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 | |
|---|---|---|---|---|---|---|
451
PUT
Autodesk
ADSK
$43B
| $25M | 0.02% |
95,500
-119,500
| -56% | -$34M |
|
452
PUT
Abbott
ABT
$175B
| $25M | 0.02% |
188,400
+39,000
| +26% | +$4.96M |
|
453
PUT
Medtronic
MDT
$105B
| $25M | 0.02% |
278,000
+93,800
| +51% | +$8.39M |
|
454
CALL
Kroger
KR
$35.3B
| $24.9M | 0.02% |
367,500
-165,000
| -31% | -$10.5M |
|
455
CALL
KKR & Co
KKR
$85.8B
| $24.7M | 0.02% |
213,300
+21,800
| +11% | +$3M |
|
456
PUT
Energy Transfer Partners
ET
$70.1B
| $24.5M | 0.02% |
1,318,700
+114,000
| +9% | +$2.22M |
|
457
PUT
Roku
ROKU
$21.2B
| $24.4M | 0.02% |
346,100
-473,100
| -58% | -$37.9M |
|
458
CALL
Emerson Electric
EMR
$78.2B
| $24.2M | 0.02% |
220,500
+75,000
| +52% | +$9.04M |
|
459
PUT
Cameco
CCJ
$39.4B
| $24.1M | 0.02% |
584,600
-170,600
| -23% | -$8.03M |
|
|
B
460
Barrick Mining
B
$62.8B
| $24M | 0.02% |
1,235,654
-582,333
| -32% | -$10.2M |
|
461
CALL
Celestica
CLS
$38.6B
| $24M | 0.02% |
304,700
+43,100
| +16% | +$4.57M |
|
462
CALL
Seagate
STX
$205B
| $23.9M | 0.02% |
281,300
+187,800
| +201% | +$17.7M |
|
463
PUT
Fortinet
FTNT
$114B
| $23.9M | 0.02% |
247,900
-365,300
| -60% | -$37M |
|
464
CALL
On Holding
ONON
$12.2B
| $23.8M | 0.02% |
541,800
-242,300
| -31% | -$12.7M |
|
|
465
CALL
Fortinet
FTNT
$114B
| $23.7M | 0.02% |
246,600
-56,200
| -19% | -$5.7M |
|
466
PUT
Thermo Fisher Scientific
TMO
$196B
| $23.7M | 0.02% |
47,700
+1,000
| +2% | +$542K |
|
|
467
CALL
Thermo Fisher Scientific
TMO
$196B
| $23.7M | 0.02% |
47,600
-10,000
| -17% | -$5.42M |
|
468
PUT
Vale
VALE
$63.2B
| $23.7M | 0.02% |
2,371,000
-637,000
| -21% | -$6.02M |
|
469
PUT
Wynn Resorts
WYNN
$9.79B
| $23.6M | 0.02% |
282,300
-60,400
| -18% | -$5.15M |
|
470
iShares Bitcoin Trust
IBIT
$48.4B
| $23.5M | 0.02% |
+503,019
| New | +$26.6M |
|
471
PUT
Okta
OKTA
$23.8B
| $23.4M | 0.02% |
222,400
-12,600
| -5% | -$1.23M |
|
472
PUT
Futu Holdings
FUTU
$14.9B
| $23.4M | 0.02% |
228,600
-12,600
| -5% | -$1.29M |
|
473
CALL
Southern Company
SO
$108B
| $23.3M | 0.01% |
253,900
-105,900
| -29% | -$9.17M |
|
474
Dell
DELL
$285B
| $23.1M | 0.01% |
253,933
+151,761
| +149% | +$16.1M |
|
|
MPT
475
PUT
Medical Properties Trust
MPT
$2.88B
| $23.1M | 0.01% |
3,837,600
+163,100
| +4% | +$825K |
|
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.