Vault-13

MISTRAS GROUP INC MG

COM · Common Stock · CUSIP 60649T107

80 institutional holders +17 vs Q1 2023
14,662,87814.7m shares reported held*
48.4% of all shares outstanding*
$113.2mreported value*
24 new 23 added 17 reduced 9 sold out net bought ≈ $10.3m (+1.4m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($2.0m this quarter). Holder counts are more reliable. Shares outstanding: 30.3m as of 2023-08-03, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $7.72. Options: 4 managers hold calls ($154.0k notional), 2 hold puts ($157.5k).

Trends to Q2 2023

Institutional holders

Managers reporting a position, each quarter

050100Q3 22: 67Q4 22: 62Q1 23: 63Q2 23: 8080Q3 22Q4 22Q1 23Q2 23
Numbers
QuarterHolders
Q3 202267
Q4 202262
Q1 202363
Q2 202380

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
50050Q4 22: 15 bought or addedQ4 22: 39 cut or sold outQ4 22Q1 23: 38 bought or addedQ1 23: 17 cut or sold outQ1 23Q2 23: 47 bought or addedQ2 23: 26 cut or sold outQ2 23
Numbers
QuarterBought or addedCut or sold out
Q4 20221539
Q1 20233817
Q2 20234726

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$50k$100k$150k$200kQ3 22 calls: $63.0kQ3 22 puts: $0Q3 22P/C 0.00Q4 22 calls: $24.2kQ4 22 puts: $493Q4 22P/C 0.02Q1 23 calls: $53.8kQ1 23 puts: $86.1kQ1 23P/C 1.60Q2 23 calls: $154.0kQ2 23 puts: $157.5kQ2 23P/C 1.02
Numbers
QuarterCallsPutsP/C
Q3 2022$63.0k$00.00
Q4 2022$24.2k$4930.02
Q1 2023$53.8k$86.1k1.60
Q2 2023$154.0k$157.5k1.02

Biggest buyers

BlackRock Inc. Added +925,318+925.3k
Acuitas Investments, LLC New +254,000+254.0k
GEODE CAPITAL MANAGEMENT, LLC Added +224,155+224.2k
Hillsdale Investment Management Inc. Added +216,710+216.7k
STATE STREET CORP Added +196,886+196.9k
VANGUARD GROUP INC Added +138,770+138.8k
Empowered Funds, LLC New +131,808+131.8k
NORTHERN TRUST CORP Added +127,966+128.0k
Nuveen Asset Management, LLC New +107,537+107.5k
DIMENSIONAL FUND ADVISORS LP Added +87,789+87.8k

Biggest sellers

Broad Run Investment Management, LLC Sold out -387,470-387.5k
MILLENNIUM MANAGEMENT LLC Reduced -260,325-260.3k
Informed Momentum Co LLC Sold out -254,079-254.1k
GRATIA CAPITAL, LLC Sold out -196,675-196.7k
Invenomic Capital Management LP Reduced -189,069-189.1k
ROYCE & ASSOCIATES LP Reduced -113,686-113.7k
LAWSON KROEKER INVESTMENT MANAGEMENT INC/NE Reduced -107,795-107.8k
D. E. Shaw & Co., Inc. Reduced -66,733-66.7k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -47,978-48.0k
KENNEDY CAPITAL MANAGEMENT LLC Reduced -45,947-45.9k

Biggest calls

CITADEL ADVISORS LLC Added $87.2k11.3k shares
GROUP ONE TRADING LLC Added $34.7k4.5k shares
SIMPLEX TRADING, LLC Added $32.0k4.2k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Biggest puts

