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 | |
|---|---|---|---|---|---|---|
|
WBC
851
PUT
DELISTED
WABCO HOLDINGS INC.
WBC
| $3.02M | 0.01% |
258
+24
| +10% | +$3.05K |
|
|
DOCU
852
CALL
DocuSign
DOCU
$8.98B
| $3.02M | 0.01% |
+570
| New | +$28.8K |
|
853
CALL
Akamai
AKAM
$17.1B
| $3.01M | 0.01% |
411
+54
| +15% | +$4.05K |
|
854
CALL
Vulcan Materials
VMC
$35.7B
| $3.01M | 0.01% |
233
-80
| -26% | -$9.86K |
|
855
PUT
Zillow
Z
$6.77B
| $3.01M | 0.01% |
508
+13
| +3% | +$720 |
|
856
PUT
CSX Corp
CSX
$98.1B
| $3M | 0.01% |
1,413
-4,566
| -76% | -$94K |
|
857
CALL
Johnson Controls International
JCI
$87.4B
| $3M | 0.01% |
898
-2,563
| -74% | -$89K |
|
|
ALXN
858
DELISTED
Alexion Pharmaceuticals
ALXN
| $3M | 0.01% |
24,187
-25,804
| -52% | -$3.02M |
|
|
SODA
859
PUT
DELISTED
SodaStream International Ltd
SODA
| $3M | 0.01% |
352
-164
| -32% | -$14.8K |
|
860
PUT
Jack in the Box
JACK
$263M
| $3M | 0.01% |
352
+226
| +179% | +$19.5K |
|
861
PUT
LyondellBasell Industries
LYB
$19.9B
| $2.99M | 0.01% |
272
+165
| +154% | +$18.1K |
|
862
CALL
United Therapeutics
UTHR
$26.4B
| $2.99M | 0.01% |
264
+134
| +103% | +$14.7K |
|
|
CRC
863
PUT
DELISTED
California Resources Corporation
CRC
| $2.98M | 0.01% |
657
+497
| +311% | +$15.7K |
|
864
CALL
Dropbox
DBX
$6.63B
| $2.97M | 0.01% |
+915
| New | +$28.6K |
|
865
PUT
Zions Bancorporation
ZION
$10.1B
| $2.97M | 0.01% |
563
+432
| +330% | +$23.8K |
|
|
EVHC
866
PUT
DELISTED
Envision Healthcare Holdings Inc
EVHC
| $2.97M | 0.01% |
674
+35
| +5% | +$1.44K |
|
867
CALL
Bath & Body Works
BBWI
$3.9B
| $2.96M | 0.01% |
995
-48,259
| -98% | -$1.39M |
|
868
CALL
Sony
SONY
$122B
| $2.96M | 0.01% |
2,890
-710
| -20% | -$6.91K |
|
869
PUT
Paychex
PAYX
$39.4B
| $2.96M | 0.01% |
433
+127
| +42% | +$8.19K |
|
870
PUT
Dillards
DDS
$8.76B
| $2.96M | 0.01% |
313
-85
| -21% | -$6.92K |
|
871
CALL
AptarGroup
ATR
$8.23B
| $2.95M | 0.01% |
316
+223
| +240% | +$20.8K |
|
872
PUT
Blackbaud
BLKB
$1.44B
| $2.95M | 0.01% |
288
+190
| +194% | +$19.6K |
|
|
BBBY
873
PUT
DELISTED
Bed Bath & Beyond Inc
BBBY
| $2.95M | 0.01% |
1,479
+1,279
| +640% | +$23.9K |
|
874
PUT
MarketAxess Holdings
MKTX
$4.06B
| $2.93M | 0.01% |
+148
| New | +$30.7K |
|
875
PUT
Restaurant Brands International
QSR
$25.1B
| $2.92M | 0.01% |
485
+135
| +39% | +$7.73K |
|
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.