XOOMAR

Mesa Laboratories (MLAB)

Mesa Laboratories on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, financials, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as industrial instruments for measurement, display, and control.

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447K

Short interest

settlement 2026-09-30

3.7

Days to cover

+0.7 days vs prior

65.5%

Short share of volume

2026-10-12

5,200

Fails to deliver

settlement 2026-09-03

Thu 5 Nov

Next earnings

estimated date

$102K

Insider flow, 90 days

2 buys, 1 sells

As of 2026-10-12.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 30 September 2026, short interest in MLAB is 447,048 shares, up 13,066 shares over the last month. Over the last 48 readings it ranged from 122,974 shares (15 November 2024) to 447,048 shares (30 September 2026). The latest reading sits at the top of that range. At the reported average volume of 121K shares a day that is 3.7 days to cover.

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SettlementShares shortChangeAvg daily volumeDays to cover
2026-09-30447,048+10.8%120,9383.70
2026-09-15403,559-7.0%133,8173.02
2026-08-31433,982+28.5%159,8242.72
2026-08-14337,738+4.2%170,0331.99
2026-07-31324,102+18.2%129,6762.50
2026-07-15274,176-0.7%227,0971.21
2026-06-30276,170+15.5%208,7671.32
2026-06-15239,181-14.5%267,7791.00
2026-05-29279,822+20.5%210,6031.33
2026-05-15232,139+16.9%137,9681.68
2026-04-30198,615+0.1%107,8801.84
2026-04-15198,395-10.1%105,2051.89
2026-03-31220,739-1.7%108,7762.03
2026-03-13224,457+0.3%173,5721.29
2026-02-27223,687+5.7%78,5202.85
2026-02-13211,720-5.1%84,0042.52
2026-01-30223,102-9.6%80,2612.78
2026-01-15246,660-12.1%110,1242.24
2025-12-31280,731-0.9%88,7783.16
2025-12-15283,413+1.1%122,7262.31
2025-11-28280,290-14.2%242,3421.16
2025-11-14326,568-10.4%121,0602.70
2025-10-31364,590+6.1%80,1824.55
2025-10-15343,694+3.3%104,2123.30

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 12 October 2026, the short share of MLAB volume is 65.5%, up 27.3 points over the last five sessions. Over the last 30 readings it ranged from 28.1% (30 September 2026) to 83.0% (1 September 2026). The latest reading is 5.5 points above the 30-session average of 60.0%, on 25K shares reported.

DateShort volumeTotal volumeShort shareExempt
2026-10-1217K25K65.5%0
2026-10-0914K24K58.2%0
2026-10-0824K42K56.6%0
2026-10-0710K17K58.6%0
2026-10-0616K30K55.0%0
2026-10-0525K64K38.2%0
2026-10-0216K26K60.9%0
2026-10-0112K29K42.4%0
2026-09-3016K57K28.1%0
2026-09-2926K46K56.7%0
2026-09-2810K17K56.2%0
2026-09-2527K71K38.3%0
2026-09-2433K74K44.4%0
2026-09-2324K36K65.0%0
2026-09-2224K36K65.5%0
2026-09-2126K34K76.5%0
2026-09-1818K26K68.6%21
2026-09-1718K25K74.6%66
2026-09-1625K44K56.4%54
2026-09-1526K43K59.7%0
2026-09-1424K40K60.5%0
2026-09-1128K55K51.3%0
2026-09-1028K53K52.4%15
2026-09-0933K47K69.7%0
2026-09-0830K53K55.8%0
2026-09-0418K24K73.7%0
2026-09-0338K53K71.9%0
2026-09-0244K60K73.7%2,175
2026-09-0131K37K83.0%0
2026-08-3147K57K82.3%0

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 3 September 2026, the fails-to-deliver balance in MLAB is 5,200 shares, up 1 share over the last settlement date. Over the last 30 readings it ranged from 1 share (27 April 2026) to 5,200 shares (3 September 2026). The latest reading sits at the top of that range.

