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 | |
|---|---|---|---|---|---|---|
2651
PUT
Bit Digital
BTBT
$484M
| $1.45M | ﹤0.01% |
484,900
+133,900
| +38% | +$406K |
|
2652
PUT
Travere Therapeutics
TVTX
$5.33B
| $1.45M | ﹤0.01% |
60,800
+15,900
| +35% | +$299K |
|
2653
CALL
MoonLake Immunotherapeutics
MLTX
$1.59B
| $1.45M | ﹤0.01% |
202,500
+186,900
| +1,198% | +$9.74M |
|
2654
PUT
Navient
NAVI
$774M
| $1.45M | ﹤0.01% |
110,400
-1,900
| -2% | -$25.8K |
|
2655
Redwire
RDW
$2.08B
| $1.45M | ﹤0.01% |
161,465
+112,697
| +231% | +$1.32M |
|
2656
PUT
Organon & Co
OGN
$3.55B
| $1.45M | ﹤0.01% |
135,800
+20,100
| +17% | +$197K |
|
|
WYFI
2657
PUT
WhiteFiber Inc
WYFI
$912M
| $1.45M | ﹤0.01% |
+53,400
| New | +$1.04M |
|
2658
CALL
InterDigital
IDCC
$6.68B
| $1.45M | ﹤0.01% |
4,200
+2,900
| +223% | +$788K |
|
2659
BP
BP
$113B
| $1.45M | ﹤0.01% |
42,037
-99,489
| -70% | -$3.33M |
|
2660
PUT
Signet Jewelers
SIG
$3.55B
| $1.45M | ﹤0.01% |
15,100
-4,600
| -23% | -$394K |
|
|
XIFR
2661
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $1.45M | ﹤0.01% |
142,200
-191,000
| -57% | -$1.85M |
|
2662
CALL
Texas Roadhouse
TXRH
$12.7B
| $1.45M | ﹤0.01% |
8,700
+1,200
| +16% | +$211K |
|
|
HUT
2663
Hut 8
HUT
$12.4B
| $1.44M | ﹤0.01% |
41,432
-35,657
| -46% | -$906K |
|
2664
ON Semiconductor
ON
$33.8B
| $1.44M | ﹤0.01% |
29,232
-97,281
| -77% | -$5.12M |
|
2665
Mondelez International
MDLZ
$77.7B
| $1.44M | ﹤0.01% |
22,978
-70,541
| -75% | -$4.55M |
|
2666
CALL
Molson Coors Class B
TAP
$7.68B
| $1.43M | ﹤0.01% |
31,700
+19,300
| +156% | +$953K |
|
2667
PUT
Atlanta Braves Holdings Series B
BATRK
$3.23B
| $1.43M | ﹤0.01% |
33,700
+7,500
| +29% | +$331K |
|
2668
PUT
BlackLine
BL
$1.69B
| $1.43M | ﹤0.01% |
27,000
+16,000
| +145% | +$864K |
|
2669
CALL
Fidelity National Financial
FNF
$13.9B
| $1.43M | ﹤0.01% |
23,700
-600
| -2% | -$34.9K |
|
|
JKS
2670
PUT
JinkoSolar
JKS
$775M
| $1.43M | ﹤0.01% |
59,600
+7,400
| +14% | +$175K |
|
2671
CALL
Life Time Group Holdings
LTH
$9.42B
| $1.43M | ﹤0.01% |
51,900
+27,800
| +115% | +$793K |
|
2672
PUT
PVH
PVH
$3.71B
| $1.43M | ﹤0.01% |
17,100
+6,100
| +55% | +$479K |
|
2673
CALL
Bumble
BMBL
$367M
| $1.43M | ﹤0.01% |
235,000
+31,600
| +16% | +$216K |
|
2674
PUT
NexGen Energy
NXE
$6.05B
| $1.43M | ﹤0.01% |
159,900
+54,500
| +52% | +$402K |
|
2675
PUT
Prospect Capital
PSEC
$1.06B
| $1.43M | ﹤0.01% |
520,200
+422,500
| +432% | +$1.26M |
|
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.