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 | |
|---|---|---|---|---|---|---|
751
CALL
Tenet Healthcare
THC
$20.1B
| $467K | 0.02% |
796
-239
| -23% | -$4.76K |
|
|
SBNY
752
DELISTED
Signature Bank
SBNY
| $467K | 0.02% |
3,293
-125
| -4% | -$18.8K |
|
|
ATH
753
DELISTED
Athene Holding Ltd. Class A Common Shares
ATH
| $466K | 0.02% |
+9,759
| New | +$486K |
|
754
Dycom Industries
DY
$12.9B
| $465K | 0.02% |
4,325
+1,157
| +37% | +$131K |
|
755
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $462K | 0.02% |
19,577
-28,950
| -60% | -$682K |
|
756
Nutrien
NTR
$32.7B
| $461K | 0.02% |
+9,760
| New | +$489K |
|
757
CALL
Teledyne Technologies
TDY
$30.4B
| $461K | 0.02% |
+2,421
| New | +$457K |
|
758
CALL
Merck
MRK
$324B
| $459K | 0.02% |
5,613
+2,874
| +105% | +$155K |
|
|
WRD
759
CALL
DELISTED
WildHorse Resource Development
WRD
| $458K | 0.02% |
20,417
+20,203
| +9,441% | +$360K |
|
760
CALL
Macerich
MAC
$7.32B
| $457K | 0.02% |
8,160
+7,705
| +1,693% | +$470K |
|
761
Zillow
Z
$7.04B
| $455K | 0.02% |
+8,460
| New | +$408K |
|
762
Immersion
IMMR
$216M
| $453K | 0.02% |
37,945
-1,896
| -5% | -$19.2K |
|
763
Thor Industries
THO
$3.99B
| $453K | 0.02% |
+3,934
| New | +$526K |
|
764
Ametek
AME
$55.5B
| $452K | 0.02% |
5,962
-5,609
| -48% | -$426K |
|
765
Edison International
EIX
$30.7B
| $452K | 0.02% |
7,101
-6,697
| -49% | -$412K |
|
766
Kratos Defense & Security Solutions
KTOS
$8.88B
| $451K | 0.02% |
43,889
+38,210
| +673% | +$426K |
|
767
Essential Utilities
WTRG
$11.2B
| $449K | 0.02% |
13,192
+11,666
| +764% | +$406K |
|
|
OSG
768
Octave Specialty Group
OSG
$252M
| $448K | 0.02% |
28,630
+2,091
| +8% | +$32.3K |
|
769
iShares MSCI China ETF
MCHI
$6.04B
| $448K | 0.02% |
+6,535
| New | +$464K |
|
770
Calix
CALX
$2.3B
| $446K | 0.02% |
65,182
+42,366
| +186% | +$274K |
|
771
Carriage Services
CSV
$618M
| $446K | 0.02% |
+16,144
| New | +$436K |
|
772
PUT
ProShares Ultra S&P500
SSO
$7.82B
| $446K | 0.02% |
12,448
-2,160
| -15% | -$30.7K |
|
773
Dollar General
DG
$25.9B
| $443K | 0.02% |
4,744
-12,888
| -73% | -$1.24M |
|
774
CALL
Macy's
M
$6.15B
| $443K | 0.02% |
2,365
-2,129
| -47% | -$57.5K |
|
|
XLNX
775
PUT
DELISTED
Xilinx Inc
XLNX
| $442K | 0.02% |
482
-214
| -31% | -$15.4K |
|
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.