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 | |
|---|---|---|---|---|---|---|
976
CALL
Dover
DOV
$26.6B
| $2.55M | 0.01% |
348
+323
| +1,292% | +$24.7K |
|
977
PUT
Jacobs Solutions
J
$15.6B
| $2.54M | 0.01% |
485
-132
| -21% | -$6.79K |
|
|
ALOG
978
PUT
DELISTED
Analogic Corp
ALOG
| $2.54M | 0.01% |
303
+186
| +159% | +$15.8K |
|
979
PUT
Chubb
CB
$137B
| $2.54M | 0.01% |
200
+32
| +19% | +$4.25K |
|
980
CALL
Energy Transfer Partners
ET
$70.3B
| $2.54M | 0.01% |
1,473
+187
| +15% | +$3.07K |
|
981
CALL
M&T Bank
MTB
$35.6B
| $2.54M | 0.01% |
149
-1
| -0.7% | -$179 |
|
982
PUT
Canadian Pacific Kansas City
CP
$82B
| $2.52M | 0.01% |
690
+545
| +376% | +$20K |
|
983
CALL
Petrobras
PBR
$122B
| $2.52M | 0.01% |
2,513
-2,037
| -45% | -$26.1K |
|
984
Check Point Software Technologies
CHKP
$13.1B
| $2.51M | 0.01% |
25,688
+20,069
| +357% | +$1.99M |
|
985
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$294M
| $2.51M | 0.01% |
69,720
-1,178
| -2% | -$44.1K |
|
986
PUT
Allegiant Air
ALGT
$2.54B
| $2.5M | 0.01% |
+180
| New | +$27.8K |
|
987
PUT
PNC Financial Services
PNC
$99.5B
| $2.5M | 0.01% |
185
| – | – |
|
988
CALL
Zoetis
ZTS
$31.3B
| $2.5M | 0.01% |
293
-36
| -11% | -$3.04K |
|
|
LM
989
PUT
DELISTED
Legg Mason, Inc.
LM
| $2.48M | 0.01% |
713
+691
| +3,141% | +$26.2K |
|
|
DISH
990
CALL
DELISTED
DISH Network Corp.
DISH
| $2.47M | 0.01% |
735
+271
| +58% | +$9.24K |
|
991
PUT
International Paper
IP
$20.1B
| $2.47M | 0.01% |
501
+112
| +29% | +$5.72K |
|
992
CALL
Teledyne Technologies
TDY
$30.2B
| $2.47M | 0.01% |
124
-2,297
| -95% | -$453K |
|
993
Chipotle Mexican Grill
CMG
$41.1B
| $2.47M | 0.01% |
285,850
+132,550
| +86% | +$1.08M |
|
994
Lennar Class A
LEN
$19.8B
| $2.46M | 0.01% |
48,386
+5,806
| +14% | +$304K |
|
995
CALL
PACCAR
PCAR
$68.8B
| $2.46M | 0.01% |
596
+471
| +377% | +$20.4K |
|
|
AXON
996
CALL
Axon Enterprise
AXON
$39.6B
| $2.46M | 0.01% |
389
+24
| +7% | +$1.3K |
|
997
PUT
Melco Resorts & Entertainment
MLCO
$2.16B
| $2.45M | 0.01% |
876
-164
| -16% | -$5.02K |
|
998
CALL
HF Sinclair
DINO
$16.1B
| $2.45M | 0.01% |
358
+224
| +167% | +$14.9K |
|
999
CALL
Mid-America Apartment Communities
MAA
$15.5B
| $2.45M | 0.01% |
+243
| New | +$22.7K |
|
|
MRO
1000
CALL
DELISTED
Marathon Oil Corporation
MRO
| $2.45M | 0.01% |
1,173
+1,009
| +615% | +$19.9K |
|
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.