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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2826
PUT
Skywest
SKYW
$4.11B
| $1.24M | ﹤0.01% |
12,300
+2,200
| +22% | +$246K |
|
2827
Cirrus Logic
CRUS
$6.74B
| $1.24M | ﹤0.01% |
+9,869
| New | +$1.1M |
|
2828
PPG Industries
PPG
$25.9B
| $1.24M | ﹤0.01% |
11,763
-9,169
| -44% | -$1.02M |
|
2829
CALL
Renasant Corp
RNST
$4.01B
| $1.24M | ﹤0.01% |
33,500
+20,300
| +154% | +$768K |
|
2830
Noble Corp
NE
$6.9B
| $1.23M | ﹤0.01% |
43,658
-25,485
| -37% | -$722K |
|
|
FETH
2831
PUT
Fidelity Ethereum Fund
FETH
$1B
| $1.23M | ﹤0.01% |
29,700
+23,200
| +357% | +$909K |
|
2832
PUT
CorMedix
CRMD
$617M
| $1.23M | ﹤0.01% |
105,900
+82,300
| +349% | +$995K |
|
2833
PUT
Capricor Therapeutics
CAPR
$1.14B
| $1.23M | ﹤0.01% |
170,400
-176,400
| -51% | -$1.3M |
|
2834
PUT
Crescent Energy
CRGY
$3.72B
| $1.23M | ﹤0.01% |
137,700
+70,800
| +106% | +$643K |
|
2835
CALL
DHT Holdings
DHT
$2.97B
| $1.23M | ﹤0.01% |
102,800
-31,900
| -24% | -$370K |
|
2836
PUT
Healthcare Realty
HR
$7.42B
| $1.23M | ﹤0.01% |
68,100
-500
| -0.7% | -$8.46K |
|
2837
Sibanye-Stillwater
SBSW
$5.92B
| $1.22M | ﹤0.01% |
+108,938
| New | +$951K |
|
2838
Travere Therapeutics
TVTX
$5.33B
| $1.22M | ﹤0.01% |
+51,241
| New | +$963K |
|
2839
PUT
Freedom Holding
FRHC
$9.61B
| $1.22M | ﹤0.01% |
7,100
+2,100
| +42% | +$354K |
|
2840
CALL
Sturm, Ruger & Co
RGR
$610M
| $1.22M | ﹤0.01% |
28,100
+23,300
| +485% | +$840K |
|
2841
CALL
GoPro
GPRO
$116M
| $1.22M | ﹤0.01% |
575,700
+496,400
| +626% | +$738K |
|
2842
Imperial Petroleum
IMPP
$215M
| $1.22M | ﹤0.01% |
+255,273
| New | +$898K |
|
|
APLS
2843
DELISTED
Apellis Pharmaceuticals
APLS
| $1.22M | ﹤0.01% |
53,901
-2,033
| -4% | -$47.4K |
|
2844
CALL
Idaho Strategic Resources
IDR
$449M
| $1.22M | ﹤0.01% |
36,100
-7,700
| -18% | -$182K |
|
|
VOYG
2845
PUT
Voyager Technologies
VOYG
$1.5B
| $1.22M | ﹤0.01% |
40,900
+31,100
| +317% | +$1.08M |
|
2846
RUM Group Inc
RUM
$1.57B
| $1.22M | ﹤0.01% |
168,214
+24,683
| +17% | +$202K |
|
2847
CALL
Tenaris
TS
$29.1B
| $1.22M | ﹤0.01% |
34,000
+14,200
| +72% | +$516K |
|
2848
PUT
Forward Air
FWRD
$482M
| $1.22M | ﹤0.01% |
47,400
+13,000
| +38% | +$374K |
|
|
2849
GoPro
GPRO
$116M
| $1.21M | ﹤0.01% |
573,104
+261,764
| +84% | +$389K |
|
2850
Campbell Soup
CPB
$6.51B
| $1.21M | ﹤0.01% |
38,418
-64,837
| -63% | -$2.1M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.