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 | |
|---|---|---|---|---|---|---|
551
CALL
Fidelity Wise Origin Bitcoin Fund
FBTC
$12.2B
| $25.1M | 0.01% |
251,500
+8,600
| +4% | +$859K |
|
|
SCIU
552
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $25M | 0.01% |
527,800
-30,500
| -5% | -$1.45M |
|
553
CALL
Fortinet
FTNT
$114B
| $25M | 0.01% |
297,200
+92,200
| +45% | +$8.23M |
|
554
CALL
Amphenol
APH
$194B
| $25M | 0.01% |
201,800
-170,100
| -46% | -$18.7M |
|
|
P
555
CALL
Everpure Inc
P
$24.8B
| $25M | 0.01% |
297,900
+135,700
| +84% | +$9.02M |
|
556
JD.com
JD
$40.7B
| $24.9M | 0.01% |
711,021
+607,117
| +584% | +$19.8M |
|
557
PUT
Intuit
INTU
$77.8B
| $24.8M | 0.01% |
36,300
-17,700
| -33% | -$12.8M |
|
558
PUT
Core Scientific
CORZ
$7.51B
| $24.6M | 0.01% |
1,374,000
-100,700
| -7% | -$1.48M |
|
559
AbbVie
ABBV
$448B
| $24.6M | 0.01% |
+106,084
| New | +$21.6M |
|
560
CALL
Mercado Libre
MELI
$91.2B
| $24.5M | 0.01% |
10,500
+600
| +6% | +$1.44M |
|
561
CALL
Duke Energy
DUK
$99.7B
| $24.5M | 0.01% |
197,700
+22,600
| +13% | +$2.74M |
|
562
CALL
Charter Communications
CHTR
$15.9B
| $24.4M | 0.01% |
88,800
+15,500
| +21% | +$4.68M |
|
563
CALL
United States Oil Fund
USO
$2.36B
| $24.3M | 0.01% |
329,000
-478,800
| -59% | -$35.9M |
|
|
AXON
564
CALL
Axon Enterprise
AXON
$39.6B
| $24.3M | 0.01% |
33,800
+1,100
| +3% | +$835K |
|
565
PUT
Trump Media & Technology Group
DJT
$2.56B
| $24.2M | 0.01% |
1,474,600
+452,600
| +44% | +$8.03M |
|
566
PUT
Deere & Co
DE
$164B
| $24.2M | 0.01% |
52,900
-1,700
| -3% | -$838K |
|
567
PUT
NRG Energy
NRG
$29.5B
| $24M | 0.01% |
148,300
+17,100
| +13% | +$2.66M |
|
568
PUT
Vale
VALE
$63.2B
| $24M | 0.01% |
2,211,100
+399,200
| +22% | +$4.08M |
|
569
PUT
Gilead Sciences
GILD
$162B
| $24M | 0.01% |
216,200
-105,500
| -33% | -$12M |
|
570
PUT
Dow Inc
DOW
$22.5B
| $23.9M | 0.01% |
1,050,000
+79,100
| +8% | +$1.97M |
|
571
AST SpaceMobile
ASTS
$18.5B
| $23.9M | 0.01% |
487,145
+253,260
| +108% | +$12.2M |
|
572
CALL
Ciena
CIEN
$56.2B
| $23.8M | 0.01% |
163,500
+30,600
| +23% | +$3.12M |
|
|
HUT
573
CALL
Hut 8
HUT
$12.4B
| $23.8M | 0.01% |
683,900
+500
| +0.1% | +$12.7K |
|
574
CALL
Interactive Brokers
IBKR
$41.7B
| $23.7M | 0.01% |
344,100
-14,900
| -4% | -$937K |
|
|
575
CALL
Dow Inc
DOW
$22.5B
| $23.6M | 0.01% |
1,033,500
+466,100
| +82% | +$11.6M |
|
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.