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 | |
|---|---|---|---|---|---|---|
1451
PUT
American Eagle Outfitters
AEO
$2.86B
| $4M | ﹤0.01% |
344,400
+189,400
| +122% | +$2.71M |
|
1452
PUT
Toast
TOST
$16.9B
| $4M | ﹤0.01% |
120,600
-40,000
| -25% | -$1.5M |
|
1453
CALL
AdaptHealth
AHCO
$1.47B
| $4M | ﹤0.01% |
368,700
+16,400
| +5% | +$165K |
|
1454
PUT
Emcor
EME
$33.7B
| $3.99M | ﹤0.01% |
10,800
+9,700
| +882% | +$4.2M |
|
1455
PUT
ZTO Express
ZTO
$18.3B
| $3.99M | ﹤0.01% |
201,100
+26,800
| +15% | +$523K |
|
|
BECN
1456
CALL
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $3.96M | ﹤0.01% |
32,000
+24,400
| +321% | +$2.84M |
|
1457
PUT
State Street
STT
$51B
| $3.96M | ﹤0.01% |
44,200
-73,800
| -63% | -$7.05M |
|
1458
PUT
SL Green Realty
SLG
$3.95B
| $3.95M | ﹤0.01% |
68,500
-176,500
| -72% | -$11.1M |
|
1459
PUT
monday.com
MNDY
$3.21B
| $3.94M | ﹤0.01% |
16,200
-14,400
| -47% | -$3.81M |
|
1460
PUT
BioMarin Pharmaceuticals
BMRN
$11.4B
| $3.93M | ﹤0.01% |
55,600
-48,800
| -47% | -$3.28M |
|
1461
Archer Aviation
ACHR
$3.78B
| $3.93M | ﹤0.01% |
552,241
+470,733
| +578% | +$4.18M |
|
|
NVMI
1462
PUT
Nova
NVMI
$14.2B
| $3.93M | ﹤0.01% |
21,300
+15,900
| +294% | +$3.67M |
|
1463
CALL
Cintas
CTAS
$82.5B
| $3.92M | ﹤0.01% |
19,100
-41,400
| -68% | -$8.25M |
|
1464
PUT
NextDecade
NEXT
$1.97B
| $3.92M | ﹤0.01% |
504,300
+305,300
| +153% | +$2.46M |
|
1465
PUT
Enovix
ENVX
$884M
| $3.92M | ﹤0.01% |
610,057
-14,172
| -2% | -$126K |
|
1466
PUT
TeraWulf
WULF
$9.78B
| $3.92M | ﹤0.01% |
1,434,100
+258,800
| +22% | +$1.15M |
|
1467
PUT
Banc of California
BANC
$3.3B
| $3.9M | ﹤0.01% |
275,000
+255,500
| +1,310% | +$3.87M |
|
|
FISV
1468
Fiserv Inc
FISV
$27.3B
| $3.9M | ﹤0.01% |
17,673
-26,736
| -60% | -$5.85M |
|
1469
CALL
Ares Management
ARES
$28.1B
| $3.9M | ﹤0.01% |
26,600
+26,000
| +4,333% | +$4.49M |
|
1470
PUT
Illumina
ILMN
$29.4B
| $3.9M | ﹤0.01% |
50,300
-10,100
| -17% | -$1.09M |
|
1471
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$21.4B
| $3.9M | ﹤0.01% |
+39,460
| New | +$4.28M |
|
|
SKX
1472
PUT
DELISTED
Skechers
SKX
| $3.89M | ﹤0.01% |
68,500
+3,400
| +5% | +$221K |
|
1473
Advance Auto Parts
AAP
$3.26B
| $3.89M | ﹤0.01% |
99,151
+27,360
| +38% | +$1.17M |
|
1474
IBM
IBM
$202B
| $3.88M | ﹤0.01% |
+15,625
| New | +$3.82M |
|
1475
PUT
Harley-Davidson
HOG
$2.74B
| $3.88M | ﹤0.01% |
153,800
+60,100
| +64% | +$1.61M |
|
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.