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
|
+$83.1M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$37.2M |
| 3 |
Amgen
AMGN
|
+$30.5M |
| 4 |
Micron Technology
MU
|
+$28.8M |
| 5 |
Qualcomm
QCOM
|
+$18.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$29.5M |
| 2 |
Goldman Sachs
GS
|
+$27.8M |
| 3 |
Gilead Sciences
GILD
|
+$27.6M |
| 4 |
Booking.com
BKNG
|
+$25.4M |
| 5 |
AT&T
T
|
+$19.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 13.55% |
| 2 | Communication Services | 11.57% |
| 3 | Consumer Discretionary | 9.69% |
| 4 | Healthcare | 7.28% |
| 5 | Financials | 4.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3076
CALL
Dynagas LNG Partners
DLNG
$131M
| $25K | ﹤0.01% |
433
+254
| +142% | +$4K |
|
3077
8x8 Inc
EGHT
$247M
| $25K | ﹤0.01% |
1,719
-432
| -20% | -$6.13K |
|
|
EXK
3078
Endeavour Silver
EXK
$2.32B
| $25K | ﹤0.01% |
8,283
-533
| -6% | -$1.65K |
|
|
FLNT
3079
CALL
Fluent
FLNT
$102M
| $25K | ﹤0.01% |
108
+91
| +535% | +$2.77K |
|
3080
CALL
Gerdau
GGB
$9.44B
| $25K | ﹤0.01% |
+1,070
| New | +$2.53K |
|
3081
G-III Apparel Group
GIII
$1.47B
| $25K | ﹤0.01% |
+1,012
| New | +$23.5K |
|
3082
CALL
IDEX
IEX
$16.5B
| $25K | ﹤0.01% |
+76
| New | +$7.99K |
|
|
BRSL
3083
PUT
Brightstar Lottery PLC
BRSL
$1.91B
| $25K | ﹤0.01% |
166
+49
| +42% | +$1K |
|
|
IMOS
3084
ChipMOS TECHNOLOGIES
IMOS
$1.92B
| $25K | ﹤0.01% |
+1,095
| New | +$24.4K |
|
3085
PUT
Johnson Controls International
JCI
$87.5B
| $25K | ﹤0.01% |
614
-363
| -37% | -$15.2K |
|
3086
Standard BioTools
LAB
$326M
| $25K | ﹤0.01% |
6,403
+4,530
| +242% | +$21.5K |
|
3087
CALL
Monarch Casino & Resort
MCRI
$2.14B
| $25K | ﹤0.01% |
150
| – | – |
|
3088
PUT
Myriad Genetics
MYGN
$530M
| $25K | ﹤0.01% |
353
+293
| +488% | +$6.22K |
|
3089
CALL
RingCentral
RNG
$4.05B
| $25K | ﹤0.01% |
70
-102
| -59% | -$3.37K |
|
3090
PUT
SolarEdge
SEDG
$2.59B
| $25K | ﹤0.01% |
492
+261
| +113% | +$4.62K |
|
3091
PUT
Sprouts Farmers Market
SFM
$7.04B
| $25K | ﹤0.01% |
386
-309
| -44% | -$7.16K |
|
3092
PUT
Shake Shack
SHAK
$2.3B
| $25K | ﹤0.01% |
182
+121
| +198% | +$4.33K |
|
3093
CALL
Stanley Black & Decker
SWK
$14.2B
| $25K | ﹤0.01% |
171
+64
| +60% | +$8.78K |
|
3094
Targa Resources
TRGP
$60.4B
| $25K | ﹤0.01% |
561
+261
| +87% | +$13.1K |
|
3095
PUT
Vuzix
VUZI
$190M
| $25K | ﹤0.01% |
187
-152
| -45% | -$901 |
|
3096
Woodward
WWD
$25B
| $25K | ﹤0.01% |
+374
| New | +$25.5K |
|
3097
CALL
XBiotech
XBIT
$69.2M
| $25K | ﹤0.01% |
104
-34
| -25% | -$326 |
|
3098
PUT
ZTO Express
ZTO
$18.2B
| $25K | ﹤0.01% |
460
+6
| +1% | +$83 |
|
|
SAVE
3099
PUT
DELISTED
Spirit Airlines, Inc.
SAVE
| $25K | ﹤0.01% |
218
+204
| +1,457% | +$11.2K |
|
|
SRCL
3100
PUT
DELISTED
Stericycle Inc
SRCL
| $25K | ﹤0.01% |
80
-236
| -75% | -$19.4K |
|
Similar funds
Simplex Trading's Q2 2017 Portfolio in Review
As of Q2 2017, Simplex Trading held 7,527 positions worth $2.3B, down 0.39% from $2.31B the previous quarter. Its ten largest holdings account for 23% of the portfolio.
Simplex Trading withdrew a net $114M in Q2 2017, closing 1,474 positions and reducing 2,320 holdings. Its most notable exit was AT&T, an estimated $19.6M position sold in full.
By sector, the portfolio is most concentrated in Technology at 14% of assets, up from 9.7% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amgen worth $32.3M.
- Simplex Trading's largest Q2 2017 buy was Amgen: 187,633 shares worth $32.3M.
- Simplex Trading added most to Amazon in Q2 2017, an estimated $83.1M increase.
- Simplex Trading's biggest Q2 2017 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $29.5M.
- Simplex Trading fully exited AT&T in Q2 2017, selling an estimated $19.6M.
- Simplex Trading's ten largest holdings make up 23% of its $2.3B portfolio in Q2 2017.
- Simplex Trading opened 1,408 new positions and closed 1,474 in Q2 2017.
- Simplex Trading's portfolio value fell 0.39% quarter-over-quarter to $2.3B.
Based on Simplex Trading's 13F filing for Q2 2017, filed 12 Jul 2017.