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SEI Investments Co

SEIC
Exchange
Nasdaq
Industry
Security Brokers, Dealers & Flotation Companies
SEC CIK
0000350894

In the last 90 days, SEI Investments Co insiders filed 0 open-market purchases and 6 sales; 580 institutions reported holding it in 13F filings for Q2 2026, worth $7.95B in total; Markel Group is the only superinvestor holding it.

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
4.04M
Shares, settlement Oct 30, 2026
Change
+627.4K
+18.4% vs. Oct 15, 2026
Days to cover
4.91
Short interest ÷ average daily volume
Average daily volume
823.1K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 1,560,150 sharesNov 15, 2024: 1,606,023 sharesNov 29, 2024: 1,344,775 sharesDec 13, 2024: 1,644,442 sharesDec 31, 2024: 1,551,371 sharesJan 15, 2025: 1,809,811 sharesJan 31, 2025: 1,616,011 sharesFeb 14, 2025: 1,591,668 sharesFeb 28, 2025: 2,056,135 sharesMar 14, 2025: 2,505,972 sharesMar 31, 2025: 3,261,282 sharesApr 15, 2025: 3,568,364 sharesApr 30, 2025: 3,411,594 sharesMay 15, 2025: 3,479,185 sharesMay 30, 2025: 2,825,948 sharesJun 13, 2025: 2,365,279 sharesJun 30, 2025: 1,895,662 sharesJul 15, 2025: 1,820,242 sharesJul 31, 2025: 1,570,331 sharesAug 15, 2025: 1,814,033 sharesAug 29, 2025: 1,994,388 sharesSep 15, 2025: 2,109,881 sharesSep 30, 2025: 1,761,393 sharesOct 15, 2025: 2,304,715 sharesOct 31, 2025: 1,964,744 sharesNov 14, 2025: 1,749,905 sharesNov 28, 2025: 1,703,739 sharesDec 15, 2025: 1,573,905 sharesDec 31, 2025: 1,467,483 sharesJan 15, 2026: 1,491,896 sharesJan 30, 2026: 1,570,428 sharesFeb 13, 2026: 1,611,292 sharesFeb 27, 2026: 1,638,172 sharesMar 13, 2026: 2,022,624 sharesMar 31, 2026: 2,193,341 sharesApr 15, 2026: 2,192,748 sharesApr 30, 2026: 2,072,667 sharesMay 15, 2026: 2,234,656 sharesMay 29, 2026: 2,317,551 sharesJun 15, 2026: 2,259,303 sharesJun 30, 2026: 2,518,407 sharesJul 15, 2026: 2,388,271 sharesJul 31, 2026: 2,070,528 sharesAug 14, 2026: 1,811,065 sharesAug 31, 2026: 2,148,929 sharesSep 15, 2026: 2,332,194 sharesSep 30, 2026: 3,091,808 sharesOct 15, 2026: 3,412,979 sharesOct 30, 2026: 4,040,334 shares
Short interest in SEIC by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20264.04M+627.4K+18.4%823.1K4.91
Oct 15, 20263.41M+321.2K+10.4%738.2K4.62
Sep 30, 20263.09M+759.6K+32.6%1.03M3.00
Sep 15, 20262.33M+183.3K+8.5%687.0K3.39
Aug 31, 20262.15M+337.9K+18.7%645.8K3.33
Aug 14, 20261.81M−259.5K−12.5%516.9K3.50
Jul 31, 20262.07M−317.7K−13.3%895.7K2.31
Jul 15, 20262.39M−130.1K−5.2%682.1K3.50
Jun 30, 20262.52M+259.1K+11.5%748.8K3.36
Jun 15, 20262.26M−58.2K−2.5%540.3K4.18
May 29, 20262.32M+82.9K+3.7%650.8K3.56
May 15, 20262.23M+162.0K+7.8%660.5K3.38
Apr 30, 20262.07M−120.1K−5.5%1.39M1.49
Apr 15, 20262.19M−5930.0%890.7K2.46
Mar 31, 20262.19M+170.7K+8.4%779.2K2.81
Mar 13, 20262.02M+384.5K+23.5%999.7K2.02
Feb 27, 20261.64M+26.9K+1.7%612.7K2.67
Feb 13, 20261.61M+40.9K+2.6%898.9K1.79
Jan 30, 20261.57M+78.5K+5.3%718.3K2.19
Jan 15, 20261.49M+24.4K+1.7%568.1K2.63
Dec 31, 20251.47M−106.4K−6.8%628.3K2.34
Dec 15, 20251.57M−129.8K−7.6%547.0K2.88
Nov 28, 20251.70M−46.2K−2.6%566.9K3.01
Nov 14, 20251.75M−214.8K−10.9%528.3K3.31
Oct 31, 20251.96M−340.0K−14.8%739.3K2.66
Oct 15, 20252.30M+543.3K+30.9%718.0K3.21
Sep 30, 20251.76M−348.5K−16.5%907.6K1.94
Sep 15, 20252.11M+115.5K+5.8%639.3K3.30
Aug 29, 20251.99M+180.4K+9.9%563.6K3.54
Aug 15, 20251.81M+243.7K+15.5%610.3K2.97
Jul 31, 20251.57M−249.9K−13.7%1.10M1.43
Jul 15, 20251.82M−75.4K−4.0%802.4K2.27
Jun 30, 20251.90M−469.6K−19.9%1.04M1.82
Jun 13, 20252.37M−460.7K−16.3%956.1K2.47
May 30, 20252.83M−653.2K−18.8%1.73M1.63
May 15, 20253.48M+67.6K+2.0%659.1K5.28
Apr 30, 20253.41M−156.8K−4.4%804.2K4.24
Apr 15, 20253.57M+307.1K+9.4%886.7K4.02
Mar 31, 20253.26M+755.3K+30.1%925.5K3.52
Mar 14, 20252.51M+449.8K+21.9%795.0K3.15
Feb 28, 20252.06M+464.5K+29.2%683.0K3.01
Feb 14, 20251.59M−24.3K−1.5%472.6K3.37
Jan 31, 20251.62M−193.8K−10.7%611.4K2.64
Jan 15, 20251.81M+258.4K+16.7%561.1K3.23
Dec 31, 20241.55M−93.1K−5.7%741.7K2.09
Dec 13, 20241.64M+299.7K+22.3%678.5K2.42
Nov 29, 20241.34M−261.2K−16.3%650.5K2.07
Nov 15, 20241.61M+45.9K+2.9%614.4K2.61
Oct 31, 20241.56M−160.4K−9.3%908.9K1.72

