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 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$49.8M |
| 2 |
Apple
AAPL
|
+$24.5M |
| 3 |
Citigroup
C
|
+$23.5M |
| 4 |
Amazon
AMZN
|
+$22.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$18.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
LNKD
LinkedIn Corporation
LNKD
|
+$17.4M |
| 2 |
Wells Fargo
WFC
|
+$13.5M |
| 3 |
MDVN
MEDIVATION, INC.
MDVN
|
+$8.62M |
| 4 |
Goldman Sachs
GS
|
+$8.5M |
| 5 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$8.15M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 8.76% |
| 2 | Technology | 7.19% |
| 3 | Healthcare | 6.91% |
| 4 | Consumer Discretionary | 6.53% |
| 5 | Financials | 5.37% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3176
PUT
FIVE9
FIVN
$1.96B
| $17K | ﹤0.01% |
+1,094
| New | +$15.8K |
|
3177
PUT
Fortinet
FTNT
$112B
| $17K | ﹤0.01% |
1,435
+1,225
| +583% | +$7.66K |
|
3178
Gogo Inc
GOGO
$540M
| $17K | ﹤0.01% |
1,892
-8,403
| -82% | -$83K |
|
|
MCHB
3179
CALL
Mechanics Bancorp
MCHB
$3.46B
| $17K | ﹤0.01% |
21
-213
| -91% | -$6.11K |
|
3180
PUT
Iron Mountain
IRM
$37.8B
| $17K | ﹤0.01% |
+79
| New | +$2.63K |
|
3181
PUT
Pediatrix Medical
MD
$2.15B
| $17K | ﹤0.01% |
178
+149
| +514% | +$9.69K |
|
|
MGIC
3182
PUT
DELISTED
Magic Software Enterprises
MGIC
| $17K | ﹤0.01% |
+155
| New | +$1.11K |
|
3183
CALL
Match Group
MTCH
$9.05B
| $17K | ﹤0.01% |
148
-4
| -3% | -$71 |
|
3184
CALL
Neurocrine Biosciences
NBIX
$17.7B
| $17K | ﹤0.01% |
68
-216
| -76% | -$9.78K |
|
3185
OneMain Financial
OMF
$7.08B
| $17K | ﹤0.01% |
773
+93
| +14% | +$2.29K |
|
3186
OraSure Technologies
OSUR
$273M
| $17K | ﹤0.01% |
1,994
-3,210
| -62% | -$26.5K |
|
3187
PUT
PBF Energy
PBF
$7.43B
| $17K | ﹤0.01% |
278
-138
| -33% | -$3.37K |
|
3188
PUT
PhenixFIN
PFX
$84.1M
| $17K | ﹤0.01% |
13
+10
| +333% | +$1.53K |
|
3189
PUT
PRA Group
PRAA
$683M
| $17K | ﹤0.01% |
71
+60
| +545% | +$2.04K |
|
|
P
3190
PUT
Everpure Inc
P
$24.7B
| $17K | ﹤0.01% |
1,928
+941
| +95% | +$12.2K |
|
3191
CALL
SolarEdge
SEDG
$2.62B
| $17K | ﹤0.01% |
172
+79
| +85% | +$1.1K |
|
3192
CALL
Super Micro Computer
SMCI
$19.3B
| $17K | ﹤0.01% |
750
+120
| +19% | +$302 |
|
3193
PUT
Suburban Propane Partners
SPH
$1.21B
| $17K | ﹤0.01% |
148
+128
| +640% | +$3.92K |
|
|
TGNA
3194
CALL
DELISTED
TEGNA Inc
TGNA
| $17K | ﹤0.01% |
+323
| New | +$4.4K |
|
3195
CALL
Thor Industries
THO
$3.98B
| $17K | ﹤0.01% |
15
-375
| -96% | -$33.8K |
|
3196
CALL
Toll Brothers
TOL
$14.1B
| $17K | ﹤0.01% |
94
-46
| -33% | -$1.36K |
|
3197
CALL
TherapeuticsMD
TXMD
$24M
| $17K | ﹤0.01% |
17
+8
| +89% | +$2.48K |
|
3198
CALL
Workday
WDAY
$36.4B
| $17K | ﹤0.01% |
602
+3
| +0.5% | +$242 |
|
|
WW
3199
CALL
DELISTED
WW International
WW
| $17K | ﹤0.01% |
186
-101
| -35% | -$1.09K |
|
3200
ProShares Ultra FTSE China 50 of PROSHARES TRUST
XPP
$9.13M
| $17K | ﹤0.01% |
376
-460
| -55% | -$23.4K |
|
Similar funds
Simplex Trading's Q4 2016 Portfolio in Review
As of Q4 2016, Simplex Trading held 7,301 positions worth $1.67B, up 13% from $1.48B the previous quarter. Its ten largest holdings account for 20% of the portfolio.
Simplex Trading deployed $181M of net new capital in Q4 2016, opening 1,543 new positions and adding to 2,137 existing holdings. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 227,870 shares worth $50.9M.
By sector, the portfolio is most concentrated in Communication Services at 8.8% of assets, up from 8.4% a quarter earlier, followed by Technology and Healthcare.
On the sell side, the largest reduction was Goldman Sachs, an estimated $8.5M trimmed.
- Simplex Trading's largest Q4 2016 buy was State Street SPDR S&P 500 ETF Trust: 227,870 shares worth $50.9M.
- Simplex Trading added most to Apple in Q4 2016, an estimated $24.5M increase.
- Simplex Trading's biggest Q4 2016 reduction was Goldman Sachs, cutting an estimated $8.5M.
- Simplex Trading fully exited LinkedIn Corporation in Q4 2016, selling an estimated $17.4M.
- Simplex Trading's ten largest holdings make up 20% of its $1.67B portfolio in Q4 2016.
- Simplex Trading opened 1,543 new positions and closed 1,480 in Q4 2016.
- Simplex Trading's portfolio value rose 13% quarter-over-quarter to $1.67B.
Based on Simplex Trading's 13F filing for Q4 2016, filed 11 Jan 2017.