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 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1251
PUT
Domino's
DPZ
$10.7B
| $182K | 0.01% |
213
-180
| -46% | -$35K |
|
1252
PUT
GoPro
GPRO
$119M
| $182K | 0.01% |
637
-955
| -60% | -$8.95K |
|
1253
PUT
Kinder Morgan
KMI
$72.9B
| $182K | 0.01% |
405
-1,782
| -81% | -$34.7K |
|
|
PGNX
1254
DELISTED
Progenics Pharmaceuticals Inc
PGNX
| $182K | 0.01% |
24,812
+22,544
| +994% | +$143K |
|
|
P
1255
CALL
DELISTED
Pandora Media Inc
P
| $182K | 0.01% |
3,412
-1,945
| -36% | -$16.7K |
|
1256
CALL
iShares Morningstar Value ETF
ILCV
$1.29B
| $181K | 0.01% |
4,908
-4,448
| -48% | -$216K |
|
1257
Odyssey Marine Exploration
OMEX
$42.8M
| $181K | 0.01% |
41,718
+39,213
| +1,565% | +$164K |
|
1258
ProShares UltraShort Yen
YCS
$34.5M
| $181K | 0.01% |
+9,784
| New | +$176K |
|
1259
Main Street Capital
MAIN
$4.94B
| $180K | 0.01% |
4,532
+4,279
| +1,691% | +$168K |
|
1260
Navient
NAVI
$793M
| $180K | 0.01% |
12,005
+1,287
| +12% | +$18.8K |
|
1261
CALL
Paychex
PAYX
$39.4B
| $180K | 0.01% |
1,001
+161
| +19% | +$9.2K |
|
1262
CALL
Regions Financial
RF
$26.2B
| $180K | 0.01% |
660
-570
| -46% | -$8.2K |
|
1263
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$332M
| $180K | 0.01% |
+50
| New | +$194K |
|
|
JOBS
1264
DELISTED
51job Inc
JOBS
| $180K | 0.01% |
2,970
+2,243
| +309% | +$122K |
|
|
AKRX
1265
CALL
DELISTED
Akorn Inc
AKRX
| $180K | 0.01% |
911
+549
| +152% | +$18.2K |
|
1266
PUT
AngloGold Ashanti
AU
$39.7B
| $179K | 0.01% |
1,465
+400
| +38% | +$3.87K |
|
1267
CALL
Elevance Health
ELV
$82.3B
| $179K | 0.01% |
198
+36
| +22% | +$6.85K |
|
1268
KB Financial Group
KB
$42.4B
| $179K | 0.01% |
3,654
+3,369
| +1,182% | +$168K |
|
1269
Quantum Corp
QMCO
$455M
| $179K | 0.01% |
+1,466
| New | +$197K |
|
|
PX
1270
DELISTED
Praxair Inc
PX
| $179K | 0.01% |
1,282
-2,619
| -67% | -$349K |
|
|
GNCMA
1271
DELISTED
GCI Liberty, Inc. Class A-1 Common Stock
GNCMA
| $179K | 0.01% |
+4,405
| New | +$180K |
|
1272
CALL
American Tower
AMT
$76.7B
| $178K | 0.01% |
391
-37
| -9% | -$5.15K |
|
|
ARNA
1273
CALL
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $178K | 0.01% |
698
+432
| +162% | +$9.91K |
|
1274
PUT
Lam Research
LRCX
$400B
| $177K | 0.01% |
9,660
+3,810
| +65% | +$61.8K |
|
1275
CALL
MKS Inc
MKSI
$23.3B
| $177K | 0.01% |
108
+28
| +35% | +$2.29K |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.