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 | |
|---|---|---|---|---|---|---|
|
FOLD
2676
CALL
DELISTED
Amicus Therapeutics
FOLD
| $39K | ﹤0.01% |
378
+31
| +9% | +$426 |
|
|
KNDI
2677
CALL
Kandi Technologies Group
KNDI
$65.3M
| $39K | ﹤0.01% |
375
+335
| +838% | +$2.5K |
|
2678
NMI Holdings
NMIH
$3.25B
| $39K | ﹤0.01% |
+2,336
| New | +$36.5K |
|
2679
CALL
OraSure Technologies
OSUR
$273M
| $39K | ﹤0.01% |
152
+82
| +117% | +$1.49K |
|
2680
Oxford Industries
OXM
$577M
| $39K | ﹤0.01% |
+525
| New | +$35.1K |
|
2681
Primerica
PRI
$9.81B
| $39K | ﹤0.01% |
+391
| New | +$37.3K |
|
2682
Pricesmart
PSMT
$5.75B
| $39K | ﹤0.01% |
462
+268
| +138% | +$22.9K |
|
2683
CALL
Tanger
SKT
$4.82B
| $39K | ﹤0.01% |
164
-226
| -58% | -$5.59K |
|
|
STKL
2684
DELISTED
SunOpta
STKL
| $39K | ﹤0.01% |
+5,116
| New | +$42.7K |
|
2685
PUT
NCR Voyix
VYX
$1.06B
| $39K | ﹤0.01% |
171
+140
| +452% | +$2.84K |
|
|
NTUS
2686
CALL
DELISTED
Natus Medical Inc
NTUS
| $39K | ﹤0.01% |
85
-32
| -27% | -$1.28K |
|
|
BREW
2687
CALL
DELISTED
Craft Brew Alliance, Inc.
BREW
| $39K | ﹤0.01% |
571
+74
| +15% | +$1.39K |
|
2688
CALL
Aflac
AFL
$63.9B
| $38K | ﹤0.01% |
248
-196
| -44% | -$8.37K |
|
2689
PUT
Ambarella
AMBA
$2.99B
| $38K | ﹤0.01% |
317
-143
| -31% | -$7.95K |
|
2690
CALL
Constellium
CSTM
$3.96B
| $38K | ﹤0.01% |
490
+246
| +101% | +$2.62K |
|
2691
PUT
Dycom Industries
DY
$12.9B
| $38K | ﹤0.01% |
109
+61
| +127% | +$5.89K |
|
|
JNPR
2692
PUT
DELISTED
Juniper Networks
JNPR
| $38K | ﹤0.01% |
860
+597
| +227% | +$16.1K |
|
2693
PUT
Lamar Advertising Co
LAMR
$16.2B
| $38K | ﹤0.01% |
772
+165
| +27% | +$12K |
|
2694
CALL
Dorian LPG
LPG
$1.94B
| $38K | ﹤0.01% |
270
+60
| +29% | +$461 |
|
|
NAK
2695
PUT
Northern Dynasty Minerals
NAK
$885M
| $38K | ﹤0.01% |
336
+218
| +185% | +$431 |
|
2696
CALL
Intellia Therapeutics
NTLA
$1.5B
| $38K | ﹤0.01% |
274
+135
| +97% | +$3.12K |
|
2697
PUT
OFG Bancorp
OFG
$2.21B
| $38K | ﹤0.01% |
1,171
-76
| -6% | -$682 |
|
2698
CALL
Pool Corp
POOL
$6.7B
| $38K | ﹤0.01% |
16
-30
| -65% | -$3.65K |
|
|
P
2699
PUT
Everpure Inc
P
$24.8B
| $38K | ﹤0.01% |
2,344
+2,242
| +2,198% | +$37.4K |
|
|
TMQ
2700
PUT
Trilogy Metals
TMQ
$522M
| $38K | ﹤0.01% |
+100
| New | +$96 |
|
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.