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
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1226
PUT
Nike
NKE
$62.2B
| $81K | 0.01% |
1,536
+1,288
| +519% | +$61.6K |
|
1227
CALL
ResMed
RMD
$28.4B
| $81K | 0.01% |
+141
| New | +$9.16K |
|
1228
TD Synnex
SNX
$19.4B
| $81K | 0.01% |
+2,112
| New | +$81.2K |
|
|
NFX
1229
CALL
DELISTED
Newfield Exploration
NFX
| $81K | 0.01% |
492
-157
| -24% | -$4.76K |
|
|
NSR
1230
PUT
DELISTED
Neustar Inc
NSR
| $81K | 0.01% |
292
+252
| +630% | +$6.36K |
|
|
TXTR
1231
PUT
DELISTED
TEXTURA CORPORATION COM
TXTR
| $81K | 0.01% |
113
+106
| +1,514% | +$2.8K |
|
|
WNR
1232
CALL
DELISTED
Western Refining Inc
WNR
| $81K | 0.01% |
119
+114
| +2,280% | +$4.76K |
|
|
BLUE
1233
PUT
DELISTED
bluebird bio
BLUE
| $80K | 0.01% |
12
+4
| +50% | +$5.28K |
|
1234
Coherent
COHR
$55.6B
| $80K | 0.01% |
4,340
+2,944
| +211% | +$48.5K |
|
1235
CALL
Emerson Electric
EMR
$82.5B
| $80K | 0.01% |
350
+314
| +872% | +$18.2K |
|
1236
Gentex
GNTX
$4.81B
| $80K | 0.01% |
+4,386
| New | +$77.4K |
|
1237
Interactive Brokers
IBKR
$40.6B
| $80K | 0.01% |
+9,448
| New | +$75K |
|
1238
CALL
Icon
ICLR
$12.9B
| $80K | 0.01% |
+43
| New | +$2.67K |
|
1239
CALL
Kohl's
KSS
$2.08B
| $80K | 0.01% |
307
+286
| +1,362% | +$19.5K |
|
1240
CALL
Lam Research
LRCX
$381B
| $80K | 0.01% |
870
+70
| +9% | +$553 |
|
|
SCHW
1241
CALL
Charles Schwab
SCHW
$177B
| $80K | 0.01% |
322
+268
| +496% | +$7.77K |
|
|
KSU
1242
PUT
DELISTED
Kansas City Southern
KSU
| $80K | 0.01% |
126
+19
| +18% | +$2.15K |
|
|
ALXN
1243
CALL
DELISTED
Alexion Pharmaceuticals
ALXN
| $80K | 0.01% |
+187
| New | +$33.8K |
|
|
TLM
1244
DELISTED
TALISMAN ENERGY INC
TLM
| $80K | 0.01% |
+10,541
| New | +$80.6K |
|
1245
CALL
Dillards
DDS
$8.89B
| $79K | 0.01% |
52
-53
| -50% | -$6.61K |
|
1246
Globalstar
GSAT
$10.2B
| $79K | 0.01% |
1,601
-109
| -6% | -$4.5K |
|
1247
CALL
Labcorp
LH
$24.3B
| $79K | 0.01% |
52
+3
| +6% | +$309 |
|
1248
PUT
MBIA
MBI
$291M
| $79K | 0.01% |
259
+35
| +16% | +$312 |
|
|
FUEL
1249
DELISTED
Rocket Fuel Inc.
FUEL
| $79K | 0.01% |
8,596
-4,498
| -34% | -$54.5K |
|
|
PCYC
1250
PUT
DELISTED
PHARMACYCLICS INC
PCYC
| $79K | 0.01% |
285
+238
| +506% | +$45.9K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.