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 | Miscellaneous | 98.3% |
| 2 | Technology | 0.62% |
| 3 | Communication Services | 0.22% |
| 4 | Consumer Discretionary | 0.21% |
| 5 | Healthcare | 0.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3501
Nektar Therapeutics
NKTR
$1.63B
| $412K | ﹤0.01% |
5,722
-16,214
| -74% | -$923K |
|
3502
Kennametal
KMT
$2.4B
| $412K | ﹤0.01% |
+11,392
| New | +$415K |
|
3503
PUT
Genesis Energy
GEL
$1.68B
| $410K | ﹤0.01% |
23,000
+7,900
| +52% | +$137K |
|
3504
CALL
United Natural Foods
UNFI
$2.69B
| $410K | ﹤0.01% |
9,100
-17,500
| -66% | -$670K |
|
3505
CALL
Ecopetrol
EC
$33.2B
| $409K | ﹤0.01% |
27,300
-10,800
| -28% | -$137K |
|
3506
CALL
Evertec
EVTC
$1.63B
| $409K | ﹤0.01% |
+14,500
| New | +$412K |
|
3507
PUT
Indivior Pharmaceuticals
INDV
$4.18B
| $408K | ﹤0.01% |
13,400
+5,700
| +74% | +$188K |
|
3508
CALL
Liberty Media Corporation Series A Common Stock
FWONA
$20.9B
| $408K | ﹤0.01% |
4,800
-1,200
| -20% | -$96K |
|
|
ARI
3509
CALL
Apollo Commercial Real Estate
ARI
$802M
| $408K | ﹤0.01% |
+38,600
| New | +$402K |
|
3510
iShares MSCI Poland ETF
EPOL
$803M
| $408K | ﹤0.01% |
+11,193
| New | +$410K |
|
3511
Herc Holdings
HRI
$4.27B
| $407K | ﹤0.01% |
4,093
-512
| -11% | -$73.1K |
|
3512
CALL
Cohu
COHU
$3.31B
| $407K | ﹤0.01% |
13,300
+10,900
| +454% | +$320K |
|
3513
PUT
Comstock Resources
CRK
$3.73B
| $407K | ﹤0.01% |
19,300
-113,300
| -85% | -$2.41M |
|
3514
PUT
Weatherford International
WFRD
$5.68B
| $407K | ﹤0.01% |
4,300
+2,300
| +115% | +$216K |
|
3515
CALL
Ivanhoe Electric
IE
$1.59B
| $407K | ﹤0.01% |
34,400
-23,100
| -40% | -$362K |
|
3516
PUT
MannKind Corp
MNKD
$1.26B
| $406K | ﹤0.01% |
165,800
+32,800
| +25% | +$146K |
|
3517
CALL
Broadridge
BR
$18.3B
| $406K | ﹤0.01% |
+2,500
| New | +$475K |
|
3518
CALL
CVR Partners
UAN
$1.31B
| $405K | ﹤0.01% |
3,200
+900
| +39% | +$103K |
|
3519
PUT
PAR Technology
PAR
$591M
| $405K | ﹤0.01% |
30,400
+29,400
| +2,940% | +$690K |
|
3520
PUT
Phibro Animal Health
PAHC
$1.46B
| $404K | ﹤0.01% |
7,300
-700
| -9% | -$33.3K |
|
|
INGM
3521
CALL
Ingram Micro Holding
INGM
$6.3B
| $403K | ﹤0.01% |
17,300
+16,800
| +3,360% | +$365K |
|
3522
CALL
Arch Capital
ACGL
$32.1B
| $403K | ﹤0.01% |
4,200
+3,400
| +425% | +$326K |
|
3523
CALL
Establishment Labs
ESTA
$1.89B
| $403K | ﹤0.01% |
+7,100
| New | +$485K |
|
3524
PUT
American Superconductor
AMSC
$1.43B
| $403K | ﹤0.01% |
+11,900
| New | +$376K |
|
|
VISN
3525
Vistance Networks Inc
VISN
$1.4B
| $403K | ﹤0.01% |
22,126
-80,697
| -78% | -$1.47M |
|
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's Q1 2026 filing shows 2,157 new, 2,651 increased, 3,926 reduced and 1,574 closed positions. Its largest new stake was Amazon: 764,884 shares worth $159M. The largest sale was Apple, an estimated $174M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Communication Services.
- 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 2,157 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.