SettlementShares failedPriceValue
2026-09-035,200$130.65$679K
2026-09-025,199$125.47$652K
2026-08-281,366$128.65$176K
2026-08-271,614$127.15$205K
2026-08-21218$119.15$26K
2026-08-20103$119.72$12K
2026-08-0412$104.43$1K
2026-08-03140$100.81$14K
2026-07-31216$101.04$22K
2026-07-29898$101.10$91K
2026-07-0891$96.16$9K
2026-07-0222$104.39$2K
2026-06-17116$99.68$12K
2026-06-0370$106.66$7K
2026-05-28239$90.80$22K
2026-04-301$95.76$96
2026-04-271$97.96$98
2026-04-2451$96.90$5K
2026-03-18208$81.69$17K
2026-03-1024$87.69$2K
2026-02-27636$95.56$61K
2026-02-0246$78.76$4K
2025-12-305$79.98$400
2025-12-187$79.77$558
2025-12-17536$78.63$42K
2025-12-107$77.87$545
2025-12-052$77.15$154
2025-11-25200$77.74$16K
2025-11-2180$71.60$6K
2025-11-2094$70.72$7K

Insider trades

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

Over the last 90 days MLAB insiders reported 2 open-market buys ($902K) against 1 sell ($800K), so the dollar flow leans toward buying. Latest filing: Tripeny R Tony (Director) on 2026-08-15.

DateInsiderTitleTypeSharesPriceValueOwned after
2026-08-15Tripeny R TonyDirectorOption exercise3K$0.00$09K
2026-08-15Sullivan John JamesDirectorOption exercise3K$0.00$021K
2026-08-15Ladiwala Shiraz ShabanaliDirectorOption exercise4K$0.00$012K
2026-08-15Hall ShannonDirectorOption exercise3K$0.00$07K
2026-08-15Capone Mark ChristopherDirectorOption exercise3K$0.00$06K
2026-08-15Alltoft Jennifer SadieDirectorOption exercise3K$0.00$08K
2026-08-13Sullivan John JamesDirectorSell7K$112.80$800K18K
2026-08-13Tripeny R TonyDirectorBuy900$113.69$102K6K
2026-08-13Kadia SiddharthaPresident and CEOBuy7K$112.80$800K7K
2026-06-22Sakys JohnCFOSell3K$89.50$253K20K
2026-06-22Crennen Lyndsey ElizabethCAOSell442$89.50$40K2K
2026-06-22Archbold Brian DavidSVP OperationsSell3K$89.50$225K6K
2026-06-18Sakys JohnCFOGrant2K$95.10$217K23K
2026-06-18Sakys JohnCFOOption exercise1K$95.10$99K18K
2026-06-18Sakys JohnCFOOption exercise3K$95.10$262K20K
2026-06-18Crennen Lyndsey ElizabethCAOOption exercise368$95.10$35K2K
2026-06-18Crennen Lyndsey ElizabethCAOGrant263$95.10$25K2K
2026-06-18Crennen Lyndsey ElizabethCAOOption exercise125$95.10$12K2K
2026-06-18Crennen Lyndsey ElizabethCAOOption exercise233$95.10$22K2K
2026-06-18Archbold Brian DavidSVP OperationsGrant2K$95.10$177K9K
2026-06-18Archbold Brian DavidSVP OperationsOption exercise2K$95.10$236K7K
2026-06-18Archbold Brian DavidSVP OperationsOption exercise844$95.10$80K5K
2026-06-16Sakys JohnCFOSell1K$101.27$124K17K
2026-06-16Crennen Lyndsey ElizabethCAOSell118$101.27$12K1K
2026-06-16Archbold Brian DavidSVP OperationsSell1K$101.27$117K4K
2026-06-15Sakys JohnCFOOption exercise3K$104.08$283K18K
2026-06-15Archbold Brian DavidSVP OperationsOption exercise2K$104.08$255K5K
2026-03-10Tripeny R TonyDirectorBuy1K$76.00$100K5K
2026-03-10Ladiwala Shiraz ShabanaliDirectorBuy4K$72.23$253K9K
2026-03-10Capone Mark ChristopherDirectorBuy1K$76.35$99K3K
2025-12-02Sullivan John JamesDirectorGift2K$0.00$025K
2025-10-27Owens Gary MPresident and CEOOption exercise12K$0.00$064K
2025-08-15Sullivan John JamesDirectorOption exercise1K$0.00$027K
2025-08-15Tripeny R TonyDirectorOption exercise1K$0.00$04K
2025-08-15Ladiwala Shiraz ShabanaliDirectorOption exercise2K$0.00$05K
2025-08-15Hall ShannonDirectorOption exercise1K$0.00$04K
2025-08-15Capone Mark ChristopherDirectorOption exercise1K$0.00$02K
2025-08-15Alltoft Jennifer SadieDirectorOption exercise1K$0.00$05K
2025-06-21Owens Gary MPresident and CEOTax withholding1K$95.82$138K53K
2025-06-21Owens Gary MPresident and CEOOption exercise3K$95.82$316K54K
2025-06-21Sakys JohnCFOTax withholding454$95.82$44K15K
2025-06-21Sakys JohnCFOOption exercise1K$95.82$99K15K
2025-06-21Archbold Brian DavidSVP OperationsTax withholding385$95.82$37K2K
2025-06-21Archbold Brian DavidSVP OperationsOption exercise844$95.82$81K3K
2025-06-18Owens Gary MPresident and CEOTax withholding4K$92.99$354K51K
2025-06-18Owens Gary MPresident and CEOOption exercise9K$92.99$810K55K
2025-06-18Sakys JohnCFOTax withholding1K$92.99$116K14K
2025-06-18Sakys JohnCFOOption exercise3K$92.99$264K16K
2025-06-18Archbold Brian DavidSVP OperationsTax withholding1K$92.99$108K2K
2025-06-18Archbold Brian DavidSVP OperationsOption exercise3K$92.99$238K3K

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 rarer.

