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 |
Alphabet (Google) Class C
GOOG
|
+$54.6M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$52.5M |
| 3 |
SPDR S&P 500 ETF Trust
SPY
|
+$40.9M |
| 4 |
Apple
AAPL
|
+$16.5M |
| 5 |
Visa
V
|
+$12M |
Top Sells
| 1 |
Amazon
AMZN
|
+$98.7M |
| 2 |
Meta Platforms (Facebook)
META
|
+$70.7M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$33.4M |
| 4 |
Goldman Sachs
GS
|
+$30.2M |
| 5 |
Boeing
BA
|
+$26.5M |
Sector Composition
| 1 | Communication Services | 14.71% |
| 2 | Consumer Discretionary | 14.32% |
| 3 | Technology | 11.86% |
| 4 | Financials | 7.38% |
| 5 | Industrials | 6.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
|
ENDP
526
DELISTED
Endo International plc
ENDP
| $276K | ﹤0.01% |
37,889
+25,386
| +203% | +$185K |
|
527
iShares MSCI China ETF
MCHI
$8.1B
| $274K | ﹤0.01% |
+5,214
| New | +$274K |
|
528
PDF Solutions
PDFS
$783M
| $273K | ﹤0.01% |
32,461
-24,548
| -43% | -$206K |
|
529
Tennant Co
TNC
$1.48B
| $273K | ﹤0.01% |
5,241
+4,837
| +1,197% | +$252K |
|
530
Boston Beer
SAM
$2.37B
| $272K | ﹤0.01% |
1,131
-443
| -28% | -$107K |
|
|
NVRO
531
DELISTED
NEVRO CORP.
NVRO
| $271K | ﹤0.01% |
+6,981
| New | +$271K |
|
|
BHVN
532
DELISTED
Biohaven Pharmaceutical Holding Company Ltd.
BHVN
| $271K | ﹤0.01% |
7,338
+3,152
| +75% | +$116K |
|
533
Fiserv
FI
$72.7B
| $269K | ﹤0.01% |
+3,665
| New | +$269K |
|
534
KNOT Offshore Partners
KNOP
$304M
| $269K | ﹤0.01% |
+15,009
| New | +$269K |
|
535
Navigator Holdings
NVGS
$1.11B
| $268K | ﹤0.01% |
28,530
+27,266
| +2,157% | +$256K |
|
536
Shake Shack
SHAK
$3.92B
| $268K | ﹤0.01% |
5,907
+3,179
| +117% | +$144K |
|
537
iPath Bloomberg Commodity Index Total Return ETN due 12 June 2036
DJP
$587M
| $267K | ﹤0.01% |
12,622
-22,127
| -64% | -$468K |
|
538
Vanda Pharmaceuticals
VNDA
$267M
| $266K | ﹤0.01% |
10,207
-57,379
| -85% | -$1.5M |
|
539
DXC Technology
DXC
$2.55B
| $265K | ﹤0.01% |
4,989
+4,167
| +507% | +$221K |
|
540
American Axle
AXL
$705M
| $263K | ﹤0.01% |
+23,740
| New | +$263K |
|
541
1-800-Flowers.com
FLWS
$323M
| $263K | ﹤0.01% |
21,521
-4,593
| -18% | -$56.1K |
|
542
Energizer
ENR
$1.93B
| $261K | ﹤0.01% |
+5,781
| New | +$261K |
|
543
CGI
GIB
$21.2B
| $261K | ﹤0.01% |
+4,267
| New | +$261K |
|
544
Steven Madden
SHOO
$2.19B
| $261K | ﹤0.01% |
+8,638
| New | +$261K |
|
545
Vanguard Health Care ETF
VHT
$15.6B
| $261K | ﹤0.01% |
+1,627
| New | +$261K |
|
|
VG
546
DELISTED
Vonage Holdings Corporation
VG
| $260K | ﹤0.01% |
29,874
+29,583
| +10,166% | +$257K |
|
547
Global Payments
GPN
$20.8B
| $259K | ﹤0.01% |
2,516
+2,003
| +390% | +$206K |
|
548
Nokia
NOK
$24.6B
| $258K | ﹤0.01% |
44,401
+28,100
| +172% | +$163K |
|
549
Toll Brothers
TOL
$13.8B
| $257K | ﹤0.01% |
+7,821
| New | +$257K |
|
550
Stoneridge
SRI
$228M
| $256K | ﹤0.01% |
10,425
+10,279
| +7,040% | +$252K |
|