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 | |
|---|---|---|---|---|---|---|
5826
V2X
VVX
$2.83B
| $94K | ﹤0.01% |
1,631
+1,568
| +2,489% | +$83.8K |
|
5827
Agilon Health
AGL
$1.53B
| $93K | ﹤0.01% |
3,636
+833
| +30% | +$31.5K |
|
5828
CALL
DMC Global
BOOM
$138M
| $93K | ﹤0.01% |
11,100
+5,300
| +91% | +$39.7K |
|
5829
CALL
CareTrust REIT
CTRE
$9.91B
| $93K | ﹤0.01% |
2,700
-3,400
| -56% | -$112K |
|
5830
CALL
Dine Brands
DIN
$456M
| $93K | ﹤0.01% |
3,800
-700
| -16% | -$16.4K |
|
5831
H.B. Fuller
FUL
$2.97B
| $93K | ﹤0.01% |
1,570
-3,031
| -66% | -$182K |
|
5832
PUT
The Honest Company
HNST
$402M
| $93K | ﹤0.01% |
25,300
+12,400
| +96% | +$52.6K |
|
|
KNDI
5833
Kandi Technologies Group
KNDI
$67.5M
| $93K | ﹤0.01% |
77,597
+69,458
| +853% | +$89.7K |
|
5834
CALL
Myriad Genetics
MYGN
$270M
| $93K | ﹤0.01% |
13,000
+11,900
| +1,082% | +$70.7K |
|
5835
CALL
Patrick Industries
PATK
$2.74B
| $93K | ﹤0.01% |
900
-400
| -31% | -$42K |
|
5836
PUT
W&T Offshore
WTI
$534M
| $93K | ﹤0.01% |
51,600
+44,400
| +617% | +$78.9K |
|
|
CRCG
5837
CALL
Leverage Shares 2X Long CRCL Daily ETF
CRCG
$82M
| $93K | ﹤0.01% |
+700
| New | +$69.2K |
|
|
CVSA
5838
PUT
Covista Inc
CVSA
$4.25B
| $92K | ﹤0.01% |
600
-600
| -50% | -$76.8K |
|
5839
Direxion Daily Healthcare Bull 3X ETF
CURE
$178M
| $92K | ﹤0.01% |
1,111
+754
| +211% | +$58.7K |
|
5840
PUT
Invesco DB Base Metals Fund
DBB
$312M
| $92K | ﹤0.01% |
5,800
-2,500
| -30% | -$49.2K |
|
|
EMBJ
5841
PUT
Embraer S.A. ADS
EMBJ
$12.2B
| $92K | ﹤0.01% |
50,000
+22,700
| +83% | +$1.28M |
|
5842
Hess Midstream
HESM
$5.24B
| $92K | ﹤0.01% |
+2,670
| New | +$106K |
|
5843
PUT
MDU Resources
MDU
$4.17B
| $92K | ﹤0.01% |
+5,200
| New | +$86.8K |
|
5844
PUT
Texas Capital Bancshares
TCBI
$4.3B
| $92K | ﹤0.01% |
+1,100
| New | +$94K |
|
5845
PUT
Millicom
TIGO
$16B
| $92K | ﹤0.01% |
1,900
-400
| -17% | -$17.6K |
|
5846
CALL
Tango Therapeutics
TNGX
$4.43B
| $92K | ﹤0.01% |
11,000
+8,200
| +293% | +$55.5K |
|
5847
CALL
Vera Therapeutics
VERA
$2.3B
| $92K | ﹤0.01% |
3,200
-126,800
| -98% | -$2.93M |
|
5848
CALL
XPEL
XPEL
$1.22B
| $92K | ﹤0.01% |
2,800
-700
| -20% | -$24.8K |
|
|
LUCK
5849
PUT
Lucky Strike Entertainment
LUCK
$914M
| $92K | ﹤0.01% |
9,000
+5,900
| +190% | +$59.4K |
|
5850
CALL
Consolidated Water Co
CWCO
$467M
| $91K | ﹤0.01% |
2,600
+2,500
| +2,500% | +$79.6K |
|
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.