CITADEL ADVISORS LLC Added $157.5k20.4k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
Vahaviolos Aspasia Felice 13G · passive investor -0.1 pts · filed 2026-08-13 19.2% -0.1 pts 6.1m≈ $106.7m 2026-08-13
Foglia Stephanie Athena 13D · may seek influence no change · filed 2026-10-07
Stated purposeItem 4 of the Schedule 13D is hereby amended and restated in its entirety as follows: On September 17, 2026, the Issuer entered into an Agreement and Plan of Merger (the "Merger Agreement") with Athena Purchaser, LLC ("Parent") and Athena Merger Sub, Inc., a wholly owned subsidiary of Parent ("Merger Sub"). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, Merger Sub will merge with and into the Issuer, with the Issuer surviving the merger as a wholly owned subsidiary of Parent (the "Merger"). At the effective time of the Merger (the "Effective Time"), each share of common stock, par value $0.01 per share, of the Issuer ("Common Stock") issued and outstanding immediately prior to the Effective Time (other than shares held by Parent, Merger… Full filing
19.1% no change 6.1m≈ $106.3m 2026-10-07
Mill Road Capital III, L.P. 13D · may seek influence +0.2 pts · filed 2026-09-18 6.1% +0.2 pts 1.9m≈ $33.9m 2026-09-18
DIMENSIONAL FUND ADVISORS LP 13G · institution new · filed 2025-07-15 5.2% new 1.6m≈ $28.4m 2025-07-15
Kyriakopoulos Kristy Vahaviolos 13G · passive investor -0.2 pts · filed 2026-03-31 5.1% -0.2 pts 1.6m≈ $28.2m 2026-03-31

Insider purchases and sales in Q2 2023

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
101Q3 21: 0 buyingQ3 21: 0 sellingQ4 21: 0 buyingQ4 21: 0 sellingQ4 21Q1 22: 1 buyingQ1 22: 0 sellingQ2 22: 0 buyingQ2 22: 0 sellingQ2 22Q3 22: 0 buyingQ3 22: 0 sellingQ4 22: 0 buyingQ4 22: 0 sellingQ4 22Q1 23: 0 buyingQ1 23: 0 sellingQ2 23: 0 buyingQ2 23: 0 sellingQ2 23
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q3 20210—0——
Q4 20210—0——
Q1 20221$4.8k0——
Q2 20220—0——
Q3 20220—0——
Q4 20220—0——
Q1 20230—0——
Q2 20230—0——

None reported in Q2 2023.

