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
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2901
CALL
Gartner
IT
$9.41B
| $332K | ﹤0.01% |
25
+6
| +32% | +$768 |
|
2902
CALL
Nomad Foods
NOMD
$1.64B
| $331K | ﹤0.01% |
+173
| New | +$2.99K |
|
|
ENDP
2903
DELISTED
Endo International plc
ENDP
| $331K | ﹤0.01% |
+35,128
| New | +$236K |
|
|
CARB
2904
CALL
DELISTED
Carbonite Inc
CARB
| $331K | ﹤0.01% |
+95
| New | +$3.26K |
|
2905
CALL
CNX Resources
CNX
$4.85B
| $330K | ﹤0.01% |
273
-611
| -69% | -$9.8K |
|
2906
PUT
ArcBest
ARCB
$3.44B
| $329K | ﹤0.01% |
+72
| New | +$2.97K |
|
|
WRD
2907
PUT
DELISTED
WildHorse Resource Development
WRD
| $329K | ﹤0.01% |
130
-708
| -84% | -$17.7K |
|
2908
PUT
Criteo
CRTO
$1.03B
| $328K | ﹤0.01% |
100
-12
| -11% | -$331 |
|
2909
CVR Energy
CVI
$3.36B
| $328K | ﹤0.01% |
+8,870
| New | +$335K |
|
2910
CALL
Ovintiv
OVV
$17.5B
| $328K | ﹤0.01% |
50
-17
| -25% | -$1.07K |
|
|
CTRL
2911
PUT
DELISTED
Control4 Corporation
CTRL
| $328K | ﹤0.01% |
135
+94
| +229% | +$2.2K |
|
2912
Dana Inc
DAN
$2.91B
| $327K | ﹤0.01% |
+16,241
| New | +$386K |
|
2913
Evolent Health
EVH
$475M
| $327K | ﹤0.01% |
+15,535
| New | +$294K |
|
2914
Fortune Brands Innovations
FBIN
$6.12B
| $327K | ﹤0.01% |
7,141
+2,552
| +56% | +$124K |
|
2915
Warrior Met Coal
HCC
$4.23B
| $327K | ﹤0.01% |
+11,884
| New | +$313K |
|
2916
Paycom
PAYC
$6.78B
| $326K | ﹤0.01% |
3,307
-6,209
| -65% | -$670K |
|
2917
PUT
American Electric Power
AEP
$73.7B
| $325K | ﹤0.01% |
47
+6
| +15% | +$404 |
|
2918
CALL
Glaukos
GKOS
$9.02B
| $325K | ﹤0.01% |
+80
| New | +$2.85K |
|
2919
PUT
Trex
TREX
$4.51B
| $325K | ﹤0.01% |
104
+40
| +63% | +$1.16K |
|
|
STML
2920
PUT
DELISTED
Stemline Therapeutics, Inc.
STML
| $325K | ﹤0.01% |
203
+26
| +15% | +$464 |
|
2921
CALL
American Water Works
AWK
$26.3B
| $324K | ﹤0.01% |
38
+25
| +192% | +$2.07K |
|
2922
PUT
Coherus Oncology
CHRS
$217M
| $324K | ﹤0.01% |
+232
| New | +$3.32K |
|
2923
PUT
Enovis
ENOV
$1.56B
| $324K | ﹤0.01% |
62
+56
| +933% | +$3.03K |
|
2924
PUT
Logitech
LOGI
$15.2B
| $324K | ﹤0.01% |
74
-246
| -77% | -$9.93K |
|
2925
Vertex Pharmaceuticals
VRTX
$121B
| $324K | ﹤0.01% |
1,912
-1,911
| -50% | -$296K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.