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Affiliated Managers Group, Inc.

AMG
Exchange
NYSE
Industry
Investment Advice
SEC CIK
0001004434

No open-market purchases or sales by Affiliated Managers Group, Inc. insiders were filed in the last 90 days; 571 institutions reported holding it in 13F filings for Q2 2026, worth $8.53B in total; Southeastern Asset Management (Longleaf) is the only superinvestor holding it.

Other share classesMGRMGRBMGRDMGRE

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
795.0K
Shares, settlement Oct 30, 2026
Change
−150.3K
−15.9% vs. Oct 15, 2026
Days to cover
3.19
Short interest ÷ average daily volume
Average daily volume
249.0K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 454,820 sharesNov 15, 2024: 501,499 sharesNov 29, 2024: 432,433 sharesDec 13, 2024: 433,483 sharesDec 31, 2024: 502,521 sharesJan 15, 2025: 639,554 sharesJan 31, 2025: 628,717 sharesFeb 14, 2025: 818,357 sharesFeb 28, 2025: 902,359 sharesMar 14, 2025: 895,055 sharesMar 31, 2025: 765,304 sharesApr 15, 2025: 912,710 sharesApr 30, 2025: 737,044 sharesMay 15, 2025: 865,183 sharesMay 30, 2025: 761,839 sharesJun 13, 2025: 789,954 sharesJun 30, 2025: 624,330 sharesJul 15, 2025: 594,244 sharesJul 31, 2025: 570,501 sharesAug 15, 2025: 610,751 sharesAug 29, 2025: 685,524 sharesSep 15, 2025: 675,971 sharesSep 30, 2025: 578,233 sharesOct 15, 2025: 592,542 sharesOct 31, 2025: 586,825 sharesNov 14, 2025: 729,136 sharesNov 28, 2025: 858,970 sharesDec 15, 2025: 587,572 sharesDec 31, 2025: 694,140 sharesJan 15, 2026: 722,765 sharesJan 30, 2026: 444,676 sharesFeb 13, 2026: 498,417 sharesFeb 27, 2026: 492,186 sharesMar 13, 2026: 476,318 sharesMar 31, 2026: 758,066 sharesApr 15, 2026: 977,259 sharesApr 30, 2026: 713,622 sharesMay 15, 2026: 821,107 sharesMay 29, 2026: 1,027,745 sharesJun 15, 2026: 1,257,225 sharesJun 30, 2026: 1,038,960 sharesJul 15, 2026: 883,948 sharesJul 31, 2026: 781,318 sharesAug 14, 2026: 675,879 sharesAug 31, 2026: 868,607 sharesSep 15, 2026: 1,039,423 sharesSep 30, 2026: 1,009,113 sharesOct 15, 2026: 945,382 sharesOct 30, 2026: 795,040 shares
Short interest in AMG by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 2026795.0K−150.3K−15.9%249.0K3.19
Oct 15, 2026945.4K−63.7K−6.3%286.5K3.30
Sep 30, 20261.01M−30.3K−2.9%334.7K3.02
Sep 15, 20261.04M+170.8K+19.7%271.7K3.83
Aug 31, 2026868.6K+192.7K+28.5%263.9K3.29
Aug 14, 2026675.9K−105.4K−13.5%242.4K2.79
Jul 31, 2026781.3K−102.6K−11.6%289.0K2.70
Jul 15, 2026883.9K−155.0K−14.9%233.7K3.78
Jun 30, 20261.04M−218.3K−17.4%359.6K2.89
Jun 15, 20261.26M+229.5K+22.3%388.5K3.24
May 29, 20261.03M+206.6K+25.2%321.9K3.19
May 15, 2026821.1K+107.5K+15.1%306.9K2.68
Apr 30, 2026713.6K−263.6K−27.0%358.5K1.99
Apr 15, 2026977.3K+219.2K+28.9%346.4K2.82
Mar 31, 2026758.1K+281.7K+59.2%373.2K2.03
Mar 13, 2026476.3K−15.9K−3.2%371.7K1.28
Feb 27, 2026492.2K−6.23K−1.3%473.5K1.04
Feb 13, 2026498.4K+53.7K+12.1%518.0K1.00
Jan 30, 2026444.7K−278.1K−38.5%392.1K1.13
Jan 15, 2026722.8K+28.6K+4.1%377.5K1.91
Dec 31, 2025694.1K+106.6K+18.1%478.7K1.45
Dec 15, 2025587.6K−271.4K−31.6%394.5K1.49
Nov 28, 2025859.0K+129.8K+17.8%270.4K3.18
Nov 14, 2025729.1K+142.3K+24.3%375.0K1.94
Oct 31, 2025586.8K−5.72K−1.0%220.1K2.67
Oct 15, 2025592.5K+14.3K+2.5%200.8K2.95
Sep 30, 2025578.2K−97.7K−14.5%233.0K2.48
Sep 15, 2025676.0K−9.55K−1.4%195.4K3.46
Aug 29, 2025685.5K+74.8K+12.2%175.3K3.91
Aug 15, 2025610.8K+40.3K+7.1%159.0K3.84
Jul 31, 2025570.5K−23.7K−4.0%200.0K2.85
Jul 15, 2025594.2K−30.1K−4.8%252.7K2.35
Jun 30, 2025624.3K−165.6K−21.0%234.8K2.66
Jun 13, 2025790.0K+28.1K+3.7%170.1K4.64
May 30, 2025761.8K−103.3K−11.9%267.2K2.85
May 15, 2025865.2K+128.1K+17.4%289.4K2.99
Apr 30, 2025737.0K−175.7K−19.3%181.4K4.06
Apr 15, 2025912.7K+147.4K+19.3%266.0K3.43
Mar 31, 2025765.3K−129.8K−14.5%245.1K3.12
Mar 14, 2025895.1K−7.30K−0.8%325.1K2.75
Feb 28, 2025902.4K+84.0K+10.3%223.4K4.04
Feb 14, 2025818.4K+189.6K+30.2%220.5K3.71
Jan 31, 2025628.7K−10.8K−1.7%158.1K3.98
Jan 15, 2025639.6K+137.0K+27.3%222.6K2.87
Dec 31, 2024502.5K+69.0K+15.9%245.5K2.05
Dec 13, 2024433.5K+1.05K+0.2%181.8K2.39
Nov 29, 2024432.4K−69.1K−13.8%157.9K2.74
Nov 15, 2024501.5K+46.7K+10.3%250.4K2.00
Oct 31, 2024454.8K−92.5K−16.9%161.1K2.82

