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 | |
|---|---|---|---|---|---|---|
151
PUT
FedEx
FDX
$76.2B
| $118M | 0.08% |
466,500
+78,300
| +20% | +$19.9M |
|
|
152
Alphabet (Google) Class A
GOOGL
$4.25T
| $117M | 0.08% |
839,689
+698,693
| +496% | +$93.9M |
|
153
PUT
Wells Fargo
WFC
$263B
| $117M | 0.07% |
2,369,500
+487,200
| +26% | +$21M |
|
|
SCHW
154
CALL
Charles Schwab
SCHW
$174B
| $117M | 0.07% |
1,693,600
-626,100
| -27% | -$36.2M |
|
155
PUT
Lockheed Martin
LMT
$119B
| $116M | 0.07% |
256,300
+94,400
| +58% | +$41.8M |
|
156
CALL
Oracle
ORCL
$365B
| $115M | 0.07% |
1,086,400
-515,100
| -32% | -$56.2M |
|
157
PUT
Vanguard S&P 500 ETF
VOO
$979B
| $114M | 0.07% |
400,200
-66,500
| -14% | -$27.2M |
|
158
CALL
CrowdStrike
CRWD
$191B
| $114M | 0.07% |
1,786,400
-322,400
| -15% | -$16.9M |
|
159
PUT
Albemarle
ALB
$14.3B
| $112M | 0.07% |
777,400
+390,700
| +101% | +$53.6M |
|
160
PUT
Cisco
CSCO
$445B
| $112M | 0.07% |
2,215,000
-135,500
| -6% | -$6.92M |
|
|
KFYP
161
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $111M | 0.07% |
4,118,000
+777,400
| +23% | +$17.4M |
|
162
CALL
Carvana
CVNA
$45.3B
| $111M | 0.07% |
10,488,000
+3,258,500
| +45% | +$24.4M |
|
163
CALL
Enphase Energy
ENPH
$5.29B
| $111M | 0.07% |
838,000
+330,400
| +65% | +$35M |
|
164
PUT
Intuit
INTU
$78.9B
| $109M | 0.07% |
175,000
+59,500
| +52% | +$32.8M |
|
165
CALL
Marathon Digital Holdings
MARA
$4.76B
| $109M | 0.07% |
4,656,400
+1,948,800
| +72% | +$24.6M |
|
166
PUT
Intuitive Surgical
ISRG
$123B
| $109M | 0.07% |
323,900
+110,200
| +52% | +$32.8M |
|
167
CALL
Johnson & Johnson
JNJ
$613B
| $109M | 0.07% |
695,400
-248,900
| -26% | -$38.2M |
|
|
168
PUT
Johnson & Johnson
JNJ
$613B
| $108M | 0.07% |
689,300
-295,300
| -30% | -$45.3M |
|
169
PUT
RTX Corp
RTX
$263B
| $108M | 0.07% |
1,282,100
+741,100
| +137% | +$58.7M |
|
|
170
CALL
Vanguard S&P 500 ETF
VOO
$979B
| $108M | 0.07% |
430,800
+109,800
| +34% | +$45M |
|
|
UWC
171
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $107M | 0.07% |
2,100,900
+241,500
| +13% | +$12.3M |
|
172
CALL
Unity
U
$12.7B
| $105M | 0.07% |
2,570,700
+912,700
| +55% | +$28.1M |
|
173
PUT
Super Micro Computer
SMCI
$20.3B
| $105M | 0.07% |
3,690,000
-164,000
| -4% | -$4.55M |
|
174
PUT
General Motors
GM
$74.1B
| $105M | 0.07% |
2,912,600
+476,400
| +20% | +$14.7M |
|
175
PUT
MongoDB
MDB
$24.1B
| $104M | 0.07% |
255,200
+52,100
| +26% | +$19.8M |
|
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.