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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
976
CALL
Corning
GLW
$126B
| $308K | 0.01% |
603
-546
| -48% | -$16.8K |
|
977
CALL
McDonald's
MCD
$188B
| $308K | 0.01% |
2,790
+1,569
| +129% | +$258K |
|
978
Highwoods Properties
HIW
$3.71B
| $307K | 0.01% |
+7,025
| New | +$318K |
|
979
Pilgrim's Pride
PPC
$6.82B
| $307K | 0.01% |
+12,496
| New | +$335K |
|
980
CALL
ScottsMiracle-Gro
SMG
$4.03B
| $306K | 0.01% |
3,583
+3,497
| +4,066% | +$333K |
|
|
SC
981
PUT
DELISTED
SANTANDER CONSUMER USA HOLDINGS INC
SC
| $306K | 0.01% |
1,779
+1,166
| +190% | +$20.2K |
|
982
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $305K | 0.01% |
726
-396
| -35% | -$46.8K |
|
983
Insperity
NSP
$1.85B
| $304K | 0.01% |
4,377
+1
| +0% | +$64 |
|
|
S
984
PUT
DELISTED
Sprint Corporation
S
| $303K | 0.01% |
1,441
-324
| -18% | -$1.73K |
|
985
Lifecore Biomedical
LFCR
$162M
| $302K | 0.01% |
23,176
+23,020
| +14,756% | +$302K |
|
986
PUT
Las Vegas Sands
LVS
$30.5B
| $302K | 0.01% |
965
-2,238
| -70% | -$164K |
|
987
SK Telecom
SKM
$13.7B
| $302K | 0.01% |
+7,602
| New | +$322K |
|
|
RAD
988
DELISTED
Rite Aid Corporation
RAD
| $302K | 0.01% |
8,991
+8,524
| +1,825% | +$337K |
|
989
PUT
Valero Energy
VLO
$89.8B
| $301K | 0.01% |
2,451
-179
| -7% | -$16.7K |
|
990
PUT
PG&E
PCG
$47.8B
| $300K | 0.01% |
887
-742
| -46% | -$31.5K |
|
991
PUT
TripAdvisor
TRIP
$1.59B
| $298K | 0.01% |
717
-1,192
| -62% | -$46.6K |
|
992
CALL
Winnebago Industries
WGO
$870M
| $298K | 0.01% |
7,852
+7,642
| +3,639% | +$352K |
|
993
PUT
American Airlines Group
AAL
$9.58B
| $294K | 0.01% |
1,613
-1,908
| -54% | -$102K |
|
994
Abercrombie & Fitch
ANF
$4.17B
| $293K | 0.01% |
12,117
-9,244
| -43% | -$195K |
|
995
CALL
Axos Financial
AX
$5.45B
| $293K | 0.01% |
328
+86
| +36% | +$3.13K |
|
996
PUT
AB InBev
BUD
$158B
| $293K | 0.01% |
989
-92
| -9% | -$10.2K |
|
997
PUT
Lennar Class B
LEN.B
$20B
| $293K | 0.01% |
1,590
+1,197
| +305% | +$57K |
|
998
CALL
Altria Group
MO
$122B
| $293K | 0.01% |
2,020
-154
| -7% | -$10.2K |
|
999
Digital Realty Trust
DLR
$73.7B
| $292K | 0.01% |
+2,780
| New | +$293K |
|
1000
Karyopharm Therapeutics
KPTI
$168M
| $292K | 0.01% |
1,454
+1,011
| +228% | +$202K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.