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 | |
|---|---|---|---|---|---|---|
626
CALL
BP
BP
$114B
| $20.8M | 0.01% |
602,400
-858,200
| -59% | -$28.7M |
|
627
CALL
Bilibili
BILI
$7.27B
| $20.7M | 0.01% |
736,700
+145,800
| +25% | +$3.5M |
|
628
PUT
Union Pacific
UNP
$181B
| $20.5M | 0.01% |
86,900
-2,200
| -2% | -$496K |
|
629
PUT
Workday
WDAY
$31.8B
| $20.5M | 0.01% |
85,000
-77,600
| -48% | -$17.9M |
|
630
CALL
C3.ai
AI
$1.25B
| $20.3M | 0.01% |
1,168,000
+736,200
| +170% | +$15.4M |
|
631
PUT
XPeng
XPEV
$12B
| $20.2M | 0.01% |
863,000
+54,400
| +7% | +$1.09M |
|
632
PUT
Li Auto
LI
$12.2B
| $20.2M | 0.01% |
796,800
+451,700
| +131% | +$11.7M |
|
633
Fidelity Wise Origin Bitcoin Fund
FBTC
$12B
| $20M | 0.01% |
200,251
+130,480
| +187% | +$13M |
|
634
CALL
Teradyne
TER
$58B
| $19.9M | 0.01% |
144,500
+39,300
| +37% | +$4.29M |
|
635
PUT
Caesars Entertainment
CZR
$6.07B
| $19.9M | 0.01% |
735,800
+72,900
| +11% | +$1.97M |
|
636
PUT
Analog Devices
ADI
$184B
| $19.8M | 0.01% |
80,600
+41,800
| +108% | +$10M |
|
637
CALL
Valero Energy
VLO
$91.6B
| $19.8M | 0.01% |
116,300
-46,700
| -29% | -$6.96M |
|
638
CALL
MPLX
MPLX
$58.3B
| $19.8M | 0.01% |
395,700
+142,500
| +56% | +$7.23M |
|
639
CALL
Enterprise Products Partners
EPD
$84.1B
| $19.8M | 0.01% |
631,700
+48,900
| +8% | +$1.54M |
|
640
PUT
Alcoa
AA
$11.9B
| $19.7M | 0.01% |
600,400
+43,800
| +8% | +$1.36M |
|
641
CALL
Air Products & Chemicals
APD
$65.7B
| $19.7M | 0.01% |
72,200
+67,100
| +1,316% | +$19.4M |
|
642
CALL
Toronto Dominion Bank
TD
$197B
| $19.7M | 0.01% |
246,000
+44,200
| +22% | +$3.32M |
|
643
CALL
Hecla Mining
HL
$10.2B
| $19.6M | 0.01% |
1,618,200
+1,250,400
| +340% | +$10M |
|
644
PUT
Teck Resources
TECK
$29B
| $19.6M | 0.01% |
446,000
-17,900
| -4% | -$650K |
|
645
Eli Lilly
LLY
$1.05T
| $19.6M | 0.01% |
25,633
+20,347
| +385% | +$15.1M |
|
646
CALL
Joby Aviation
JOBY
$7.39B
| $19.6M | 0.01% |
1,211,300
+591,700
| +95% | +$8.99M |
|
647
Coinbase
COIN
$42.8B
| $19.5M | 0.01% |
57,924
+21,798
| +60% | +$7.39M |
|
648
PUT
Kraft Heinz
KHC
$29.9B
| $19.5M | 0.01% |
749,100
-36,600
| -5% | -$994K |
|
649
CALL
Sable Offshore Corp
SOC
$863M
| $19.4M | 0.01% |
1,110,600
+734,700
| +195% | +$18.8M |
|
650
PUT
Amphenol
APH
$193B
| $19.4M | 0.01% |
156,400
-132,700
| -46% | -$14.6M |
|
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.