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 | |
|---|---|---|---|---|---|---|
3526
PUT
Scholastic
SCHL
$767M
| $402K | ﹤0.01% |
10,300
+5,500
| +115% | +$190K |
|
3527
CALL
Lantheus
LNTH
$6.51B
| $402K | ﹤0.01% |
5,300
-3,100
| -37% | -$223K |
|
3528
Groupon
GRPN
$1.06B
| $402K | ﹤0.01% |
+33,780
| New | +$451K |
|
3529
CALL
Alliant Energy
LNT
$18.2B
| $402K | ﹤0.01% |
5,600
+2,200
| +65% | +$152K |
|
3530
Affiliated Managers Group
AMG
$9.82B
| $401K | ﹤0.01% |
+1,451
| New | +$437K |
|
|
SLDE
3531
CALL
Slide Insurance Holdings
SLDE
$2.33B
| $401K | ﹤0.01% |
22,300
-29,600
| -57% | -$518K |
|
3532
PUT
Seanergy Maritime Holdings
SHIP
$381M
| $400K | ﹤0.01% |
+31,000
| New | +$364K |
|
3533
PUT
Ameriprise Financial
AMP
$48.4B
| $400K | ﹤0.01% |
900
+700
| +350% | +$337K |
|
3534
CALL
Monte Rosa Therapeutics
GLUE
$1.35B
| $400K | ﹤0.01% |
24,300
+23,000
| +1,769% | +$440K |
|
3535
CALL
Exelixis
EXEL
$13.4B
| $399K | ﹤0.01% |
9,300
-60,900
| -87% | -$2.62M |
|
3536
CALL
Microvision
MVIS
$90.3M
| $398K | ﹤0.01% |
620,900
-438,300
| -41% | -$334K |
|
3537
CBRE Group
CBRE
$42.2B
| $398K | ﹤0.01% |
+2,937
| New | +$446K |
|
3538
Dick's Sporting Goods
DKS
$17.6B
| $398K | ﹤0.01% |
2,006
-13,347
| -87% | -$2.71M |
|
3539
PUT
Vipshop
VIPS
$7.35B
| $398K | ﹤0.01% |
25,300
-104,300
| -80% | -$1.77M |
|
3540
Biogen
BIIB
$30.4B
| $397K | ﹤0.01% |
2,164
-28,714
| -93% | -$5.29M |
|
3541
PUT
Pitney Bowes
PBI
$2.36B
| $397K | ﹤0.01% |
35,900
-126,200
| -78% | -$1.32M |
|
3542
STMicroelectronics
STM
$47.4B
| $397K | ﹤0.01% |
+11,479
| New | +$359K |
|
3543
Medtronic
MDT
$110B
| $396K | ﹤0.01% |
4,575
+3,844
| +526% | +$368K |
|
3544
Omeros
OMER
$854M
| $396K | ﹤0.01% |
37,526
-86,453
| -70% | -$1.02M |
|
3545
PUT
Crinetics Pharmaceuticals
CRNX
$8.85B
| $396K | ﹤0.01% |
+10,900
| New | +$487K |
|
3546
VanEck Agribusiness ETF
MOO
$976M
| $396K | ﹤0.01% |
+4,683
| New | +$382K |
|
|
JHG
3547
CALL
DELISTED
Janus Henderson
JHG
| $396K | ﹤0.01% |
7,700
-9,700
| -56% | -$480K |
|
3548
CALL
Keros Therapeutics
KROS
$196M
| $395K | ﹤0.01% |
35,800
+23,600
| +193% | +$364K |
|
3549
PUT
Boot Barn
BOOT
$4.58B
| $395K | ﹤0.01% |
2,700
-5,200
| -66% | -$943K |
|
3550
CALL
National Fuel Gas
NFG
$7.79B
| $395K | ﹤0.01% |
4,200
-4,100
| -49% | -$358K |
|
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.