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 |
Apple
AAPL
|
$35.2M |
| 2 |
Micron Technology
MU
|
$32.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
$29.5M |
| 4 |
NVIDIA
NVDA
|
$22.9M |
| 5 |
SPDR Dow Jones Industrial Average ETF Trust
DIA
|
$22M |
Top Sells
| 1 |
TWX
Time Warner Inc
TWX
|
$34.8M |
| 2 |
Amazon
AMZN
|
$33.4M |
| 3 |
Tesla
TSLA
|
$19.8M |
| 4 |
Netflix
NFLX
|
$17.7M |
| 5 |
TWTR
Twitter, Inc.
TWTR
|
$13.5M |
Sector Composition
| 1 | Technology | 20.43% |
| 2 | Consumer Discretionary | 15.24% |
| 3 | Communication Services | 12% |
| 4 | Financials | 10.18% |
| 5 | Industrials | 9.87% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Shares Change % | Capital Flow | |
|---|---|---|---|---|---|---|
576
Alarm.com
ALRM
$2.84B
| $332K | ﹤0.01% |
8,234
+1,589
| +24% | +$64.1K |
|
|
ENDP
577
DELISTED
Endo International plc
ENDP
| $331K | ﹤0.01% |
+35,128
| New | +$331K |
|
578
CVR Energy
CVI
$3.16B
| $328K | ﹤0.01% |
+8,870
| New | +$328K |
|
579
Dana Inc
DAN
$2.7B
| $327K | ﹤0.01% |
+16,241
| New | +$327K |
|
580
Evolent Health
EVH
$1.11B
| $327K | ﹤0.01% |
+15,535
| New | +$327K |
|
581
Fortune Brands Innovations
FBIN
$7.3B
| $327K | ﹤0.01% |
7,141
+2,552
| +56% | +$117K |
|
582
Warrior Met Coal
HCC
$3.19B
| $327K | ﹤0.01% |
+11,884
| New | +$327K |
|
583
Paycom
PAYC
$12.6B
| $326K | ﹤0.01% |
3,307
-6,209
| -65% | -$612K |
|
584
Vertex Pharmaceuticals
VRTX
$102B
| $324K | ﹤0.01% |
1,912
-1,911
| -50% | -$324K |
|
|
AXDX
585
DELISTED
Accelerate Diagnostics
AXDX
| $322K | ﹤0.01% |
+1,448
| New | +$322K |
|
586
iShares MSCI Emerging Markets Min Vol Factor ETF
EEMV
$4.61B
| $322K | ﹤0.01% |
+5,584
| New | +$322K |
|
587
SPDR S&P MidCap 400 ETF Trust
MDY
$24B
| $319K | ﹤0.01% |
899
-15,143
| -94% | -$5.37M |
|
588
Brink's
BCO
$4.78B
| $318K | ﹤0.01% |
3,988
+1,696
| +74% | +$135K |
|
589
Packaging Corp of America
PKG
$19.8B
| $317K | ﹤0.01% |
+2,839
| New | +$317K |
|
|
PARA
590
DELISTED
Paramount Global Class B
PARA
| $316K | ﹤0.01% |
5,630
-60,809
| -92% | -$3.41M |
|
591
Tucows
TCX
$198M
| $316K | ﹤0.01% |
5,211
+1,807
| +53% | +$110K |
|
592
iShares Core S&P Mid-Cap ETF
IJH
$101B
| $314K | ﹤0.01% |
8,065
+4,310
| +115% | +$168K |
|
|
QD
593
Qudian
QD
$733M
| $313K | ﹤0.01% |
35,330
+13,589
| +63% | +$120K |
|
594
Duluth Holdings
DLTH
$142M
| $312K | ﹤0.01% |
+13,146
| New | +$312K |
|
595
LyondellBasell Industries
LYB
$17.7B
| $312K | ﹤0.01% |
+2,841
| New | +$312K |
|
596
Clearside Biomedical
CLSD
$27.2M
| $308K | ﹤0.01% |
+28,861
| New | +$308K |
|
597
Direxion Daily Gold Miners Index Bull 2X Shares
NUGT
$847M
| $308K | ﹤0.01% |
2,534
-3,824
| -60% | -$465K |
|
|
FPRX
598
DELISTED
Five Prime Therapeutics, Inc.
FPRX
| $308K | ﹤0.01% |
19,485
+3,931
| +25% | +$62.1K |
|
599
SPDR S&P Oil & Gas Equipment & Services ETF
XES
$155M
| $307K | ﹤0.01% |
+1,811
| New | +$307K |
|
|
MBFI
600
DELISTED
MB Financial Corp
MBFI
| $307K | ﹤0.01% |
+6,590
| New | +$307K |
|