Planned sales (Form 144)

Newest first. JSON

7 Form 144 notices on file for MLAB worth $6.1M at the prices reported; 2 in the last 90 days worth $5.1M. Latest: Owens Gary M filed on 2026-08-27 to sell 20,358 shares ($2.6M) from 2026-08-27.

FiledSellerSharesMarket valueOf outstandingSale fromBroker
2026-08-27Owens Gary MFormer Officer20K$2.6M0.364%2026-08-27Fidelity Brokerage Services LLC
2026-08-21Owens Gary MFormer Officer20K$2.5M0.357%2026-08-21Fidelity Brokerage Services LLC
2026-06-22Sakys JohnOfficer3K$253K0.051%2026-06-22Fidelity Brokerage Services LLC
2026-06-22Archbold Brian DavidOfficer3K$225K0.046%2026-06-22Fidelity Brokerage Services LLC
2026-06-16Sakys JohnOfficer1K$124K0.022%2026-06-16Fidelity Brokerage Services LLC
2026-06-16Owens Gary MFormer Officer4K$375K0.067%2026-06-16Fidelity Brokerage Services LLC
2026-06-16Archbold Brian DavidOfficer1K$117K0.021%2026-06-16Fidelity Brokerage Services LLC

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

8 holders report 5% or more of MLAB in their latest filing, all on Schedule 13G (passive). The largest reported stake is Brian Paul Nelson at 8.6% of the class (477,126 shares), filed 2026-07-07 for an event on 2026-06-30.

FiledFormHolderSharesOf classEvent
2026-10-0913GWasatch Advisors LPinvestment adviser387K6.9%2026-09-30
2026-07-0713G/Ano. 2Brian Paul Nelsonindividual, parent holding company477K8.6%2026-06-30
2026-07-0713G/Ano. 2William Thomas Brennanindividual, parent holding company477K8.6%2026-06-30
2026-07-0713G/Ano. 2Long Path Holdings LLCother entity477K8.6%2026-06-30
2026-07-0713G/Ano. 2Long Path Partners, LPinvestment adviser, partnership477K8.6%2026-06-30
2026-07-0713G/Ano. 2Long Path Fund GP, LLCother entity477K8.6%2026-06-30
2026-07-0713G/Ano. 2Long Path Smaller Companies Fund, LPpartnership477K8.6%2026-06-30
2026-03-2713G/Ano. 6The Vanguard Groupinvestment adviser00.0%2026-03-13
2025-10-0213G/Ano. 10BlackRock, Inc.parent holding company379K6.9%2025-09-30

13F holders

Tracked managers holding MLAB at their latest 13F. JSON

6 of the 30 tracked managers held MLAB at their latest 13F, $40.0M in total at quarter-end prices. AQR Capital Management is the largest at $20.3M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 5 added shares and 1 cut.

FundQuarterSharesValueOf portfolioChange in shares
AQR Capital Management2026-06-30204K$20.3M0.01%+33K
D. E. Shaw & Co.2026-06-3082K$8.1M0.00%+27K
Citadel Advisors2026-06-3036K$3.6M0.00%+27K
Two Sigma Investments2026-06-3029K$2.9M0.00%+13K
Renaissance Technologies2026-06-3029K$2.9M0.00%-3K
Point72 Asset Management2026-06-3023K$2.2M0.00%+6K

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 Q1 FY 2027 (quarter ended 2026-06-30) Mesa Laboratories reported revenue of $60.1M, up 1.0% from the same quarter a year earlier, and net income of $2.8M (0.49 diluted EPS). In FY 2026 it generated $42.8M of operating cash flow and spent $3.5M on dividends. As of 2026-06-30, cash was $30.7M against $66.1M of debt.

