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 | |
|---|---|---|---|---|---|---|
|
CEO
326
DELISTED
CNOOC Limited
CEO
| $1.21M | 0.05% |
8,394
-3,707
| -31% | -$502K |
|
327
CALL
Lowe's Companies
LOW
$115B
| $1.2M | 0.05% |
1,999
+145
| +8% | +$12K |
|
328
CALL
Wynn Resorts
WYNN
$9.79B
| $1.2M | 0.05% |
1,302
-341
| -21% | -$52.6K |
|
329
Dick's Sporting Goods
DKS
$18.8B
| $1.19M | 0.05% |
41,389
+21,492
| +108% | +$593K |
|
330
PUT
Snap
SNAP
$7.52B
| $1.19M | 0.05% |
8,648
+2,741
| +46% | +$40K |
|
331
CALL
eBay
EBAY
$49.3B
| $1.19M | 0.05% |
2,969
+188
| +7% | +$6.98K |
|
332
Energous
WATT
$84.8M
| $1.19M | 0.05% |
+102
| New | +$642K |
|
|
SFLY
333
DELISTED
Shutterfly, Inc.
SFLY
| $1.19M | 0.05% |
23,867
+7,751
| +48% | +$351K |
|
334
T-Mobile US
TMUS
$207B
| $1.19M | 0.05% |
18,682
-98,285
| -84% | -$6M |
|
335
CALL
Chipotle Mexican Grill
CMG
$41.3B
| $1.18M | 0.05% |
252,900
+35,550
| +16% | +$212K |
|
336
Cigna
CI
$75.4B
| $1.18M | 0.05% |
+5,795
| New | +$1.15M |
|
|
HA
337
DELISTED
Hawaiian Holdings, Inc.
HA
| $1.17M | 0.05% |
+29,408
| New | +$1.13M |
|
338
CALL
Avis
CAR
$5.81B
| $1.17M | 0.05% |
1,060
+316
| +42% | +$12.6K |
|
339
CALL
VanEck Gold Miners ETF
GDX
$23.4B
| $1.17M | 0.05% |
10,521
-668
| -6% | -$15.2K |
|
340
Invesco DB US Dollar Index Bullish Fund
UUP
$432M
| $1.17M | 0.05% |
48,527
-7,264
| -13% | -$177K |
|
341
CALL
Accenture
ACN
$85.7B
| $1.17M | 0.05% |
1,298
+208
| +19% | +$30.1K |
|
342
General Mills
GIS
$19.7B
| $1.16M | 0.05% |
+19,617
| New | +$1.06M |
|
343
Microchip Technology
MCHP
$46.2B
| $1.16M | 0.05% |
26,488
-4,910
| -16% | -$222K |
|
344
Mattel
MAT
$4.18B
| $1.16M | 0.05% |
75,599
+44,325
| +142% | +$702K |
|
|
PTLA
345
DELISTED
Portola Pharmaceuticals, Inc.
PTLA
| $1.15M | 0.05% |
23,671
+10,985
| +87% | +$556K |
|
|
TCO
346
DELISTED
Taubman Centers Inc.
TCO
| $1.15M | 0.05% |
17,581
+14,362
| +446% | +$789K |
|
347
Tucows
TCX
$105M
| $1.15M | 0.05% |
16,352
+9,831
| +151% | +$597K |
|
348
CALL
Intel
INTC
$516B
| $1.14M | 0.05% |
7,327
+3,197
| +77% | +$140K |
|
|
JOYY
349
JOYY Inc
JOYY
$3.65B
| $1.14M | 0.05% |
+10,089
| New | +$1.01M |
|
350
Eli Lilly
LLY
$1.04T
| $1.13M | 0.05% |
13,414
-21,432
| -62% | -$1.82M |
|
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.