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 | |
|---|---|---|---|---|---|---|
7651
CALL
Castor Maritime
CTRM
$18.7M
| $7.03K | ﹤0.01% |
3,800
+1,500
| +65% | +$3.2K |
|
7652
PUT
Blink Charging
BLNK
$79.6M
| $7.03K | ﹤0.01% |
12,400
-24,900
| -67% | -$17.5K |
|
7653
CALL
Kontoor Brands
KTB
$4.79B
| $7.03K | ﹤0.01% |
100
-100
| -50% | -$6.55K |
|
7654
PUT
Stratasys
SSYS
$708M
| $7.03K | ﹤0.01% |
900
-15,000
| -94% | -$147K |
|
7655
PUT
BJ's Restaurants
BJRI
$1.41B
| $7.02K | ﹤0.01% |
200
-200
| -50% | -$8K |
|
7656
CALL
Tarsus Pharmaceuticals
TARS
$2.5B
| $7.01K | ﹤0.01% |
+100
| New | +$6.99K |
|
|
PLYY
7657
GraniteShares YieldBOOST PLTR ETF
PLYY
$2.89M
| $7.01K | ﹤0.01% |
565
-131
| -19% | -$1.94K |
|
7658
CALL
Compass Minerals
CMP
$1.26B
| $7K | ﹤0.01% |
300
-100
| -25% | -$2.35K |
|
|
7659
PUT
Compass Minerals
CMP
$1.26B
| $7K | ﹤0.01% |
300
+200
| +200% | +$4.71K |
|
7660
CALL
Wipro
WIT
$18B
| $7K | ﹤0.01% |
3,300
+3,200
| +3,200% | +$7.8K |
|
7661
Dorman Products
DORM
$4.02B
| $6.99K | ﹤0.01% |
+67
| New | +$7.98K |
|
|
DCBO
7662
CALL
Docebo
DCBO
$496M
| $6.99K | ﹤0.01% |
400
-1,000
| -71% | -$19.1K |
|
7663
Data I/O
DAIO
$32.7M
| $6.98K | ﹤0.01% |
2,759
+827
| +43% | +$2.41K |
|
7664
PUT
Autohome
ATHM
$2.48B
| $6.95K | ﹤0.01% |
+400
| New | +$8.22K |
|
7665
OFS Capital
OFS
$46.1M
| $6.93K | ﹤0.01% |
1,951
+1,811
| +1,294% | +$7.59K |
|
7666
CalciMedica
CALC
$11.6M
| $6.92K | ﹤0.01% |
+12,816
| New | +$26K |
|
7667
PUT
Travel + Leisure Co
TNL
$4.7B
| $6.92K | ﹤0.01% |
+100
| New | +$7.21K |
|
7668
Frequency Electronics
FEIM
$710M
| $6.9K | ﹤0.01% |
156
-80
| -34% | -$4.08K |
|
7669
Prenetics Global
PRE
$374M
| $6.88K | ﹤0.01% |
+356
| New | +$6.63K |
|
7670
ProShares Ultra Health Care
RXL
$81.2M
| $6.88K | ﹤0.01% |
+150
| New | +$7.66K |
|
7671
PUT
Sonic Automotive
SAH
$3.16B
| $6.86K | ﹤0.01% |
+100
| New | +$6.24K |
|
|
NOTV
7672
DELISTED
Inotiv
NOTV
| $6.84K | ﹤0.01% |
25,074
+20,690
| +472% | +$8.52K |
|
7673
Gencor Industries
GENC
$224M
| $6.84K | ﹤0.01% |
456
+192
| +73% | +$2.8K |
|
7674
PUT
TETRA Technologies
TTI
$1.34B
| $6.82K | ﹤0.01% |
800
-99,500
| -99% | -$997K |
|
7675
PUT
XBiotech
XBIT
$70.1M
| $6.82K | ﹤0.01% |
2,900
+1,600
| +123% | +$3.87K |
|
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.