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 | |
|---|---|---|---|---|---|---|
3551
CALL
Cracker Barrel
CBRL
$1.26B
| $394K | ﹤0.01% |
+14,000
| New | +$426K |
|
3552
CALL
Urban Outfitters
URBN
$6.39B
| $393K | ﹤0.01% |
6,200
-11,500
| -65% | -$789K |
|
3553
CALL
Clearway Energy Class C
CWEN
$4.95B
| $392K | ﹤0.01% |
10,000
-400
| -4% | -$14.9K |
|
3554
PUT
Macerich
MAC
$7.28B
| $391K | ﹤0.01% |
+20,700
| New | +$392K |
|
|
DDL
3555
CALL
Dingdong
DDL
$560M
| $391K | ﹤0.01% |
152,200
-127,500
| -46% | -$354K |
|
|
WLTH
3556
CALL
Wealthfront Corp
WLTH
$1.41B
| $390K | ﹤0.01% |
+42,200
| New | +$386K |
|
3557
PUT
Universal Corp
UVV
$1.31B
| $390K | ﹤0.01% |
7,400
+6,600
| +825% | +$355K |
|
3558
CALL
Microvast
MVST
$273M
| $389K | ﹤0.01% |
259,600
-22,100
| -8% | -$53.2K |
|
3559
Mid-America Apartment Communities
MAA
$15.5B
| $388K | ﹤0.01% |
+3,178
| New | +$419K |
|
|
CUK
3560
PUT
DELISTED
Carnival PLC
CUK
| $387K | ﹤0.01% |
+15,000
| New | +$435K |
|
|
ORBS
3561
CALL
Eightco Holdings
ORBS
$232M
| $386K | ﹤0.01% |
414,100
+205,400
| +98% | +$263K |
|
3562
Under Armour Class C
UA
$2.79B
| $385K | ﹤0.01% |
66,547
-29,852
| -31% | -$188K |
|
3563
Kiniksa Pharmaceuticals
KNSA
$5.87B
| $385K | ﹤0.01% |
+8,002
| New | +$354K |
|
3564
CALL
World Kinect Corp
WKC
$2.03B
| $385K | ﹤0.01% |
16,700
+6,400
| +62% | +$162K |
|
|
ONIT
3565
PUT
Onity Group
ONIT
$308M
| $385K | ﹤0.01% |
9,800
+4,900
| +100% | +$213K |
|
3566
PUT
Ironwood Pharmaceuticals
IRWD
$698M
| $385K | ﹤0.01% |
+109,600
| New | +$449K |
|
3567
CALL
Pool Corp
POOL
$6.74B
| $384K | ﹤0.01% |
1,900
-9,000
| -83% | -$2.12M |
|
3568
PUT
Cogent Communications
CCOI
$658M
| $384K | ﹤0.01% |
20,400
+14,900
| +271% | +$328K |
|
3569
CALL
Medpace
MEDP
$16.1B
| $384K | ﹤0.01% |
800
+700
| +700% | +$358K |
|
3570
PUT
Chord Energy
CHRD
$7.87B
| $384K | ﹤0.01% |
2,700
| – | – |
|
|
AL
3571
PUT
DELISTED
Air Lease Corp
AL
| $383K | ﹤0.01% |
5,900
+3,400
| +136% | +$220K |
|
3572
PUT
OneWater Marine
ONEW
$203M
| $383K | ﹤0.01% |
+40,500
| New | +$473K |
|
3573
CALL
Procept Biorobotics
PRCT
$1.04B
| $383K | ﹤0.01% |
15,300
+7,300
| +91% | +$206K |
|
|
DFDV
3574
DeFi Development Corp
DFDV
$76.5M
| $382K | ﹤0.01% |
+116,102
| New | +$559K |
|
3575
CALL
JB Hunt Transport Services
JBHT
$25.6B
| $381K | ﹤0.01% |
1,800
-5,200
| -74% | -$1.11M |
|
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.