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 | |
|---|---|---|---|---|---|---|
|
CALY
3601
CALL
Callaway Golf Company
CALY
$3.28B
| $599K | ﹤0.01% |
63,100
-37,700
| -37% | -$350K |
|
3602
PUT
Waters Corp
WAT
$37.7B
| $599K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$573K |
|
3603
Solventum
SOLV
$14.9B
| $599K | ﹤0.01% |
8,209
-24,574
| -75% | -$1.8M |
|
|
TEN
3604
Tsakos Energy Navigation Ltd
TEN
$1.18B
| $599K | ﹤0.01% |
+26,983
| New | +$567K |
|
|
AL
3605
PUT
DELISTED
Air Lease Corp
AL
| $598K | ﹤0.01% |
9,400
-36,400
| -79% | -$2.17M |
|
3606
PUT
Camtek
CAMT
$6.53B
| $598K | ﹤0.01% |
5,700
+400
| +8% | +$35.8K |
|
|
NAK
3607
CALL
Northern Dynasty Minerals
NAK
$812M
| $598K | ﹤0.01% |
498,600
-68,300
| -12% | -$73.4K |
|
3608
PUT
Essential Utilities
WTRG
$11.5B
| $598K | ﹤0.01% |
15,000
+6,100
| +69% | +$233K |
|
|
SGI
3609
PUT
Somnigroup International
SGI
$15.2B
| $598K | ﹤0.01% |
7,100
+1,500
| +27% | +$118K |
|
3610
CALL
Kemper
KMPR
$1.82B
| $597K | ﹤0.01% |
11,600
| – | – |
|
3611
TG Therapeutics
TGTX
$8.4B
| $597K | ﹤0.01% |
+16,534
| New | +$545K |
|
3612
Tyler Technologies
TYL
$13.7B
| $596K | ﹤0.01% |
1,140
+750
| +192% | +$421K |
|
3613
CALL
Flowserve
FLS
$9.38B
| $595K | ﹤0.01% |
11,200
-200
| -2% | -$10.9K |
|
|
SKE
3614
CALL
Skeena Resources
SKE
$3.28B
| $595K | ﹤0.01% |
32,300
+14,000
| +77% | +$229K |
|
3615
CVR Energy
CVI
$3.39B
| $594K | ﹤0.01% |
16,310
+3,596
| +28% | +$108K |
|
3616
PUT
Endava
DAVA
$153M
| $593K | ﹤0.01% |
65,200
+48,400
| +288% | +$603K |
|
3617
Perimeter Solutions
PRM
$5.69B
| $592K | ﹤0.01% |
+26,481
| New | +$502K |
|
3618
VICI Properties
VICI
$29.8B
| $592K | ﹤0.01% |
+18,170
| New | +$599K |
|
3619
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.65B
| $590K | ﹤0.01% |
26,200
-7,300
| -22% | -$162K |
|
3620
argenx
ARGX
$54.6B
| $589K | ﹤0.01% |
799
-339
| -30% | -$224K |
|
3621
Ralph Lauren
RL
$22.5B
| $589K | ﹤0.01% |
+1,879
| New | +$560K |
|
3622
Direxion Daily Technology Bull 3x ETF
TECL
$4.77B
| $589K | ﹤0.01% |
4,742
-4,279
| -47% | -$449K |
|
|
PSIX
3623
PUT
Power Solutions International
PSIX
$643M
| $589K | ﹤0.01% |
+6,000
| New | +$532K |
|
3624
Carrier Global
CARR
$52.5B
| $588K | ﹤0.01% |
+9,859
| New | +$670K |
|
|
ESPR
3625
CALL
DELISTED
Esperion Therapeutics
ESPR
| $588K | ﹤0.01% |
221,900
+165,600
| +294% | +$320K |
|
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.