Holders, Q2 2023

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Price Jennifer C. 3.93% of their portfolio NEW YORK, NY 1,480,4911.5m $11.4m $11.4m 3.93% Unchanged
2 Mill Road Capital Management LLC 6.18% of their portfolio Greenwich, CT 1,480,1221.5m $11.4m $11.4m 6.18% Unchanged
3 BlackRock Inc. 0.00% of their portfolio New York, NY 1,388,4401.4m $10.7m $10.7m 0.00% Added +925.3k +925,318
4 ROYCE & ASSOCIATES LP 0.09% of their portfolio New York, NY 1,261,5171.3m $9.7m $9.7m 0.09% Reduced -113.7k -113,686
5 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 1,200,2761.2m $9.3m $9.3m 0.00% Added +87.8k +87,789
6 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 1,163,0371.2m $9.0m $9.0m 0.00% Added +138.8k +138,770
7 Invenomic Capital Management LP 0.45% of their portfolio BOSTON, MA 1,045,2971.0m $8.1m $8.1m 0.45% Reduced -189.1k -189,069
8 FEDERATED HERMES, INC. 0.01% of their portfolio PITTSBURGH, PA 709,445709.4k $5.5m $5.5m 0.01% Reduced -10.2k -10,229
9 BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.08% of their portfolio HOUSTON, TX 420,858420.9k $3.2m $3.2m 0.08% Added +4.6k +4,588
10 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 385,576385.6k $3.0m $3.0m 0.00% Added +224.2k +224,155
11 Pacific Ridge Capital Partners, LLC 0.58% of their portfolio LAKE OSWEGO, OR 331,946331.9k $2.6m $2.6m 0.58% Added +14.2k +14,240
12 Foundry Partners, LLC 0.15% of their portfolio MINNEAPOLIS, MN 311,391311.4k $2.4m $2.4m 0.15% Added +42.4k +42,381
13 LAWSON KROEKER INVESTMENT MANAGEMENT INC/NE 0.55% of their portfolio OMAHA, NE 294,128294.1k $2.3m $2.3m 0.55% Reduced -107.8k -107,795
14 Hillsdale Investment Management Inc. 0.19% of their portfolio Toronto, A6 266,800266.8k $2.1m $2.1m 0.19% Added +216.7k +216,710
15 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 254,166254.2k $2.0m $2.0m 0.00% Added +196.9k +196,886
16 Acuitas Investments, LLC 1.14% of their portfolio Seattle, WA 254,000254.0k $2.0m $2.0m 1.14% New
17 JB CAPITAL PARTNERS LP 0.34% of their portfolio Armonk, NY 202,243202.2k $1.6m $1.6m 0.34% Unchanged
18 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 165,649165.6k $1.3m $1.3m 0.00% Added +128.0k +127,966
19 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 156,100156.1k $1.2m $1.2m 0.00% Unchanged
20 Empowered Funds, LLC 0.04% of their portfolio NEWTOWN SQUARE, PA 131,808131.8k $1.0m $1.0m 0.04% New
21 EA Series Trust 0.04% of their portfolio HAVERTOWN, PA 131,808131.8k $1.0m $1.0m 0.04% First filing
22 Nuveen Asset Management, LLC 0.00% of their portfolio CHICAGO, IL 107,537107.5k $830.2k $830.2k 0.00% New
23 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 96,30896.3k $743.5k $743.5k 0.00% Reduced -346 -346
24 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 89,82589.8k $693.4k $693.4k 0.00% Reduced -260.3k -260,325
25 TRUIST FINANCIAL CORP 0.00% of their portfolio CHARLOTTE, NC 88,67588.7k $684.6k $684.6k 0.00% Unchanged
26 O'SHAUGHNESSY ASSET MANAGEMENT, LLC 0.01% of their portfolio Stamford, CT 80,13980.1k $618.7k $618.7k 0.01% Added +56.8k +56,791
27 RBF Capital, LLC 0.04% of their portfolio RENO, NV 79,79379.8k $616.0k $616.0k 0.04% New
28 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 77,70077.7k $600.0k $600.0k 0.00% Added +31.5k +31,500
29 KENNEDY CAPITAL MANAGEMENT LLC 0.01% of their portfolio ST LOUIS, MO 76,64376.6k $591.7k $591.7k 0.01% Reduced -45.9k -45,947
30 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 76,25576.3k $588.7k $588.7k 0.00% Reduced -3.2k -3,210
31 Assenagon Asset Management S.A. 0.00% of their portfolio SENNINGERBERG, N4 75,90675.9k $586.0k $586.0k 0.00% Added +36.2k +36,161
32 Verdad Advisers, LP 0.91% of their portfolio BOSTON, MA 75,00075.0k $579.0k $579.0k 0.91% New
33 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 65,79165.8k $507.9k $507.9k 0.00% Added +53.1k +53,091
34 TWO SIGMA ADVISERS, LP 0.00% of their portfolio NEW YORK, NY 60,02460.0k $463.4k $463.4k 0.00% Added +1.5k +1,500
35 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 58,36758.4k $450.6k $450.6k 0.00% Reduced -66.7k -66,733
36 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 54,63154.6k $421.8k $421.8k 0.00% New
37 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 54,48854.5k $420.6k $420.6k 0.00% Reduced -6.0k -5,977
38 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 54,48154.5k $420.6k $420.6k 0.00% Reduced -10.9k -10,862
39 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 50,64950.6k $391.0k $391.0k 0.00% Reduced -5.9k -5,862
