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 | |
|---|---|---|---|---|---|---|
|
RFP
1226
CALL
DELISTED
Resolute Forest Products Inc.
RFP
| $214K | 0.01% |
1,003
+842
| +523% | +$6.82K |
|
|
HAWK
1227
DELISTED
Blackhawk Network Holdings, Inc. Common Stock
HAWK
| $214K | 0.01% |
+6,015
| New | +$217K |
|
1228
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $212K | 0.01% |
2,684
+455
| +20% | +$86.4K |
|
1229
iShares MSCI United Kingdom ETF
EWU
$4B
| $212K | 0.01% |
5,938
+4,959
| +507% | +$173K |
|
1230
CALL
Genuine Parts
GPC
$16.6B
| $212K | 0.01% |
552
+270
| +96% | +$24.7K |
|
|
CUB
1231
DELISTED
Cubic Corporation
CUB
| $212K | 0.01% |
+3,610
| New | +$203K |
|
1232
CALL
Core Laboratories
CLB
$544M
| $211K | 0.01% |
100
+83
| +488% | +$8.28K |
|
1233
Nelnet
NNI
$4.73B
| $211K | 0.01% |
3,860
+3,529
| +1,066% | +$191K |
|
1234
PUT
Whirlpool
WHR
$2.31B
| $211K | 0.01% |
802
+18
| +2% | +$3.05K |
|
1235
CALL
Yelp
YELP
$1.35B
| $211K | 0.01% |
467
+67
| +17% | +$2.98K |
|
1236
Meritage Homes
MTH
$4.77B
| $210K | 0.01% |
+8,226
| New | +$204K |
|
1237
Tapestry
TPR
$28.1B
| $210K | 0.01% |
4,760
-7,976
| -63% | -$329K |
|
|
TGH
1238
DELISTED
Textainer Group Holdings limited
TGH
| $210K | 0.01% |
9,812
+1,765
| +22% | +$36.4K |
|
|
FNSR
1239
PUT
DELISTED
Finisar Corp
FNSR
| $209K | 0.01% |
1,138
+585
| +106% | +$12.2K |
|
1240
CALL
Cheniere Energy
LNG
$57B
| $208K | 0.01% |
688
-63
| -8% | -$3.04K |
|
1241
PUT
RH
RH
$3.14B
| $208K | 0.01% |
1,290
+306
| +31% | +$27.7K |
|
|
DNKN
1242
CALL
DELISTED
Dunkin' Brands Group, Inc.
DNKN
| $208K | 0.01% |
404
+89
| +28% | +$5.19K |
|
1243
PUT
CSX Corp
CSX
$98.1B
| $207K | 0.01% |
9,264
+4,305
| +87% | +$76.2K |
|
1244
CALL
The Mosaic Company
MOS
$7.08B
| $207K | 0.01% |
781
+469
| +150% | +$10.8K |
|
1245
Murphy Oil
MUR
$5.65B
| $207K | 0.01% |
+6,676
| New | +$186K |
|
1246
Voyager Therapeutics
VYGR
$187M
| $207K | 0.01% |
12,516
+12,110
| +2,983% | +$208K |
|
1247
CALL
Allstate
ALL
$65.5B
| $206K | 0.01% |
258
+142
| +122% | +$14K |
|
|
AXDX
1248
DELISTED
Accelerate Diagnostics
AXDX
| $206K | 0.01% |
787
-586
| -43% | -$137K |
|
1249
PUT
AB InBev
BUD
$155B
| $206K | 0.01% |
1,081
+312
| +41% | +$36.7K |
|
1250
Chemed
CHE
$6.68B
| $206K | 0.01% |
+848
| New | +$193K |
|
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.