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 | |
|---|---|---|---|---|---|---|
826
CALL
Steel Dynamics
STLD
$34.8B
| $11.2M | 0.01% |
89,300
+15,400
| +21% | +$1.95M |
|
827
PUT
Darden Restaurants
DRI
$22.2B
| $11.2M | 0.01% |
53,700
-61,500
| -53% | -$11.9M |
|
828
CALL
CRH
CRH
$65.9B
| $11.2M | 0.01% |
126,800
-27,000
| -18% | -$2.66M |
|
829
CALL
Check Point Software Technologies
CHKP
$13.1B
| $11.1M | 0.01% |
48,900
-4,100
| -8% | -$869K |
|
830
CALL
Bloom Energy
BE
$63B
| $11.1M | 0.01% |
564,900
-248,300
| -31% | -$5.93M |
|
831
CALL
Synopsys
SNPS
$71.7B
| $11.1M | 0.01% |
25,800
-22,700
| -47% | -$11M |
|
|
TIGR
832
CALL
UP Fintech Holding
TIGR
$868M
| $11.1M | 0.01% |
1,288,000
-27,100
| -2% | -$202K |
|
833
PUT
Five Below
FIVE
$11.3B
| $11M | 0.01% |
147,300
-20,700
| -12% | -$1.82M |
|
834
PUT
NIO
NIO
$11.6B
| $11M | 0.01% |
2,896,800
-1,139,600
| -28% | -$5.02M |
|
835
CALL
Maplebear
CART
$10B
| $10.9M | 0.01% |
273,900
+13,700
| +5% | +$609K |
|
836
CALL
GitLab
GTLB
$5.09B
| $10.9M | 0.01% |
232,000
+1,600
| +0.7% | +$97.9K |
|
837
CALL
AMC Entertainment Holdings
AMC
$1.92B
| $10.9M | 0.01% |
3,797,000
-1,143,400
| -23% | -$3.75M |
|
838
CALL
SoundHound AI
SOUN
$2.76B
| $10.9M | 0.01% |
1,338,800
-556,300
| -29% | -$6.93M |
|
839
SLB Ltd
SLB
$72.1B
| $10.9M | 0.01% |
260,039
-2,053
| -0.8% | -$84.1K |
|
840
CALL
Expedia Group
EXPE
$30.4B
| $10.9M | 0.01% |
64,600
-60,600
| -48% | -$11M |
|
841
CALL
Astera Labs
ALAB
$56.2B
| $10.8M | 0.01% |
181,800
-151,600
| -45% | -$14M |
|
842
PUT
Atmos Energy
ATO
$29.9B
| $10.8M | 0.01% |
70,100
+700
| +1% | +$102K |
|
843
PUT
Lamb Weston
LW
$6.63B
| $10.8M | 0.01% |
203,200
-122,200
| -38% | -$6.92M |
|
844
PUT
e.l.f. Beauty
ELF
$4.51B
| $10.8M | 0.01% |
172,300
-154,000
| -47% | -$13.4M |
|
845
CALL
CF Industries
CF
$19.8B
| $10.8M | 0.01% |
138,400
-68,500
| -33% | -$5.75M |
|
846
PUT
VeriSign
VRSN
$23.8B
| $10.8M | 0.01% |
42,600
+34,300
| +413% | +$7.79M |
|
847
CALL
GoDaddy
GDDY
$11.6B
| $10.8M | 0.01% |
59,900
-101,500
| -63% | -$19.4M |
|
848
CALL
Canadian Imperial Bank of Commerce
CM
$107B
| $10.8M | 0.01% |
191,200
+81,800
| +75% | +$4.94M |
|
849
CALL
NXP Semiconductors
NXPI
$69.3B
| $10.7M | 0.01% |
56,500
-46,700
| -45% | -$9.96M |
|
850
PUT
Wingstop
WING
$3.68B
| $10.7M | 0.01% |
47,600
+500
| +1% | +$130K |
|
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.