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 | |
|---|---|---|---|---|---|---|
201
PUT
Delta Air Lines
DAL
$55.5B
| $88.4M | 0.06% |
2,198,500
+1,153,000
| +110% | +$41.8M |
|
202
CALL
Ulta Beauty
ULTA
$20.8B
| $88.4M | 0.06% |
180,500
+6,200
| +4% | +$2.62M |
|
203
CALL
Wells Fargo
WFC
$263B
| $88.3M | 0.06% |
1,794,800
-187,800
| -9% | -$8.1M |
|
204
PUT
American Airlines Group
AAL
$10.1B
| $87.9M | 0.06% |
6,396,300
+2,065,100
| +48% | +$25.9M |
|
205
CALL
Procter & Gamble
PG
$350B
| $87.8M | 0.06% |
599,000
-124,300
| -17% | -$18.4M |
|
|
NVO
206
PUT
Novo Nordisk
NVO
$215B
| $87.6M | 0.06% |
846,400
-142,700
| -14% | -$14.1M |
|
207
PUT
United Airlines
UAL
$38.5B
| $87.2M | 0.06% |
2,113,800
+819,800
| +63% | +$32.2M |
|
208
PUT
Union Pacific
UNP
$174B
| $87.1M | 0.06% |
404,500
+20,300
| +5% | +$4.46M |
|
|
X
209
CALL
DELISTED
US Steel
X
| $86.7M | 0.06% |
1,782,100
+100,700
| +6% | +$3.66M |
|
210
PUT
IBM
IBM
$197B
| $85.3M | 0.05% |
697,600
+113,600
| +19% | +$17.2M |
|
211
PUT
Palantir
PLTR
$304B
| $84.8M | 0.05% |
4,940,000
+1,051,800
| +27% | +$18.7M |
|
212
CALL
Li Auto
LI
$12.1B
| $84.3M | 0.05% |
2,252,100
+570,900
| +34% | +$20.6M |
|
213
PUT
RH
RH
$3.33B
| $83.2M | 0.05% |
285,500
+43,400
| +18% | +$11.2M |
|
214
CALL
Bristol-Myers Squibb
BMY
$125B
| $83M | 0.05% |
1,616,900
+498,600
| +45% | +$26.2M |
|
215
PUT
Carnival Corporation Ltd
CCL
$36B
| $82.7M | 0.05% |
4,459,900
+1,192,600
| +37% | +$17.3M |
|
216
PUT
Marathon Digital Holdings
MARA
$4.78B
| $82.5M | 0.05% |
3,512,300
+1,022,800
| +41% | +$12.9M |
|
217
PUT
iShares MSCI Australia ETF
EWA
$1.35B
| $82.4M | 0.05% |
2,346,400
-762,900
| -25% | -$16.9M |
|
218
PUT
Starbucks
SBUX
$118B
| $82.2M | 0.05% |
856,200
+202,100
| +31% | +$19.7M |
|
219
PUT
Enphase Energy
ENPH
$5.33B
| $82M | 0.05% |
620,800
-110,000
| -15% | -$11.7M |
|
220
CALL
T-Mobile US
TMUS
$206B
| $81.4M | 0.05% |
507,700
-56,700
| -10% | -$8.39M |
|
|
221
PUT
T-Mobile US
TMUS
$206B
| $81.1M | 0.05% |
505,900
-59,400
| -11% | -$8.79M |
|
|
222
PUT
Ulta Beauty
ULTA
$20.8B
| $80.4M | 0.05% |
164,100
+3,800
| +2% | +$1.6M |
|
223
PUT
JD.com
JD
$40.8B
| $80.2M | 0.05% |
2,776,900
+448,600
| +19% | +$12.2M |
|
|
224
CALL
RH
RH
$3.33B
| $79.8M | 0.05% |
273,800
+68,700
| +33% | +$17.7M |
|
225
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$415M
| $79.8M | 0.05% |
300,440
+40,700
| +16% | +$19.5M |
|
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.