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 | |
|---|---|---|---|---|---|---|
3851
PUT
Broadridge
BR
$18.4B
| $12K | ﹤0.01% |
25
+3
| +14% | +$298 |
|
3852
CALL
Peabody Energy
BTU
$2.54B
| $12K | ﹤0.01% |
515
+219
| +74% | +$8.71K |
|
3853
Babcock & Wilcox
BW
$1.18B
| $12K | ﹤0.01% |
277
-728
| -72% | -$42.3K |
|
|
CDTX
3854
DELISTED
Cidara Therapeutics
CDTX
| $12K | ﹤0.01% |
+161
| New | +$22K |
|
|
CLLS
3855
Cellectis
CLLS
$288M
| $12K | ﹤0.01% |
+406
| New | +$12.8K |
|
3856
Cohen & Steers
CNS
$4.2B
| $12K | ﹤0.01% |
316
-487
| -61% | -$20.5K |
|
3857
CALL
Campbell Soup
CPB
$6.85B
| $12K | ﹤0.01% |
179
-192
| -52% | -$8.65K |
|
3858
PUT
Diageo
DEO
$49.6B
| $12K | ﹤0.01% |
46
-20
| -30% | -$2.78K |
|
3859
PUT
VanEck Energy Income ETF
EINC
$77.6M
| $12K | ﹤0.01% |
+1
| New | +$70 |
|
3860
CALL
Equinor
EQNR
$97.3B
| $12K | ﹤0.01% |
36
-16
| -31% | -$367 |
|
|
FARO
3861
PUT
DELISTED
Faro Technologies
FARO
| $12K | ﹤0.01% |
51
-1
| -2% | -$55 |
|
3862
PUT
Fastenal
FAST
$54.8B
| $12K | ﹤0.01% |
1,652
+876
| +113% | +$12.1K |
|
3863
CALL
Franklin Covey
FC
$239M
| $12K | ﹤0.01% |
38
-355
| -90% | -$9.68K |
|
3864
FMC
FMC
$1.25B
| $12K | ﹤0.01% |
+182
| New | +$13.6K |
|
3865
CALL
Franco-Nevada
FNV
$41.3B
| $12K | ﹤0.01% |
107
-149
| -58% | -$10.9K |
|
|
GRFS
3866
Grifois
GRFS
$5.55B
| $12K | ﹤0.01% |
+594
| New | +$13.5K |
|
3867
CALL
Groupon
GRPN
$1.03B
| $12K | ﹤0.01% |
17
+8
| +89% | +$776 |
|
3868
CALL
Henry Schein
HSIC
$9.78B
| $12K | ﹤0.01% |
55
-14
| -20% | -$776 |
|
3869
PUT
Immunic
IMUX
$178M
| – | – |
0
| – | – |
|
3870
PUT
Innodata
INOD
$1.81B
| $12K | ﹤0.01% |
30
| – | – |
|
3871
CALL
Logitech
LOGI
$14.8B
| $12K | ﹤0.01% |
93
-30
| -24% | -$1.16K |
|
3872
CALL
Grand Canyon Education
LOPE
$4.22B
| $12K | ﹤0.01% |
8
-4
| -33% | -$386 |
|
|
NVO
3873
CALL
Novo Nordisk
NVO
$228B
| $12K | ﹤0.01% |
164
-372
| -69% | -$9.77K |
|
|
OBE
3874
PUT
Obsidian Energy
OBE
$656M
| $12K | ﹤0.01% |
91
+79
| +658% | +$577 |
|
3875
Onto Innovation
ONTO
$10.9B
| $12K | ﹤0.01% |
464
+409
| +744% | +$10.9K |
|
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.