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 | |
|---|---|---|---|---|---|---|
4151
CALL
Goodyear
GT
$2.04B
| $4K | ﹤0.01% |
79
+11
| +16% | +$330 |
|
4152
Halozyme
HALO
$9.66B
| $4K | ﹤0.01% |
309
-13,624
| -98% | -$274K |
|
4153
CALL
HDFC Bank
HDB
$119B
| $4K | ﹤0.01% |
188
-224
| -54% | -$3.38K |
|
|
HSII
4154
PUT
DELISTED
Heidrick & Struggles
HSII
| $4K | ﹤0.01% |
+28
| New | +$604 |
|
4155
PUT
Heartland Express
HTLD
$1.06B
| $4K | ﹤0.01% |
88
+68
| +340% | +$1.39K |
|
4156
CALL
Huntsman Corp
HUN
$2.06B
| $4K | ﹤0.01% |
461
+329
| +249% | +$5.66K |
|
4157
PUT
IAMGOLD
IAG
$8.5B
| $4K | ﹤0.01% |
35
+23
| +192% | +$37 |
|
|
IFN
4158
PUT
Aberdeen India Fund
IFN
$490M
| $4K | ﹤0.01% |
23
-11
| -32% | -$285 |
|
4159
PUT
Immersion
IMMR
$256M
| $4K | ﹤0.01% |
21
-9
| -30% | -$109 |
|
4160
Innoviva
INVA
$1.57B
| $4K | ﹤0.01% |
637
-106
| -14% | -$1.44K |
|
|
IRBT
4161
CALL
DELISTED
iRobot
IRBT
| $4K | ﹤0.01% |
42
+24
| +133% | +$730 |
|
4162
PUT
Iron Mountain
IRM
$37.8B
| $4K | ﹤0.01% |
29
-21
| -42% | -$627 |
|
4163
iShares US Energy ETF
IYE
$1.71B
| $4K | ﹤0.01% |
+127
| New | +$4.8K |
|
4164
CALL
Jakks Pacific
JAKK
$297M
| $4K | ﹤0.01% |
6
+1
| +20% | +$94 |
|
|
K
4165
CALL
DELISTED
Kellanova
K
| $4K | ﹤0.01% |
42
+24
| +133% | +$1.5K |
|
|
OPLN
4166
CALL
Openlane
OPLN
$4.25B
| $4K | ﹤0.01% |
+293
| New | +$4.16K |
|
4167
PUT
Lamar Advertising Co
LAMR
$16.3B
| $4K | ﹤0.01% |
29
+19
| +190% | +$1.06K |
|
4168
CALL
Leidos
LDOS
$14.5B
| $4K | ﹤0.01% |
32
+22
| +220% | +$918 |
|
4169
CALL
Lincoln National
LNC
$7.88B
| $4K | ﹤0.01% |
27
-61
| -69% | -$3.27K |
|
4170
CALL
Lesaka Technologies
LSAK
$392M
| $4K | ﹤0.01% |
36
-67
| -65% | -$1.27K |
|
4171
CALL
MBIA
MBI
$282M
| $4K | ﹤0.01% |
203
-719
| -78% | -$4.62K |
|
4172
Seres Therapeutics
MCRB
$47M
| $4K | ﹤0.01% |
+8
| New | +$6.53K |
|
|
MITT
4173
TPG Mortgage Investment Trust
MITT
$233M
| $4K | ﹤0.01% |
91
+19
| +26% | +$978 |
|
4174
MannKind Corp
MNKD
$1.22B
| $4K | ﹤0.01% |
278
-1,071
| -79% | -$22.7K |
|
4175
CALL
MasTec
MTZ
$26.6B
| $4K | ﹤0.01% |
+128
| New | +$2.23K |
|
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.