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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
276
CALL
AbbVie
ABBV
$518B
| $42M | 0.02% |
160,500
+36,100
| +29% | +$9.25M |
2014 Q4
47 quarters
|
|
277
PUT
TeraWulf
WULF
$6.22B
| $41.6M | 0.02% |
2,811,900
+578,700
| +26% | +$10.1M |
2023 Q1
14 quarters
|
|
278
PUT
Rocket Lab Corp
RKLB
$38.9B
| $41.6M | 0.02% |
596,900
+122,000
| +26% | +$8.79M |
2021 Q4
19 quarters
|
|
279
CALL
Starbucks
SBUX
$125B
| $41.6M | 0.02% |
442,300
+45,200
| +11% | +$4.66M |
2014 Q4
47 quarters
|
|
280
PUT
Invesco Aerospace & Defense ETF
PPA
$7.6B
| $41.4M | 0.02% |
200,600
-12,900
| -6% | -$2.21M |
2026 Q1
2 quarters
|
|
281
PUT
Comfort Systems
FIX
$38.8B
| $41.2M | 0.02% |
24,900
+5,600
| +29% | +$9.4M |
2023 Q4
11 quarters
|
|
282
CALL
Direxion Daily META Bear 1X ETF
METD
$8.21M
| $41.1M | 0.02% |
1,227,700
+882,600
| +256% | +$13.7M |
2024 Q2
9 quarters
|
|
283
PUT
Johnson & Johnson
JNJ
$675B
| $41M | 0.02% |
155,000
-22,400
| -13% | -$5.91M |
2014 Q4
47 quarters
|
|
284
CALL
Datadog
DDOG
$64.2B
| $40.8M | 0.02% |
149,000
-27,400
| -16% | -$6.78M |
2019 Q4
27 quarters
|
|
285
PUT
NextEra Energy
NEE
$181B
| $40.8M | 0.02% |
538,100
-32,200
| -6% | -$2.72M |
2014 Q4
47 quarters
|
|
286
CALL
Unity
U
$22.1B
| $40.7M | 0.02% |
993,200
+373,600
| +60% | +$14.4M |
2020 Q3
24 quarters
|
|
287
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$169M
| $40.4M | 0.02% |
2,340,900
+389,300
| +20% | +$15.8M |
2019 Q4
27 quarters
|
|
288
CALL
Celestica
CLS
$28.3B
| $40.3M | 0.02% |
111,500
+51,000
| +84% | +$16.9M |
2022 Q4
15 quarters
|
|
289
PUT
Shopify
SHOP
$187B
| $40.2M | 0.02% |
271,100
-21,300
| -7% | -$2.89M |
2015 Q4
43 quarters
|
|
290
PUT
Nokia
NOK
$46.7B
| $40M | 0.02% |
3,946,300
+1,667,700
| +73% | +$17.3M |
2015 Q2
45 quarters
|
|
291
PUT
Cloudflare
NET
$110B
| $40M | 0.02% |
115,200
-27,700
| -19% | -$8.21M |
2021 Q1
22 quarters
|
|
292
PUT
3M
MMM
$97.8B
| $39.4M | 0.02% |
240,000
-11,300
| -4% | -$1.93M |
2021 Q2
21 quarters
|
|
293
CALL
United States Brent Oil Fund
BNO
$725M
| $39.3M | 0.02% |
654,000
-116,300
| -15% | -$6.07M |
2017 Q4
35 quarters
|
|
294
PUT
D-Wave Quantum Inc
QBTS
$3.9B
| $39M | 0.02% |
2,353,600
+1,048,500
| +80% | +$19.4M |
2022 Q3
16 quarters
|
|
295
CALL
Thermo Fisher Scientific
TMO
$265B
| $38.7M | 0.02% |
57,400
+22,400
| +64% | +$13.3M |
2026 Q1
2 quarters
|
|
|
296
CALL
Invesco Aerospace & Defense ETF
PPA
$7.6B
| $38.5M | 0.02% |
197,100
+60,300
| +44% | +$10.3M |
2026 Q1
2 quarters
|
|
297
CALL
Centene
CNC
$34.3B
| $38M | 0.02% |
612,100
-40,200
| -6% | -$2.62M |
2021 Q1
22 quarters
|
|
298
CALL
GE Aerospace
GE
$350B
| $38M | 0.02% |
121,700
+64,500
| +113% | +$22.3M |
2014 Q4
47 quarters
|
|
299
ASML
ASML
$581B
| $37.7M | 0.02% |
20,828
+4,422
| +27% | +$7.67M |
2026 Q1
2 quarters
|
|
300
CALL
State Street SPDR Portfolio Short Term Treasury Index ETF
SPTS
$7.37B
| $37.6M | 0.02% |
225,400
-65,000
| -22% | -$1.88M |
2018 Q4
31 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.