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Affiliated Managers Group, Inc.

MGRB
Exchange
NYSE
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Investment Advice
SEC CIK
0001004434

No open-market purchases or sales by Affiliated Managers Group, Inc. insiders were filed in the last 90 days; 2 institutions reported holding it in 13F filings for Q2 2026, worth $10.9K in total; no superinvestor holds it.

Other share classesAMGMGRMGRDMGRE

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
15.7K
Shares, settlement Oct 30, 2026
Change
−37.4K
−70.5% vs. Oct 15, 2026
Days to cover
1.00
Short interest ÷ average daily volume
Average daily volume
38.8K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 19,473 sharesNov 15, 2024: 14,605 sharesNov 29, 2024: 28,003 sharesDec 13, 2024: 45,233 sharesDec 31, 2024: 120,884 sharesJan 15, 2025: 81,784 sharesJan 31, 2025: 29,647 sharesFeb 14, 2025: 31,624 sharesFeb 28, 2025: 5,119 sharesMar 14, 2025: 1,314 sharesMar 31, 2025: 4,436 sharesApr 15, 2025: 5,348 sharesApr 30, 2025: 19,462 sharesMay 15, 2025: 15,205 sharesMay 30, 2025: 8,983 sharesJun 13, 2025: 2,933 sharesJun 30, 2025: 2,010 sharesJul 15, 2025: 9,117 sharesJul 31, 2025: 9,338 sharesAug 15, 2025: 6,862 sharesAug 29, 2025: 36,899 sharesSep 15, 2025: 21,789 sharesSep 30, 2025: 12,812 sharesOct 15, 2025: 4,812 sharesOct 31, 2025: 1,987 sharesNov 14, 2025: 2,752 sharesNov 28, 2025: 2,434 sharesDec 15, 2025: 14,255 sharesDec 31, 2025: 2,856 sharesJan 15, 2026: 15,024 sharesJan 30, 2026: 12,306 sharesFeb 13, 2026: 15,324 sharesFeb 27, 2026: 26,953 sharesMar 13, 2026: 5,980 sharesMar 31, 2026: 5,837 sharesApr 15, 2026: 10,096 sharesApr 30, 2026: 1,267 sharesMay 15, 2026: 3,318 sharesMay 29, 2026: 14,953 sharesJun 15, 2026: 20,827 sharesJun 30, 2026: 10,163 sharesJul 15, 2026: 40,161 sharesJul 31, 2026: 31,790 sharesAug 14, 2026: 27,657 sharesAug 31, 2026: 22,605 sharesSep 15, 2026: 22,136 sharesSep 30, 2026: 23,384 sharesOct 15, 2026: 53,132 sharesOct 30, 2026: 15,687 shares
Short interest in MGRB by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202615.7K−37.4K−70.5%38.8K1.00
Oct 15, 202653.1K+29.7K+127.2%23.7K2.24
Sep 30, 202623.4K+1.25K+5.6%25.6K1.00
Sep 15, 202622.1K−469−2.1%27.8K1.00
Aug 31, 202622.6K−5.05K−18.3%16.7K1.36
Aug 14, 202627.7K−4.13K−13.0%10.8K2.56
Jul 31, 202631.8K−8.37K−20.8%21.4K1.49
Jul 15, 202640.2K+30.0K+295.2%29.8K1.35
Jun 30, 202610.2K−10.7K−51.2%24.9K1.00
Jun 15, 202620.8K+5.87K+39.3%28.8K1.00
May 29, 202615.0K+11.6K+350.7%16.3K1.00
May 15, 20263.32K+2.05K+161.9%15.0K1.00
Apr 30, 20261.27K−8.83K−87.5%13.0K1.00
Apr 15, 202610.1K+4.26K+73.0%11.8K1.00
Mar 31, 20265.84K−143−2.4%16.8K1.00
Mar 13, 20265.98K−21.0K−77.8%14.3K1.00
Feb 27, 202627.0K+11.6K+75.9%17.1K1.57
Feb 13, 202615.3K+3.02K+24.5%17.0K1.00
Jan 30, 202612.3K−2.72K−18.1%23.6K1.00
Jan 15, 202615.0K+12.2K+426.1%29.0K1.00
Dec 31, 20252.86K−11.4K−80.0%19.0K1.00
Dec 15, 202514.3K+11.8K+485.7%26.9K1.00
Nov 28, 20252.43K−318−11.6%11.4K1.00
Nov 14, 20252.75K+765+38.5%15.2K1.00
Oct 31, 20251.99K−2.83K−58.7%12.0K1.00
Oct 15, 20254.81K−8.00K−62.4%10.1K1.00
Sep 30, 202512.8K−8.98K−41.2%9.12K1.41
Sep 15, 202521.8K−15.1K−41.0%8.04K2.71
Aug 29, 202536.9K+30.0K+437.7%21.6K1.71
Aug 15, 20256.86K−2.48K−26.5%13.1K1.00
Jul 31, 20259.34K+221+2.4%12.1K1.00
Jul 15, 20259.12K+7.11K+353.6%16.4K1.00
Jun 30, 20252.01K−923−31.5%18.7K1.00
Jun 13, 20252.93K−6.05K−67.4%22.2K1.00
May 30, 20258.98K−6.22K−40.9%20.5K1.00
May 15, 202515.2K−4.26K−21.9%25.9K1.00
Apr 30, 202519.5K+14.1K+263.9%36.9K1.00
Apr 15, 20255.35K+912+20.6%53.5K1.00
Mar 31, 20254.44K+3.12K+237.6%12.3K1.00
Mar 14, 20251.31K−3.81K−74.3%13.2K1.00
Feb 28, 20255.12K−26.5K−83.8%15.3K1.00
Feb 14, 202531.6K+1.98K+6.7%9.57K3.30
Jan 31, 202529.6K−52.1K−63.8%16.4K1.81
Jan 15, 202581.8K−39.1K−32.4%33.7K2.42
Dec 31, 2024120.9K+75.7K+167.3%77.4K1.56
Dec 13, 202445.2K+17.2K+61.5%25.1K1.80
Nov 29, 202428.0K+13.4K+91.7%15.9K1.76
Nov 15, 202414.6K−4.87K−25.0%14.3K1.02
Oct 31, 202419.5K+5.87K+43.1%12.1K1.61

