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 | |
|---|---|---|---|---|---|---|
826
CALL
The Mosaic Company
MOS
$7.08B
| $12.8M | 0.01% |
370,000
+17,100
| +5% | +$589K |
|
827
CALL
Deckers Outdoor
DECK
$13.4B
| $12.8M | 0.01% |
126,200
-145,300
| -54% | -$15.8M |
|
828
PUT
Peabody Energy
BTU
$2.9B
| $12.8M | 0.01% |
482,300
-35,900
| -7% | -$640K |
|
829
CALL
BWX Technologies
BWXT
$16.2B
| $12.8M | 0.01% |
69,300
-6,400
| -8% | -$1.03M |
|
830
CALL
Suncor Energy
SU
$78.4B
| $12.8M | 0.01% |
339,300
-113,600
| -25% | -$4.56M |
|
831
CALL
CarMax
KMX
$8.29B
| $12.7M | 0.01% |
283,800
+173,600
| +158% | +$10.4M |
|
832
PUT
Paychex
PAYX
$39.4B
| $12.7M | 0.01% |
100,200
+41,100
| +70% | +$5.7M |
|
833
PUT
Southern Company
SO
$109B
| $12.7M | 0.01% |
133,900
+53,500
| +67% | +$4.99M |
|
834
PUT
Ally Financial
ALLY
$13.4B
| $12.6M | 0.01% |
322,400
+88,800
| +38% | +$3.56M |
|
835
CALL
UiPath
PATH
$5.28B
| $12.5M | 0.01% |
937,700
+261,900
| +39% | +$3.1M |
|
836
CALL
Invesco S&P SmallCap Low Volatility ETF
XSLV
$246M
| $12.5M | 0.01% |
130,300
-149,000
| -53% | -$6.92M |
|
837
PUT
AngloGold Ashanti
AU
$39.7B
| $12.5M | 0.01% |
177,100
-182,000
| -51% | -$10.2M |
|
838
CALL
Canadian Natural Resources
CNQ
$98B
| $12.4M | 0.01% |
389,400
-96,500
| -20% | -$3.02M |
|
839
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$21.3B
| $12.4M | 0.01% |
103,848
+93,030
| +860% | +$10.6M |
|
|
BNY
840
CALL
Bank of New York Mellon
BNY
$109B
| $12.4M | 0.01% |
113,900
-17,700
| -13% | -$1.81M |
|
841
CALL
Dick's Sporting Goods
DKS
$18.3B
| $12.4M | 0.01% |
55,800
-89,900
| -62% | -$19.6M |
|
|
BULL
842
PUT
Webull Corp
BULL
$4.17B
| $12.4M | 0.01% |
837,600
+365,100
| +77% | +$5.21M |
|
843
CALL
Royal Bank of Canada
RY
$290B
| $12.3M | 0.01% |
83,700
-600
| -0.7% | -$82.7K |
|
844
PUT
AGNC Investment
AGNC
$12.3B
| $12.3M | 0.01% |
1,255,500
+100,000
| +9% | +$969K |
|
845
PUT
HP
HPQ
$22.4B
| $12.3M | 0.01% |
451,300
-45,600
| -9% | -$1.22M |
|
846
CALL
Edwards Lifesciences
EW
$48.3B
| $12.3M | 0.01% |
157,800
+48,000
| +44% | +$3.75M |
|
847
PUT
Burlington
BURL
$21.4B
| $12.3M | 0.01% |
48,200
-18,900
| -28% | -$5.13M |
|
848
PUT
General Dynamics
GD
$103B
| $12.2M | 0.01% |
35,800
+6,700
| +23% | +$2.11M |
|
849
PUT
ATI
ATI
$27.3B
| $12.2M | 0.01% |
149,600
+63,500
| +74% | +$5.15M |
|
850
CALL
Linde
LIN
$234B
| $12.2M | 0.01% |
25,600
-2,700
| -10% | -$1.28M |
|
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.