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 | |
|---|---|---|---|---|---|---|
901
CALL
General Dynamics
GD
$103B
| $351K | 0.02% |
499
-32
| -6% | -$6.54K |
|
902
CALL
Mohawk Industries
MHK
$6.71B
| $351K | 0.02% |
185
-9
| -5% | -$2.42K |
|
903
Transocean
RIG
$5.88B
| $351K | 0.02% |
32,933
-19,845
| -38% | -$206K |
|
904
Westlake Corp
WLK
$9.64B
| $351K | 0.02% |
+3,297
| New | +$305K |
|
|
JOYY
905
CALL
JOYY Inc
JOYY
$3.65B
| $350K | 0.02% |
441
-4
| -0.9% | -$401 |
|
|
QHC
906
DELISTED
Quorum Health Corporation
QHC
| $350K | 0.02% |
56,243
+36,334
| +183% | +$182K |
|
907
PUT
Boston Scientific
BSX
$64.8B
| $349K | 0.02% |
1,472
+1,121
| +319% | +$30.9K |
|
|
TSRO
908
PUT
DELISTED
TESARO, Inc.
TSRO
| $348K | 0.02% |
169
-162
| -49% | -$15.9K |
|
909
Scholastic
SCHL
$855M
| $347K | 0.01% |
8,656
+7,756
| +862% | +$301K |
|
|
KL
910
DELISTED
Kirkland Lake Gold Ltd Ordinary
KL
| $346K | 0.01% |
22,588
+19,675
| +675% | +$271K |
|
911
Cognizant
CTSH
$20.3B
| $345K | 0.01% |
4,859
-18,212
| -79% | -$1.33M |
|
|
HOUS
912
DELISTED
Anywhere Real Estate
HOUS
| $345K | 0.01% |
13,039
+9,546
| +273% | +$277K |
|
|
AKS
913
DELISTED
AK Steel Holding Corp
AKS
| $345K | 0.01% |
+61,101
| New | +$319K |
|
914
Valvoline
VVV
$4.88B
| $344K | 0.01% |
13,744
+12,870
| +1,473% | +$311K |
|
915
CALL
Diamondback Energy
FANG
$57.9B
| $343K | 0.01% |
361
+127
| +54% | +$13.8K |
|
|
JWN
916
CALL
DELISTED
Nordstrom
JWN
| $343K | 0.01% |
1,081
+467
| +76% | +$20.1K |
|
917
Range Resources
RRC
$9.09B
| $343K | 0.01% |
20,140
-9,669
| -32% | -$174K |
|
918
PUT
Dick's Sporting Goods
DKS
$18.3B
| $342K | 0.01% |
1,487
+830
| +126% | +$22.9K |
|
919
Ares Capital
ARCC
$13.4B
| $341K | 0.01% |
21,713
-5,194
| -19% | -$84.3K |
|
|
VNET
920
VNET Group
VNET
$2.21B
| $341K | 0.01% |
42,754
+25,450
| +147% | +$185K |
|
|
EPAY
921
DELISTED
Bottomline Technologies Inc
EPAY
| $341K | 0.01% |
+9,851
| New | +$330K |
|
922
PUT
Caterpillar
CAT
$411B
| $340K | 0.01% |
4,561
-1,121
| -20% | -$155K |
|
|
FITB
923
CALL
Fifth Third Bancorp
FITB
$51.7B
| $340K | 0.01% |
1,037
+46
| +5% | +$1.34K |
|
924
Children's Place
PLCE
$58.5M
| $340K | 0.01% |
2,342
-11,509
| -83% | -$1.4M |
|
925
LiveRamp
RAMP
$2.29B
| $340K | 0.01% |
12,352
-2,509
| -17% | -$65.9K |
|
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.