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 |
CELG
Celgene Corp
CELG
|
+$31.6M |
| 2 |
Citigroup
C
|
+$19.5M |
| 3 |
AGN
Allergan plc
AGN
|
+$18.4M |
| 4 |
Baidu
BIDU
|
+$18M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$14.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$81.3M |
| 2 |
NVIDIA
NVDA
|
+$60.2M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$48.2M |
| 4 |
Apple
AAPL
|
+$48.2M |
| 5 |
Meta Platforms (Facebook)
META
|
+$31.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 11.27% |
| 2 | Technology | 10.64% |
| 3 | Healthcare | 7.06% |
| 4 | Communication Services | 6.92% |
| 5 | Industrials | 5.66% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
926
Sabesp
SBS
$20.1B
| $340K | 0.01% |
168,015
+167,185
| +20,143% | +$321K |
|
|
NETI
927
DELISTED
Eneti Inc.
NETI
| $340K | 0.01% |
4,955
+1,146
| +30% | +$79.8K |
|
928
CALL
Sony
SONY
$121B
| $339K | 0.01% |
3,210
+1,445
| +82% | +$12.4K |
|
929
PUT
Cisco
CSCO
$444B
| $338K | 0.01% |
2,233
+1,335
| +149% | +$47.7K |
|
930
Teradata
TDC
$2.59B
| $337K | 0.01% |
8,783
-19,811
| -69% | -$708K |
|
931
CALL
Wayfair
W
$10.9B
| $336K | 0.01% |
370
-216
| -37% | -$15.2K |
|
932
PUT
Workday
WDAY
$31.6B
| $336K | 0.01% |
653
+349
| +115% | +$37.3K |
|
933
PUT
Nike
NKE
$60.8B
| $335K | 0.01% |
1,771
-2,759
| -61% | -$159K |
|
934
Puma Biotechnology
PBYI
$408M
| $335K | 0.01% |
+3,395
| New | +$380K |
|
935
Pultegroup
PHM
$23.7B
| $333K | 0.01% |
+10,016
| New | +$311K |
|
936
Advanced Drainage Systems
WMS
$10.8B
| $332K | 0.01% |
+13,928
| New | +$300K |
|
937
PUT
Bank of America
BAC
$430B
| $331K | 0.01% |
5,855
+3,516
| +150% | +$96.9K |
|
938
Enanta Pharmaceuticals
ENTA
$376M
| $331K | 0.01% |
+5,644
| New | +$283K |
|
939
Northrop Grumman
NOC
$75.2B
| $331K | 0.01% |
1,079
-474
| -31% | -$142K |
|
940
AXIS Capital
AXS
$8.43B
| $330K | 0.01% |
6,584
+5,305
| +415% | +$283K |
|
941
Edwards Lifesciences
EW
$48B
| $330K | 0.01% |
+8,790
| New | +$323K |
|
942
ATI
ATI
$27.1B
| $329K | 0.01% |
+13,666
| New | +$325K |
|
943
CALL
Lam Research
LRCX
$397B
| $329K | 0.01% |
5,900
+3,090
| +110% | +$60.7K |
|
|
RSX
944
DELISTED
VanEck Russia ETF
RSX
| $329K | 0.01% |
15,535
-20,197
| -57% | -$442K |
|
|
DERM
945
DELISTED
Dermira, Inc.
DERM
| $327K | 0.01% |
11,759
-7,746
| -40% | -$205K |
|
|
WRD
946
DELISTED
WildHorse Resource Development
WRD
| $327K | 0.01% |
17,801
-16,111
| -48% | -$242K |
|
947
ProShares UltraShort Euro
EUO
$35.6M
| $324K | 0.01% |
+15,312
| New | +$335K |
|
948
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $323K | 0.01% |
1,122
-905
| -45% | -$103K |
|
949
PUT
Alaunos Therapeutics
TCRT
$4.69M
| $323K | 0.01% |
7
+5
| +250% | +$3.59K |
|
950
Vanguard S&P 500 ETF
VOO
$966B
| $323K | 0.01% |
+1,318
| New | +$315K |
|
Similar funds
Simplex Trading's Q4 2017 Portfolio in Review
As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.
Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.
Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.
- Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
- Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
- Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
- Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
- Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
- Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.
Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.