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 | |
|---|---|---|---|---|---|---|
776
CALL
Sprott Uranium Miners ETF
URNM
$1.84B
| $14M | 0.01% |
258,000
+151,900
| +143% | +$7.64M |
|
777
CALL
Rio Tinto
RIO
$149B
| $14M | 0.01% |
211,900
+39,500
| +23% | +$2.44M |
|
778
CALL
Schwab US Broad Market ETF
SCHB
$42.7B
| $14M | 0.01% |
502,200
+15,800
| +3% | +$391K |
|
779
PUT
Archer Aviation
ACHR
$3.9B
| $14M | 0.01% |
1,458,700
-449,000
| -24% | -$4.44M |
|
780
PUT
Joby Aviation
JOBY
$7.42B
| $14M | 0.01% |
865,600
+290,300
| +50% | +$4.41M |
|
781
CALL
Williams Companies
WMB
$92B
| $13.9M | 0.01% |
220,000
-36,800
| -14% | -$2.16M |
|
782
PUT
Expedia Group
EXPE
$30.9B
| $13.9M | 0.01% |
65,100
-66,800
| -51% | -$13.4M |
|
783
CALL
Peabody Energy
BTU
$2.9B
| $13.9M | 0.01% |
522,900
+146,600
| +39% | +$2.61M |
|
784
PUT
Nextpower Inc
NXT
$15.8B
| $13.9M | 0.01% |
187,400
+18,700
| +11% | +$1.2M |
|
785
CALL
EOG Resources
EOG
$77.5B
| $13.8M | 0.01% |
123,300
-75,300
| -38% | -$8.98M |
|
|
CMA
786
CALL
DELISTED
Comerica
CMA
| $13.8M | 0.01% |
201,100
+167,000
| +490% | +$11.2M |
|
787
CALL
Lumen
LUMN
$6.73B
| $13.8M | 0.01% |
2,250,300
+1,081,700
| +93% | +$5.19M |
|
788
CALL
Arthur J. Gallagher & Co
AJG
$62.2B
| $13.8M | 0.01% |
44,400
+26,500
| +148% | +$7.99M |
|
789
Eos Energy Enterprises
EOSE
$1.32B
| $13.7M | 0.01% |
1,203,622
+230,958
| +24% | +$1.58M |
|
790
CALL
United Rentals
URI
$71.4B
| $13.7M | 0.01% |
14,300
-400
| -3% | -$356K |
|
791
CALL
Alamos Gold
AGI
$12.3B
| $13.6M | 0.01% |
390,600
+37,700
| +11% | +$1.08M |
|
792
Nu Holdings
NU
$68.5B
| $13.6M | 0.01% |
848,942
-397,575
| -32% | -$5.55M |
|
793
PUT
Novartis
NVS
$297B
| $13.6M | 0.01% |
106,000
-800
| -0.7% | -$97.6K |
|
794
CALL
uniQure
QURE
$2.71B
| $13.6M | 0.01% |
232,600
-110,100
| -32% | -$2M |
|
795
CALL
HCA Healthcare
HCA
$83.5B
| $13.6M | 0.01% |
31,800
-8,300
| -21% | -$3.22M |
|
|
BNY
796
PUT
Bank of New York Mellon
BNY
$109B
| $13.5M | 0.01% |
124,000
+74,400
| +150% | +$7.59M |
|
797
PUT
CME Group
CME
$91.9B
| $13.5M | 0.01% |
50,000
-7,000
| -12% | -$1.9M |
|
798
CALL
Truist Financial
TFC
$62.5B
| $13.5M | 0.01% |
295,300
-155,700
| -35% | -$7.02M |
|
799
PUT
Tenet Healthcare
THC
$17.1B
| $13.5M | 0.01% |
66,400
+36,500
| +122% | +$6.48M |
|
800
CALL
Carlyle Group
CG
$16B
| $13.4M | 0.01% |
214,400
+12,800
| +6% | +$800K |
|
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.