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 | |
|---|---|---|---|---|---|---|
3301
CALL
LPL Financial
LPLA
$27.3B
| $20K | ﹤0.01% |
75
-166
| -69% | -$8.73K |
|
3302
PUT
Middleby
MIDD
$6.2B
| $20K | ﹤0.01% |
31
+17
| +121% | +$2.08K |
|
3303
PUT
MGIC Investment
MTG
$6.44B
| $20K | ﹤0.01% |
146
+7
| +5% | +$98 |
|
3304
Matrix Service
MTRX
$332M
| $20K | ﹤0.01% |
+1,171
| New | +$18.4K |
|
3305
Natural Resource Partners
NRP
$1.33B
| $20K | ﹤0.01% |
801
-1,793
| -69% | -$45.6K |
|
3306
Oaktree Specialty Lending
OCSL
$1.05B
| $20K | ﹤0.01% |
+1,384
| New | +$22.2K |
|
3307
PUT
PetMed Express
PETS
$42.7M
| $20K | ﹤0.01% |
129
+1
| +0.8% | +$39 |
|
|
RDUS
3308
CALL
DELISTED
Radius Recycling
RDUS
| $20K | ﹤0.01% |
47
-18
| -28% | -$526 |
|
3309
RLI Corp
RLI
$6.04B
| $20K | ﹤0.01% |
+684
| New | +$20.1K |
|
3310
PUT
Safe Bulkers
SB
$761M
| $20K | ﹤0.01% |
157
+90
| +134% | +$289 |
|
|
SNBR
3311
PUT
DELISTED
Sleep Number
SNBR
| $20K | ﹤0.01% |
178
+87
| +96% | +$2.96K |
|
|
SNCR
3312
DELISTED
Synchronoss Technologies
SNCR
| $20K | ﹤0.01% |
+255
| New | +$24.6K |
|
|
SOL
3313
DELISTED
Emeren Group
SOL
| $20K | ﹤0.01% |
7,605
+7,573
| +23,666% | +$21.5K |
|
3314
SiriusPoint
SPNT
$3.1B
| $20K | ﹤0.01% |
1,424
+979
| +220% | +$15.8K |
|
3315
PUT
Steel Dynamics
STLD
$37.4B
| $20K | ﹤0.01% |
236
-58
| -20% | -$2.23K |
|
3316
CALL
Terex
TEX
$7.87B
| $20K | ﹤0.01% |
51
-168
| -77% | -$7.74K |
|
3317
iShares MSCI Thailand ETF
THD
$364M
| $20K | ﹤0.01% |
219
+218
| +21,800% | +$19.4K |
|
3318
CALL
Trade Desk
TTD
$8.85B
| $20K | ﹤0.01% |
2,730
+2,490
| +1,038% | +$13.7K |
|
3319
CALL
Upbound Group
UPBD
$1.23B
| $20K | ﹤0.01% |
429
+396
| +1,200% | +$4.33K |
|
|
ONIT
3320
CALL
Onity Group
ONIT
$344M
| $20K | ﹤0.01% |
156
-24
| -13% | -$1.2K |
|
|
BIG
3321
CALL
DELISTED
Big Lots, Inc.
BIG
| $20K | ﹤0.01% |
38
-76
| -67% | -$4.12K |
|
|
ATRS
3322
DELISTED
Antares Pharma, Inc.
ATRS
| $20K | ﹤0.01% |
10,130
-48,165
| -83% | -$105K |
|
|
TIF
3323
PUT
DELISTED
Tiffany & Co.
TIF
| $20K | ﹤0.01% |
935
+83
| +10% | +$7.91K |
|
|
LN
3324
CALL
DELISTED
LINE Corporation
LN
| $20K | ﹤0.01% |
153
+134
| +705% | +$5.49K |
|
|
DNR
3325
PUT
DELISTED
Denbury Resources, Inc.
DNR
| $20K | ﹤0.01% |
327
+98
| +43% | +$154 |
|
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.