40 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 46,41746.4k $358.3k $358.3k 0.00% Reduced -7.8k -7,767
41 Connor, Clark & Lunn Investment Management Ltd. 0.00% of their portfolio VANCOUVER, A1 46,41046.4k $358.3k $358.3k 0.00% Added +18.7k +18,679
42 RHUMBLINE ADVISERS 0.00% of their portfolio BOSTON, MA 39,58739.6k $305.6k $305.6k 0.00% New
43 Values First Advisors, Inc. 0.18% of their portfolio JOHNSON CITY, TN 38,02938.0k $293.6k $293.6k 0.18% Added +828 +828
44 Janney Montgomery Scott LLC 0.00% of their portfolio PHILADELPHIA, PA 36,16536.2k $279.0k $279.0k 0.00% Added +4.2k +4,200
45 RITHOLTZ WEALTH MANAGEMENT 0.01% of their portfolio NEW YORK, NY 31,68131.7k $244.6k $244.6k 0.01% New
46 Trexquant Investment LP 0.01% of their portfolio STAMFORD, CT 28,19728.2k $217.7k $217.7k 0.01% New
47 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 24,27224.3k $187.0k $187.0k 0.00% Added +7.3k +7,272
48 NJ State Employees Deferred Compensation Plan 0.03% of their portfolio TRENTON, NJ 24,00024.0k $185.3k $185.3k 0.03% Unchanged
49 JACOBS LEVY EQUITY MANAGEMENT, INC 0.00% of their portfolio FLORHAM PARK, NJ 21,89821.9k $169.1k $169.1k 0.00% Added +2.7k +2,679
50 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 21,84821.8k $168.7k $168.7k 0.00% Reduced -3.8k -3,769
51 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 21,82121.8k $168.5k $168.5k 0.00% Reduced -48.0k -47,978
52 OLD NATIONAL BANCORP /IN/ 0.00% of their portfolio EVANSVILLE, IN 20,00020.0k $154.4k $154.4k 0.00% Unchanged
53 OCCUDO QUANTITATIVE STRATEGIES LP 0.01% of their portfolio FORT LAUDERDALE, FL 18,43718.4k $142.3k $142.3k 0.01% New
54 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 16,75116.8k $129.3k $129.3k 0.00% Added +15.4k +15,425
55 NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio ALBANY, NY 13,10013.1k $101.1k $101.1k 0.00% New
56 UBS Group AG 0.00% of their portfolio ZURICH, V8 12,37912.4k $95.6k $95.6k 0.00% Added +11.9k +11,891
57 Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio SEOUL, M5 12,26112.3k $94.7k $94.7k 0.00% New
58 Jump Financial, LLC 0.00% of their portfolio Chicago, IL 12,10012.1k $93.4k $93.4k 0.00% New
59 Stokes Family Office, LLC 0.01% of their portfolio NEW ORLEANS, LA 12,01312.0k $92.7k $92.7k 0.01% New
60 MetLife Investment Management, LLC 0.00% of their portfolio Whippany, NJ 11,06911.1k $85.5k $85.5k 0.00% New
61 AMERICAN INTERNATIONAL GROUP, INC. 0.00% of their portfolio New York, NY 10,02510.0k $77.4k $77.4k 0.00% New
62 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 7,9317.9k $61.2k $61.2k 0.00% Added +7.8k +7,792
63 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 7,2237.2k $55.8k $55.8k 0.00% New
64 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio WEST SACRAMENTO, CA 6,9286.9k $53.5k $53.5k 0.00% New
65 Rockefeller Capital Management L.P. 0.00% of their portfolio NEW YORK, NY 6,6956.7k $51.7k $51.7k 0.00% First filing
66 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 6,2026.2k $47.9k $47.9k 0.00% New
67 TD Waterhouse Canada Inc. 0.00% of their portfolio TORONTO, A6 2,8702.9k $22.3k $22.3k 0.00% Unchanged
68 AMALGAMATED BANK 0.00% of their portfolio NEW YORK, NY 2,0262.0k $16.0k $16.0k 0.00% New
69 Legal & General Group Plc 0.00% of their portfolio London, X0 1,8731.9k $14.5k $14.5k 0.00% New
70 PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO 0.00% of their portfolio COLUMBUS, OH 1,8401.8k $14.0k $14.0k 0.00% Unchanged
71 Ameritas Investment Partners, Inc. 0.00% of their portfolio LINCOLN, NE 1,7201.7k $13.3k $13.3k 0.00% New
72 Metropolitan Life Insurance Co/NY 0.00% of their portfolio New York, NY 1,1471.1k $8.9k $8.9k 0.00% New
73 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 937937 $7.2k $7.2k 0.00% Reduced -10.4k -10,427
74 FIRST MANHATTAN CO. LLC. 0.00% of their portfolio NEW YORK, NY 800800 $6.2k $6.2k 0.00% Unchanged
75 Investors Research Corp 0.00% of their portfolio ATLANTA, GA 800800 $6.2k $6.2k 0.00% Unchanged
76 Key Financial Inc 0.00% of their portfolio WEST CHESTER, PA 785785 $6.1k $6.1k 0.00% Unchanged
77 Quarry LP 0.00% of their portfolio NEW YORK, NY 478478 $3.7k $3.7k 0.00% New
78 FMR LLC 0.00% of their portfolio BOSTON, MA 269269 $2.1k $2.1k 0.00% Reduced -153 -153
79 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 200200 $1.5k $1.5k 0.00% Unchanged
80 CONCOURSE FINANCIAL GROUP SECURITIES, INC. 0.00% of their portfolio BIRMINGHAM, AL 00 $0 $0 0.00% Unchanged