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 | |
|---|---|---|---|---|---|---|
226
CALL
Royal Caribbean
RCL
$76.7B
| $79.7M | 0.05% |
615,500
-240,100
| -28% | -$24.5M |
|
227
CALL
American Express
AXP
$238B
| $79.5M | 0.05% |
424,600
+139,400
| +49% | +$22.4M |
|
|
X
228
PUT
DELISTED
US Steel
X
| $79.3M | 0.05% |
1,629,600
+76,800
| +5% | +$2.79M |
|
229
CALL
Coca-Cola
KO
$354B
| $79.3M | 0.05% |
1,345,300
-176,000
| -12% | -$10M |
|
230
PUT
DexCom
DXCM
$27.6B
| $79M | 0.05% |
636,900
+221,200
| +53% | +$22.6M |
|
231
CALL
Sea Limited
SE
$64.2B
| $78.5M | 0.05% |
1,939,500
+334,400
| +21% | +$13.6M |
|
232
CALL
Affirm
AFRM
$24.8B
| $78.1M | 0.05% |
1,589,700
+204,200
| +15% | +$5.9M |
|
233
PUT
Wayfair
W
$11.1B
| $77.9M | 0.05% |
1,262,100
+208,600
| +20% | +$10.9M |
|
234
PUT
Amgen
AMGN
$198B
| $77.8M | 0.05% |
270,100
+69,900
| +35% | +$19M |
|
235
CALL
AT&T
T
$160B
| $77.4M | 0.05% |
5,181,900
-457,500
| -8% | -$7.22M |
|
236
CALL
Deere & Co
DE
$164B
| $77M | 0.05% |
192,600
+46,000
| +31% | +$17.3M |
|
|
237
CALL
Amgen
AMGN
$198B
| $76.1M | 0.05% |
264,300
+32,600
| +14% | +$8.88M |
|
238
CALL
Rivian
RIVN
$24.9B
| $74.5M | 0.05% |
3,174,000
+325,900
| +11% | +$6.13M |
|
239
PUT
Spotify
SPOT
$97.5B
| $74.1M | 0.05% |
394,200
+4,900
| +1% | +$856K |
|
240
PUT
Verizon
VZ
$185B
| $74.1M | 0.05% |
1,964,700
-698,800
| -26% | -$24.7M |
|
|
241
Walt Disney
DIS
$166B
| $73.4M | 0.05% |
+812,984
| New | +$71.7M |
|
242
CALL
Thermo Fisher Scientific
TMO
$196B
| $73.2M | 0.05% |
137,900
+57,300
| +71% | +$27.7M |
|
243
CALL
Roku
ROKU
$21.2B
| $73.2M | 0.05% |
798,500
+70,100
| +10% | +$5.86M |
|
244
CALL
Datadog
DDOG
$87.5B
| $73M | 0.05% |
601,200
-32,900
| -5% | -$3.39M |
|
245
CALL
Invesco Aerospace & Defense ETF
PPA
$8.03B
| $71.9M | 0.05% |
464,800
+257,700
| +124% | +$22M |
|
246
CALL
MongoDB
MDB
$24.5B
| $71.8M | 0.05% |
175,700
-16,000
| -8% | -$6.07M |
|
247
PUT
ConocoPhillips
COP
$145B
| $71.8M | 0.05% |
618,400
-60,900
| -9% | -$7.12M |
|
248
CALL
Lam Research
LRCX
$399B
| $70.8M | 0.05% |
904,000
-117,000
| -11% | -$7.97M |
|
249
CALL
Zscaler
ZS
$23B
| $70.7M | 0.05% |
319,200
-126,300
| -28% | -$23.4M |
|
250
CALL
Blackstone
BX
$150B
| $70.6M | 0.05% |
539,000
-163,900
| -23% | -$17.7M |
|
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.