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 | |
|---|---|---|---|---|---|---|
3251
Alexandria Real Estate Equities
ARE
$8.96B
| $12K | ﹤0.01% |
+144
| New | +$12.9K |
|
|
EFOR
3252
Everforth Inc
EFOR
$884M
| $12K | ﹤0.01% |
+335
| New | +$12.7K |
|
3253
CALL
Brunswick
BC
$5.24B
| $12K | ﹤0.01% |
+104
| New | +$5.29K |
|
3254
PUT
Builders FirstSource
BLDR
$7.82B
| $12K | ﹤0.01% |
+51
| New | +$724 |
|
|
BRKL
3255
DELISTED
Brookline Bancorp
BRKL
| $12K | ﹤0.01% |
+1,263
| New | +$13.7K |
|
3256
PUT
Conagra Brands
CAG
$7.29B
| $12K | ﹤0.01% |
76
-38
| -33% | -$1.28K |
|
3257
PUT
Cardinal Health
CAH
$53.7B
| $12K | ﹤0.01% |
21
+15
| +250% | +$1.25K |
|
3258
Cadiz
CDZI
$259M
| $12K | ﹤0.01% |
1,695
-1,243
| -42% | -$10.2K |
|
3259
CALL
CNX Resources
CNX
$4.77B
| $12K | ﹤0.01% |
1,386
+1,085
| +360% | +$13.5K |
|
3260
Carpenter Technology
CRS
$28.8B
| $12K | ﹤0.01% |
+420
| New | +$15.3K |
|
3261
PUT
Ducommun
DCO
$2.77B
| $12K | ﹤0.01% |
129
+119
| +1,190% | +$2.77K |
|
3262
CALL
Devon Energy
DVN
$49.8B
| $12K | ﹤0.01% |
283
-36
| -11% | -$1.65K |
|
3263
PUT
EnerSys
ENS
$6.94B
| $12K | ﹤0.01% |
+51
| New | +$2.94K |
|
3264
FirstEnergy
FE
$28.5B
| $12K | ﹤0.01% |
+407
| New | +$13.3K |
|
3265
CALL
Comfort Systems
FIX
$60.9B
| $12K | ﹤0.01% |
91
+31
| +52% | +$831 |
|
|
FOLD
3266
CALL
DELISTED
Amicus Therapeutics
FOLD
| $12K | ﹤0.01% |
165
+41
| +33% | +$643 |
|
3267
PUT
Generac Holdings
GNRC
$11.6B
| $12K | ﹤0.01% |
19
-1
| -5% | -$32 |
|
3268
CALL
Interactive Brokers
IBKR
$41.1B
| $12K | ﹤0.01% |
244
+172
| +239% | +$1.77K |
|
3269
Innospec
IOSP
$2.11B
| $12K | ﹤0.01% |
267
+39
| +17% | +$1.79K |
|
3270
iShares Micro-Cap ETF
IWC
$1.45B
| $12K | ﹤0.01% |
+174
| New | +$13.3K |
|
3271
PUT
Kinross Gold
KGC
$28.6B
| $12K | ﹤0.01% |
310
+304
| +5,067% | +$556 |
|
3272
CALL
Mid-America Apartment Communities
MAA
$15.5B
| $12K | ﹤0.01% |
+79
| New | +$6.23K |
|
3273
CALL
MGM Resorts International
MGM
$11.8B
| $12K | ﹤0.01% |
200
+165
| +471% | +$3.3K |
|
3274
Mine Safety
MSA
$6.78B
| $12K | ﹤0.01% |
+308
| New | +$14.3K |
|
3275
NGL Energy Partners
NGL
$1.87B
| $12K | ﹤0.01% |
+625
| New | +$15.9K |
|
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.