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 |
Apple
AAPL
|
+$70.1M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$46.6M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$37.4M |
| 4 |
Amazon
AMZN
|
+$37M |
| 5 |
Tesla
TSLA
|
+$28M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$41M |
| 2 |
Boeing
BA
|
+$27.8M |
| 3 |
Biogen
BIIB
|
+$18.9M |
| 4 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$13.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.75% |
| 2 | Consumer Discretionary | 0.58% |
| 3 | Communication Services | 0.33% |
| 4 | Healthcare | 0.31% |
| 5 | Industrials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
601
PUT
Nexstar Media Group
NXST
$5.55B
| $7.13M | 0.02% |
608
+429
| +240% | +$44.8K |
|
602
CALL
Dick's Sporting Goods
DKS
$18.8B
| $7.13M | 0.02% |
1,440
+417
| +41% | +$17.7K |
|
603
CALL
Corpay
CPAY
$23.5B
| $7.11M | 0.02% |
247
+136
| +123% | +$40.1K |
|
604
CALL
TSMC
TSM
$2.18T
| $7.11M | 0.02% |
1,223
-847
| -41% | -$44.9K |
|
|
SIVB
605
PUT
DELISTED
SVB Financial Group
SIVB
| $7.1M | 0.02% |
283
-344
| -55% | -$78.2K |
|
606
CALL
Ralph Lauren
RL
$23B
| $7.1M | 0.02% |
606
+255
| +73% | +$26.9K |
|
607
PUT
iShares Silver Trust
SLV
$28.8B
| $7.1M | 0.02% |
4,257
+93
| +2% | +$1.51K |
|
608
PUT
Edison International
EIX
$30.9B
| $7.08M | 0.02% |
939
+354
| +61% | +$25K |
|
609
PUT
Waste Management
WM
$94.9B
| $7.08M | 0.02% |
621
-230
| -27% | -$26K |
|
610
PUT
Acuity Brands
AYI
$9.93B
| $7.07M | 0.02% |
512
+463
| +945% | +$59.5K |
|
611
PUT
Willis Towers Watson
WTW
$27.1B
| $7.05M | 0.02% |
349
+40
| +13% | +$7.67K |
|
612
CALL
T. Rowe Price
TROW
$24.9B
| $7.04M | 0.02% |
578
-96
| -14% | -$11.3K |
|
613
CALL
Take-Two Interactive
TTWO
$43.4B
| $7.03M | 0.02% |
574
-174
| -23% | -$21.2K |
|
614
PUT
CarMax
KMX
$8.15B
| $7.01M | 0.02% |
800
+243
| +44% | +$22.9K |
|
|
AMTD
615
CALL
DELISTED
TD Ameritrade Holding Corp
AMTD
| $6.99M | 0.02% |
1,407
+1,261
| +864% | +$54.6K |
|
616
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$6.82B
| $6.99M | 0.02% |
+105,799
| New | +$6.13M |
|
617
Starbucks
SBUX
$119B
| $6.94M | 0.02% |
+78,941
| New | +$6.73M |
|
618
PUT
Zebra Technologies
ZBRA
$12.5B
| $6.92M | 0.02% |
271
-33
| -11% | -$7.72K |
|
619
PUT
Microchip Technology
MCHP
$46.2B
| $6.92M | 0.02% |
1,322
+784
| +146% | +$37.9K |
|
620
PUT
PPG Industries
PPG
$26.2B
| $6.91M | 0.02% |
518
+450
| +662% | +$57K |
|
621
CALL
Sony
SONY
$123B
| $6.91M | 0.02% |
5,080
+610
| +14% | +$7.61K |
|
622
CALL
SolarEdge
SEDG
$2.91B
| $6.89M | 0.02% |
725
+433
| +148% | +$37K |
|
|
SCHW
623
PUT
Charles Schwab
SCHW
$175B
| $6.87M | 0.02% |
1,444
+160
| +12% | +$7.05K |
|
624
T-Mobile US
TMUS
$207B
| $6.86M | 0.02% |
87,537
+86,864
| +12,907% | +$6.83M |
|
625
PUT
Boston Scientific
BSX
$63.9B
| $6.86M | 0.02% |
1,517
+221
| +17% | +$9.25K |
|
Similar funds
Simplex Trading's Q4 2019 Portfolio in Review
As of Q4 2019, Simplex Trading held 8,523 positions worth $45.7B, up 30% from $35.2B the previous quarter. Its ten largest holdings account for 39% of the portfolio.
Simplex Trading's Q4 2019 filing shows 1,277 new, 3,072 increased, 2,710 reduced and 1,251 closed positions. Its largest new stake was Apple: 1,090,316 shares worth $80M. The largest sale was Alibaba, an estimated $41M.
By sector, the portfolio is most concentrated in Technology at 0.75% of assets, up from 0.48% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q4 2019 buy was Apple: 1,090,316 shares worth $80M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q4 2019, an estimated $46.6M increase.
- Simplex Trading's biggest Q4 2019 reduction was Alibaba, cutting an estimated $41M.
- Simplex Trading fully exited Boeing in Q4 2019, selling an estimated $27.8M.
- Simplex Trading's ten largest holdings make up 39% of its $45.7B portfolio in Q4 2019.
- Simplex Trading opened 1,277 new positions and closed 1,251 in Q4 2019.
- Simplex Trading's portfolio value rose 30% quarter-over-quarter to $45.7B.
Based on Simplex Trading's 13F filing for Q4 2019, filed 5 Feb 2020.