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 |
Netflix
NFLX
|
+$73.1M |
| 2 |
Western Digital
WDC
|
+$51.8M |
| 3 |
iShares Semiconductor ETF
SOXX
|
+$46M |
| 4 |
Meta Platforms (Facebook)
META
|
+$41.8M |
| 5 |
Alibaba
BABA
|
+$37.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$262M |
| 2 |
Microsoft
MSFT
|
+$194M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$149M |
| 4 |
Apple
AAPL
|
+$119M |
| 5 |
Amazon
AMZN
|
+$107M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.59% |
| 2 | Consumer Discretionary | 0.21% |
| 3 | Healthcare | 0.2% |
| 4 | Industrials | 0.18% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1451
CALL
ADMA Biologics
ADMA
$1.92B
| $4.03M | ﹤0.01% |
220,900
+87,000
| +65% | +$1.47M |
|
1452
CALL
Powell Industries
POWL
$8.46B
| $4.02M | ﹤0.01% |
37,800
-7,800
| -17% | -$876K |
|
1453
PUT
Alaska Air
ALK
$5.15B
| $4.01M | ﹤0.01% |
79,800
-30,600
| -28% | -$1.41M |
|
|
KNGS
1454
CALL
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $4.01M | ﹤0.01% |
122,700
+46,700
| +61% | +$1.53M |
|
1455
PUT
First Horizon
FHN
$12.1B
| $4.01M | ﹤0.01% |
167,600
-3,700
| -2% | -$82.5K |
|
1456
Hilton Worldwide
HLT
$74B
| $4M | ﹤0.01% |
13,926
-803
| -5% | -$219K |
|
1457
CALL
Amcor
AMCR
$20.6B
| $4M | ﹤0.01% |
95,920
+39,040
| +69% | +$1.61M |
|
1458
Target
TGT
$62.1B
| $4M | ﹤0.01% |
40,901
-341,038
| -89% | -$31.4M |
|
1459
PUT
Lincoln National
LNC
$7.91B
| $3.99M | ﹤0.01% |
89,600
+8,600
| +11% | +$358K |
|
|
USAR
1460
PUT
USA Rare Earth Inc
USAR
$3.46B
| $3.98M | ﹤0.01% |
334,800
-235,400
| -41% | -$4.48M |
|
1461
PUT
Whirlpool
WHR
$2.42B
| $3.98M | ﹤0.01% |
55,200
-31,900
| -37% | -$2.36M |
|
1462
CALL
JetBlue
JBLU
$1.96B
| $3.98M | ﹤0.01% |
874,600
+405,400
| +86% | +$1.85M |
|
1463
PUT
Oneok
OKE
$58.7B
| $3.97M | ﹤0.01% |
54,000
-34,600
| -39% | -$2.45M |
|
1464
CALL
Ametek
AME
$55.5B
| $3.96M | ﹤0.01% |
19,300
+12,400
| +180% | +$2.41M |
|
|
HAPN
1465
CALL
Happen Inc
HAPN
$2.08B
| $3.96M | ﹤0.01% |
209,200
+35,100
| +20% | +$620K |
|
1466
CALL
monday.com
MNDY
$3.27B
| $3.95M | ﹤0.01% |
26,800
-6,800
| -20% | -$1.15M |
|
1467
PUT
Idacorp
IDA
$8.23B
| $3.95M | ﹤0.01% |
31,200
+14,600
| +88% | +$1.9M |
|
1468
Sphere Entertainment
SPHR
$4.88B
| $3.93M | ﹤0.01% |
41,355
+10,936
| +36% | +$833K |
|
1469
CALL
Yum China
YUMC
$14.9B
| $3.91M | ﹤0.01% |
82,000
-29,000
| -26% | -$1.33M |
|
|
TYNS
1470
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $3.91M | ﹤0.01% |
23,700
-1,600
| -6% | -$264K |
|
1471
CALL
Trip.com Group
TCOM
$27.5B
| $3.9M | ﹤0.01% |
54,300
-21,000
| -28% | -$1.5M |
|
1472
CALL
SL Green Realty
SLG
$3.88B
| $3.9M | ﹤0.01% |
85,000
-29,000
| -25% | -$1.43M |
|
1473
ProShares UltraShort Gold
GLL
$128M
| $3.9M | ﹤0.01% |
149,072
+146,882
| +6,707% | +$4.18M |
|
1474
B2Gold
BTG
$5.16B
| $3.88M | ﹤0.01% |
861,072
+412,128
| +92% | +$1.92M |
|
1475
Sprott Uranium Miners ETF
URNM
$1.78B
| $3.88M | ﹤0.01% |
+70,746
| New | +$4.09M |
|
Similar funds
Simplex Trading's Q4 2025 Portfolio in Review
As of Q4 2025, Simplex Trading held 10,526 positions worth $177B, down 9% from $195B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading withdrew a net $23.2B in Q4 2025, closing 2,184 positions and reducing 4,088 holdings. Its most notable exit was iShares Russell 2000 ETF, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.59% of assets, down from 0.79% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Western Digital worth $58.9M.
- Simplex Trading's largest Q4 2025 buy was Western Digital: 341,762 shares worth $58.9M.
- Simplex Trading added most to Netflix in Q4 2025, an estimated $73.1M increase.
- Simplex Trading's biggest Q4 2025 reduction was NVIDIA, cutting an estimated $262M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2025, selling an estimated $149M.
- Simplex Trading's ten largest holdings make up 49% of its $177B portfolio in Q4 2025.
- Simplex Trading opened 1,476 new positions and closed 2,184 in Q4 2025.
- Simplex Trading's portfolio value fell 9% quarter-over-quarter to $177B.
Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.