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 | |
|---|---|---|---|---|---|---|
|
DATA
876
CALL
DELISTED
Tableau Software, Inc.
DATA
| $338K | 0.01% |
370
-48
| -11% | -$2.81K |
|
877
CALL
Comcast
CMCSA
$78.3B
| $336K | 0.01% |
2,697
-1,062
| -28% | -$41.9K |
|
878
Entergy
ETR
$54B
| $336K | 0.01% |
+8,772
| New | +$339K |
|
879
Ross Stores
ROST
$74.5B
| $336K | 0.01% |
5,832
+3,219
| +123% | +$201K |
|
880
CALL
Under Armour Class C
UA
$2.81B
| $336K | 0.01% |
2,779
+195
| +8% | +$3.67K |
|
881
CALL
Domino's
DPZ
$10.7B
| $335K | 0.01% |
85
-40
| -32% | -$7.9K |
|
882
PUT
Electronic Arts
EA
$52.4B
| $334K | 0.01% |
2,163
+1,996
| +1,195% | +$206K |
|
|
EXAS
883
CALL
DELISTED
Exact Sciences
EXAS
| $334K | 0.01% |
395
-535
| -58% | -$16.5K |
|
884
Lands' End
LE
$358M
| $333K | 0.01% |
22,398
+19,966
| +821% | +$380K |
|
885
Sun Life Financial
SLF
$45.1B
| $333K | 0.01% |
+9,323
| New | +$322K |
|
886
BioCryst Pharmaceuticals
BCRX
$2.38B
| $331K | 0.01% |
59,614
+55,402
| +1,315% | +$337K |
|
887
Direxion Daily MSCI Emerging Markets Bull 3X ETF
EDC
$156M
| $331K | 0.01% |
+3,878
| New | +$314K |
|
888
Pampa Energía
PAM
$4.78B
| $331K | 0.01% |
+5,637
| New | +$335K |
|
889
Teekay
TK
$973M
| $331K | 0.01% |
49,710
+46,805
| +1,611% | +$345K |
|
890
Babcock & Wilcox
BW
$1.64B
| $330K | 0.01% |
2,814
+2,678
| +1,969% | +$276K |
|
891
Molina Healthcare
MOH
$10.4B
| $330K | 0.01% |
4,775
-16,034
| -77% | -$984K |
|
892
Assured Guaranty
AGO
$3.73B
| $329K | 0.01% |
7,884
-63,493
| -89% | -$2.5M |
|
|
EXAS
893
DELISTED
Exact Sciences
EXAS
| $329K | 0.01% |
9,312
+2,059
| +28% | +$63.6K |
|
|
SCHW
894
CALL
Charles Schwab
SCHW
$177B
| $329K | 0.01% |
1,960
+1,123
| +134% | +$45K |
|
895
CALL
Idexx Laboratories
IDXX
$42.5B
| $328K | 0.01% |
153
-4
| -3% | -$650 |
|
896
Sempra
SRE
$61.1B
| $326K | 0.01% |
+5,800
| New | +$328K |
|
|
CTRA
897
PUT
DELISTED
Coterra Energy
CTRA
| $325K | 0.01% |
2,067
+1,812
| +711% | +$42.8K |
|
898
Annaly Capital Management
NLY
$16.7B
| $325K | 0.01% |
6,758
+5,356
| +382% | +$253K |
|
899
Smith & Nephew
SNN
$12.5B
| $325K | 0.01% |
9,344
+2,918
| +45% | +$98.8K |
|
900
CALL
Vanguard S&P 500 ETF
VOO
$967B
| $325K | 0.01% |
1,040
-294
| -22% | -$64.7K |
|
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.