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 | |
|---|---|---|---|---|---|---|
1201
Insmed
INSM
$23.3B
| $131K | 0.01% |
+7,107
| New | +$177K |
|
1202
PUT
Novartis
NVS
$297B
| $131K | 0.01% |
218
+63
| +41% | +$5.61K |
|
|
PHH
1203
PUT
DELISTED
PHH Corporation
PHH
| $131K | 0.01% |
+159
| New | +$3.11K |
|
|
BWLD
1204
PUT
DELISTED
Buffalo Wild Wings, Inc.
BWLD
| $131K | 0.01% |
219
+72
| +49% | +$13.5K |
|
|
LOCK
1205
DELISTED
LifeLock, Inc.
LOCK
| $131K | 0.01% |
+15,004
| New | +$148K |
|
1206
CALL
D.R. Horton
DHI
$39.9B
| $130K | 0.01% |
749
+460
| +159% | +$13.6K |
|
|
GES
1207
CALL
DELISTED
Guess Inc
GES
| $130K | 0.01% |
239
+38
| +19% | +$823 |
|
1208
HDFC Bank
HDB
$119B
| $130K | 0.01% |
+8,516
| New | +$129K |
|
1209
iShares Russell Mid-Cap Value ETF
IWS
$15.6B
| $130K | 0.01% |
+1,942
| New | +$138K |
|
1210
CALL
Kraft Heinz
KHC
$30.1B
| $130K | 0.01% |
+630
| New | +$47.6K |
|
1211
TriNet
TNET
$2.77B
| $130K | 0.01% |
7,763
+7,168
| +1,205% | +$147K |
|
|
CPN
1212
DELISTED
Calpine Corporation
CPN
| $130K | 0.01% |
+8,943
| New | +$147K |
|
1213
PUT
Angi Inc
ANGI
$219M
| $129K | 0.01% |
6
+4
| +200% | +$204 |
|
1214
CALL
Blackstone
BX
$99.6B
| $129K | 0.01% |
2,479
+2,198
| +782% | +$79.5K |
|
1215
CALL
Micron Technology
MU
$1.12T
| $129K | 0.01% |
1,443
+214
| +17% | +$3.68K |
|
1216
PUT
NETSCOUT
NTCT
$2.82B
| $129K | 0.01% |
89
+76
| +585% | +$2.88K |
|
1217
Allegiant Air
ALGT
$2.54B
| $128K | 0.01% |
+592
| New | +$124K |
|
1218
Ameriprise Financial
AMP
$46B
| $128K | 0.01% |
1,173
-249
| -18% | -$29.4K |
|
1219
PUT
Box
BOX
$3.92B
| $128K | 0.01% |
172
+78
| +83% | +$1.16K |
|
1220
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.25B
| $128K | 0.01% |
3,805
-155
| -4% | -$5.7K |
|
1221
PUT
Vanguard S&P 500 ETF
VOO
$967B
| $128K | 0.01% |
525
-774
| -60% | -$144K |
|
|
ZAYO
1222
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $128K | 0.01% |
5,053
+2,138
| +73% | +$57.5K |
|
|
WIN
1223
DELISTED
Windstream Holdings Inc
WIN
| $128K | 0.01% |
+4,175
| New | +$130K |
|
|
MDVN
1224
CALL
DELISTED
MEDIVATION, INC.
MDVN
| $128K | 0.01% |
259
-27
| -9% | -$1.34K |
|
1225
American Coastal Insurance
ACIC
$484M
| $127K | 0.01% |
9,661
+329
| +4% | +$4.73K |
|
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.