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 |
Alphabet (Google) Class C
GOOG
|
+$54.6M |
| 2 |
Apple
AAPL
|
+$29.1M |
| 3 |
Meta Platforms (Facebook)
META
|
+$15.7M |
| 4 |
IBM
IBM
|
+$13.8M |
| 5 |
Baidu
BIDU
|
+$10.6M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$10.1M |
| 2 |
McDonald's
MCD
|
+$8.46M |
| 3 |
Ralph Lauren
RL
|
+$5.36M |
| 4 |
Intel
INTC
|
+$5.04M |
| 5 |
WBA
Walgreens Boots Alliance
WBA
|
+$4.76M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 14.27% |
| 2 | Technology | 10.3% |
| 3 | Healthcare | 7.76% |
| 4 | Consumer Discretionary | 6.32% |
| 5 | Financials | 5.18% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
OPLN
4051
Openlane
OPLN
$4.27B
| $3K | ﹤0.01% |
+214
| New | +$3.06K |
|
4052
CALL
KBR
KBR
$4.74B
| $3K | ﹤0.01% |
+15
| New | +$269 |
|
4053
CALL
CarMax
KMX
$8.36B
| $3K | ﹤0.01% |
26
-79
| -75% | -$5.63K |
|
4054
PUT
Standard BioTools
LAB
$311M
| $3K | ﹤0.01% |
+9
| New | +$284 |
|
4055
CALL
Leidos
LDOS
$14.9B
| $3K | ﹤0.01% |
10
| – | – |
|
4056
Lindsay Corp
LNN
$1.17B
| $3K | ﹤0.01% |
+38
| New | +$3.02K |
|
4057
LSB Industries
LXU
$822M
| $3K | ﹤0.01% |
+107
| New | +$3.5K |
|
4058
PUT
Microchip Technology
MCHP
$41.1B
| $3K | ﹤0.01% |
158
+112
| +243% | +$2.72K |
|
4059
CALL
Mercury Insurance
MCY
$6.07B
| $3K | ﹤0.01% |
+10
| New | +$563 |
|
4060
Pediatrix Medical
MD
$2.21B
| $3K | ﹤0.01% |
+45
| New | +$3.24K |
|
|
MITT
4061
TPG Mortgage Investment Trust
MITT
$230M
| $3K | ﹤0.01% |
72
+26
| +57% | +$1.47K |
|
4062
CALL
MKS Inc
MKSI
$19.3B
| $3K | ﹤0.01% |
+30
| New | +$1.09K |
|
4063
PUT
Marvell Technology
MRVL
$157B
| $3K | ﹤0.01% |
51
+12
| +31% | +$172 |
|
4064
PUT
M&T Bank
MTB
$36.6B
| $3K | ﹤0.01% |
5
-20
| -80% | -$2.46K |
|
4065
Navient
NAVI
$822M
| $3K | ﹤0.01% |
188
-449
| -70% | -$8.79K |
|
|
4066
PUT
Navient
NAVI
$822M
| $3K | ﹤0.01% |
20
-3
| -13% | -$59 |
|
4067
CALL
NeoGenomics
NEO
$1.74B
| $3K | ﹤0.01% |
+13
| New | +$67 |
|
4068
CALL
Navios Maritime Partners
NMM
$2.25B
| $3K | ﹤0.01% |
2
-1
| -33% | -$174 |
|
4069
PUT
NNN REIT
NNN
$9.37B
| $3K | ﹤0.01% |
66
+57
| +633% | +$2.19K |
|
4070
PUT
Northern Oil and Gas
NOG
$2.16B
| $3K | ﹤0.01% |
11
+10
| +1,000% | +$764 |
|
4071
CALL
Navigator Holdings
NVGS
$1.34B
| $3K | ﹤0.01% |
18
+9
| +100% | +$183 |
|
4072
PUT
Paycom
PAYC
$7.54B
| $3K | ﹤0.01% |
+56
| New | +$1.94K |
|
4073
PUT
PBF Energy
PBF
$7.22B
| $3K | ﹤0.01% |
+21
| New | +$590 |
|
4074
CALL
PG&E
PCG
$39.2B
| $3K | ﹤0.01% |
26
-191
| -88% | -$9.93K |
|
4075
Pegasystems
PEGA
$4.85B
| $3K | ﹤0.01% |
278
-4,536
| -94% | -$50.1K |
|
Similar funds
Simplex Trading's Q2 2015 Portfolio in Review
As of Q2 2015, Simplex Trading held 6,639 positions worth $1.19B, up 39% from $860M the previous quarter. Its ten largest holdings account for 20% of the portfolio.
Simplex Trading deployed $279M of net new capital in Q2 2015, opening 1,607 new positions and adding to 1,829 existing holdings. Its largest new stake was IBM: 85,948 shares worth $13.4M.
By sector, the portfolio is most concentrated in Communication Services at 14% of assets, up from 7.8% a quarter earlier, followed by Technology and Healthcare.
On the sell side, the largest reduction was Intel, an estimated $5.04M trimmed.
- Simplex Trading's largest Q2 2015 buy was IBM: 85,948 shares worth $13.4M.
- Simplex Trading added most to Alphabet (Google) Class C in Q2 2015, an estimated $54.6M increase.
- Simplex Trading's biggest Q2 2015 reduction was Intel, cutting an estimated $5.04M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q2 2015, selling an estimated $10.1M.
- Simplex Trading's ten largest holdings make up 20% of its $1.19B portfolio in Q2 2015.
- Simplex Trading opened 1,607 new positions and closed 1,438 in Q2 2015.
- Simplex Trading's portfolio value rose 39% quarter-over-quarter to $1.19B.
Based on Simplex Trading's 13F filing for Q2 2015, filed 8 Jul 2015.