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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
851
CALL
Sony
SONY
$122B
| $15.5M | 0.01% |
816,500
-555,000
| -40% | -$9.63M |
|
852
PUT
Maplebear
CART
$9.98B
| $15.4M | 0.01% |
655,700
+591,000
| +913% | +$14.9M |
|
853
PUT
Ross Stores
ROST
$74.7B
| $15.4M | 0.01% |
111,100
+2,300
| +2% | +$286K |
|
854
PUT
EQT Corp
EQT
$33.5B
| $15.3M | 0.01% |
396,300
-102,600
| -21% | -$4.16M |
|
855
CALL
Enbridge
ENB
$123B
| $15.3M | 0.01% |
424,800
+119,600
| +39% | +$4.03M |
|
856
PUT
AB InBev
BUD
$155B
| $15.3M | 0.01% |
236,400
+10,600
| +5% | +$626K |
|
857
PUT
AutoNation
AN
$6.85B
| $15.3M | 0.01% |
101,700
+81,900
| +414% | +$11.3M |
|
858
PUT
Electronic Arts
EA
$52.4B
| $15.2M | 0.01% |
111,300
+16,600
| +18% | +$2.19M |
|
|
FL
859
PUT
DELISTED
Foot Locker
FL
| $15.2M | 0.01% |
487,300
-31,500
| -6% | -$760K |
|
860
PUT
Generac Holdings
GNRC
$12.3B
| $15.1M | 0.01% |
117,200
-54,800
| -32% | -$6.01M |
|
861
CALL
Qualys
QLYS
$4.74B
| $15.1M | 0.01% |
77,100
+70,200
| +1,017% | +$12.3M |
|
862
Baidu
BIDU
$36.2B
| $15.1M | 0.01% |
126,712
+110,097
| +663% | +$12.7M |
|
863
CALL
Sprott Junior Uranium Miners ETF
URNJ
$322M
| $15.1M | 0.01% |
339,200
+142,900
| +73% | +$3.34M |
|
864
CALL
Royal Bank of Canada
RY
$289B
| $14.9M | 0.01% |
147,800
+700
| +0.5% | +$61.7K |
|
865
CALL
Tyler Technologies
TYL
$11.8B
| $14.9M | 0.01% |
35,700
+34,100
| +2,131% | +$13.6M |
|
866
CALL
PENN Entertainment
PENN
$2.73B
| $14.9M | 0.01% |
571,800
-140,700
| -20% | -$3.26M |
|
867
PUT
Interactive Brokers
IBKR
$40.5B
| $14.8M | 0.01% |
716,000
+672,400
| +1,542% | +$13.8M |
|
868
CALL
Tenet Healthcare
THC
$16.7B
| $14.8M | 0.01% |
196,000
+90,600
| +86% | +$5.74M |
|
869
PUT
Agilent Technologies
A
$39B
| $14.8M | 0.01% |
106,200
+74,300
| +233% | +$8.84M |
|
870
CALL
Equinix
EQIX
$102B
| $14.7M | 0.01% |
18,300
-7,700
| -30% | -$5.91M |
|
871
CALL
Kinder Morgan
KMI
$72.5B
| $14.7M | 0.01% |
863,400
-393,100
| -31% | -$6.7M |
|
872
PUT
GameStop
GME
$9.54B
| $14.7M | 0.01% |
838,600
-66,400
| -7% | -$975K |
|
873
CALL
Stryker
SYK
$120B
| $14.6M | 0.01% |
48,900
-29,800
| -38% | -$8.36M |
|
874
PUT
PennyMac Financial
PFSI
$4.3B
| $14.5M | 0.01% |
164,300
+12,400
| +8% | +$931K |
|
875
PUT
Canadian Natural Resources
CNQ
$97.5B
| $14.5M | 0.01% |
452,200
+176,200
| +64% | +$5.7M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.