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 | |
|---|---|---|---|---|---|---|
|
AET
1201
PUT
DELISTED
Aetna Inc
AET
| $223K | 0.01% |
1,224
+357
| +41% | +$61.3K |
|
|
LNCE
1202
CALL
DELISTED
Snyders-Lance, Inc.
LNCE
| $223K | 0.01% |
+294
| New | +$11.7K |
|
|
MNDT
1203
PUT
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $222K | 0.01% |
2,644
+653
| +33% | +$9.94K |
|
1204
CALL
CVR Energy
CVI
$3.41B
| $221K | 0.01% |
298
-152
| -34% | -$4.73K |
|
1205
Invesco DB Agriculture Fund
DBA
$1.26B
| $221K | 0.01% |
11,807
-13,985
| -54% | -$265K |
|
1206
CALL
Darden Restaurants
DRI
$22.2B
| $221K | 0.01% |
318
+73
| +30% | +$6.17K |
|
1207
PENN Entertainment
PENN
$2.71B
| $221K | 0.01% |
+7,083
| New | +$191K |
|
1208
Coherus Oncology
CHRS
$221M
| $219K | 0.01% |
24,973
+14,821
| +146% | +$159K |
|
1209
PUT
New Oriental
EDU
$7.85B
| $219K | 0.01% |
362
-113
| -24% | -$10K |
|
1210
Impinj
PI
$3.86B
| $219K | 0.01% |
9,754
+855
| +10% | +$24.5K |
|
1211
CALL
Zoetis
ZTS
$31.3B
| $218K | 0.01% |
332
+13
| +4% | +$893 |
|
|
VIAB
1212
CALL
DELISTED
Viacom Inc. Class B
VIAB
| $218K | 0.01% |
1,053
+112
| +12% | +$3.04K |
|
1213
Cenovus Energy
CVE
$55.4B
| $217K | 0.01% |
23,858
-22,174
| -48% | -$215K |
|
1214
PUT
GameStop
GME
$9.58B
| $217K | 0.01% |
4,844
+2,812
| +138% | +$13.1K |
|
1215
CALL
iShares Morningstar Value ETF
ILCV
$1.29B
| $217K | 0.01% |
6,838
+1,930
| +39% | +$99K |
|
|
TTPH
1216
DELISTED
Tetraphase Pharmaceuticals, Inc.
TTPH
| $217K | 0.01% |
+1,730
| New | +$222K |
|
|
ETP
1217
PUT
DELISTED
Energy Transfer Partners, L.P.
ETP
| $216K | 0.01% |
999
-109
| -10% | -$1.88K |
|
1218
CALL
Agnico Eagle Mines
AEM
$72.3B
| $215K | 0.01% |
1,171
+498
| +74% | +$22.2K |
|
1219
PUT
Equifax
EFX
$19.6B
| $215K | 0.01% |
1,126
+320
| +40% | +$36K |
|
|
FL
1220
PUT
DELISTED
Foot Locker
FL
| $215K | 0.01% |
1,446
+570
| +65% | +$21.3K |
|
1221
PUT
Humana
HUM
$47.4B
| $215K | 0.01% |
975
+389
| +66% | +$96.1K |
|
1222
PUT
Veeva Systems
VEEV
$29.2B
| $215K | 0.01% |
322
+171
| +113% | +$10.1K |
|
|
AMRN
1223
Amarin Corp
AMRN
$285M
| $214K | 0.01% |
2,671
+1,302
| +95% | +$89.7K |
|
|
DFS
1224
CALL
DELISTED
Discover Financial Services
DFS
| $214K | 0.01% |
360
+109
| +43% | +$7.5K |
|
1225
Lesaka Technologies
LSAK
$408M
| $214K | 0.01% |
+18,082
| New | +$183K |
|
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.