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 | |
|---|---|---|---|---|---|---|
576
CALL
Coupang
CPNG
$27.8B
| $23.5M | 0.01% |
728,500
-276,300
| -27% | -$8.35M |
|
577
PUT
Okta
OKTA
$23.4B
| $23.4M | 0.01% |
255,100
+100,900
| +65% | +$9.42M |
|
578
PUT
Snap
SNAP
$7.3B
| $23.4M | 0.01% |
3,034,100
+1,601,900
| +112% | +$13.3M |
|
|
BMNR
579
BitMine Immersion Technologies
BMNR
$9.92B
| $23.3M | 0.01% |
+448,488
| New | +$22.7M |
|
|
FIG
580
CALL
Figma
FIG
$10.7B
| $23.3M | 0.01% |
+448,600
| New | +$30.8M |
|
|
FISV
581
PUT
Fiserv Inc
FISV
$26.7B
| $23.2M | 0.01% |
180,300
+98,500
| +120% | +$14.1M |
|
582
PUT
Credo Technology Group
CRDO
$43.3B
| $23.2M | 0.01% |
159,300
-187,700
| -54% | -$23M |
|
583
PUT
Phillips 66
PSX
$84.6B
| $23.2M | 0.01% |
170,500
+4,400
| +3% | +$564K |
|
|
584
CALL
Okta
OKTA
$23.4B
| $23.2M | 0.01% |
252,500
+1,300
| +0.5% | +$121K |
|
585
CALL
Petrobras
PBR
$124B
| $23.1M | 0.01% |
1,868,100
+1,056,800
| +130% | +$13.3M |
|
586
PUT
Duolingo
DUOL
$5.55B
| $23.1M | 0.01% |
71,700
+46,400
| +183% | +$15.5M |
|
|
IPFF
587
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $22.9M | 0.01% |
344,400
-90,100
| -21% | -$5.99M |
|
588
PUT
Kratos Defense & Security Solutions
KTOS
$9.43B
| $22.8M | 0.01% |
249,500
+119,400
| +92% | +$7.65M |
|
589
CALL
FedEx
FDX
$74.8B
| $22.8M | 0.01% |
96,600
-54,600
| -36% | -$12.6M |
|
590
PUT
Charter Communications
CHTR
$15.5B
| $22.7M | 0.01% |
82,600
-9,700
| -11% | -$2.93M |
|
591
CALL
CAVA Group
CAVA
$7.2B
| $22.6M | 0.01% |
373,900
+28,600
| +8% | +$2.17M |
|
592
CALL
Grab
GRAB
$13.4B
| $22.5M | 0.01% |
3,742,600
+1,228,500
| +49% | +$6.52M |
|
593
PUT
uniQure
QURE
$2.71B
| $22.5M | 0.01% |
386,000
+312,700
| +427% | +$5.68M |
|
594
PUT
Atlassian
TEAM
$20.8B
| $22.5M | 0.01% |
140,900
+23,900
| +20% | +$4.32M |
|
595
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$427M
| $22.4M | 0.01% |
766,750
+132,850
| +21% | +$9.05M |
|
|
SNDK
596
PUT
Sandisk
SNDK
$245B
| $22.3M | 0.01% |
198,500
+169,700
| +589% | +$9.91M |
|
597
CALL
Constellation Brands
STZ
$22.1B
| $22.2M | 0.01% |
164,600
+35,100
| +27% | +$5.58M |
|
598
CALL
Enphase Energy
ENPH
$5.02B
| $22.1M | 0.01% |
625,700
+120,100
| +24% | +$4.46M |
|
599
CALL
Cleveland-Cliffs
CLF
$6.38B
| $22.1M | 0.01% |
1,814,500
-220,900
| -11% | -$2.32M |
|
600
PUT
e.l.f. Beauty
ELF
$4.47B
| $22M | 0.01% |
166,300
-23,000
| -12% | -$2.84M |
|
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.