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 | |
|---|---|---|---|---|---|---|
6276
PUT
Rekor Systems
REKR
$84.6M
| $60K | ﹤0.01% |
38,600
+13,500
| +54% | +$17.1K |
|
6277
CALL
Seacoast Banking Corp of Florida
SBCF
$3.35B
| $60K | ﹤0.01% |
+2,000
| New | +$59.3K |
|
6278
Xylem
XYL
$27.3B
| $60K | ﹤0.01% |
413
+236
| +133% | +$32.7K |
|
|
VTEL
6279
PUT
Vanguard Long-Term Tax-Exempt Bond ETF
VTEL
$281M
| $60K | ﹤0.01% |
1,200
-6,800
| -85% | -$681K |
|
|
SLAI
6280
DELISTED
SOLAI Ltd ADS
SLAI
| $59K | ﹤0.01% |
3,149
+3,085
| +4,820% | +$64.6K |
|
6281
Clear Channel Outdoor Holdings
CCO
$1.23B
| $59K | ﹤0.01% |
37,813
-77,198
| -67% | -$96.2K |
|
6282
Comtech Telecommunications
CMTL
$50.9M
| $59K | ﹤0.01% |
23,009
-14,786
| -39% | -$33.8K |
|
6283
PUT
Delek Logistics
DKL
$3.14B
| $59K | ﹤0.01% |
1,300
-14,400
| -92% | -$637K |
|
|
FBRT
6284
CALL
Franklin BSP Realty Trust
FBRT
$596M
| $59K | ﹤0.01% |
5,500
-300
| -5% | -$3.31K |
|
6285
CALL
Green Brick Partners
GRBK
$3.03B
| $59K | ﹤0.01% |
800
-700
| -47% | -$47.8K |
|
6286
PUT
ICU Medical
ICUI
$4.21B
| $59K | ﹤0.01% |
500
+100
| +25% | +$12.7K |
|
6287
Invesco KBW High Dividend Yield Financial ETF
KBWD
$411M
| $59K | ﹤0.01% |
4,398
+1,412
| +47% | +$19.8K |
|
|
NLOP
6288
PUT
Net Lease Office Properties
NLOP
$174M
| $59K | ﹤0.01% |
2,000
+1,500
| +300% | +$47.1K |
|
6289
PUT
NatWest
NWG
$73.7B
| $59K | ﹤0.01% |
4,200
+1,700
| +68% | +$24K |
|
6290
CALL
OptimizeRx
OPRX
$118M
| $59K | ﹤0.01% |
2,900
-800
| -22% | -$12.7K |
|
6291
Pultegroup
PHM
$24.5B
| $59K | ﹤0.01% |
450
-919
| -67% | -$114K |
|
6292
PUT
Simply Good Foods
SMPL
$918M
| $59K | ﹤0.01% |
2,400
+1,100
| +85% | +$32.5K |
|
6293
Titan Machinery
TITN
$413M
| $59K | ﹤0.01% |
3,542
-17,940
| -84% | -$352K |
|
6294
CALL
Trustmark
TRMK
$2.77B
| $59K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$54.6K |
|
6295
CALL
Visteon
VC
$2.8B
| $59K | ﹤0.01% |
500
-4,700
| -90% | -$553K |
|
|
EMPD
6296
Empery Digital
EMPD
$86.6M
| $59K | ﹤0.01% |
+7,912
| New | +$71.5K |
|
6297
Viridian Therapeutics
VRDN
$2.2B
| $59K | ﹤0.01% |
+2,756
| New | +$49.7K |
|
6298
Worthington Steel
WS
$1.75B
| $59K | ﹤0.01% |
1,967
+1,389
| +240% | +$44.3K |
|
6299
CALL
A10 Networks
ATEN
$2.16B
| $58K | ﹤0.01% |
3,200
-16,800
| -84% | -$304K |
|
6300
Betterware México
BWMX
$655M
| $58K | ﹤0.01% |
4,367
+4,055
| +1,300% | +$49.4K |
|
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.