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 | |
|---|---|---|---|---|---|---|
351
Cheniere Energy
LNG
$56B
| $1.13M | 0.05% |
+21,036
| New | +$1.01M |
|
|
COL
352
DELISTED
Rockwell Collins
COL
| $1.13M | 0.05% |
8,344
-32,818
| -80% | -$4.4M |
|
353
Century Aluminum
CENX
$4.49B
| $1.13M | 0.05% |
+57,401
| New | +$879K |
|
354
WIX.com
WIX
$2.04B
| $1.13M | 0.05% |
19,566
+11,547
| +144% | +$715K |
|
|
AET
355
CALL
DELISTED
Aetna Inc
AET
| $1.12M | 0.05% |
1,179
+575
| +95% | +$98.8K |
|
|
SHNY
356
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $1.12M | 0.05% |
6,080
+799
| +15% | +$7.4K |
|
357
iShares MSCI BIC ETF
BKF
$75.7M
| $1.12M | 0.05% |
25,155
+24,206
| +2,551% | +$1.07M |
|
358
State Street SPDR S&P Regional Banking ETF
KRE
$4.85B
| $1.12M | 0.05% |
+18,991
| New | +$1.09M |
|
359
Ciena
CIEN
$56.2B
| $1.11M | 0.05% |
53,143
+48,944
| +1,166% | +$1.04M |
|
360
T. Rowe Price
TROW
$24.9B
| $1.11M | 0.05% |
10,575
-5,318
| -33% | -$519K |
|
361
Ferrari
RACE
$65.4B
| $1.11M | 0.05% |
10,567
+5,309
| +101% | +$590K |
|
362
PUT
ProShares UltraShort Health Care
RXD
$3.38M
| $1.11M | 0.05% |
272
-91
| -25% | -$11.2K |
|
|
AABA
363
CALL
DELISTED
Altaba Inc
AABA
| $1.1M | 0.05% |
2,631
-4,412
| -63% | -$307K |
|
364
PUT
AutoZone
AZO
$48.5B
| $1.1M | 0.05% |
638
+261
| +69% | +$167K |
|
365
YPF
YPF
$20.6B
| $1.1M | 0.05% |
47,927
+3,379
| +8% | +$77.5K |
|
366
Vanguard FTSE Europe ETF
VGK
$30.2B
| $1.1M | 0.05% |
18,551
+9,180
| +98% | +$536K |
|
|
KANG
367
DELISTED
iKang Healthcare Group, Inc.
KANG
| $1.09M | 0.05% |
68,884
-27,035
| -28% | -$391K |
|
368
CALL
Teva Pharmaceuticals
TEVA
$35.1B
| $1.08M | 0.05% |
5,310
+102
| +2% | +$1.53K |
|
369
PUT
Bausch Health
BHC
$1.7B
| $1.08M | 0.05% |
4,602
-795
| -15% | -$12.6K |
|
|
CELG
370
CALL
DELISTED
Celgene Corp
CELG
| $1.07M | 0.05% |
4,198
+424
| +11% | +$47.8K |
|
371
CALL
American Express
AXP
$238B
| $1.07M | 0.05% |
1,194
-547
| -31% | -$52.1K |
|
372
EOG Resources
EOG
$76.7B
| $1.07M | 0.05% |
+9,916
| New | +$999K |
|
|
ICPT
373
PUT
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $1.07M | 0.05% |
278
-185
| -40% | -$11.7K |
|
|
PNK
374
DELISTED
Pinnacle Entertainment Inc.
PNK
| $1.07M | 0.05% |
32,614
-992
| -3% | -$27.6K |
|
375
PUT
Visa
V
$672B
| $1.06M | 0.05% |
6,068
+1,088
| +22% | +$120K |
|
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.