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 | |
|---|---|---|---|---|---|---|
|
ALTR
651
CALL
DELISTED
Altera Corp
ALTR
| $236K | 0.03% |
+749
| New | +$26.8K |
|
|
CEMP
652
CALL
DELISTED
Cempra, Inc.
CEMP
| $235K | 0.03% |
196
-17
| -8% | -$511 |
|
|
LINE
653
PUT
DELISTED
LINN ENERGY LLC COM UTS REP LTD LIABILITY CO INTS
LINE
| $235K | 0.03% |
150
-378
| -72% | -$4.31K |
|
654
Western Union
WU
$2.65B
| $233K | 0.03% |
11,208
+9,316
| +492% | +$173K |
|
655
CALL
Micron Technology
MU
$1.08T
| $232K | 0.03% |
1,719
-2,768
| -62% | -$82.7K |
|
656
Tower Semiconductor
TSEM
$28.2B
| $232K | 0.03% |
+13,678
| New | +$210K |
|
657
Vanguard Health Care ETF
VHT
$17.8B
| $232K | 0.03% |
1,714
-2,108
| -55% | -$278K |
|
658
PUT
EOG Resources
EOG
$76.7B
| $231K | 0.03% |
1,155
+594
| +106% | +$53.7K |
|
659
PUT
KLA
KLAC
$280B
| $231K | 0.03% |
2,540
+640
| +34% | +$4.1K |
|
660
DTE Energy
DTE
$30.9B
| $230K | 0.03% |
+3,358
| New | +$241K |
|
661
Mondelez International
MDLZ
$78.1B
| $230K | 0.03% |
+6,386
| New | +$231K |
|
662
Cemex
CX
$18.4B
| $229K | 0.03% |
+27,255
| New | +$235K |
|
|
APOL
663
PUT
DELISTED
Apollo Education Group Inc Class A
APOL
| $229K | 0.03% |
+295
| New | +$7.79K |
|
|
GGP
664
DELISTED
GGP Inc.
GGP
| $229K | 0.03% |
+7,772
| New | +$232K |
|
665
TransDigm Group
TDG
$66.8B
| $228K | 0.03% |
+1,044
| New | +$220K |
|
666
PUT
McDonald's
MCD
$187B
| $227K | 0.03% |
2,195
+1,129
| +106% | +$107K |
|
667
PUT
MannKind Corp
MNKD
$1.19B
| $227K | 0.03% |
108
+56
| +108% | +$1.69K |
|
668
CALL
Vipshop
VIPS
$7.05B
| $227K | 0.03% |
362
-916
| -72% | -$22.2K |
|
|
DGI
669
DELISTED
DigitalGlobe Inc.
DGI
| $227K | 0.03% |
6,675
+4,987
| +295% | +$156K |
|
|
ANN
670
DELISTED
ANN INC
ANN
| $225K | 0.03% |
5,494
-1,733
| -24% | -$63.4K |
|
671
PUT
Melco Resorts & Entertainment
MLCO
$2.12B
| $224K | 0.03% |
392
-721
| -65% | -$17.3K |
|
672
Automatic Data Processing
ADP
$97.2B
| $223K | 0.03% |
2,607
+2,307
| +769% | +$199K |
|
|
VER
673
DELISTED
VEREIT, Inc.
VER
| $223K | 0.03% |
4,547
+1,755
| +63% | +$84K |
|
|
SODA
674
DELISTED
SodaStream International Ltd
SODA
| $223K | 0.03% |
+11,028
| New | +$208K |
|
675
Fluor
FLR
$7.21B
| $222K | 0.03% |
+3,897
| New | +$221K |
|
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.