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 |
Amazon
AMZN
|
+$168M |
| 2 |
NVIDIA
NVDA
|
+$141M |
| 3 |
TSMC
TSM
|
+$121M |
| 4 |
Meta Platforms (Facebook)
META
|
+$107M |
| 5 |
SPDR Gold Trust
GLD
|
+$103M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$174M |
| 2 |
Western Digital
WDC
|
+$87.7M |
| 3 |
Broadcom
AVGO
|
+$62.2M |
| 4 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$52M |
| 5 |
Netflix
NFLX
|
+$44.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.62% |
| 2 | Communication Services | 0.22% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Healthcare | 0.2% |
| 5 | Industrials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
376
CALL
Capital One
COF
$123B
| $24.2M | 0.02% |
132,400
-66,800
| -34% | -$14M |
|
377
CALL
Kinder Morgan
KMI
$72.9B
| $24.1M | 0.02% |
719,500
+133,100
| +23% | +$4.16M |
|
378
CALL
W.W. Grainger
GWW
$64.6B
| $24.1M | 0.02% |
22,100
-4,400
| -17% | -$4.81M |
|
379
PUT
Vale
VALE
$63.1B
| $24M | 0.02% |
1,506,400
-319,700
| -18% | -$4.99M |
|
380
PUT
Arista Networks
ANET
$222B
| $23.9M | 0.02% |
194,500
-294,700
| -60% | -$39.4M |
|
381
CALL
Chipotle Mexican Grill
CMG
$41.1B
| $23.8M | 0.02% |
743,100
-1,105,700
| -60% | -$40.9M |
|
|
SCHW
382
CALL
Charles Schwab
SCHW
$177B
| $23.7M | 0.02% |
252,300
-113,400
| -31% | -$11.1M |
|
383
CALL
MongoDB
MDB
$24.1B
| $23.6M | 0.02% |
96,400
-127,200
| -57% | -$42.5M |
|
384
CALL
Roblox
RBLX
$34B
| $23.6M | 0.02% |
417,000
-136,500
| -25% | -$9.17M |
|
|
TEM
385
CALL
Tempus AI
TEM
$8.28B
| $23.5M | 0.02% |
520,400
-143,100
| -22% | -$8.13M |
|
386
CALL
Trade Desk
TTD
$7.89B
| $23.4M | 0.02% |
1,030,000
-515,800
| -33% | -$14.9M |
|
387
CALL
Intuit
INTU
$77B
| $23.3M | 0.02% |
53,900
-1,100
| -2% | -$525K |
|
|
388
PUT
Chipotle Mexican Grill
CMG
$41.1B
| $23M | 0.02% |
718,900
-643,900
| -47% | -$23.8M |
|
389
CALL
Honeywell
HON
$78B
| $23M | 0.02% |
151,800
-33,200
| -18% | -$7.59M |
|
390
PUT
Altria Group
MO
$120B
| $23M | 0.02% |
348,300
-181,800
| -34% | -$11.7M |
|
391
CALL
Accenture
ACN
$84.9B
| $22.8M | 0.02% |
115,200
-115,400
| -50% | -$26.9M |
|
392
Global X Uranium ETF
URA
$5.69B
| $22.8M | 0.02% |
+470,104
| New | +$24.5M |
|
393
CALL
Marathon Digital Holdings
MARA
$4.87B
| $22.7M | 0.02% |
2,785,400
-2,841,500
| -50% | -$25.7M |
|
394
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$34.7B
| $22.7M | 0.02% |
+208,171
| New | +$23M |
|
395
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$423M
| $22.7M | 0.02% |
518,650
+372,650
| +255% | +$14.9M |
|
396
CALL
Warner Bros
WBD
$65.1B
| $22.4M | 0.02% |
816,900
-2,417,100
| -75% | -$67.7M |
|
397
CALL
Snap
SNAP
$7.42B
| $22.4M | 0.02% |
4,871,900
+953,400
| +24% | +$5.62M |
|
|
BMNR
398
PUT
BitMine Immersion Technologies
BMNR
$10B
| $22.3M | 0.02% |
+1,127,500
| New | +$26.6M |
|
399
PUT
Thermo Fisher Scientific
TMO
$213B
| $22.2M | 0.01% |
+45,200
| New | +$24.5M |
|
400
ASML
ASML
$693B
| $22.1M | 0.01% |
+16,741
| New | +$22.9M |
|
Similar funds
Simplex Trading's Q1 2026 Portfolio in Review
As of Q1 2026, Simplex Trading held 10,500 positions worth $149B, down 16% from $177B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $18.1B in Q1 2026, closing 1,574 positions and reducing 3,926 holdings. Its most notable exit was Direxion Daily Semiconductor Bull 3X ETF, an estimated $52M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.62% of assets, up from 0.59% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in Amazon worth $159M.
- Simplex Trading's largest Q1 2026 buy was Amazon: 764,884 shares worth $159M.
- Simplex Trading added most to NVIDIA in Q1 2026, an estimated $141M increase.
- Simplex Trading's biggest Q1 2026 reduction was Apple, cutting an estimated $174M.
- Simplex Trading fully exited Direxion Daily Semiconductor Bull 3X ETF in Q1 2026, selling an estimated $52M.
- Simplex Trading's ten largest holdings make up 51% of its $149B portfolio in Q1 2026.
- Simplex Trading opened 2,156 new positions and closed 1,574 in Q1 2026.
- Simplex Trading's portfolio value fell 16% quarter-over-quarter to $149B.
Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.