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 SEIC by settlement date
Settlement dateSharesPriceValue
Oct 9, 202680$103.25$8.26K
Sep 21, 202618,897$105.20$1.99M
Sep 2, 20262$109.54$219.08
Aug 17, 2026202$106.38$21.5K
Aug 14, 2026130$106.39$13.8K
Aug 5, 20266$104.72$628.32
Jul 27, 2026660$99.22$65.5K
Jul 22, 2026112$97.65$10.9K
Jul 20, 202663$99.25$6.25K
Jul 17, 2026370$100.26$37.1K
Jul 13, 20266,383$95.45$609.3K
Jul 10, 202650$94.73$4.74K
Jul 8, 2026566$95.94$54.3K
Jul 7, 202636,128$94.99$3.43M
Jul 1, 2026155$87.71$13.6K
Jun 30, 2026128$86.49$11.1K
Jun 29, 20266,628$87.25$578.3K
Jun 25, 202631$88.89$2.76K
Jun 22, 2026558$89.44$49.9K
Jun 15, 202675$89.40$6.71K
Jun 8, 2026675$89.42$60.4K
Jun 5, 20264,718$88.58$417.9K
Jun 3, 20264$87.77$351.08
Jun 2, 202656$88.32$4.95K
May 20, 20265$91.04$455.2
May 19, 202638,758$92.01$3.57M
May 13, 20263$92.29$276.87
May 7, 20263$91.17$273.51
Apr 30, 20262$90.87$181.74
Apr 28, 2026271$91.06$24.7K

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 SEIC by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 12, 202678,1980135,65657.6%
Nov 11, 2026100,5570149,30767.3%
Nov 10, 2026132,81490195,78067.8%
Nov 9, 2026128,5710185,38869.4%
Nov 6, 2026110,08412173,25163.5%
Nov 5, 2026120,2250220,43654.5%
Nov 4, 202696,9460148,95865.1%
Nov 3, 2026134,2580257,00852.2%
Nov 2, 2026119,03366181,03865.8%
Oct 30, 2026121,5070176,00769.0%
Oct 29, 2026108,21376163,53366.2%
Oct 28, 2026150,109237237,32763.2%
Oct 27, 2026133,3690224,15859.5%
Oct 26, 2026182,81311397,92645.9%
Oct 23, 2026193,7093,179540,49735.8%
Oct 22, 2026287,478581644,07744.6%
Oct 21, 2026115,625314205,57956.2%
Oct 20, 2026121,944375244,74249.8%
Oct 19, 202691,802141227,40640.4%
Oct 16, 2026128,01237249,30651.3%
Oct 15, 2026184,498727424,24243.5%
Oct 14, 2026242,403166295,85581.9%
Oct 13, 2026251,57520343,59173.2%
Oct 12, 2026154,859383241,72364.1%
Oct 9, 2026211,9620286,20774.1%
Oct 8, 202695,6427146,10765.5%
Oct 7, 2026133,74817191,09470.0%
Oct 6, 2026272,374149347,69978.3%
Oct 5, 2026160,141493237,45367.4%
Oct 2, 2026116,2511191,91860.6%

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 SEIC
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 19, 2026T11,513,94035,000371,79011,38480.3%
Oct 12, 2026T11,239,15332,101419,0779,51574.7%
Oct 5, 2026T1917,82225,485403,8069,79469.4%
Sep 28, 2026T1763,98927,854293,8688,36572.2%
Sep 21, 2026T11,360,10438,840605,3779,67069.2%
Sep 14, 2026T11,024,48534,3601,305,3529,86044.0%
Sep 7, 2026T1839,48227,945209,3827,14980.0%
Aug 31, 2026T11,003,63524,051335,6278,85574.9%
Aug 24, 2026T1875,47827,076382,6508,23369.6%
Aug 17, 2026T1791,91423,431420,8876,73765.3%
Aug 10, 2026T1579,77021,171288,0877,26166.8%
Aug 3, 2026T1774,60525,715352,7657,57668.7%