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in AMG by settlement date
Settlement dateSharesPriceValue
Oct 9, 20263$386.99$1.16K
Oct 6, 2026430$380.70$163.7K
Oct 5, 2026430$371.43$159.7K
Oct 2, 2026440$371.95$163.7K
Sep 14, 202656$355.61$19.9K
Jul 14, 2026812$359.78$292.1K
Jul 8, 20269$359.72$3.24K
Jul 7, 20263$356.61$1.07K
Jul 6, 20263$344.60$1.03K
Jun 26, 20263,019$340.08$1.03M
Jun 25, 20263,066$339.10$1.04M
Jun 11, 202632$335.34$10.7K
Jun 10, 20262$342.12$684.24
May 29, 20265$302.96$1.51K
May 28, 20265$307.92$1.54K
May 27, 20265$308.65$1.54K
May 22, 20264$302.63$1.21K
Mar 26, 2026107$280.66$30.0K
Mar 23, 202616$278.17$4.45K
Mar 20, 202637$278.67$10.3K
Feb 18, 202668$323.01$22.0K
Feb 4, 2026263$308.40$81.1K
Jan 21, 202669,721$318.78$22.2M
Dec 23, 20257$287.67$2.01K
Dec 22, 20251,342$279.09$374.5K
Dec 8, 20257$273.19$1.91K
Nov 25, 20251,045$263.23$275.1K
Nov 17, 20251,189$258.31$307.1K
Nov 14, 20252,206$259.10$571.6K
Oct 15, 2025258$239.13$61.7K

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in AMG by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 12, 202667,6330107,62662.8%
Nov 11, 2026143,71620238,30060.3%
Nov 10, 2026128,28415248,12451.7%
Nov 9, 2026107,56711207,49151.8%
Nov 6, 202690,41599247,72636.5%
Nov 5, 202660,9890155,62439.2%
Nov 4, 202666,9750178,54037.5%
Nov 3, 202649,404081,34260.7%
Nov 2, 202665,2890136,60347.8%
Oct 30, 202645,2931,75295,28247.5%
Oct 29, 202641,0000111,84436.7%
Oct 28, 202632,066076,77441.8%
Oct 27, 202627,797057,10548.7%
Oct 26, 202628,939055,87251.8%
Oct 23, 202657,36323146,98139.0%
Oct 22, 202653,88426678,09069.0%
Oct 21, 202646,668071,94564.9%
Oct 20, 202648,973081,07260.4%
Oct 19, 202643,440062,46869.5%
Oct 16, 202697,856126125,10578.2%
Oct 15, 2026104,819860135,17477.5%
Oct 14, 202667,1214102,73965.3%
Oct 13, 202648,363191,17953.0%
Oct 12, 202651,363165,68478.2%
Oct 9, 202675,3520127,36459.2%
Oct 8, 202689,1480125,65270.9%
Oct 7, 202674,693095,79978.0%
Oct 6, 2026117,7730160,07973.6%
Oct 5, 202657,397077,63073.9%
Oct 2, 202636,321064,65656.2%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in AMG
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T1343,28420,182119,1906,08474.2%
Oct 12, 2026T1429,50121,300173,9795,87471.2%
Oct 5, 2026T1476,11522,084304,4546,48761.0%
Sep 28, 2026T1442,62423,690274,7936,47661.7%
Sep 21, 2026T1396,81922,562194,2216,10567.1%
Sep 14, 2026T1347,18918,778356,7666,39449.3%
Sep 7, 2026T1305,61917,261106,5944,42374.1%
Aug 31, 2026T1483,05024,384308,2116,55361.0%
Aug 24, 2026T1285,70116,312157,6175,49864.4%
Aug 17, 2026T1468,62521,407202,0265,74469.9%
Aug 10, 2026T1355,62616,880152,5315,25370.0%
Aug 3, 2026T1304,48619,177199,2645,88660.4%