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 | |
|---|---|---|---|---|---|---|
|
SGMO
801
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $421K | 0.02% |
531
+421
| +383% | +$9K |
|
802
CALL
First Solar
FSLR
$21.8B
| $420K | 0.02% |
760
-202
| -21% | -$13.7K |
|
803
Aflac
AFL
$63.9B
| $419K | 0.02% |
9,593
-34,091
| -78% | -$1.51M |
|
804
CALL
United Parcel Service
UPS
$97.6B
| $419K | 0.02% |
3,477
+1,066
| +44% | +$123K |
|
|
FTR
805
PUT
DELISTED
Frontier Communications Corp.
FTR
| $418K | 0.02% |
1,195
-428
| -26% | -$3.33K |
|
806
CALL
Alnylam Pharmaceuticals
ALNY
$36.3B
| $417K | 0.02% |
161
-121
| -43% | -$15.6K |
|
807
CALL
General Dynamics
GD
$105B
| $416K | 0.02% |
209
-290
| -58% | -$63.1K |
|
808
CALL
Sarepta Therapeutics
SRPT
$1.66B
| $416K | 0.02% |
245
-431
| -64% | -$28.7K |
|
809
ProShares Short 20+ Year Treasury ETF
TBF
$84.9M
| $415K | 0.02% |
+18,322
| New | +$421K |
|
810
Crown Holdings
CCK
$12.8B
| $414K | 0.02% |
8,176
+2,886
| +55% | +$154K |
|
811
PUT
Rio Tinto
RIO
$148B
| $414K | 0.02% |
1,072
-89
| -8% | -$4.85K |
|
|
TGI
812
DELISTED
Triumph Group
TGI
| $414K | 0.02% |
+16,464
| New | +$448K |
|
813
CALL
General Motors
GM
$74.7B
| $412K | 0.02% |
5,994
+856
| +17% | +$34.7K |
|
814
PUT
Medtronic
MDT
$107B
| $412K | 0.02% |
1,332
+206
| +18% | +$17K |
|
815
Novanta
NOVT
$5.04B
| $412K | 0.02% |
7,914
+1,475
| +23% | +$80.8K |
|
|
ARNA
816
CALL
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $412K | 0.02% |
496
+24
| +5% | +$934 |
|
|
CLDT
817
Chatham Lodging
CLDT
$630M
| $411K | 0.02% |
+21,497
| New | +$447K |
|
818
PUT
3M
MMM
$89B
| $411K | 0.02% |
3,278
-1,683
| -34% | -$333K |
|
819
CALL
Nektar Therapeutics
NKTR
$2.39B
| $411K | 0.02% |
8
-25
| -76% | -$32.2K |
|
820
PUT
Riot Platforms
RIOT
$8.52B
| $409K | 0.02% |
602
-591
| -50% | -$8.24K |
|
821
PUT
Trip.com Group
TCOM
$27.5B
| $409K | 0.02% |
1,738
-1,710
| -50% | -$80.2K |
|
822
PUT
FerroAtlántica
GSM
$628M
| $407K | 0.02% |
964
+754
| +359% | +$11.5K |
|
823
CALL
HCA Healthcare
HCA
$84.8B
| $407K | 0.02% |
318
-5
| -2% | -$485 |
|
824
Boston Beer
SAM
$1.88B
| $406K | 0.02% |
2,150
-1,540
| -42% | -$283K |
|
|
ATSG
825
DELISTED
Air Transport Services Group
ATSG
| $406K | 0.02% |
17,440
+5,442
| +45% | +$134K |
|
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.