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 | |
|---|---|---|---|---|---|---|
326
PUT
D.R. Horton
DHI
$40.4B
| $52.9M | 0.03% |
478,300
+202,000
| +73% | +$24.9M |
|
327
CALL
Dollar Tree
DLTR
$23.5B
| $52.9M | 0.03% |
372,100
+67,700
| +22% | +$8.02M |
|
328
PUT
Li Auto
LI
$12B
| $52.8M | 0.03% |
1,411,700
+350,900
| +33% | +$12.7M |
|
329
CALL
Diamondback Energy
FANG
$57.1B
| $52.2M | 0.03% |
336,800
+70,200
| +26% | +$11M |
|
330
CALL
iShares MSCI Australia ETF
EWA
$1.35B
| $51.7M | 0.03% |
1,365,200
-1,564,000
| -53% | -$34.7M |
|
331
PUT
AbbVie
ABBV
$448B
| $51.6M | 0.03% |
333,200
-100,300
| -23% | -$14.6M |
|
332
CALL
NIO
NIO
$11.7B
| $51.6M | 0.03% |
5,686,900
+1,923,100
| +51% | +$15.3M |
|
333
PUT
Apollo Global Management
APO
$68.6B
| $51.4M | 0.03% |
551,600
+96,300
| +21% | +$8.5M |
|
334
CALL
Sarepta Therapeutics
SRPT
$1.67B
| $51.3M | 0.03% |
531,700
+295,500
| +125% | +$28.3M |
|
335
PUT
Coca-Cola
KO
$354B
| $51.1M | 0.03% |
1,062,300
-1,398,500
| -57% | -$79.4M |
|
336
CALL
NextEra Energy
NEE
$186B
| $51M | 0.03% |
840,200
+189,900
| +29% | +$10.8M |
|
337
CALL
Accenture
ACN
$85.7B
| $51M | 0.03% |
145,300
-53,700
| -27% | -$17.3M |
|
338
CALL
Take-Two Interactive
TTWO
$43.4B
| $51M | 0.03% |
332,700
+158,200
| +91% | +$23.6M |
|
|
339
KraneShares CSI China Internet ETF
KWEB
$5.23B
| $50.8M | 0.03% |
1,881,475
+1,538,736
| +449% | +$41.7M |
|
340
PUT
AutoZone
AZO
$48.5B
| $50.7M | 0.03% |
19,600
+9,500
| +94% | +$24.6M |
|
341
State Street Utilities Select Sector SPDR ETF
XLU
$23.9B
| $50.6M | 0.03% |
1,597,646
+196,296
| +14% | +$6M |
|
342
CALL
Medtronic
MDT
$105B
| $50.6M | 0.03% |
614,000
-222,800
| -27% | -$17M |
|
343
PUT
Texas Instruments
TXN
$268B
| $50.5M | 0.03% |
486,800
+332,300
| +215% | +$51.5M |
|
344
CALL
Twilio
TWLO
$27.8B
| $50.2M | 0.03% |
661,600
-86,100
| -12% | -$5.37M |
|
345
CALL
Fortinet
FTNT
$114B
| $50.2M | 0.03% |
857,500
+334,900
| +64% | +$18.5M |
|
346
CALL
Comcast
CMCSA
$84B
| $50M | 0.03% |
1,141,000
+109,200
| +11% | +$4.68M |
|
347
CALL
Cameco
CCJ
$39.4B
| $49.8M | 0.03% |
1,155,400
+438,600
| +61% | +$18.4M |
|
348
CALL
Colgate-Palmolive
CL
$73.3B
| $49.6M | 0.03% |
622,700
+538,500
| +640% | +$40.5M |
|
349
CALL
Analog Devices
ADI
$188B
| $49.6M | 0.03% |
249,900
+49,500
| +25% | +$8.84M |
|
350
PUT
Vertex Pharmaceuticals
VRTX
$120B
| $49.6M | 0.03% |
121,900
+39,400
| +48% | +$14.6M |
|
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.