Cash
$30.7M
Debt
$66.1M
Equity
$188.8M
Total assets
$419.2M
Shares outstanding
5,595,869

Quarterly, last 8 quarters

QuarterPeriod endRevenueNet incomeMarginDiluted EPS
Q1 FY 20272026-06-30$60.1M$2.8M4.7%0.49
Q4 FY 2026derived2026-03-31$63.7M-$4.1M-6.5%n/a
Q3 FY 20262025-12-31$65.1M$3.6M5.6%0.65
Q2 FY 20262025-09-30$60.7M$2.5M4.1%0.45
Q1 FY 20262025-06-30$59.5M$4.7M8.0%0.85
Q4 FY 2025derived2025-03-31$62.1M-$7.1M-11.4%n/a
Q3 FY 20252024-12-31$62.8M-$1.7M-2.7%-0.31
Q2 FY 20252024-09-30$57.8M$3.4M5.9%0.63

Fiscal years, with buybacks and dividends

Fiscal yearEndsRevenueNet incomeOperating cash flowCapexBuybacksDividends
FY 20262026-03-31$249.1M$6.7M$42.8M$3.3Mn/a$3.5M
FY 20252025-03-31$241.0M-$2.0M$46.8M$4.2Mn/a$3.5M
FY 20242024-03-31$216.2M-$254.2M$44.1M$2.6Mn/a$3.4M
FY 20232023-03-31$219.1M$930K$28.0M$4.5Mn/a$3.4M
FY 20222022-03-31$184.3M$1.9M$39.2M$4.4Mn/a$3.3M

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 the cash the company paid to repurchase its common stock in the year, not the amount authorized. Balance sheet lines are as of 2026-06-30; shares outstanding as of 2026-08-03 from the cover page.

What this page is

Mesa Laboratories 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 puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, 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 one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Mesa Laboratories (MLAB), SEC CIK 724004, listed on Nasdaq, classified by the SEC as industrial instruments for measurement, display, and control. The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest
FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
Daily short volume
FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-12.JSON and CSV
Fails to deliver
SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-03.JSON and CSV
Planned sales
SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-08-27.JSON and CSV
Large holders
SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-10-09.JSON and CSV
13F holders
SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Financials
SEC EDGAR 10-K and 10-Q filingsSource: SEC.Weekly; values are as filed in the 10-Q and 10-K. Latest 2026-06-30.JSON and CSV
Earnings dates
SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-08-10.JSON and CSV
Insider trades
SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-08-15.JSON and CSV
Company record
EDGAR filing index for CIK 724004Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits
10 requests a minute without a key, 30 with a free key from a free account.

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 large short position are rare and stand out; insider sells next to one 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.

Datasets

Frequently Asked Questions

How much of MLAB is sold short?
447,048 shares were held short at the 2026-09-30 settlement, 3.7 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 MLAB's daily short volume?
On 2026-10-12, 16,615 of the 25,351 MLAB shares reported to FINRA were sold short, 65.5% of the day's reported volume. Short volume is a flow for one day, not a position.
Does MLAB have fails to deliver?
The SEC's latest file shows 5,200 MLAB shares failed to deliver at settlement 2026-09-03. Fails are reported per settlement date and published twice a month with a lag.
Are MLAB insiders buying or selling?
Over the last 90 days MLAB insiders reported 2 open-market buys ($902K) against 1 sell ($800K), so the dollar flow leans toward buying. Latest filing: Tripeny R Tony (Director) on 2026-08-15.
Have MLAB insiders filed to sell?
7 Form 144 notices on file for MLAB worth $6.1M at the prices reported; 2 in the last 90 days worth $5.1M. Latest: Owens Gary M filed on 2026-08-27 to sell 20,358 shares ($2.6M) from 2026-08-27.
Who owns 5% or more of MLAB?
8 holders report 5% or more of MLAB in their latest filing, all on Schedule 13G (passive). The largest reported stake is Brian Paul Nelson at 8.6% of the class (477,126 shares), filed 2026-07-07 for an event on 2026-06-30.
What did MLAB report last quarter?
In Q1 FY 2027 (quarter ended 2026-06-30) Mesa Laboratories reported revenue of $60.1M, up 1.0% from the same quarter a year earlier, and net income of $2.8M (0.49 diluted EPS). In FY 2026 it generated $42.8M of operating cash flow and spent $3.5M on dividends. As of 2026-06-30, cash was $30.7M against $66.1M of debt.
Which tracked 13F managers own MLAB?
6 of the 30 tracked 13F managers held MLAB shares at their latest filing, $40.0M in all. The largest: Cliff Asness's AQR Capital Management (204K shares, $20.3M), D. E. Shaw & Co. (82K shares, $8.1M), Ken Griffin's Citadel Advisors (36K shares, $3.6M), Two Sigma Investments (29K shares, $2.9M), Renaissance Technologies (29K shares, $2.9M), Steve Cohen's Point72 Asset Management (23K shares, $2.2M).

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