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 MGRB by settlement date
Settlement dateSharesPriceValue
Oct 9, 2026278$15.48$4.30K
Oct 1, 20261,278$15.99$20.4K
Sep 8, 2026145$16.25$2.36K
Sep 4, 2026969$16.15$15.6K
Sep 3, 202636$15.87$571.32
Sep 1, 2026129$16.00$2.06K
Aug 31, 2026704$16.09$11.3K
Aug 24, 20261,108$16.17$17.9K
Aug 13, 2026172$16.41$2.82K
Aug 7, 202616$16.59$265.44
Aug 6, 2026210$16.67$3.50K
Aug 5, 2026139$16.76$2.33K
Aug 4, 2026170$16.78$2.85K
Aug 3, 202654$16.76$905.04
Jul 24, 202610$16.78$167.8
Jul 23, 20261,249$16.88$21.1K
Jul 21, 20265,099$17.00$86.7K
Jul 14, 2026178$16.72$2.98K
Jul 9, 2026148$16.35$2.42K
Jun 10, 2026583$16.69$9.73K
Jun 4, 20261,105$16.97$18.8K
Jun 1, 2026590$16.81$9.92K
May 18, 20261,549$16.88$26.1K
May 14, 2026100$16.97$1.70K
May 13, 202614$16.88$236.32
Apr 24, 2026170$16.75$2.85K
Apr 2, 202661$16.07$980.27
Apr 1, 2026314$16.07$5.05K
Mar 27, 202684$16.74$1.41K
Mar 16, 2026215$16.96$3.65K

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 MGRB by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 13, 20265,118015,46733.1%
Nov 12, 20268,8282,40030,19429.2%
Nov 11, 20261,09107,43714.7%
Nov 10, 20262,556013,38019.1%
Nov 9, 20262,941010,54827.9%
Nov 6, 20262,988013,45922.2%
Nov 5, 20264,501014,61830.8%
Nov 4, 20266,8571,69516,26942.1%
Nov 3, 20264,531017,27326.2%
Nov 2, 20265,844019,08530.6%
Oct 30, 20266,316014,59043.3%
Oct 29, 202619,412071,21127.3%
Oct 28, 20263,773010,25136.8%
Oct 27, 20262,74008,36832.7%
Oct 26, 20269,275050,17718.5%
Oct 23, 20262,0281866,98829.0%
Oct 22, 20262,1821008,60125.4%
Oct 21, 20265,48617615,84734.6%
Oct 20, 20265,430012,34644.0%
Oct 19, 20269,35920019,28148.5%
Oct 16, 202617,728024,86771.3%
Oct 15, 20263,625013,33327.2%
Oct 14, 202638,19410048,94978.0%
Oct 13, 20267,0921,09211,35262.5%
Oct 12, 20265,55110514,48238.3%
Oct 9, 202611,066019,44656.9%
Oct 8, 20269,87726020,82147.4%
Oct 7, 20265,66909,75758.1%
Oct 6, 20264,1908011,16837.5%
Oct 5, 20262,5205010,21824.7%

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 MGRB
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T24,2137067,2057355.9%
Sep 28, 2026T27,80815953,53878012.7%
Sep 21, 2026T28,32312177,3746839.7%
Sep 14, 2026T214,25121983,04268114.6%
Sep 7, 2026T22,1893986,1115132.5%
Aug 31, 2026T28,20418257,47560112.5%
Aug 24, 2026T211,84311449,99350719.2%
Aug 17, 2026T21,1973938,4915443.0%
Aug 10, 2026T23,7966842,5615278.2%
Aug 3, 2026T24781322,5496052.1%
Jul 27, 2026T210,78022560,12166715.2%
Jul 20, 2026T25,52238146,65564610.6%