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 | |
|---|---|---|---|---|---|---|
176
PUT
Qualcomm
QCOM
$186B
| $104M | 0.07% |
813,100
+57,800
| +8% | +$7.16M |
|
177
CALL
Lockheed Martin
LMT
$119B
| $103M | 0.07% |
227,600
+76,600
| +51% | +$33.9M |
|
|
SCHW
178
PUT
Charles Schwab
SCHW
$173B
| $103M | 0.07% |
1,492,900
-346,500
| -19% | -$20M |
|
179
PUT
Morgan Stanley
MS
$344B
| $103M | 0.07% |
1,100,600
-91,800
| -8% | -$7.34M |
|
180
CALL
McDonald's
MCD
$188B
| $102M | 0.07% |
345,300
+70,600
| +26% | +$19.2M |
|
181
CALL
Chipotle Mexican Grill
CMG
$42.1B
| $102M | 0.07% |
2,230,000
-495,000
| -18% | -$20.6M |
|
182
CALL
Texas Instruments
TXN
$269B
| $101M | 0.06% |
592,300
+95,700
| +19% | +$14.8M |
|
183
CALL
Pfizer
PFE
$142B
| $100M | 0.06% |
4,433,900
+1,531,200
| +53% | +$46.3M |
|
184
CALL
Spotify
SPOT
$98B
| $99M | 0.06% |
527,100
+182,100
| +53% | +$31.8M |
|
185
CALL
Union Pacific
UNP
$174B
| $98.7M | 0.06% |
401,800
-181,900
| -31% | -$40M |
|
186
PUT
Accenture
ACN
$86B
| $97.9M | 0.06% |
279,000
+132,300
| +90% | +$42.7M |
|
187
CALL
DraftKings
DKNG
$11.4B
| $97.5M | 0.06% |
2,765,900
+704,300
| +34% | +$23.6M |
|
188
PUT
American Express
AXP
$238B
| $96.3M | 0.06% |
514,100
+171,300
| +50% | +$27.6M |
|
189
CALL
Starbucks
SBUX
$118B
| $95.3M | 0.06% |
992,300
+6,000
| +0.6% | +$584K |
|
190
PUT
Freeport-McMoran
FCX
$93.4B
| $95.2M | 0.06% |
2,236,600
+316,800
| +17% | +$11.7M |
|
191
CALL
Super Micro Computer
SMCI
$20.6B
| $95M | 0.06% |
3,342,000
+692,000
| +26% | +$19.2M |
|
192
CALL
American Tower
AMT
$77.2B
| $93.2M | 0.06% |
431,700
-39,100
| -8% | -$7.39M |
|
193
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$252M
| $92.5M | 0.06% |
1,979,700
+342,800
| +21% | +$12M |
|
194
NVIDIA
NVDA
$5.16T
| $92.2M | 0.06% |
1,861,240
-974,100
| -34% | -$45.1M |
|
195
PUT
Affirm
AFRM
$25B
| $91.3M | 0.06% |
1,858,300
+1,190,000
| +178% | +$34.4M |
|
196
CALL
Moderna
MRNA
$23.5B
| $91.1M | 0.06% |
916,500
+15,400
| +2% | +$1.3M |
|
197
PUT
Target
TGT
$62.8B
| $90.7M | 0.06% |
636,800
-22,300
| -3% | -$2.72M |
|
198
CALL
JD.com
JD
$40.8B
| $89.3M | 0.06% |
3,091,100
-201,100
| -6% | -$5.45M |
|
199
CALL
Carnival Corporation Ltd
CCL
$36B
| $89.3M | 0.06% |
4,816,200
-590,500
| -11% | -$8.57M |
|
200
CALL
Proshares UltraShort Technology
REW
$3.27M
| $88.5M | 0.06% |
685,100
+135,812
| +25% | +$10.5M |
|
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.