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 | |
|---|---|---|---|---|---|---|
1301
VanEck Retail ETF
RTH
$246M
| $193K | 0.01% |
+2,115
| New | +$181K |
|
|
ENDP
1302
DELISTED
Endo International plc
ENDP
| $193K | 0.01% |
24,981
-23,337
| -48% | -$175K |
|
|
CALL
1303
DELISTED
magicJack VocalTec Ltd
CALL
| $193K | 0.01% |
22,854
+17,865
| +358% | +$135K |
|
|
BWLD
1304
PUT
DELISTED
Buffalo Wild Wings, Inc.
BWLD
| $193K | 0.01% |
918
+708
| +337% | +$93.2K |
|
|
KSU
1305
CALL
DELISTED
Kansas City Southern
KSU
| $192K | 0.01% |
298
-112
| -27% | -$11.9K |
|
|
WUBA
1306
PUT
DELISTED
58.com Inc
WUBA
| $192K | 0.01% |
731
+265
| +57% | +$18.4K |
|
|
SCG
1307
PUT
DELISTED
Scana
SCG
| $192K | 0.01% |
1,136
+689
| +154% | +$30.8K |
|
1308
Comtech Telecommunications
CMTL
$52.7M
| $191K | 0.01% |
8,642
+7,916
| +1,090% | +$169K |
|
1309
PUT
DuPont de Nemours
DD
$18.6B
| $191K | 0.01% |
1,304
+481
| +58% | +$86.6K |
|
1310
PUT
Domino's
DPZ
$10.7B
| $191K | 0.01% |
261
+48
| +23% | +$8.89K |
|
|
SAGE
1311
DELISTED
Sage Therapeutics
SAGE
| $191K | 0.01% |
1,161
-20,777
| -95% | -$2.01M |
|
1312
PUT
Target
TGT
$61.1B
| $191K | 0.01% |
3,062
+1,374
| +81% | +$83K |
|
|
DCM
1313
DELISTED
NTT DOCOMO, Inc.
DCM
| $191K | 0.01% |
8,054
+5,821
| +261% | +$142K |
|
1314
CALL
BP
BP
$113B
| $189K | 0.01% |
571
-340
| -37% | -$12.3K |
|
1315
PUT
Occidental Petroleum
OXY
$57.3B
| $189K | 0.01% |
1,017
+47
| +5% | +$3.19K |
|
1316
CALL
Royal Caribbean
RCL
$76B
| $189K | 0.01% |
408
-191
| -32% | -$23.6K |
|
1317
PUT
Prothena Corp
PRTA
$447M
| $188K | 0.01% |
137
-262
| -66% | -$13.3K |
|
|
SRCL
1318
DELISTED
Stericycle Inc
SRCL
| $188K | 0.01% |
2,766
-3,838
| -58% | -$261K |
|
|
TIF
1319
CALL
DELISTED
Tiffany & Co.
TIF
| $188K | 0.01% |
322
+7
| +2% | +$667 |
|
|
RDFN
1320
CALL
DELISTED
Redfin
RDFN
| $187K | 0.01% |
263
+125
| +91% | +$3.04K |
|
1321
CALL
Tractor Supply
TSCO
$15.9B
| $187K | 0.01% |
955
-375
| -28% | -$4.82K |
|
1322
PUT
Viatris
VTRS
$20.1B
| $187K | 0.01% |
1,988
+24
| +1% | +$917 |
|
|
TWNK
1323
DELISTED
Hostess Brands, Inc. Class A Common Stock
TWNK
| $187K | 0.01% |
+12,632
| New | +$166K |
|
1324
CALL
Pfizer
PFE
$143B
| $186K | 0.01% |
1,437
-2,341
| -62% | -$79.8K |
|
1325
PUT
Transocean
RIG
$5.89B
| $186K | 0.01% |
2,390
-525
| -18% | -$5.45K |
|
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.