Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| 1 |
LNKD
LinkedIn Corporation
LNKD
|
+$29.3M |
| 2 |
SPDR Gold Trust
GLD
|
+$18.1M |
| 3 |
QIHU
QIHOO 360 TECHNOLOGY CO LTD ADS RPSTG 3 CL A SHS
QIHU
|
+$14.9M |
| 4 |
Biogen
BIIB
|
+$13.7M |
| 5 |
Visa
V
|
+$13.3M |
Top Sells
| 1 |
Broadcom
AVGO
|
+$37.4M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$20.1M |
| 3 |
iShares MSCI Emerging Markets ETF
EEM
|
+$15.8M |
| 4 |
Citigroup
C
|
+$13.9M |
| 5 |
SPDR S&P MidCap 400 ETF Trust
MDY
|
+$12.9M |
Sector Composition
| 1 | Communication Services | 12.51% |
| 2 | Healthcare | 12.38% |
| 3 | Technology | 12.22% |
| 4 | Consumer Discretionary | 8.59% |
| 5 | Financials | 8.53% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
526
Alliant Energy
LNT
$16.4B
| $191K | 0.01% |
+4,816
| New | +$191K |
|
527
Lindsay Corp
LNN
$1.48B
| $189K | 0.01% |
2,794
+2,084
| +294% | +$141K |
|
|
AUY
528
DELISTED
Yamana Gold, Inc.
AUY
| $189K | 0.01% |
36,538
+28,038
| +330% | +$145K |
|
529
Lear
LEA
$5.78B
| $188K | 0.01% |
1,854
+1,687
| +1,010% | +$171K |
|
530
LG Display
LPL
$4.34B
| $188K | 0.01% |
+16,263
| New | +$188K |
|
|
EEP
531
DELISTED
Enbridge Energy Partners
EEP
| $188K | 0.01% |
+8,140
| New | +$188K |
|
532
Ironwood Pharmaceuticals
IRWD
$175M
| $187K | 0.01% |
+17,103
| New | +$187K |
|
|
WBMD
533
DELISTED
WebMD Health Corp.
WBMD
| $187K | 0.01% |
3,226
-18,364
| -85% | -$1.06M |
|
|
SCNB
534
DELISTED
Suffolk Bancorp
SCNB
| $187K | 0.01% |
+5,974
| New | +$187K |
|
535
ProShares UltraShort Yen
YCS
$30.6M
| $186K | 0.01% |
+11,736
| New | +$186K |
|
536
LivePerson
LPSN
$92.7M
| $185K | 0.01% |
+29,244
| New | +$185K |
|
|
DRE
537
DELISTED
Duke Realty Corp.
DRE
| $185K | 0.01% |
6,951
+4,000
| +136% | +$106K |
|
538
NCR Voyix
VYX
$1.76B
| $182K | 0.01% |
+10,704
| New | +$182K |
|
539
Gold Fields
GFI
$33.4B
| $181K | 0.01% |
36,998
+17,296
| +88% | +$84.6K |
|
|
KS
540
DELISTED
KapStone Paper and Pack Corp.
KS
| $181K | 0.01% |
13,989
-79,044
| -85% | -$1.02M |
|
541
Plexus
PLXS
$3.7B
| $178K | 0.01% |
4,132
+1,196
| +41% | +$51.5K |
|
|
SVU
542
DELISTED
SUPERVALU Inc.
SVU
| $178K | 0.01% |
5,389
+4,959
| +1,153% | +$164K |
|
543
First Majestic Silver
AG
$4.48B
| $177K | 0.01% |
+13,098
| New | +$177K |
|
544
NovaGold Resources
NG
$2.75B
| $177K | 0.01% |
28,990
+16,463
| +131% | +$101K |
|
545
ArcelorMittal
MT
$26.4B
| $176K | 0.01% |
+12,656
| New | +$176K |
|
546
VanEck Pharmaceutical ETF
PPH
$627M
| $176K | 0.01% |
3,012
+2,299
| +322% | +$134K |
|
547
Qualys
QLYS
$4.78B
| $175K | 0.01% |
5,880
+5,552
| +1,693% | +$165K |
|
|
ZBIO
548
DELISTED
ProShares UltraPro Short NASDAQ Biotechnology
ZBIO
| $175K | 0.01% |
2,720
-2,811
| -51% | -$181K |
|
|
TLN
549
DELISTED
Talen Energy Corporation
TLN
| $174K | 0.01% |
12,883
+12,551
| +3,780% | +$170K |
|
550
Apollo Global Management
APO
$77.7B
| $173K | 0.01% |
11,424
-3,997
| -26% | -$60.5K |
|