765,6482.00
13 Apr 20181,762,681โˆ’545,5441.25
29 Mar 20182,308,225+517,4442.45
15 Mar 20181,790,781+22,3938.66
28 Feb 20181,768,388โˆ’33,81310.90
15 Feb 20181,802,201+122,1354.85
31 Jan 20181,680,066+109,4402.01
12 Jan 20181,570,626+28,4375.12
29 Dec 20171,542,189โ€“8.06

Scroll inside the table for earlier settlements, back to 29 Dec 2017.

Questions

Frequently asked questions

What is PULM's short interest?
55,391 shares short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report, up 35,193 from the previous settlement.
Why is there no percentage for PULM?
Because no defensible share count exists to divide by: an SEC filer exists but no defensible share count is available yet. The symbol maps to an SEC filer, but its share count cannot be used yet. A newly listed company needs two cover-page counts on file before the first is trusted; a split or an unexplained jump pauses publication until a fresh SEC count corroborates it; a secondary share class publishes under the company's primary line; and a foreign filer's short count is in depositary-share units. This page upgrades to a percentage automatically once a defensible count exists.
What is PULM's days to cover?
1.27 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume, published in the same file and shown verbatim. We hold no volume data ourselves.
Is this the short float?
No. This page shows FINRA's share count only. Short float divides that count by the public float, and short interest as we publish it elsewhere divides it by shares outstanding from SEC filings. Neither denominator is available for this line, so neither ratio is shown.
How often does this update?
FINRA member firms report short positions as of the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. We ingest each file the day it appears and re-read recent settlements for revisions.

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