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 | |
|---|---|---|---|---|---|---|
976
American Tower
AMT
$76.7B
| $12M | 0.01% |
55,537
-12,417
| -18% | -$2.35M |
|
977
PUT
General Dynamics
GD
$103B
| $12M | 0.01% |
46,100
+14,100
| +44% | +$3.44M |
|
978
PUT
Kimberly-Clark
KMB
$35.6B
| $12M | 0.01% |
98,500
+20,400
| +26% | +$2.47M |
|
|
IRBT
979
PUT
DELISTED
iRobot
IRBT
| $11.8M | 0.01% |
305,900
+111,900
| +58% | +$3.98M |
|
|
EXE
980
CALL
Expand Energy Corp
EXE
$21.9B
| $11.8M | 0.01% |
153,800
-95,600
| -38% | -$7.85M |
|
981
CALL
Wingstop
WING
$3.67B
| $11.8M | 0.01% |
46,100
+28,800
| +166% | +$6.22M |
|
|
BNY
982
PUT
Bank of New York Mellon
BNY
$109B
| $11.8M | 0.01% |
227,000
-4,800
| -2% | -$221K |
|
983
Alcoa
AA
$11.9B
| $11.8M | 0.01% |
347,332
+275,768
| +385% | +$7.46M |
|
984
CALL
CME Group
CME
$91.9B
| $11.8M | 0.01% |
55,900
-32,600
| -37% | -$6.96M |
|
|
GTM
985
PUT
ZoomInfo Technologies
GTM
$849M
| $11.8M | 0.01% |
636,000
+228,400
| +56% | +$3.58M |
|
986
CALL
Madrigal Pharmaceuticals
MDGL
$12.5B
| $11.7M | 0.01% |
50,600
+800
| +2% | +$140K |
|
987
CALL
Chubb
CB
$137B
| $11.7M | 0.01% |
51,700
+8,000
| +18% | +$1.75M |
|
988
PUT
Sony
SONY
$122B
| $11.7M | 0.01% |
616,000
+224,500
| +57% | +$3.89M |
|
|
FITB
989
CALL
Fifth Third Bancorp
FITB
$51.8B
| $11.7M | 0.01% |
338,000
-96,700
| -22% | -$2.68M |
|
990
PUT
Signet Jewelers
SIG
$3.48B
| $11.6M | 0.01% |
108,400
+45,800
| +73% | +$3.76M |
|
991
CALL
J.M. Smucker
SJM
$12.4B
| $11.6M | 0.01% |
91,900
+65,300
| +245% | +$7.57M |
|
|
FISV
992
PUT
Fiserv Inc
FISV
$26.6B
| $11.6M | 0.01% |
87,300
+26,900
| +45% | +$3.3M |
|
993
CALL
TC Energy
TRP
$72.9B
| $11.6M | 0.01% |
296,400
+101,400
| +52% | +$3.7M |
|
994
PUT
Teva Pharmaceuticals
TEVA
$36.3B
| $11.6M | 0.01% |
1,108,300
-26,900
| -2% | -$251K |
|
|
PARA
995
DELISTED
Paramount Global Class B
PARA
| $11.6M | 0.01% |
781,676
+195,507
| +33% | +$2.62M |
|
996
CALL
Elbit Systems
ESLT
$37.9B
| $11.6M | 0.01% |
54,200
-12,700
| -19% | -$2.56M |
|
997
PUT
Global Payments
GPN
$21.3B
| $11.5M | 0.01% |
90,900
+31,000
| +52% | +$3.59M |
|
998
PUT
Insulet
PODD
$11B
| $11.5M | 0.01% |
53,200
+36,300
| +215% | +$6.23M |
|
999
PUT
CRISPR Therapeutics
CRSP
$4.68B
| $11.5M | 0.01% |
184,200
+53,200
| +41% | +$2.94M |
|
1000
PUT
Harley-Davidson
HOG
$2.79B
| $11.5M | 0.01% |
312,400
-63,900
| -17% | -$1.97M |
|
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.