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 |
iShares Russell 2000 ETF
IWM
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 6.46% |
| 2 | Communication Services | 4.66% |
| 3 | Consumer Discretionary | 4.6% |
| 4 | Technology | 4.57% |
| 5 | Financials | 4.49% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3326
PUT
Dana Inc
DAN
$2.93B
| $11K | ﹤0.01% |
+32
| New | +$578 |
|
3327
DXP Enterprises
DXPE
$2.57B
| $11K | ﹤0.01% |
+438
| New | +$14.7K |
|
3328
PUT
EPR Properties
EPR
$4.85B
| $11K | ﹤0.01% |
35
+28
| +400% | +$1.52K |
|
3329
Equinor
EQNR
$91.4B
| $11K | ﹤0.01% |
783
-400
| -34% | -$6.31K |
|
3330
PUT
Eagle Materials
EXP
$6.69B
| $11K | ﹤0.01% |
18
+15
| +500% | +$1.17K |
|
3331
CALL
Fluor
FLR
$7.22B
| $11K | ﹤0.01% |
131
-61
| -32% | -$2.86K |
|
3332
CALL
Flotek Industries
FTK
$881M
| $11K | ﹤0.01% |
17
+3
| +21% | +$304 |
|
|
HBI
3333
CALL
DELISTED
Hanesbrands
HBI
| $11K | ﹤0.01% |
316
+268
| +558% | +$8.31K |
|
|
HIMX
3334
CALL
Himax Technologies
HIMX
$2.22B
| $11K | ﹤0.01% |
102
+31
| +44% | +$230 |
|
3335
PUT
Intrepid Potash
IPI
$461M
| $11K | ﹤0.01% |
+8
| New | +$665 |
|
3336
Itaú Unibanco
ITUB
$92.3B
| $11K | ﹤0.01% |
+3,889
| New | +$13.8K |
|
|
TBHC
3337
PUT
DELISTED
The Brand House Collective
TBHC
| $11K | ﹤0.01% |
60
+40
| +200% | +$1K |
|
|
HAPN
3338
CALL
Happen Inc
HAPN
$2.16B
| $11K | ﹤0.01% |
84
+52
| +163% | +$3.53K |
|
3339
CALL
L3Harris
LHX
$56.5B
| $11K | ﹤0.01% |
180
+77
| +75% | +$6.02K |
|
3340
CALL
Lumen
LUMN
$6.45B
| $11K | ﹤0.01% |
363
+43
| +13% | +$1.19K |
|
3341
Matsons
MATX
$6.22B
| $11K | ﹤0.01% |
+289
| New | +$11.4K |
|
3342
PUT
Middleby
MIDD
$6.15B
| $11K | ﹤0.01% |
21
+5
| +31% | +$576 |
|
3343
PUT
Strategy Inc
MSTR
$36B
| $11K | ﹤0.01% |
+10
| New | +$198 |
|
3344
PUT
Neogen
NEOG
$2.03B
| $11K | ﹤0.01% |
+77
| New | +$1.51K |
|
3345
Natural Health Trends
NHTC
$16.3M
| $11K | ﹤0.01% |
+352
| New | +$10.7K |
|
3346
News Corp Class A
NWSA
$14.8B
| $11K | ﹤0.01% |
945
+144
| +18% | +$2K |
|
3347
PUT
Paycom
PAYC
$7.05B
| $11K | ﹤0.01% |
98
+42
| +75% | +$1.52K |
|
3348
CALL
Pacira BioSciences
PCRX
$1.04B
| $11K | ﹤0.01% |
274
+248
| +954% | +$15.2K |
|
3349
CALL
Range Resources
RRC
$8.85B
| $11K | ﹤0.01% |
252
+111
| +79% | +$4.33K |
|
3350
PUT
Reliance Steel & Aluminium
RS
$20.6B
| $11K | ﹤0.01% |
+60
| New | +$3.51K |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.
By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.