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 | |
|---|---|---|---|---|---|---|
851
PUT
Archer Daniels Midland
ADM
$41.6B
| $12.1M | 0.01% |
203,100
-19,000
| -9% | -$1.11M |
|
852
PUT
Alnylam Pharmaceuticals
ALNY
$35.9B
| $12.1M | 0.01% |
26,600
+4,300
| +19% | +$1.75M |
|
853
PUT
Dick's Sporting Goods
DKS
$18.3B
| $12M | 0.01% |
54,200
-83,200
| -61% | -$18.1M |
|
854
PUT
Twilio
TWLO
$28.1B
| $12M | 0.01% |
119,500
+14,200
| +13% | +$1.6M |
|
855
PUT
BILL Holdings
BILL
$4.11B
| $11.9M | 0.01% |
225,200
+125,500
| +126% | +$5.83M |
|
856
CALL
Kohl's
KSS
$2.06B
| $11.9M | 0.01% |
775,600
+379,100
| +96% | +$5.05M |
|
857
CALL
Vodafone
VOD
$35.1B
| $11.9M | 0.01% |
1,023,300
+188,100
| +23% | +$2.15M |
|
858
CALL
MetLife
MET
$59.5B
| $11.9M | 0.01% |
144,100
+28,700
| +25% | +$2.26M |
|
859
CALL
American Tower
AMT
$76.7B
| $11.8M | 0.01% |
61,600
+20,300
| +49% | +$4.23M |
|
860
PUT
Best Buy
BBY
$17.8B
| $11.8M | 0.01% |
156,400
-80,600
| -34% | -$5.78M |
|
861
PUT
Las Vegas Sands
LVS
$30.5B
| $11.8M | 0.01% |
404,200
+92,200
| +30% | +$4.85M |
|
862
PUT
Sphere Entertainment
SPHR
$4.77B
| $11.8M | 0.01% |
189,600
+170,600
| +898% | +$8.05M |
|
863
PUT
Rubrik
RBRK
$14.9B
| $11.8M | 0.01% |
143,100
+37,400
| +35% | +$3.22M |
|
864
PUT
Energy Transfer Partners
ET
$70.3B
| $11.7M | 0.01% |
684,500
-555,800
| -45% | -$9.74M |
|
865
PUT
Bitdeer Technologies
BTDR
$2.96B
| $11.7M | 0.01% |
686,800
+514,400
| +298% | +$7.22M |
|
866
PUT
GSK
GSK
$102B
| $11.7M | 0.01% |
270,500
-66,500
| -20% | -$2.6M |
|
867
PUT
Enphase Energy
ENPH
$5.13B
| $11.7M | 0.01% |
329,700
-368,900
| -53% | -$13.7M |
|
868
CALL
Gold Fields
GFI
$28.9B
| $11.7M | 0.01% |
277,800
+18,600
| +7% | +$577K |
|
869
PUT
JPMorgan Inflation Managed Bond ETF
JCPI
$865M
| $11.7M | 0.01% |
202,600
+166,400
| +460% | +$8.07M |
|
870
PUT
Hershey
HSY
$34.9B
| $11.6M | 0.01% |
62,200
+18,300
| +42% | +$3.33M |
|
871
CALL
Southwest Airlines
LUV
$21.9B
| $11.6M | 0.01% |
363,000
+63,700
| +21% | +$2.08M |
|
872
Bristol-Myers Squibb
BMY
$126B
| $11.6M | 0.01% |
256,777
+192,084
| +297% | +$8.97M |
|
873
PUT
Abercrombie & Fitch
ANF
$4.04B
| $11.6M | 0.01% |
135,300
-134,000
| -50% | -$12.5M |
|
874
CALL
Stem
STEM
$52M
| $11.6M | 0.01% |
659,500
+7,600
| +1% | +$107K |
|
875
CALL
ProShares Ether Strategy ETF
EETH
$54.6M
| $11.5M | 0.01% |
444,500
+4,300
| +1% | +$291K |
|
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.