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 | |
|---|---|---|---|---|---|---|
5476
Genco Shipping & Trading
GNK
$1.11B
| $127K | ﹤0.01% |
+7,142
| New | +$118K |
|
5477
CALL
Integra LifeSciences
IART
$1.29B
| $127K | ﹤0.01% |
8,900
+5,900
| +197% | +$80.8K |
|
5478
CALL
Kinsale Capital Group
KNSL
$8.12B
| $127K | ﹤0.01% |
300
-1,000
| -77% | -$453K |
|
|
5479
PUT
Kinsale Capital Group
KNSL
$8.12B
| $127K | ﹤0.01% |
300
-200
| -40% | -$90.7K |
|
5480
PUT
NNN REIT
NNN
$9.04B
| $127K | ﹤0.01% |
3,000
+600
| +25% | +$25.5K |
|
5481
CALL
VistaGen Therapeutics
VTGN
$9.89M
| $127K | ﹤0.01% |
35,900
-1,000
| -3% | -$2.99K |
|
|
AIOT
5482
PowerFleet Inc
AIOT
$526M
| $127K | ﹤0.01% |
24,318
+16,006
| +193% | +$73.9K |
|
|
CRCA
5483
ProShares Ultra CRCL
CRCA
$78.9M
| $127K | ﹤0.01% |
+873
| New | +$141K |
|
5484
CALL
Atmus Filtration Technologies
ATMU
$4.22B
| $126K | ﹤0.01% |
2,800
-800
| -22% | -$33.6K |
|
5485
Brilliant Earth
BRLT
$17.1M
| $126K | ﹤0.01% |
60,991
+60,815
| +34,554% | +$123K |
|
5486
PUT
Immunome
IMNM
$2.58B
| $126K | ﹤0.01% |
10,800
+4,300
| +66% | +$42.8K |
|
5487
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.47B
| $126K | ﹤0.01% |
10,200
-13,400
| -57% | -$165K |
|
5488
CALL
Nuvation Bio
NUVB
$2.2B
| $126K | ﹤0.01% |
34,200
+11,800
| +53% | +$32.2K |
|
5489
PTC
PTC
$15.8B
| $126K | ﹤0.01% |
+624
| New | +$127K |
|
5490
CALL
Aldeyra Therapeutics
ALDX
$92.9M
| $125K | ﹤0.01% |
24,000
-64,900
| -73% | -$338K |
|
5491
PUT
CNX Resources
CNX
$5.3B
| $125K | ﹤0.01% |
3,900
-8,500
| -69% | -$260K |
|
5492
CALL
Danaos Corp
DAC
$2.58B
| $125K | ﹤0.01% |
1,400
-10,600
| -88% | -$977K |
|
5493
CALL
Embecta
EMBC
$216M
| $125K | ﹤0.01% |
8,900
+4,700
| +112% | +$59.5K |
|
5494
T-Rex 2X Long Alphabet Daily Target ETF
GOOX
$51.1M
| $125K | ﹤0.01% |
2,836
+1,802
| +174% | +$61.4K |
|
5495
PUT
Hilton Grand Vacations
HGV
$3.59B
| $125K | ﹤0.01% |
3,000
| – | – |
|
|
HYFT
5496
CALL
MindWalk Holdings
HYFT
$60.6M
| $125K | ﹤0.01% |
71,900
+60,200
| +515% | +$118K |
|
5497
PUT
Phibro Animal Health
PAHC
$1.47B
| $125K | ﹤0.01% |
+3,100
| New | +$102K |
|
|
WTMY
5498
CALL
WisdomTree High Income Laddered Municipal Fund
WTMY
$4.99M
| $125K | ﹤0.01% |
2,700
-300
| -10% | -$7.49K |
|
5499
PUT
Gossamer Bio
GOSS
$82.9M
| $124K | ﹤0.01% |
47,200
+10,600
| +29% | +$23.4K |
|
5500
Hayward Holdings
HAYW
$3.21B
| $124K | ﹤0.01% |
8,228
+3,782
| +85% | +$57.9K |
|
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.