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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
151
CALL
Honeywell
HON
$72.8B
| $93.9M | 0.06% |
470,660
+39,682
| +9% | +$8.03M |
|
152
PUT
AbbVie
ABBV
$452B
| $92.8M | 0.06% |
442,900
-76,700
| -15% | -$14.9M |
|
153
CALL
Merck
MRK
$312B
| $92.6M | 0.06% |
1,031,700
+410,500
| +66% | +$38.3M |
|
|
UWC
154
CALL
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $91.3M | 0.06% |
1,564,900
-1,044,800
| -40% | -$61M |
|
155
PUT
McDonald's
MCD
$188B
| $90.5M | 0.06% |
289,800
+22,500
| +8% | +$6.73M |
|
156
CALL
Arista Networks
ANET
$220B
| $90.4M | 0.06% |
1,166,400
+312,100
| +37% | +$31.6M |
|
157
CALL
Qualcomm
QCOM
$183B
| $89.3M | 0.06% |
581,200
-432,500
| -43% | -$70.5M |
|
158
PUT
ExxonMobil
XOM
$629B
| $88.1M | 0.06% |
1,176,800
-170,300
| -13% | -$18.8M |
|
159
CALL
Reddit
RDDT
$35.8B
| $87.9M | 0.06% |
837,900
-39,300
| -4% | -$6.5M |
|
160
CALL
Snowflake
SNOW
$94.2B
| $87.1M | 0.06% |
596,000
-328,500
| -36% | -$55.7M |
|
161
PUT
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $87.1M | 0.06% |
670,900
+50,300
| +8% | +$1.46M |
|
162
CALL
IBM
IBM
$198B
| $86.7M | 0.06% |
348,800
-780,600
| -69% | -$191M |
|
|
163
PUT
Merck
MRK
$312B
| $86.7M | 0.06% |
965,500
+541,900
| +128% | +$50.6M |
|
164
PUT
ServiceNow
NOW
$105B
| $86.4M | 0.06% |
607,000
+192,000
| +46% | +$37M |
|
|
165
CALL
McDonald's
MCD
$188B
| $84.8M | 0.05% |
271,400
-42,000
| -13% | -$12.6M |
|
|
166
Alphabet (Google) Class A
GOOGL
$4.24T
| $84.4M | 0.05% |
+545,647
| New | +$99M |
|
167
CALL
Intuitive Surgical
ISRG
$124B
| $84.3M | 0.05% |
170,300
+57,400
| +51% | +$31.7M |
|
168
PUT
Zscaler
ZS
$24B
| $84M | 0.05% |
423,400
+241,900
| +133% | +$48.2M |
|
169
PUT
iShares MSCI Australia ETF
EWA
$1.34B
| $83.4M | 0.05% |
2,886,500
-385,000
| -12% | -$9.35M |
|
170
PUT
Mastercard
MA
$476B
| $82.9M | 0.05% |
151,300
-30,300
| -17% | -$16.5M |
|
171
PUT
Dell
DELL
$261B
| $82.4M | 0.05% |
903,500
+8,900
| +1% | +$941K |
|
172
PUT
PayPal
PYPL
$49.3B
| $82.2M | 0.05% |
1,259,400
-791,500
| -39% | -$61.7M |
|
173
PUT
General Motors
GM
$71.7B
| $82.1M | 0.05% |
1,745,700
+280,800
| +19% | +$13.8M |
|
174
CALL
NextEra Energy
NEE
$183B
| $81.4M | 0.05% |
1,291,300
+465,500
| +56% | +$32.9M |
|
175
CALL
Invesco Aerospace & Defense ETF
PPA
$7.97B
| $80.7M | 0.05% |
481,400
+30,700
| +7% | +$3.61M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.