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 | |
|---|---|---|---|---|---|---|
601
CALL
NuScale Power
SMR
$3.06B
| $21.9M | 0.01% |
609,200
-120,600
| -17% | -$4.81M |
|
602
CALL
Kinder Morgan
KMI
$72.3B
| $21.8M | 0.01% |
770,200
+207,900
| +37% | +$5.69M |
|
603
State Street Technology Select Sector SPDR ETF
XLK
$116B
| $21.7M | 0.01% |
153,666
+150,736
| +5,145% | +$20M |
|
604
PUT
Autodesk
ADSK
$43B
| $21.5M | 0.01% |
67,800
+14,000
| +26% | +$4.27M |
|
605
CALL
On Holding
ONON
$11.8B
| $21.5M | 0.01% |
508,200
-122,600
| -19% | -$5.83M |
|
606
PUT
Devon Energy
DVN
$52.3B
| $21.5M | 0.01% |
613,100
-440,800
| -42% | -$15M |
|
|
SNDK
607
CALL
Sandisk
SNDK
$249B
| $21.5M | 0.01% |
191,500
+69,600
| +57% | +$4.06M |
|
|
TEM
608
PUT
Tempus AI
TEM
$8.32B
| $21.5M | 0.01% |
265,900
-153,300
| -37% | -$10.7M |
|
609
PUT
Agnico Eagle Mines
AEM
$72.1B
| $21.5M | 0.01% |
127,300
-94,300
| -43% | -$13M |
|
610
CALL
Dollar General
DG
$25.3B
| $21.5M | 0.01% |
207,600
+20,600
| +11% | +$2.26M |
|
611
CALL
Insmed
INSM
$23.3B
| $21.4M | 0.01% |
148,700
+200
| +0.1% | +$24.5K |
|
612
PUT
Elevance Health
ELV
$82.1B
| $21.4M | 0.01% |
66,200
+37,200
| +128% | +$11.6M |
|
613
CALL
First Majestic Silver
AG
$8.15B
| $21.3M | 0.01% |
1,733,400
+714,000
| +70% | +$6.62M |
|
614
CALL
Quantum Computing Inc
QUBT
$1.77B
| $21.3M | 0.01% |
1,155,100
+328,000
| +40% | +$5.63M |
|
615
CALL
Toast
TOST
$16.5B
| $21.2M | 0.01% |
581,900
+86,400
| +17% | +$3.75M |
|
616
PUT
RH
RH
$3.13B
| $21.2M | 0.01% |
104,200
+27,100
| +35% | +$5.89M |
|
617
CALL
Kinross Gold
KGC
$28.3B
| $21.2M | 0.01% |
851,400
+295,100
| +53% | +$5.68M |
|
618
PUT
Eos Energy Enterprises
EOSE
$1.34B
| $21M | 0.01% |
1,846,200
+49,800
| +3% | +$341K |
|
619
CALL
Centrus Energy
LEU
$3.36B
| $21M | 0.01% |
67,800
-9,800
| -13% | -$2.17M |
|
620
PUT
Electronic Arts
EA
$52.4B
| $21M | 0.01% |
104,200
-20,800
| -17% | -$3.44M |
|
621
PUT
Comcast
CMCSA
$80.6B
| $21M | 0.01% |
668,700
-36,800
| -5% | -$1.23M |
|
622
CALL
Workday
WDAY
$31.8B
| $21M | 0.01% |
87,200
+18,700
| +27% | +$4.32M |
|
|
623
CALL
Elevance Health
ELV
$82.1B
| $20.9M | 0.01% |
64,700
+31,500
| +95% | +$9.8M |
|
|
FISV
624
CALL
Fiserv Inc
FISV
$26.5B
| $20.8M | 0.01% |
227,300
+44,200
| +24% | +$6.33M |
|
|
DOCU
625
PUT
DocuSign
DOCU
$8.98B
| $20.8M | 0.01% |
288,000
+124,600
| +76% | +$9.6M |
|
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.