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 | |
|---|---|---|---|---|---|---|
2726
Western Union
WU
$2.57B
| $1.36M | ﹤0.01% |
170,641
+110,509
| +184% | +$924K |
|
2727
Ondas Inc
ONDS
$4.44B
| $1.36M | ﹤0.01% |
176,437
-208,332
| -54% | -$864K |
|
2728
PUT
DigitalOcean
DOCN
$14.4B
| $1.36M | ﹤0.01% |
39,800
-146,600
| -79% | -$4.65M |
|
2729
CALL
Simplify US Equity PLUS Convexity ETF
SPYC
$109M
| $1.36M | ﹤0.01% |
74,200
-87,500
| -54% | -$3.64M |
|
2730
Coca-Cola
KO
$354B
| $1.36M | ﹤0.01% |
20,473
-79,322
| -79% | -$5.46M |
|
2731
CALL
Liberty Energy
LBRT
$2.83B
| $1.36M | ﹤0.01% |
109,900
+11,100
| +11% | +$128K |
|
2732
CALL
Aon
AON
$77.3B
| $1.35M | ﹤0.01% |
3,800
+100
| +3% | +$36.2K |
|
2733
CALL
GrafTech
EAF
$194M
| $1.35M | ﹤0.01% |
105,700
+97,430
| +1,178% | +$1.13M |
|
2734
CALL
Green Dot
GDOT
$753M
| $1.35M | ﹤0.01% |
100,900
+98,800
| +4,705% | +$1.22M |
|
|
FFAI
2735
CALL
Faraday Future Intelligent Electric
FFAI
$15.8M
| $1.35M | ﹤0.01% |
6,951
+5,649
| +434% | +$1.79M |
|
|
DCH
2736
CALL
Dauch Corp
DCH
$1.3B
| $1.35M | ﹤0.01% |
225,400
+132,800
| +143% | +$711K |
|
2737
CALL
Polaris
PII
$4.15B
| $1.35M | ﹤0.01% |
23,300
-6,300
| -21% | -$340K |
|
2738
PUT
Replimune Group
REPL
$814M
| $1.35M | ﹤0.01% |
323,300
+227,900
| +239% | +$1.46M |
|
2739
CALL
Herc Holdings
HRI
$5.43B
| $1.35M | ﹤0.01% |
11,600
+10,800
| +1,350% | +$1.39M |
|
2740
Rayonier
RYN
$6.49B
| $1.35M | ﹤0.01% |
+53,448
| New | +$1.28M |
|
2741
CALL
Eversource Energy
ES
$28.2B
| $1.35M | ﹤0.01% |
19,000
+12,400
| +188% | +$813K |
|
2742
PUT
Modine Manufacturing
MOD
$12.8B
| $1.35M | ﹤0.01% |
9,500
+5,200
| +121% | +$662K |
|
2743
CALL
Mettler-Toledo International
MTD
$26.8B
| $1.35M | ﹤0.01% |
1,100
+600
| +120% | +$752K |
|
2744
HF Sinclair
DINO
$15.9B
| $1.35M | ﹤0.01% |
25,772
+24,536
| +1,985% | +$1.16M |
|
2745
PUT
iHeartMedia
IHRT
$535M
| $1.35M | ﹤0.01% |
469,800
+100
| +0% | +$221 |
|
2746
Navitas Semiconductor
NVTS
$2.66B
| $1.34M | ﹤0.01% |
185,933
+152,463
| +456% | +$1.02M |
|
2747
CALL
Idexx Laboratories
IDXX
$42.9B
| $1.34M | ﹤0.01% |
2,100
-2,300
| -52% | -$1.4M |
|
2748
TTM Technologies
TTMI
$13.6B
| $1.34M | ﹤0.01% |
23,267
+19,940
| +599% | +$927K |
|
2749
CALL
Leonardo DRS
DRS
$12.8B
| $1.34M | ﹤0.01% |
29,500
-14,100
| -32% | -$614K |
|
2750
CALL
TE Connectivity
TEL
$58.8B
| $1.34M | ﹤0.01% |
6,100
-900
| -13% | -$180K |
|
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.